Spinicallianassa papetoai, Poore, 2023

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 : 243-245

Spinicallianassa papetoai sp. nov.

http://zoobank.org/urn:lsid:zoobank.org:act:BF71A89C-426F-

4F45-B415-EEA6BA898246

Figures 1l , 51 , 52

Spinicallianassa FP-10.— Robles et al., 2020: figs 1, 3, 6.

Material examined. Holotype. French Polynesia, Moorea , Papetoai lagoon, 17.490867° S, 149.882879° E ( FMNH stn BIZ-109), UF 23875 (ovigerous female, 5.3 mm) . Paratypes. French Polynesia, Moorea (all FMNH stations: Papetoai, 17.489800° S, 149.884° W (stn BIZ-463), UF 28785 *# (ovigerous female, 4.5 mm), UF 28821 * (juvenile, 2.9 mm), UF 28822 * (ovigerous female, 4.200 mm); (stn BIZ-493), UF 28905 * (ovigerous female, 4.3 mm). Papetoai, 17.491100° S, 149.884400° W (stn MIB-195), UF 16285 (ovigerous female, 4.5 mm), UF 16299 (female, 4.9 mm). SW of Motus, 17.494° S, 149.921° W (stn BIZ-474), UF 28787 (female, 3.6 mm). Motu I. Channel, 17.489210° S, 149.913140° W (stn BIZ-676), UF 29277 (female, 5.1 mm). Haapiti, mangrove area, 17.556680° S, 149.874400° W (stn MIB-054), UF 15733 (ovigerous female, 5.7 mm). Motu Tiahura / Fareone channel, 17.488800° S, 149.913400° E, (stn MIB-226), UF 16508 (ovigerous female, 4.4 mm), UF 16509 (female, 5.2 mm) . Other material (all females, many ovigerous, not measured). French Polynesia, Moorea (all FMNH stations). Papetoai lagoon, 17.490867° S, 149.882879° W (stn BIZ-109), UF 23877 . Papetoai , 17.489800° S, 149.884° W (stn BIZ-463), ( UF 28786 / 2, UF 28823 . NW Motus , in channel between islands and beach, 17.488393° S, 149.913420° W (stn BIZ-148), UF 23947 . NW Motus , in channel between islands, 17.489335° S, 149.913178° W (stn BIZ-150), UF 23946 , UF 23955 . Nihimauru estuary, 17.533° S, 149.904050° W (stn BIZ-158), UF 23987 . Between Cook’s Bay and Hilton, off Pihaena, 17.481° S, 149.83° W (stn BIZ-632), UF 29192 , UF 29211 , UF 29212 , UF 29213 , UF 29214 . Ray feeding site near Motu islands 17.487680° S, 149.970° E, (stn BIZ-675), UF 29259 , UF 29260 , UF 29261 , UF 29263 , UF 29266 , UF 29268 #, UF 29269 , UF 29270 , UF 29271 . Motu I. Channel, 17.489210° S, 149.913140° W (stn BIZ-676), UF 29272 , UF 29275 , UF 29276 , UF 29280 . Motu Tiahura / Fareone channel, 17.4888° S, 149.9134° E, (stn MIB-226), UF 16510 , UF 16511 , UF 18419 .

Diagnosis. Telson 1.3 times as wide as long, with dorsal transverse row of long setae, anterolateral lobes rounded, lateral margins tapering to broadly rounded posterolateral corners; posterior margin convex with slight medial concavity. Uropodal endopod 1.6 times as long as wide, with 10–12 scattered spiniform setae on face, especially in diagonal subdistal row, with 4 spiniform setae along anterodistal margin; anterior margin with subdistal tooth. Uropodal exopod 1.25 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 about as long as wide; merus almost semicircular.

Description of holotype. Rostrum spine-like, situated at level of dorsal carapace, 0.65 length of eyestalk. Carapace dorsally weakly convex in lateral view, about as long as pleomeres 1–2 combined; orbital margin transverse, well differentiated from sidesofrostrum;anterolaterallobeinsignificant;subanterolateral margin convex, oblique; anterior margin of branchiostegite vertical below linea thalassinica, convex ventrally; cervical groove deeply incised, across 0.8 length of carapace, not reaching linea thalassinica. Pleomere 1 tergite with shallow transverse groove, much narrower anteriorly. Pleomere 2 1.3 times as long as pleomere 1. Pleomere 6 about as wide as long.

Eyestalk 0.75 as wide as long, with dorsal face strongly depressed anteriorly (basally about three quarters as high as wide), with sharp ventrolateral margin, lateral margin swollen proximal to and opposite cornea, anteromedial angle sharply angled laterally in dorsal view, overreaching distal margin of antennular peduncle article 1. Cornea densely pigmented, occupying mid-distal half of eyestalk.

Antennular peduncle little longer than antennal peduncle; article 1 not visible in dorsal view; article 3 about as long as articles 1 and 2 combined; article 2 with dense longitudinal ventral row of long setae; article 3 with well-spaced ventral setae. Antennal peduncle article 5 0.7 length of article 4; scaphocerite acute, curved.

Maxilliped 3 ischium dilating distally, as long as wide, crista dentata comprising about 20 small, unevenly spaced teeth; merus 0.5 length of ischium measured along outer margin, twice as wide as long, with mesiodistal margin convex, reaching beyond articulation of carpus; carpus 0.9 length of merus outer margin; propodus ovoid-tapering, 1.7 times as long as wide; dactylus tapering, 0.6 length of propodus, with scattered setae along upper margin, dense row of short setae along distal lower margin.

