taxonID	type	description	language	source
03FF8785FFC98A2C57315D8EFB61FCBE.taxon	description	(Fig. 1)	en	Mizutani, Yoshiaki, Yanagisawa, Satoshi, Ichikawa, Mizuki, Nishio, Keisuke, Sakai, Hiroya, Nonokawa, Daishi, Makino, Yuichiro, Suzuki, Hitomi, Ichimiya, Hitoshi, Uchida, Yasuhiro, Watanabe, Junji, Kanashiro, Masaaki, Iwawaki, Tomoya, Kondo, Shun, Shibata, Rei, Inden, Yasuya, Murohara, Toyoaki (2025): Some Subtidal Crabs (Crustacea, Decapoda, Brachyura) from Suruga Bay, Pacific Coast of Central Japan. Bulletin of the National Museum of Nature and Science. Series A, Zoology 51 (1): 7-23, DOI: 10.50826/bnmnszool.51.1_7, URL: http://dx.doi.org/10.1111/jce.70074
03FF8785FFC98A2C57315D8EFB61FCBE.taxon	materials_examined	Material examined. ɹOse-zaki, Suguga Bay, 9.5 m depth, 1 8 (cb 21.6 mm, cl 22.7 mm), NSMT-Cr 32421, 2 - IX- 2023, coll. H. Takakura. Remarks. ɹGalil (2003) strictly restricted the lobate corner (Fig. 1 A, C), the granulated floor of the thoracic sinus (Fig. 1 B), the thoracic sinus beaded with granules and anteriorly defined by rectangular margin of the pterygostomian region (Fig. 1 B), and the dorsally carinate ambulatory carpi (Fig. 1 A) clearly show that the present specimen belongs to L. rubripalma. The dorsal and lateral views of a female from Okinawa-jima Island, Ryukyus, were given by Maenosono (2021 b) who mentioned that Leucosia perlata De Haan, 1841 reported from Ose-zaki, Suruga Bay, by Minemizu (2000) should be really referred to L. rubripalma. Distribution. Noumea and St. Vincent Bay, New Caledonia (12 – 30 m); Amboina, Indonesia; Papua New Guinea (3 – 17 m); Singapore; Bohol, Philippines (0 – 2 m); Okinawa-jima Island, Ryukyu Islands, and Suruga Bay, Japan (2 – 10 m).	en	Mizutani, Yoshiaki, Yanagisawa, Satoshi, Ichikawa, Mizuki, Nishio, Keisuke, Sakai, Hiroya, Nonokawa, Daishi, Makino, Yuichiro, Suzuki, Hitomi, Ichimiya, Hitoshi, Uchida, Yasuhiro, Watanabe, Junji, Kanashiro, Masaaki, Iwawaki, Tomoya, Kondo, Shun, Shibata, Rei, Inden, Yasuya, Murohara, Toyoaki (2025): Some Subtidal Crabs (Crustacea, Decapoda, Brachyura) from Suruga Bay, Pacific Coast of Central Japan. Bulletin of the National Museum of Nature and Science. Series A, Zoology 51 (1): 7-23, DOI: 10.50826/bnmnszool.51.1_7, URL: http://dx.doi.org/10.1111/jce.70074
03FF8785FFCA8A2A56D25AD6FB64FAA2.taxon	description	(Fig. 2)	en	Mizutani, Yoshiaki, Yanagisawa, Satoshi, Ichikawa, Mizuki, Nishio, Keisuke, Sakai, Hiroya, Nonokawa, Daishi, Makino, Yuichiro, Suzuki, Hitomi, Ichimiya, Hitoshi, Uchida, Yasuhiro, Watanabe, Junji, Kanashiro, Masaaki, Iwawaki, Tomoya, Kondo, Shun, Shibata, Rei, Inden, Yasuya, Murohara, Toyoaki (2025): Some Subtidal Crabs (Crustacea, Decapoda, Brachyura) from Suruga Bay, Pacific Coast of Central Japan. Bulletin of the National Museum of Nature and Science. Series A, Zoology 51 (1): 7-23, DOI: 10.50826/bnmnszool.51.1_7, URL: http://dx.doi.org/10.1111/jce.70074
03FF8785FFCA8A2A56D25AD6FB64FAA2.taxon	materials_examined	Material examined. Ose-zaki, Suguga Bay, 7.5 m depth, 1 Ə (cb 64.2 mm, cl 42.1 mm), NSMT-Cr 32423, 7 - X- 2023, coll. H. Takakura. Remarks. The present male specimen from Suruga Bay has morphological characters typical for the genus Thalamita s. l. as follows: the flattened carapace dorsal surface covered thickly with short setae (Fig. 2 E), the six lobed, subtruncated carapace frontal margin (Fig. 2 A), the remarkably developed inner lobe of the supraorbital