Spinicallianassa acutirostella ( Sakai, 1988 )

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 : 240

Spinicallianassa acutirostella ( Sakai, 1988)

Figure 49

Callianassa acutirostella Sakai, 1988: 57–59 , fig. 2.— Sakai,

1999: 37.— Tudge et al., 2000: 143.—Davie, 2002: 458. Trypaea acutirostella .— Sakai, 2011: 390. Cheramus acutirostella .—Komai et al., 2014b: 522, fig. 16. Spinicallianassa acutirostella .— Poore et al., 2019: 140, 143. Not Callianassa acutirostella .— Sakai, 2005: 64–68, figs 13, 14

(= Spinicallianassa spinicauda (Komai, Maenosono and Fujita, 2014) .

Material examined. Australia, WA, North West Shelf , 19° 05.1' S, 118° 53.7' E, 82 m, NTMAG Cr000789 (holotype female, 4.5 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.

Distribution. Northwest Australian Shelf ( Australia, WA [type locality: North West Shelf, 82 m]); 82 m.

Remarks. Callianassa acutirostella was described from a single female without pereopods, reillustrated here in part. The original description ( Sakai, 1988) illustrated (unconvincingly) the two pairs of prominent spiniform setae on the face and the row of about 16 short spiniform setae on each half of the posterior margin of the telson, figured in more detail from the holotype by Komai et al. (2014b) who transferred the species to Cheramus . The uropodal endopod has three long and one short spiniform setae on the anterodistal margin plus two long facial spiniform setae on the longitudinal ridge; the exopod has spiniform setae of various lengths on the posterodistal margin and the margin of the dorsal plate, plus a single facial spiniform seta. The scaphocerite is minute and triangular.

Figures

Figure 49. Spinicallianassa acutirostella (Sakai, 1988). Australia, North West Shelf. NTMAG Cr000789, holotype female, 4.5 mm: a, b, rostrum, antennal peduncle, eyestalk; c, pleomere 6, telson, uropod; d, right uropod. Scale bars = 1 mm.