Papuadocus blodiwai Corbari & Sorbe, 2015, sp. nov.
Creators: name: Corbari, Laure
name: Sorbe, Jean Claude
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Maeridae
Papuadocus
Papuadocus blodiwai

description: Papuadocus blodiwai sp. nov.
(Figs 2–8).
Material examined. Holotype, brooding female, BL = 16.8 mm (MNHN-IU-2013-1647). Bismarck Sea, off Vanimo, 21 December 2012, station CP4062, 02°37’S – 141°18’E, 500–580 m, muddy sediment, collected within a wood fragment.
Paratypes: 1 male, BL = 17.6 mm (MNHN-IU-2013-1619). 1 female, BL = 15.2 mm (MNHN-IU-2013-1574). 1 juvenile, BL = 4.6 mm (urosome broken) (MNHN-IU-2013-1648). 1 juvenile, BL = 4.2 mm (urosome broken) (MNHN-IU-2013-1649). Data as for the holotype, all paratypes collected in wood fragments.
Type locality. Off Vanimo, Bismarck Sea, Papua New Guinea, 02°37’S – 141°18’E.
Etymology. The epithet is the Tok Pidgin word blodiwai meaning ‘belong to wood’.
Diagnosis. Same as for new genus
Description of female holotype
Body (Figs. 2, 3) elongate and laterally compressed. Rostrum lacking. Eyes absent but presence of yellowish pigment along head anteroventral margin on fresh specimens. Lateral cephalic lobe weak. Pleonites 1–3 not toothed on posterodorsal margin. Urosomites 1–2 toothed. Urosomite 1 with small dorsal depression, five teeth (one median, two lateral) on posterodorsal margin and one stout seta in each indentation. Urosomite 2 with only two lateral teeth on posterodorsal margin. Urosomite 3 with or without one lateral stout seta. Epimeron 1 anterodistal corner rounded, posterodistal corner with small tooth, posterior margin convex. Epimeron 2 similar to epimeron 1, posterior margin finely serrated. Epimeron 3 larger, anterodistal corner rounded, posterodistal corner with small tooth, posterior margin straight and finely serrated.
Coxae (Figs 2, 3, 5, 6). Coxae 1–3 longer than wide; coxa 1 not produced anteriorly; coxa 4 wider than coxae 1–3, posterior margin slightly concave; coxae 5–7 wider than long; coxae 5–6 with anterodistal lobe; coxa 7 smallest, without anterodistal lobe. Oostegites on coxae 2–5, elongated, fringed with large setae. Gills on coxae 2–6.
Antenna 1 (Fig. 4) as long as head + first 5 pereonites. Peduncle article 1 shorter than articles 2–3 combined; article 2 more than twice as long as article 3. Main flagellum longer than peduncle, with 24–39 articles. Accessory flagellum shorter than peduncle, with 8–9 articles, article 1 as long as article 1 of main flagellum, distal article minute.
Antenna 2 (Fig. 4) shorter than antenna 1. Article 2 not enlarged, gland cone with blunt apex, prolonged by a short cylindrical process. Article 4 subequal to article 5. Flagellum with 10–17 articles.
Mouthparts (Fig. 4).
Upper lip articulated with epistome, distally setose.
Mandible incisor well developed, with many clearly demarcated teeth. Setal row with long setae. Left lacinia mobilis heavily chitinous and with five distal teeth; right one smaller, less chitinous and with two distal teeth. Molar broad, triturative. Palp 3-articulate; article 1 shortest (0.30 palp length); article 2 longest, with dense longitudinal row of setae on posterodistal half; article 3 falcate, with dense longitudinal row of setae along posterior margin and a few long simple setae along anterior margin and at apex.
Lower lip not well observed (difficult to dissect and not drawn), with mandibular processes.
Maxilla 1, left and right palps dissimilar. Left maxilla 1, inner plate (not drawn) small, inner margin with submarginal row of short simple setae and marginal row of long plumose setae; outer plate with thick denticulate setae and thinner serrated setae probably in 6/5 simple arrangement (difficult to observe on microscopy slides), patch of setules on inner distal side; palp 2-articulate, proximal article 0.43 length of distal article, distal article slightly curved, with marginal and submarginal rows of simple setae on inner distal margin. Right maxilla 1, inner and outer plates as in left maxilla 1; palp 2-articulate, proximal article 0.19 length of distal article, distal article curved and widening towards distal apex, with 8 cuspidate setae on distal part and five submarginal simple setae.