margin (Fig. 2 B), the five strong carapace anterolateral teeth each tipped with a horny spine (Fig. 2 B), the fourth anterolateral tooth distinctly smaller than the others (Fig. 2 B), and the concave carapace posterolateral margin retreating rapidly towards the carapace posterior margin (Fig. 2 E). The specimen examined is identified as T. cerasma by having the following characters used in the key prepared to the species of the genus Thalamita of Wee and Ng (1995): 1) frontal border cut into more than two lobes excluding inner supraorbital lobes, 2) frontal border cut into six teeth excluding inner supraorbital lobes, 3) anterolateral border cut into five teeth, last not the smallest; frontal and mesogastric ridges present, 4) basal antennal segment with several sharp spines. Thalamita cerasma is placed close to T. spinimana Dana, 1852, T. prymna (Herbst, 1803) and T. pelsarti Montgomery, 1931, but the morphological differences among these species are distinct and the details are referred to the accounts given by Wee and Ng (1995). The characters of the frontal lobes, carapace anterolateral teeth, basal antennal segment and male pleon agree well with the line drawings of T. cerasma in the original description and the additional notes by Takeda and Marumura (1997). Some minor differences are present in the present specimen, including the stronger carapace dorsal ridges, the granulated outer and inner surfaces of the cheliped palm, and the slightly flared distal part of the male first gonopod, which is considered to be not interspecific, but intraspecific vari- ations.	en	Mizutani, Yoshiaki, Yanagisawa, Satoshi, Ichikawa, Mizuki, Nishio, Keisuke, Sakai, Hiroya, Nonokawa, Daishi, Makino, Yuichiro, Suzuki, Hitomi, Ichimiya, Hitoshi, Uchida, Yasuhiro, Watanabe, Junji, Kanashiro, Masaaki, Iwawaki, Tomoya, Kondo, Shun, Shibata, Rei, Inden, Yasuya, Murohara, Toyoaki (2025): Some Subtidal Crabs (Crustacea, Decapoda, Brachyura) from Suruga Bay, Pacific Coast of Central Japan. Bulletin of the National Museum of Nature and Science. Series A, Zoology 51 (1): 7-23, DOI: 10.50826/bnmnszool.51.1_7, URL: http://dx.doi.org/10.1111/jce.70074
03FF8785FFCA8A2A56D25AD6FB64FAA2.taxon	distribution	Distribution. Pacific Ocean, 10 – 30 m. — French Polynesia; Singapore (type locality); Ryukyu Islands, off Kii Peninsula and Suruga Bay, Japan.	en	Mizutani, Yoshiaki, Yanagisawa, Satoshi, Ichikawa, Mizuki, Nishio, Keisuke, Sakai, Hiroya, Nonokawa, Daishi, Makino, Yuichiro, Suzuki, Hitomi, Ichimiya, Hitoshi, Uchida, Yasuhiro, Watanabe, Junji, Kanashiro, Masaaki, Iwawaki, Tomoya, Kondo, Shun, Shibata, Rei, Inden, Yasuya, Murohara, Toyoaki (2025): Some Subtidal Crabs (Crustacea, Decapoda, Brachyura) from Suruga Bay, Pacific Coast of Central Japan. Bulletin of the National Museum of Nature and Science. Series A, Zoology 51 (1): 7-23, DOI: 10.50826/bnmnszool.51.1_7, URL: http://dx.doi.org/10.1111/jce.70074
03FF8785FFCC8A2857315CC8FE94F942.taxon	description	(Fig. 3)	en	Mizutani, Yoshiaki, Yanagisawa, Satoshi, Ichikawa, Mizuki, Nishio, Keisuke, Sakai, Hiroya, Nonokawa, Daishi, Makino, Yuichiro, Suzuki, Hitomi, Ichimiya, Hitoshi, Uchida, Yasuhiro, Watanabe, Junji, Kanashiro, Masaaki, Iwawaki, Tomoya, Kondo, Shun, Shibata, Rei, Inden, Yasuya, Murohara, Toyoaki (2025): Some Subtidal Crabs (Crustacea, Decapoda, Brachyura) from Suruga Bay, Pacific Coast of Central Japan. Bulletin of the National Museum of Nature and Science. Series A, Zoology 51 (1): 7-23, DOI: 10.50826/bnmnszool.51.1_7, URL: http://dx.doi.org/10.1111/jce.70074
