Stegosoladidus debroyeri, Berge, 2001

Berge, JØrgen, 2001, Revision of Stegosoladidus Barnard and Karaman, 1987 (Crustacea: Amphipoda: Stegocephalidae), redescription of two species and description of three new species, Journal of Natural History 35 (4), pp. 539-571 : 562-569

Stegosoladidus debroyeri n. sp.

(®gures 21±26)

H OLOTYPE. Berlin ZMB 27336, immature female, 72ss25.40¾S, 16ss26.63¾W, 198±

260 m. PARATYPES. Berlin ZMB 27336 , two specimens. Additional material. WED 96 (Brussels), st. 6, 14 specimens, 71ss31¾S, 13ss34¾W,

254± 261 m.

Distribution. Known only from the Weddell Sea.

Description. Rostrum very small.

Antennae short. Antenna 1 shorter than antenna 2, ¯agellum four-articulate, accessory ¯agellum with two articles. Antenna 2 peduncle (articles 3±5) longer than ¯agellum, article 3 elongate, articles 3 and 4 geniculate; article 4 longer than article 5.

Epistome produced laterally, rectangular, with a long ridge on each side; epistomal plate (medial keel) produced into a small elongate medial ridge covering the entire epistome.

Mandible incisor transverse, smooth, left lacinia mobilis present, reduced, laterally straight, not conical.

Maxilla 1 palp uni-articulate, rectangular, apex not reaching above the apex of outer plate; outer plate distally rounded, ST in a pseudocrown, ST ®rst row with six setae (ST1±5, ST7), ST 1 ordinary (similar to ST 2±4), gap between ST 5 and ST 7, ST A present, located distally, part of ®rst row, ST B present, located medially, part of second row, ST C present; inner plate without a well developed shoulder, setae pappose.

Maxilla 2 ordinary, outer plate setae without distal hooks or cleft; inner plate setae row A covering the entire margin, clearly separated from row B, row A setae pappose, three or four ®rst setae diOEerentiated from the other setae (weakly pappopectinate); row B setae proximally simple, distally without cusps; row C present; row D absent.

Maxilliped palp four-articulate, article 2 distally unproduced, articles 1±3 inner margins with plumose setae, dactylus distally simple (pointed); inner plate not exceeding base of palp article 1; with two nodular setae; medial setae row present, not reduced, transverse, setae pectinate; distal setae row present, setae simple; inner setae row present, reduced to one or two setae, not conspicuously large; outer plate outer setae row present, marginal, setae attached normally, long robust, straight; inner setae row present, but strongly reduced, setae long robust, slender, appressed to outer setae row; distal setae-group absent.

Labrum very short; lobes symmetrical, both lobes reduced.

Labium distally broad, oval.

Coxal plates and basis on the pereopods smooth. Coxae 1±3 overlapping, broad.

Pereopod 1 coxal plate not as deep as basis, propodus subovate.

Pereopod 2 longer and thinner than pereopod 1, ischium elongate, ratio length 5 breadth exceeding 1.5, ischium distal posterior margin with plumose setae, propodus subrectangular, palm developed.

Pereopod 4 coxa posteroventral lobe large, reaching about the base of pereon segment 7; basis anterior margin without long setae, posterior margin with long setae, plumose setae on distal anterior margin, no plumose setae on distal posterior margin, ischium with plumose setae on posterior distal margin.

Pereopod 6 basis posteriorly expanded, expansion conspicuous, concave, with a row of long plumose setae.

Pereopod 7 basis anterior margin straight, distally rounded, with medial row of long setae, carpus present, dactylus present.

Oostegites on pereopod 2±5, gills on pereopods 2±7.

Pleonites 1±3 dorsally smooth.

Urosomites 2 and 3 fused. Uropod 1 peduncle longer than rami, outer ramus longer than inner. Uropod 2 peduncle longer than rami, outer ramus longer than inner. Uropod 3 peduncle longer than half the length of rami, outer ramus two-articulate, outer ramus longer than inner.

Telson longer than broad, shorter than peduncle uropod 3, cleft, apically pointed, no submarginal setae on apex of each lobe.

Males: unknown.

Etymology. The present species is named after Professor Claude de Broyer (Brussels), who kindly provided me with extensive material from Antarctica, including the present species.

Remarks. See remarks under S. antarcticus .