Andaniotes pooh, 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 : 804-809

Andaniotes pooh n.sp.

(®gures 9±13)

HOLOTYPE: Maine: Female , 50 ss 52 ¾ S, 166 ss 42 ¾ E, 135±139 m.

PARATYPE: Maine: Male , 56 ss 19 ¾ S, 158 ss 29 ¾ E, 833±842 m.

Additional material: Maine: two females, 52 ss 17 ¾ S, 160 ss 40 ¾ E, 659± 798 m .

Distribution

Known from three diOEerent stations, all in the eastern subantarctic region (50±56 ss S, 158± 166 ss E), 135± 842 m.

Description

Length of females: 5±6 mm, male: 7 mm.

Rostrum very small.

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

Mouthparts not elongate or pointed.

Mandible incisor transverse, smooth; left lacinia mobilis present, reduced, laterally straight, conical.

Maxilla 1 palp uni-articulate, rectangular, apex 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 four nodular setae; medial setae-row present, not reduced, transverse, setae cuspidate; distal setaerow present; inner setae-row present, not reduced (more than two setae), setae conspicuously large and strong; outer plate outer setae-row present, marginal, setae attached normally, long, robust, straight; inner setae-row present but strongly reduced, setae long, robust, 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 not covered with setae. 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 margin, without 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, 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 longer than inner. Uropod 3 peduncle at least as long as rami, outer ramus two-articulate, outer ramus shorter than inner.

Telson longer than broad; shorter than uropod 3 peduncle; no 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 enlarged, curved upwards; uropod 2 outer ramus enlarged, curved upwards; uropod 3 rami ordinary.

Etymology

The present species is the only known species in which males have both uropod 1 and 2 outer ramus enlarged ( A. abyssorum also has both enlarged, but not as strongly on uropod 2 as in the present species); all other species in this genus have only one of the uropods enlarged. Furthermore, the rami of uropod 3 are not reduced, as in most male congeners. As an analogy, this species is named after one of my all times favourites, Winnie the Pooh (see Milne, 1973), who, when Rabbit asked him`Honey or condensed milk with your bread?’, answered`Both. [...] But don’t bother about the bread, please.’ (i.e. it has both uropod 1 and 2 enlarged, but not uropod 3 reduced).

The name`pooh’ is a noun in apposition.

Remarks

The present species has the basis on pereopod 6 concave as in A. linearis , but a maxilliped palp more similar to that found in A. pseudolinearis . It has four nodular setae on the inner plate of the maxilliped, a character state not found in any other species in the genus. It is, however, the male that is easiest to distinguish from congeners, in that it has the outer ramus on both uropod 1 and 2 enlarged, and the epistome is rectangular (not rounded as in A. abyssorum which also has the two ®rst uropods enlarged).