03FF8785FFCC8A2857315CC8FE94F942.taxon	materials_examined	Material examined. Ose-zaki, Suruga Bay, 6 m depth, 1 Ə (cb including epibranchial teeth of both sides, 41.5 mm, cl including frontal tooth, 18.1 mm), NSMT- 32426, 25 - XI- 2023, coll. H. Takakura. Remarks. Marumua and Kosaka (2003) recorded a female of Portunus (Hellenus) mariei from Kayama-jima Island, the Ryukyu Islands, without mention about the specimen itself and the distributional information in Japanese waters. In the present male specimen from Suruga Bay, both of the frontal lateral teeth of the carapace are broken off just like the holotype specimen (Fig. 3 A – B), but all the distinguishing characters agree well with the original description and additional notes and figures of this species by Crosnier (1962) and Crosnier and Thomassin (1974). The general shape of the carapace (Fig. 3 A) is typical for the Portunus s. l. species, but differen- tiated in having the remarkably long epibranchial spine and eight sharp anterolateral teeth including the external orbital tooth, and the protogastric, mesogastric, cardiac and intestinal regions each with two bosses arranged side by side. Of eight carapace anterolateral teeth, fourth and sixth teeth are apparently smaller than the others. Each lateral end of the carapace posterior margin is more or less lobate and rather angulated, but not tuberculated. The third maxilliped is as repre- sented in Fig. 3 B, with the merus outer part strongly produced forwards as an elongate lobe. The male pleon and first gonopod in situ are as in Fig. 3 C – D, respectively. In the male pleon (Fig. 3 C), the lateral margins of the penultimate pleonite are weakly concave at about distal one-third, and the telson is somewhat elongate and rounded along the distal margin. The male first gonopod (Fig. 3 D) is stout, strongly curved, and not so long. Distribution. Mayotte Island, Comoro Islands in the Mozambique Channel; Nosy Be, Madagascar (intertidal zone); Palau Islands; Kayama-jima Island, Ryukyu Islands, and Sugura Bay (6 m depth), Japan.	en	Mizutani, Yoshiaki, Yanagisawa, Satoshi, Ichikawa, Mizuki, Nishio, Keisuke, Sakai, Hiroya, Nonokawa, Daishi, Makino, Yuichiro, Suzuki, Hitomi, Ichimiya, Hitoshi, Uchida, Yasuhiro, Watanabe, Junji, Kanashiro, Masaaki, Iwawaki, Tomoya, Kondo, Shun, Shibata, Rei, Inden, Yasuya, Murohara, Toyoaki (2025): Some Subtidal Crabs (Crustacea, Decapoda, Brachyura) from Suruga Bay, Pacific Coast of Central Japan. Bulletin of the National Museum of Nature and Science. Series A, Zoology 51 (1): 7-23, DOI: 10.50826/bnmnszool.51.1_7, URL: http://dx.doi.org/10.1111/jce.70074
03FF8785FFCE8A295707587CFD28F884.taxon	description	(Fig. 4)	en	Mizutani, Yoshiaki, Yanagisawa, Satoshi, Ichikawa, Mizuki, Nishio, Keisuke, Sakai, Hiroya, Nonokawa, Daishi, Makino, Yuichiro, Suzuki, Hitomi, Ichimiya, Hitoshi, Uchida, Yasuhiro, Watanabe, Junji, Kanashiro, Masaaki, Iwawaki, Tomoya, Kondo, Shun, Shibata, Rei, Inden, Yasuya, Murohara, Toyoaki (2025): Some Subtidal Crabs (Crustacea, Decapoda, Brachyura) from Suruga Bay, Pacific Coast of Central Japan. Bulletin of the National Museum of Nature and Science. Series A, Zoology 51 (1): 7-23, DOI: 10.50826/bnmnszool.51.1_7, URL: http://dx.doi.org/10.1111/jce.70074
