Andaniotes poorei, Berge, 2001

Berge, JØrgen, 2001, Revision of the Amphipod (Crustacea: Stegocephalidae) genera Andaniotes Stebbing, 1897 and Metandania Stephensen, 1925, Journal of Natural History 35 (6), pp. 787-832 : 809-814

Andaniotes poorei n.sp.

(®gures 14±17)

HOLOTYPE: Female A, Victoria J24063

PARATYPES: 16 specimens, Victoria J24063 , 41 ss 58.60 ¾ S, 148 ss 38.80 ¾ E, 500m .

Distribution Known only from the type locality.

Description

Length of males and females: 3± 4 mm.

Rostrum very small.

Antennae short. Antenna 1 longer than antenna 2; ¯agellum four-articulate; accessory ¯agellum article 2 absent. Antenna 2 peduncle (articles 3±5) longer than ¯agellum; article 3 short, about as long as broad; article 4 as long as 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.

Mouthparts not elongate or pointed.

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

Maxilla 1 palp uni-articulate, rectangular, setae long, simple, slender, apex not reaching above the apex of outer plate; outer plate distally rounded; ST in two parallel rows, ®rst marginal and second submarginal, 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±C present, part of second row; 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, ®rst three or four setae diOEerentiated from the other setae (weakly pappopectinate); row B setae proximally pappose, distally with cusps; row C present; row D absent.

Maxilliped palp four-articulate; article 2 distally unproduced; dactylus distally simple (pointed); inner plate not exceeding base of palp article 2, with three nodular setae; medial setae-row present, reduced to two setae but diOEerentiated from distal row, transverse, setae simple; distal setae-row present; inner setae-row present, row reduced to two setae, setae conspicuously large and strong; outer plate outer setaerow present, marginal, setae attached normally, setae long, robust, straight; inner setae-row present but strongly reduced, setae short simple, slender, parallel but not appressed to outer setae-row; distal setae-group absent.

Labrum very short; lobes symmetrical and reduced.

Labium distally broad, oval.

Coxal plates and basis on the pereopods smooth. Coxae 1±3 contiguous.

Pereopod 1 coxal plate deeper than basis; propodus subovate.

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

Pereopod 4 coxa posteroventral lobe medium sized, not reaching the base of pereon segment 7; basis anterior margin without long setae, posterior margin with long setae, plumose setae on distal anterior and posterior margins; 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; medial row of setae present, setae short and robust.

Oostegites on pereopods 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 shorter than inner. Uropod 3 peduncle at least as long as rami, outer ramus two-articulate, outer ramus longer than inner.

Telson longer than broad; shorter than uropod 3 peduncle; submarginal setae on apex of each lobe; cleft, apically rounded.

Males. Pereopod 2 propodus equally sized in males and females. Urosome conspicuously larger than in females; uropod 1 outer ramus ordinary; uropod 2 outer ramus enlarged, curved upwards; uropod 3 rami not reduced.

Etymology

This species is named after Professor Gary Poore (Victoria) who provided me with extensive material he had collected from mainly the Bass Strait.

Remarks

This species has closest a nities to A. linearis , but is separated from this species by the absence of a row of large robust simple setae on the basis of pereopod 6, by its triangular (versus conical) lacinia mobilis and by the much less setose inner plate and palp of the maxilliped.

As for the males, the combination of enlarged uropod 2 and the almost unreduced rami of uropod 3, separates the present species from all other species (but males are unknown for A. linearis ) of the genus except for A. pseudolinearis (see below).