Spinicallianassa spinicauda (Komai, Maenosono and Fujita, 2014)

Poore, Gary C. B., 2023, New records, one new genus and 21 new species of Callianassidae (Crustacea, Axiidea) from the Indo-West Pacific, Memoirs of Museum Victoria 82, pp. 167-255 : 246-250

Spinicallianassa spinicauda (Komai, Maenosono and Fujita, 2014)

Figures 1k , 54–56

Callianassa acutirostella .— Sakai, 2005: 64 (part), figs 13, 14.—

Sakai, 1999: 37 [not Callianassa acutirostella Sakai, 1988 ]. Cheramus spinicauda Komai et al., 2014: 505 , figs 1–8. Trypaea acutirostella .— Sakai, 2011: 390 (part.). Spinicallianassa aff. acutirostella .— Robles et al., 2020: figs 1, 3,

6, tables S1, S2.

Spinicallianassa spinicauda .— Poore et al., 2019: 140, 143.— Robles et al., 2020: table S2.—Dworschak, 2022: 253–255, fig. 2.

Material examined. Papua New Guinea, Madang Province, Riwo, 05° 09' S, 145° 48.2'E, 1–3 m ( PAPUA NIUIGINI stn PR195), MNHN IU-2013-7064 *# (female, 7.5 mm); MNHN IU-2013-7083 (female, 6.9 mm); MNHN IU-2013-7115 * (female, 4.0 mm). Kavieng Province (KAVIENG 2014 stations), Kavieng Lagoon, Nago I. Wharf, 02° 36.3' S, 150° 46.2'E, 3–12 m (stn KR06), MNHN IU-2016-8147 * (ovigerous female, 6.2 mm); MNHN IU-2014-1042 * (ovigerous female, 6.5 mm); MNHN IU-2013-8839 *# (female, 5.9 mm); MNHN IU-2013-8838 (= NMV J71763 )* (ovigerous female, 6.7 mm). Kavieng Harbour, 02° 34.7' S, 150° 47.5' E, 1–2 m (stn KZ16 ), MNHN IU-2014-2778 (ovigerous female, 5.4 mm) . Saudi Arabia. Red Sea, Farasan I., Tiger Head I., 16.79097° N, 42.19865° E, karstic shore, 1–10 m (stn SAFA-024), UF 36051 (ovigerous female, 5.5 mm). Gulf of Aqaba, Joey’s Shipwreck Bay , 28.184617° N, 34.638117° E, 3–10 m, seagrass (stn NORS-17B), UF 38165 (female, 4.7 mm) . Indonesia. Malaku Tengarra , MNHN IU-2016-8089 (ovigerous female, 6.2 mm). Pulku Maratua, E Kalimantan, MNHN IU-2016-8092 (female, 6.0 mm) .

Diagnosis. Telson 1.35 times as wide as long, with dorsal transverse row of long setae and 3 pairs of spiniform setae, anterolateral lobes rounded, lateral margins tapering to angular posterolateral corners; posterior margin almost truncate. Uropodal endopod 1.7 times as long as wide, with 4 or 5 scattered spiniform setae on face, without spiniform setae along anterodistal margin; anterior margin with or without subdistal tooth. Uropodal exopod 1.2 times as long as wide, distal margin at right angles to anterior margin, dorsal plate comprising numerous dense spiniform setae, anterior margin without distal spiniform seta. Maxilliped 3 ischium 1.0–1.2 times as long as wide; merus almost semicircular.

Variation. While most specimens from Papua New Guinea resemble Komai et al.’s (2014) figures, the chelipeds of some differ. The carpus of the major cheliped is shorter, the palm more swollen, and the dactylus with a basal molar in some (cf. figs 56a, b with 56l, m). The short distolateral carina on the upper margin of the minor cheliped is more exaggerated in some than others (cf. figs 56d, 56o). Komai et al. (2014) did not observe this carina.

Colour. Carapace and pleon essentially translucent/white; very pale orange over anterior carapace. Chelipeds carpi, palms and dactyli with pale reddish-orange dots on mesial and lateral faces (fig. 54). See too Komai et al. (2014: fig. 8).

Distribution. Eastern Coral Triangle, Red Sea and Gulf of Aden ( Japan, Okinawa [type locality], Philippines, Papua New Guinea, Saudi Arabia); 1– 12 m.