03FF8785FFCE8A295707587CFD28F884.taxon	materials_examined	Material examined. ɹOse-zaki, Suruga Bay, 6 m depth, 1 ovig. 8 (cb 15.2 mm, cl 10.6 mm), NSMT-Cr 32417, 24 - VI- 2023, coll. H. Takakura; Ose-zaki, 5 m depth, 1 Ə (cb 18.0 mm, cl 12.3 mm), NSMT-Cr 32418, 11 - V- 2024, coll. H. Takakura. Remarks. ɹIn Japan, this species has been known as Chlorodopsis granulata Stimpson by Sakai (1936, 1939) or Pilodius granulatus (Stimpson) by Sakai (1965, 1976), but the Japanese species are known as P. miersi Ward since the revision of the genus Pilodius by Clark and Galil (1993), which is through, with many photographs and detailed line drawings of the distinguishing characters, and made clear the synonymy of 12 known and 3 new species. However, on the results of analyses of mitochondrial and nuclear gene sequences, Lasley et al. (2015) concluded that the genus Pilodius is restricted to 10 species and that the others are transferred to the genera Cyclodius Dana, 1851, and Soliella and Luniella erected by Lasley et al. (2015). Pilodius miersi is one of 10 constituent species of the genus Pilodius. carapace dorsal surface are distinctly isolated by deep furrows and wholly covered with short setae and sharp granules; the protogastric region is not perfectly divided into two by a longitudinal furrow, leaving the posterior part undivided, and the subdivision of the mesogastric region is not clear. The carapace anterolateral margin is cut into four teeth, each of which is armed with a main spine and some accessory spinules. In the male cheliped (Fig. 4 A – B), the palm is covered and encircled with blackish color extended from the immovable finger. The close congener, Pilodius nigrocrinitus Stimpson, 1858, is different from this species primarily by having the carapace covered with black setae instead of brownish setae in this species and having no blackish color extended onto the palm of the male cheliped. The male first gonopod of the present specimen agrees well with the figures given by Clark and Galil (1993, fig. 7), in having the distal part with a thick fringe of longish stout setae. Distribution. ɹWest Pacific, from Japan and Korea to the Queensland coast of Australia through the Philippines and the South China Sea, with a distributional map by Clark and Galil (1993, fig. 22). Following the key to the Pilodius species provided by Clark and Galil (1993), P. miersi is distinguished from the congeners by the combination of the following characters of the carapace: 1) the protogastric region is divided into two longitudinally, 2) the mesogastric region is tripartite, and 3) the anterior lobe of the mesogastric region surpassing anterior margin of the protogastric region. The specimens examined are briefly noted in the following lines. The carapace (Fig. 4 A, C) is transversely ovate, but proportionally wider in the male than the female. The regions of the	en	Mizutani, Yoshiaki, Yanagisawa, Satoshi, Ichikawa, Mizuki, Nishio, Keisuke, Sakai, Hiroya, Nonokawa, Daishi, Makino, Yuichiro, Suzuki, Hitomi, Ichimiya, Hitoshi, Uchida, Yasuhiro, Watanabe, Junji, Kanashiro, Masaaki, Iwawaki, Tomoya, Kondo, Shun, Shibata, Rei, Inden, Yasuya, Murohara, Toyoaki (2025): Some Subtidal Crabs (Crustacea, Decapoda, Brachyura) from Suruga Bay, Pacific Coast of Central Japan. Bulletin of the National Museum of Nature and Science. Series A, Zoology 51 (1): 7-23, DOI: 10.50826/bnmnszool.51.1_7, URL: http://dx.doi.org/10.1111/jce.70074
