Clorida seversi Moosa, 1973

Nakajima, Hiroki, Ueda, Tetsuya, Itani, Gyo & Osawa, Masayuki, 2024, The mantis shrimp genus Clorida Eydoux & Souleyet, 1842 (Crustacea: Stomatopoda: Squillidae) in Japan, with the first Japanese record of Cloridina ichneumon (Fabricius, 1798), Zootaxa 5463 (4), pp. 501-523 : 514

Clorida seversi Moosa, 1973

[New Japanese name: Minami-meboso-shako]

( Figs. 7 , 8 )

Clorida seversi Moosa, 1973: 22–24 , fig. 4 [type locality: north of Du Rowa Islands, north of Nuhu Rowa, Kai, Indonesia, 5°32'S, 132°41'E, 27–37 m].— Makarov 1979: 54, 55.— Ahyong 2001: 226–228, fig. 111.

Material examined. All specimens were collected using a yabby pump. RUMF-ZC-7447, 1 male (TL 35.6 mm, CL 6.1 mm), 1 female (TL 30.5 mm, CL 5.2 mm), southwest of Hatoma Island , adjacent to Iriomote Island, Ryukyu Islands, 24°27'59"N, 123°48'32"E, 18 m, sandy-muddy substate, coll. H. Nakajima, 14 Jun. 2022 . RUMF-ZC-7448, 1 male (TL 49.7 mm, CL 8.6 mm), same locality data as in RUMF-ZC-7447, coll. T. Sato. RUMF-ZC-7449, 1 female (TL 17.8 mm, CL 3.0 mm), Indabishi , Iriomote Island, 24°25'06"N, 123°50'09"E, 17.6 m, sandy bottom, coll. H. Nakajima, 12 Sep. 2022 .

Diagnosis. Carapace with anterolateral spines ( Fig. 7A ). A1 somite dorsal processes distally acute ( Fig. 7B ). Distal margin of second segment of A2 peduncle extending anteriorly beyond eyes ( Fig. 7A ). Mandibular palp absent. Raptorial claw dactylus with 4 well-formed teeth ( Fig. 7E ); extensor margin without basal notch. TS5 lateral process with short triangular lobe ( Fig. 7C, D ). AS 1–5 without SM carinae. Postanal carina present ( Fig. 7G ). Eye stalk with black band dorsolaterally ( Fig. 7A, B ). A2 scale not entirely black ( Fig. 7A ).

Colour in life. Body entirely beige, with scattered small black spots ( Fig. 8 ). TS6–8 and AS 1–6 posterior margins with ( Fig. 8C, D ) or without ( Fig. 8A ) narrow black lines. AS 1–5 with white patches marginally ( Fig. 8D ). Uropodal endopod with small black spots; posterior margin of proximal segment and mesial half of distal segment with dense black spots. Mature female ( Fig. 7C, D , RUMF-ZC-7447, TL 30.5 mm) with developed orange ovaries visible externally.

Remarks. Clorida seversi can be distinguished from the other congeners by the following characters (see Ahyong 2001): raptorial claw dactylus with four well-developed teeth ( Fig. 7E ); mandibular palp absent; lateral process of TS5 short, triangular lobe ( Fig. 7C, D ); and postanal carina present ( Fig. 7G ). Our specimens examined have all the diagnostic characters of C. seversi and there are no distinct differences from a re-description of the species by Ahyong (2001).

This is the first record of the species from Japanese waters. The largest male specimen examined (RUMF-ZC-7448, TL 49.7 mm), which also represents the largest specimen of C. seversi hitherto reported, is now designated as the standard specimen for the new Japanese name (Minami-meboso-shako) proposed here.

Distribution. Indonesia, Vietnam, northeastern Australia ( Ahyong 2001), and now Japan. In Japan, only known from Hatoma Island and Iriomte Island, Ryukyu Islands, southwestern Japan ( Fig. 11 ).

Ecological note. Soft substrates in coral reef lagoons, 9–15 m depth ( Ahyong 2001). The holotype was collected about 27–37 m depths (15–20 fathom; Moosa 1973). In this study, all the specimens were collected from fine sand and mud sediments covered by Halophila ovalis and ghost shrimp mounds in inner reefs, about 20 m depth ( Fig. 8E ). Makarov (1979) reported this species from 110 m depth in Vietnam.

Figures

FIGURE 7. Clorida seversi Moosa, 1973. RUMF-ZC-7448, male, TL 49.7 mm, Photographed after 1 year preservation in ethanol. A, anterior cephalothorax, dorsal view; B, same, right lateral view, A1 somite dorsal process (arrow); C, right TS5, posterolateral view, lateral lobe (arrow); D, right TS5–7, dorsal view; E, right raptorial claw, lateral view; F, AS6, uropod and telson, dorsal view; G, same, ventral view; H, same, right lateral view. Scale bars: 2 mm (A–D), 5 mm (E–H). Photograph credit: H. Nakajima.

FIGURE 8. Clorida seversi Moosa, 1973. A, B, RUMF-ZC-7448, male, TL 49.7 mm; C, D, RUMF-ZC-7447, female, TL 30.5 mm; E, collection habitat in Hatoma Island, southern Ryukyu Islands, depth about 15 m. A–C, photographed after anesthesia by clove oil; D, photographed while alive. Scale bars: 5 mm. Photograph credit: H. Nakajima.

FIGURE 11. Map showing the occurrences of five Clorida species and Cloridina ichneumon in Japan. Record of C. japonica at Nagasaki Prefecture, Kyushu Island (based on Komai 1927) is approximately plotted because of limited locality data.