Remarks. Six specimens in the molecular phylogram ( Robles et al., 2020) came from Papua New Guinea (listed above) with one ( NHMW 25368*) from Palawan, Philippines. Dworschak (2022) confirmed the latter and others from the Philippines, Japan, and the Red Sea as S. spinicauda . The ovigerous female collected in the Arafura Sea by the Galathea expedition, reported and illustrated by Sakai (2005) as C. acutirostella is more likely to be S. spinicauda . About one quarter of an Australian Museum collection of about 40 callianassids from the Arafura Sea were incomplete or damaged and could not be reliably identified – none appeared to belong to the same species as the Galathea specimen.

While close to S. acutirostella , S. spinicauda differs in having a broader uropodal rami, the endopod with several small facial spiniform setae (two only in S. acutirostella ) and the maxilliped 3 merus twice as wide as long (1.5 times in S. acutirostella ). The two females from Saudi Arabia in this collection could not be distinguished from the many specimens from Papua New Guinea, consistent with the view of Dworschak (2022). Only females have been collected.

Figures

Figure 1. Dactylus of maxilliped 3 of representatives of two callianassoid families. Eucalliacidae. a, Calliaxina kensleyi (Dworschak, 2005), MNHN IU-2016-8084. Callianassidae. b, Caviallianassa moorea sp. nov., UF 28875; c, Paratrypaea sp, MNHN IU-2013-7035; d, Praedatrypaea lobetobensis sp. nov., MNHN IU-2015-109; e, Praedatrypaea orientalis (Bate, 1888), AM P.74473; f, Rayllianassa amboinensis (De Man, 1888), UF 8700; g, Rayllianassa bifida sp. nov., MNHN IU-2013-7137; h, Rudisullianassa pandan sp. nov., MNHN IU-2013-7063; i, Rudisullianassa rudisulcus Komai, Fujita and Maenosono, 2014, MNHN IU-2013-7121; j, Scallasis amboinae Bate, 1888, MNHN IU-2013-12303; k, Spinicallianassa spinicauda (Komai, Maenosono and Fujita, 2014), MNHN IU-2014-2778; l, Spinicallianassa papetoai sp. nov., UF 29280.

Figure 54. Spinicallianassa spinicauda (Komai, Maenosono and Fujita, 2014). Papua New Guinea. MNHN IU-2014-1042, ovigerous female, 6.5 mm (colour photographs by Zdeněk Ďuriš).

Figure 55. Spinicallianassa spinicauda (Komai, Maenosono and Fujita, 2014). Papua New Guinea. MNHN IU-2013-7064, female, 7.5 mm: a, eyestalks, carapace, pleon, telson, uropod; b, eyestalk, carapace, pleomere 1 (lateral); c, d, anterior carapace, eyestalk, antennular, antennal peduncles (lateral, dorsal); e, f, eyestalks (dorsal, lateral); g, h, scaphocerite (dorsal, lateral); i, pleomere 6, telson, right uropod; j, k, maxilliped 3 (inner, outer); l, maxilliped 3 dactylus. MNHN IU-2013-7083, female, 6.9 mm: m, telson, uropod. Saudi Arabia, UF 36051, ovigerous female, 5.5 mm: n, eyestalks (dorsal); o, telson, uropodal endopod. Scale bars = 1 mm.

Figure 56. Spinicallianassa spinicauda (Komai, Maenosono and Fujita, 2014). Papua New Guinea. MNHN IU-2013-7064, female, 7.5 mm: a, major cheliped (left, mesial); b, major cheliped, distal palm, fingers (lateral); c, minor cheliped (right, mesial); d, minor cheliped, distal palm, fingers (lateral); e–h, pereopods 2–5; i–k, pleopods 1–3. MNHN IU-2013-7083, female, 6.9 mm: l, major cheliped (right, mesial); m, major cheliped, distal palm, fingers (lateral); n, minor cheliped (left, mesial); o, minor cheliped, distal palm, fingers (lateral). Indonesia. MNHN IU- 2016-8089, female, 6.0 mm: p, major cheliped (left, mesial); q, major cheliped, fingers (lateral). Scale bars = 1 mm.