03FF8785FFCF8A27573E5DB8FCB2FB8F.taxon	description	(Figs. 5 – 7)	en	Mizutani, Yoshiaki, Yanagisawa, Satoshi, Ichikawa, Mizuki, Nishio, Keisuke, Sakai, Hiroya, Nonokawa, Daishi, Makino, Yuichiro, Suzuki, Hitomi, Ichimiya, Hitoshi, Uchida, Yasuhiro, Watanabe, Junji, Kanashiro, Masaaki, Iwawaki, Tomoya, Kondo, Shun, Shibata, Rei, Inden, Yasuya, Murohara, Toyoaki (2025): Some Subtidal Crabs (Crustacea, Decapoda, Brachyura) from Suruga Bay, Pacific Coast of Central Japan. Bulletin of the National Museum of Nature and Science. Series A, Zoology 51 (1): 7-23, DOI: 10.50826/bnmnszool.51.1_7, URL: http://dx.doi.org/10.1111/jce.70074
03FF8785FFCF8A27573E5DB8FCB2FB8F.taxon	materials_examined	Material examined. ɹOse-zaki, Suruga Bay, 6 m depth, 1 Ə (cb 9.3 mm, cl 7.5 mm), NSMT-Cr 32415, 24 - VI- 2023, coll. H. Takakura; 4.5 m depth, 1 Ə (cb 9.3 mm, cl 7.2 mm), NSMT-Cr 32416, 29 - VII- 2023, coll. H. Takakura; 4.5 m depth, 1 Ə (cb 10.8 mm, cl 8.5 mm), NSMT-Cr 32717, 15 - VI- 2024, coll. H. Takakura. Remarks. ɹThree males examined agree well with the notes on Actumnus elegans (De Man, 1887) by Takeda and Miyake (1969 a) in which two males and one female from Kyushu, Japan were recorded hesitantly. Takeda and Miyake (1969 a) wrote that, in their specimens, the carapace anterolateral margin is rather distinctly cut into four teeth and each tooth is bordered with four or five granules, one or two of which are more prominent than the others. In the present specimens, the four teeth of the carapace anterolateral margin may be better noted as lobate teeth, but each tooth marginally armed with some granules of different sizes is the same form with that of the specimens from Kyushu. The original description (De Man, 1887) noted that A. elegans is distinguished at first sight from A. obesus Dana, 1852, by the carapace anterolateral margin being armed with six acute spiniform granules, behind the acute granuliform external angle, arranged in three groups, two together. According to Alcock (1898), the anterolateral margin is armed with seven acute spinuliform granules, in three pairs, with an odd one between the first pair and the orbital angle. Alcock (1898) left the comments that A. elegans seems to be better placed in Pilumnus rather than Actumnus, because it might be close to P. scabriusculus Adams and White, 1849. Chopra and Das (1937) and Takeda and Miyake (1969 a) followed the precedent literature as for the generic affiliation to the genus Actumnus. In the present specimens, the carapace is rather narrow, with 1.24 (NSMT-Cr 32415), 1.29 (NSMT-Cr 32416) and 1.27 (NSMT-Cr 32717) in the ratio of cb to cl, and strongly convex anteriorly and rather concave in the posterolateral dorsal surface, showing the close affinity to Actumnus. The carapace dorsal surface is ill-defined and covered thickly and uniformly with yellowish stiff hairs mixed with scant longish, clubshaped soft hairs for the most part, being possibly referred to the generic characters of both of Actumnus and Pilumnus (Figs. 5 – 7). The armature of the carapace anterolateral margin is, as mentioned above, shows its systematic position in Actumnus, because the Pilumnus species are characterized by the carapace anterolateral margin armed with stout triangular teeth in dorsal view, or with narrower, more or tubercular teeth each terminating in a horny tip, or with sharp spiniform teeth directed obliquely forwards. In Actumnus, the carapace is typically much