Articullichirus collaroy ( Poore and Griffin, 1979 ) Poore & Dworschak & Schnabel, 2022

Poore, Gary C. B., Dworschak, Peter C. & Schnabel, Kareen E., 2022, Articullichirus, a new genus of ghost shrimp (Crustacea: Axiidea: Callichiridae) with one new species, Memoirs of Museum Victoria 81, pp. 123-133 : 130-132

Articullichirus collaroy ( Poore and Griffin, 1979) comb. nov.

Figure 5

Callianassa collaroy Poore and Griffin, 1979: 260–263 , figs 24, 25. Glypturus collaroy .— Sakai, 1988: 61.— Sakai, 2011: 434 (part). Corallianassa collaroy .— Tudge et al., 2000:144.— Davie,2002:460. Neocallichirus collaroy .— Sakai, 1999: 98. Corallianassa sp. MoV 4965.— Poore et al., 2008: 95, colour figure. Not Glypturus collaroy . — Sakai, 2005: 139–141, fig. 29? =

Articullichirus chiltoni sp. nov. Not Corallianassa collaroy .— Sakai, 1992: 212, fig. 1 =

Articullichirus articulatus .

Material examined. Australia, Western Australia, Great Australian Bight, 110 nm (204 km) SW of Eucla, 33° 20'S, 127° 45'E, 260 m, SAM C17888 (female, 9.3 mm). Off Bald Island , 35.19°S, 118.649°E, 161–169 m (stn SS10/2005/038), NMV J55438 (female, 13.2 mm). Off Two Rocks, 31.7244°S, 115.244°E, 102 m, NMV J53458 (male, 10.5 mm)

Diagnosis. Maxilliped 3 basis with mesial spine; merus with tooth on distal margin. Pereopod 1 coxa with mesiodistal hook. Uropodal endopod midlength about 1.2 times as long as wide, with semicircular apex, with 5 dorsal clusters of setae in distal half, with 2 proximal dorsal teeth. Telson 1.3 times as wide as long, with excavate posterior margin; with transverse dorsal row of 5 pairs of spiniform setae.

Supplementary description. Carapace length 0.27 of total length; cervical groove at 0.9 length of carapace; dorsal oval well defined; hepatic region with weakly sclerified line between dorsal oval and linea thalassinica. Rostrum and anterolateral carapace spines with unsclerified basal region; rostrum an anteriorly directed, acute spine longer than eyestalk; anterolateral spines set slightly back from rostrum, acute, half as long as rostrum. Anterolateral branchiostegal lobe well defined, margin extending dorsal to linea thalassinica, with sclerified plate below linea thalassinica. Pleomere 1 without transverse groove, with dorsolateral longitudinal setal row followed by cluster of simple setae; pleomere 2 1.8 times as long as pleomere 1 tergite; pleomeres 3–5 scarcely expanded laterally with dense setose areas; pleomere 6 1.3 times as long as pleomere 5, with posterolateral notch.

Eyestalk without produced mesiodistal apex; cornea swollen, distal. Antenna with acute scaphocerite. Antennular peduncle reaching almost to end of antennal peduncle article 5. Antennal peduncle with acute scaphocerite. Maxilliped 3 basis with recurved mesial hook; merus with prominent tooth on free distal margin.

Pereopods 1 coxae each with strong mesial hook. Major pereopod 1 (cheliped) ischium lower margin spinose; merus lower margin with 3 proximal spines, upper margin strongly convex; carpus with tooth at end on upper and lower margins; propodus upper margin rounded, with submarginal carina on mesial face, about as long as greatest width, distomesial edge straight; fixed finger 0.8 times upper margin, cutting edge with small tooth; dactylus as long as fixed finger, cutting edge with triangular tooth.

Minor pereopod 1 (cheliped) 0.8 times length of major; ischium lower margin spinose; merus lower margin with 2 proximal spines; carpus as long as wide; propodus upper margin as long as greatest width; fixed finger 1.3 times upper margin, cutting edge smooth; dactylus as long as fixed finger, cutting edge smooth.

Male pleopod 1 biarticulate; article 2 with small distolateral triangular lobe. Male pleopod 2 biramous; endopod with obsolete distomesial appendix; exopod longer than endopod. Uropod endopod 1.6 times as long as wide, with distal marginal setae, upper face with 5 clusters of setae over distal half, with 2 proximal teeth. Exopod about as wide as anterior margin, with proximal tooth on dorsal face, dorsal plate oblique, well separate from distal margin, setose, posterodistal angle rounded, densely setose.

Telson 1.3 times as wide as long, lateral margins strongly convex, posterior margin concave; with 5 pairs of dorsal spiniform setae in transverse row, finer setae mesially.

Size. Cl. to 13 mm.

Type locality. Australia, New South Wales, Long Reef, Collaroy .

Distribution. Temperate Australia (from off Sydney to off Perth); intertidal– 260 m.

Remarks. Poore and Griffin’s (1979) figures did not show the acute scaphocerite or spiniform setae on the telson that characterise this new genus. This is remedied here.

Sakai’s uses of the species name are in error. His “ Glypturus collaroy ” from New Zealand ( Sakai, 2005) has an upturned rostrum, not typical of the genus, but could otherwise be synonymous with A. chiltoni (see comments under that species above). His “ Corallianassa collaroy ” from French Polynesia ( Sakai, 1992) is A. articulatus .

The present identifications extend the distribution of this species from the intertidal of central NSW to deep water off southeastern WA, Australia.

Figures

Figure 5. Articullichirus collaroy (Poore and Griffin, 1979). Western Australia, NMV J53438 (male, 10.5 mm). a, carapace, eyestalks, pleon, telson, dorsal view; b, carapace, eyestalk, pleomere 1, lateral view; c, d, anterior carapace, eyestalk, antennular peduncle, antennal peduncle, lateral and dorsal views; e, pleomere 6, telson, dorsal view; f, right uropod, dorsal view; g, pereopodal coxae 1–4, thoracic sternite 7, ventral view; h, proximal articles of right cheliped and maxilliped 3 in situ, ventral oblique view; i, j, maxilliped 3, inner and outer views; k, major cheliped (left), mesial view; l, major cheliped fingers, lateral view; m, minor cheliped (right), mesial view; n, o, right pleopods 1, 2, posterior views. Scale bars = 1 mm. c1, coxa of right cheliped; cm, bm, im, coxa, basis, ischium of maxilliped 3. Scale bar = 1 mm.