Maxilla 2, inner plate wider than outer, with marginal row of simple setae along 0.75 distal length of inner margin, submarginal oblique row of simple setae on posterior face and submarginal rows of simple setae on apex. Outer plate with one marginal and two submarginal rows of simple setae along apex and distal inner margin. Patch of setules irregularly settled on proximal inner area.
Maxilliped, inner plates rectangular, long and reaching proximal part of palp article 2, with three or four apical stout teeth on mesiodistal corner and row of simple setae along distal margin. Outer plates with convex outer margin, reaching distal end of palp article 2, with submarginal row of 14–15 stout setae along mesial margin and submarginal row of long simple setae along apex and mesial margin. Palp robust, elongated, article 2 longer than article 3, both heavily setose (simple setae) on mesial margin, article 4 stout, inserted subdistally on article 3, shorter than half length of article 3, with setules on distal half of outer margin and one long stout seta on apex.
Gnathopod 1 (Fig. 5) subchelate. Basis with several long simple setae along median posterior margin, one transverse row of setae on posterodistal corner and four submarginal transverse rows of simple setae on proximal anterior part. Ischium shorter than merus, with one transverse row of setae on posterodistal corner. Merus with long simple setae along posterior margin and one subdistal transverse row of simple setae. Carpus longer and wider than propodus, with heavy setation on posterior margin and fewer simple long setae along anterior margin. Propodus rectangular, with many transverse rows of simple setae along anterior and posterior margins; palm transverse. Dactylus naked.
Gnathopod 2 (Fig. 5) subchelate. Basis weakly setose on posterior margin, with transverse row of short simple setae near postero- and anterodistal corner. Ischium slightly shorter than merus, with one transverse row of simple setae near posterodistal corner. Merus with transverse rows of simple setae along posterior margin. Carpus triangular, posterior margin slightly projecting and heavily setose (simple setae) and anterodistal margin with a few short simple setae. Propodus longer and wider than carpus, widening distally, with transverse rows of simple setae on posterior margin, palm oblique with large excavation in which dactylus rests, outer margin of excavation strongly dentate with two stout setae on distal corner; inner margin with proximal dentate protuberance (near dactylus articulation) and tooth on distal corner. Dactylus well developed and curved, one simple seta on proximal part of anterior margin.
Pereopods (Fig. 6). Pereopods 3–4 similar, all articles with isolated setae; dactylus short and curved, enlarged proximally, with distal nail and one median simple seta on posterior margin. Pereopods 5–7 with similar structure but increasing size; basis posteriorly expanded and serrated; ischium-propodus articles sparsely setose (simple and stout setae) on both margins; dactylus similar to pereopods 3–4 dactylus.
Pleopods (Fig. 2) long, with 20–27 articles, proximal ones with different lengths according to rami.
Uropods (Fig. 7) biramous. Uropod 1, peduncule with one basofacial stout seta and with stout setae along inner and outer margins; both rami shorter than peduncle, with stout setae along margins and at apex; outer ramus shorter than inner. Uropod 2 similar to uropod 1, but without basofacial seta on peduncle. Uropod 3, peduncle shorter than rami, with stout distal setae; rami foliaceous, subequal, uniarticulate, with stout setae along inner and outer margins, distally dentate with many simple setae and few cuspidate setae between teeth.
Telson (Fig. 7) deeply cleft (cleft 0.71 telson length), reaching 0.6 length of uropod 3 rami, with two submarginal setae near outer margin of each lobe; lobes more or less convergent, without apical setae.
Remark on male paratype. The unique male (MNHN-IU-2013-1619) collected in the Bismarck Sea is slightly longer than the two females sampled at the same station. Except for primary sexual characters, its general morphology is similar to that of females and its gnathopods 2 are not sexually dimorphic (Fig. 8).
description: Published as part of Corbari, Laure & Sorbe, Jean Claude, 2015, Papuadocus blodiwai gen. nov., sp. nov. (Crustacea: Amphipoda: Maeridae), a new bathyal species associated with sunken wood in the Bismarck Sea (Papua New Guinea), pp. 406-420 in Zootaxa 3914 (4) on pages 411-418, DOI: 10.11646/zootaxa.3914.4.2, http://zenodo.org/record/287755