narrower and higher, and the thoracic sternum is narrower, with the rather elongated male pleon. In the present specimens (Fig. 6 C), the male pleon is not remarkably narrow and somewhat like the Pilumnus - type rather than the Actumnus - type. Otherwise, in the present specimens, the carapace front (Fig. 7 B – D) is markedly developed forwards and obliquely downwards, and the inner half of the supraorbital margin is longitudinal in dorsal view, as specially mentioned by Takeda and Miyake (1969 a). In the present paper, the specimens examined are placed in the genus Actumnus and identified to A. elegans as the preceding studies. Distribution. Mergui Archipelago, Myanmar (Burma); Ariake Sea and Okino-shima Island in the west and north of Kyushu, and Suruga Bay, Japan.	en	Mizutani, Yoshiaki, Yanagisawa, Satoshi, Ichikawa, Mizuki, Nishio, Keisuke, Sakai, Hiroya, Nonokawa, Daishi, Makino, Yuichiro, Suzuki, Hitomi, Ichimiya, Hitoshi, Uchida, Yasuhiro, Watanabe, Junji, Kanashiro, Masaaki, Iwawaki, Tomoya, Kondo, Shun, Shibata, Rei, Inden, Yasuya, Murohara, Toyoaki (2025): Some Subtidal Crabs (Crustacea, Decapoda, Brachyura) from Suruga Bay, Pacific Coast of Central Japan. Bulletin of the National Museum of Nature and Science. Series A, Zoology 51 (1): 7-23, DOI: 10.50826/bnmnszool.51.1_7, URL: http://dx.doi.org/10.1111/jce.70074
03FF8785FFC18A2556CD5D2DFCBFFD0C.taxon	description	(Figs. 8 – 9)	en	Mizutani, Yoshiaki, Yanagisawa, Satoshi, Ichikawa, Mizuki, Nishio, Keisuke, Sakai, Hiroya, Nonokawa, Daishi, Makino, Yuichiro, Suzuki, Hitomi, Ichimiya, Hitoshi, Uchida, Yasuhiro, Watanabe, Junji, Kanashiro, Masaaki, Iwawaki, Tomoya, Kondo, Shun, Shibata, Rei, Inden, Yasuya, Murohara, Toyoaki (2025): Some Subtidal Crabs (Crustacea, Decapoda, Brachyura) from Suruga Bay, Pacific Coast of Central Japan. Bulletin of the National Museum of Nature and Science. Series A, Zoology 51 (1): 7-23, DOI: 10.50826/bnmnszool.51.1_7, URL: http://dx.doi.org/10.1111/jce.70074
03FF8785FFC18A2556CD5D2DFCBFFD0C.taxon	materials_examined	Material examined. ɹOse-zaki, Suguga Bay, 9 m depth, 1 8 (cb 6.3 mm, cl 4.9 mm), NSMT-Cr 32424, 4 - XI- 2023, coll. H. Takakura. Remarks. ɹ Zehntneriana is a replaced name of the genus Zehntneria Takeda, 1972, because it is a junior homonym of the same name for African orthopteran insect (cf. Ng and Takeda, 2010). The genus is at present composed of six species from the West Pacific, and five of them are known from Japanese waters — Z. amakusae (Takeda and Miyake, 1969), Z. miyakei (Takeda, 1972), Z. novaeinsulicola (Takeda and Miyake, 1977), Z. tadafumii Lee, Kim and Ng, 2015, and Z. serrta Ng and Lin, 2015. They were well studied by Maenosono (2019, 2021 a) based on the specimens from the Ryukyu Islands, with comments on Z. amakusae. The present female (Fig. 8) lacks both chelipeds and the right second to fourth ambulatory legs, but agrees quite well with Zehntneriana amakusae (Takeda and Miyake, 1969), which was described on an ovigerous female (holotype) and three males and three females (paratypes) from the Amakusa Islands, west of Kyushu. The original description and figures (Takeda and Miyake, 1969 b), and also the color photograph and line drawings (Lee et al., 2011) seem to be thorough for the identification, with several sub- sequent records from Japan and Korea. The female examined is characteristic in having the fur of short soft hairs along the frontal, orbital and