Pereopods 1 (chelipeds) unequal, dissimilar. Major cheliped carpus-palm upper margin 0.9 carapace length. Ischium expanding distally, upper margin almost straight, unarmed; lower margin with row of 10 similar oblique spines. Merus as long as ischium, 1.7 times as long as wide (tooth excluded), ovate; upper margin convex, unarmed; lower margin with oblique spine one third along, denticulate beyond. Carpus 0.85 as long as wide; upper margin carinate; lower margin carinate. Propodus upper margin 1.3 times as long as carpus; palm as long as wide; upper margin convex, carinate over entire length; lateral surface smooth, convex; distolateral margin of palm with convex lobe; mesial surface convex, distomesial margin transverse, set back from distolateral margin, with tubercle at lower limit; lower margin carinate, with row of setae extending onto fixed finger; fixed finger 0.75 length of palm, triangular; cutting edge lateral, microserrate over proximal half, steep step before distal concavity. Dactylus as long as fixed finger, curved, with acute tip; upper margin ridged, with dense tufts of long setae; lateral surface with few tufts of long setae along cutting edge; cutting edge unarmed.

Minor cheliped carpus-palm upper margin 0.75 carapace length. Ischium upper margin smooth, lower margin with row of 6 similar oblique spines. Merus about as long as ischium; lower margin with oblique spine at midpoint. Carpus wider distally, 1.1 times as long as merus, 1.6 times as long as wide, upper and lower margins carinate. Palm as long as wide; upper and lower margins carinate; distomesial margin transverse. Fixed finger 0.7 length of palm, cutting edge lateral, with teeth along middle length. Dactylus tapering, curved, unarmed.

Pereopod 2 merus lower margin slightly sinusoidal, 2.7 times as long as wide; carpus 1.8 times as long as wide; chela subtriangular; palm about 1.7 times as wide as upper margin; dactylus 2.5 times as long as palm upper margin. Pereopod 3 carpus subtriangular, 1.8 times as long as wide; propodus upper margin convex, about as long as greatest width, lower margin evenly convex, with 1 slender subdistal spiniform seta, with 3 gaps between marginal setae; dactylus nearly straight, about as long as propodus upper margin. Pereopod 4 distal articles linear. Pereopod 5 chelate.

Uropod endopod and exopod overreaching posterior margin of telson. Endopod tapered-oval, widest near midpoint, 1.5 times as long as wide; upper surface with 10 small spiniform setae (2 on dorsal rib, 3 near anterior margin, 5 near distal-posterior margin); anterior margin straight, with small distal tooth; distal margin evenly convex, with 5 spiniform setae at anterodistal margin; posterior margin convex, setose. Exopod widest near midpoint, as long as wide; anterior margin almost straight; with about 12 blade-like setae on posterior margin indistinguishably merged with distal margin; dorsal plate extending 0.4 way across exopod, heavily armed with closely packed stiff setae merging with those on distal margin; distal and posterior margins also furnished with row of fine setae; upper face without setae.

Telson 1.2 times as wide as long, broadest at anterior third, narrowing posteriorly to rounded posterolateral corners; posterior margin medially excavate, with 6–8 irregularly spaced minute spiniform setae on each lateral half; dorsal surface with transverse row of 8 fine long setae.

Variation. The pattern of spiniform setae on the upper surface of the uropodal endopod varies. Two longitudinal rows of 3–5 anterior and 3 along the midrib are always present. While the number of setae near the distal-posterior margin varies as shown in fig. 51e, h–j, there is always a gap between the first and a group of 2–4.

Etymology. From Papetoai, type locality (noun in apposition).

Distribution. Southeast Polynesia ( French Polynesia, Moorea); low intertidal to immediate subtidal.

Remarks. Spinicallianassa papetoai (as S. sp. F-10) was clearly different from two other species (here identified as S. bilbili and S. spinicauda ) in the molecular analysis of Robles et al. (2020). It differs from these two and others in the shape of the eyestalk (laterally almost bilobed) and the pattern of spiniform setae on the upper face of the uropodal endopod.

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 51. Spinicallianassa papetoai sp. nov. French Polynesia, Moorea. UF 23875, holotype ovigerous female, 5.3 mm: a, b, eyestalks, carapace, pleomeres 1, 2 (dorsal, lateral); c, d, eyestalk, antennular, antennal peduncles, anterior carapace (lateral, dorsal); e, pleomere 6, telson, left uropod; f, g, maxilliped 3 (inner, outer views). Right uropod endopod apex: h, UF 16509, female, 5.2 mm; i, UF 16508 female, 4.4 mm; j, UF 16285 ovigerous female, 4.5 mm. Scale bars = 1 mm.

Figure 52. Spinicallianassa papetoai sp. nov. French Polynesia, Moorea. UF 23875, holotype ovigerous female, 5.3 mm: a, major cheliped (right, mesial); b, major cheliped (detail of gape and fixed finger); c, major cheliped fingers (lateral); d, major cheliped (carpus–dactylus, upper view); e, minor cheliped (left, mesial); f, minor cheliped fingers (lateral); g–i, pereopods 2–4; j, k, pleopods 1, 2. l, UF 16509, female, 5.2 mm, major cheliped merus (mesial). Scale bar = 1 mm.