anterolateral margins of the carapace. This character is obscurely seen in the present monochrome photograph (Fig. 8), but traceable as a shallow depression and comparable with the original figure (Fig. 9). The carapace anterolateral margin (Fig. 9) is typically cut into three low teeth, but as mentioned in the original description, the teeth are not always sharp just as in the present female. As realized from the key to Japanese species of the genus Zehntneriana by Maenosono (2019), this species is most close to Z. miyakei from the Palau and Ryukyu Islands, and also to Z. novaeinsulicola from the Nishino-shima Island in the Ogasawara Islands, some islands of the Ryukyu Islands, and Shiono-misaki at the Kii Peninsula, Pacific coast of central Honshu. However, Z. miyakei is characteristic in having the bare carapace without fur and the remarkably long first to third ambulatory legs, with the meri serrulated throughout the anterior margins, and Z. novaeinsulicola is characterized by the rather oval carapace bearing fur not defined clearly along the frontal, supraorbital and anterolateral margins of the carapace Distribution. ɹThe type locality is the Amakusa Islands, west of Kyushu, Japan, ca. 40 m depth. The geographical range is from Suruga Bay recorded in this paper to the south and west of Kyushu, Japan, and Jejudo Island, southern Korea. From intertidal zone to the depth of 100 m.	en	Mizutani, Yoshiaki, Yanagisawa, Satoshi, Ichikawa, Mizuki, Nishio, Keisuke, Sakai, Hiroya, Nonokawa, Daishi, Makino, Yuichiro, Suzuki, Hitomi, Ichimiya, Hitoshi, Uchida, Yasuhiro, Watanabe, Junji, Kanashiro, Masaaki, Iwawaki, Tomoya, Kondo, Shun, Shibata, Rei, Inden, Yasuya, Murohara, Toyoaki (2025): Some Subtidal Crabs (Crustacea, Decapoda, Brachyura) from Suruga Bay, Pacific Coast of Central Japan. Bulletin of the National Museum of Nature and Science. Series A, Zoology 51 (1): 7-23, DOI: 10.50826/bnmnszool.51.1_7, URL: http://dx.doi.org/10.1111/jce.70074
03FF8785FFC38A2356D45A7AFB73F942.taxon	description	(Figs. 10 – 12) Notonyx nitidus A. Milne-Edwards, 1873: Serène & Umali, 1972, p. 82, figs. 90 – 95, pl. 8 figs. 9 – 10. Notonyx sagittifer Ng & Clark, 2010, p. 31, figs. 1 – 3. Notonyx aff. sagittifer: Takeda, 2023, p. 28, fig. 11 C – E. Material examined. ɹOse-zaki, Suruga Bay, 6 m depth, 1 Ə infested by a sacculinid parasite (cb 14.9 mm, cl 11.0 mm), NSMT-Cr 32425, 4 - XI- 2023, coll. H. Takakura; Ose-zaki, 2 m depth, sandy mud bottom, 1 8 (cb 15.0 mm, cl 10.5 mm), NSMT-Cr 32447, 28 - IX- 2024, coll. H. Takakura. Remarks. ɹThe type species of the genus Notonyx, N. nitidus A. Milne-Edwards, 1873, was explained in detail based on the holotype from New Caledonia and the topographical and other specimens by Clark and Ng (2006). It is remarkable that ten of twelve known species were described during six years from 2006 to 2011. The known species are well described and figured, but the definite identification is rather difficult due to the small size, less than cb 15 mm, and the smooth carapace of closely similar shape. The present male infested by a sacculinid parasite has the short first and elongated other pleo- pods deformed with parasitism. The carapace, chelipeds and ambulatory legs are considered to show the original characteristics (Figs. 10 – 12), and the female is of nearly same size as the male, with undifferentiated shape from the male. The two specimens examined are relatively large (cb 14.9 and 15.0 mm) and comparable with the larger five species in the genus, N. rayneri Ng and Clark, 2010 (cb 17.3 mm), N. falcatus Rahayu, 2011 (cb 16 mm), N. guinotae Rahayu and Ng, 2010 (cb 15.5 mm), and N. kumi Naruse and Maenosono, 2009 (cb 13.0 mm). In the present specimens, however, the carapace (Figs. 10, 12 A) is rather narrow, 1.36 wider than long in male and 1.43 in female. Although the carapace form may vary individually or with photographing, the carapace anterolateral margin of these specimens is so as to be sub-rectangular, being different from these large species. Among the known smaller species, the carapace proportion of the present male just agrees with that of N. sagittifer, the holotype of which is the old specimen from Mindanao, previously recorded by Serène and Umali (1972) as N. nitidus A. Milne-Edwards, 1873 (Ng and Clark, 2010). The present male is apparently larger than the holotype of N. sagittifer (cb 8.74 mm), but it may be difficult to show the definite differences as regards the carapace shape and chela between the Philippine and Japanese specimens. In the present specimens examined, the frontal margin is almost straight, without median interruption (Fig. 11 B); the posterior margin of the epistome is divided into three parts, with the median part weakly convex and medially incised (Fig. 11 B); the male pleon is wide and triangular as a whole (fig. 11 C); and both chelae are compressed and strongly crested along the whole lower margins of the palm and immovable finger (Fig. 11 A, C). The male first gonopod is similar to the line drawings of that of the original description of N. sagittifer, but its tip is rather sharp and not so distinctly truncated as in the original figures, with more crowded tubercles at the subterminal part. The male second gonopod is so abnormally elongated like the female pleopod that its tip is not the form of arrow-head. The female pleon is wide and covers the whole sternum, with the widest fourth pleonite and the telson slightly longer than the preceding pleonites. Each vulva is large, transversely ovate, with the anterior margin more strongly convex than the posterior margin, and located just on the suture between the fifth and sixth thoracic ster- nites, each occupying one-third as wide as each sternite. Takeda (2023) recorded a small male (cb 5.0 mm) from the Palau Islands as Notonyx aff. sagittifer. In the specimen, unfortunately, the male pleon and first gonopod, and all the ambulatory legs are missing. The specimen was not positively identified to N. sagittifer, but may be not matured stage of that species, with fragile chelipeds. Color in life. ɹWholly chestnut-color and partly paler, as reproduced in Fig. 10. Distribution. ɹDefinitely known only from Tawi-Tawi, Mindanao, Philippines, and probably from the Palau Islands. New to Japanese waters.	en	Mizutani, Yoshiaki, Yanagisawa, Satoshi, Ichikawa, Mizuki, Nishio, Keisuke, Sakai, Hiroya, Nonokawa, Daishi, Makino, Yuichiro, Suzuki, Hitomi, Ichimiya, Hitoshi, Uchida, Yasuhiro, Watanabe, Junji, Kanashiro, Masaaki, Iwawaki, Tomoya, Kondo, Shun, Shibata, Rei, Inden, Yasuya, Murohara, Toyoaki (2025): Some Subtidal Crabs (Crustacea, Decapoda, Brachyura) from Suruga Bay, Pacific Coast of Central Japan. Bulletin of the National Museum of Nature and Science. Series A, Zoology 51 (1): 7-23, DOI: 10.50826/bnmnszool.51.1_7, URL: http://dx.doi.org/10.1111/jce.70074
