Bythopussella

Brandão, Simone N., 2008, New species of Bairdioidea (Crustacea, Ostracoda) from the Southern Ocean and discussions on Bairdoppilata simplex (Brady, 1880),? Bairdoppilata labiata (Müller, 1908) and Bythopussella aculeata (Müller, 1908) *, Zootaxa 1866, pp. 373-452 : 442

Bythopussella sp. aff. B. brandtae

( Figs. 43 , 45.D–O, 47.F, G)

1969? Anchistrocheles ? sp. aff. A. aculeata, Maddocks : 113, Fig. 60m.

Material. 1 A F (SNB 0295), ANDEEP I, # 129–2–S, ZMH K­ 41324.

Distribution. Scotia Sea, Southern Ocean (Altantic Sector), 3631 to 3637m.

Measurements ( Fig. 43 ). LV, L 1.11mm, H 0.67mm.

Description. Valves large, with bairdiid outline in lateral view; entire lateral surface of valves strongly punctate, several conspicuous sensilla present. Dorsal margin of both valves tri­segmented, but LV more smoothly rounded, posterodorsal segment concave; anterodorsal segment of RV also concave; anterodorsal segment of LV slightly convex; anterior margin of both valves with 4 or 5 small spines; ventral margin of RV sinuous with conspicuous concavity in mouth region and upswung posterior; ventral margin of LV fairly straight, except posteriorly. Adductor muscle scars pattern with 3 anterior and 1 posteroventral scars.

Labrum and hypostome anteroventrally prolonged. AI robust with 7 podomeres, all sutures between podomeres conspicuous or fairly conspicuous. AII elongated, especially podomeres V. Md and MxI also very elongate. AII and ApV to VII terminal claws with tiny terminal hook. AII with elongate, slender podomeres; exopodite with 1 long and 1 medium­sized setae; podomere VI with 1 long claw, and 1 medium­sized and 2 small setae, all setae articulated. Md with 3 bifurcate teeth on masticatory base, exopodite with 3 long setae. Vibratory plate of MxI with 7 strahlen and more than 20 feathered setae; palp with 2 dorsal, 1 ventral, and 3 or 4 distal, medium­sized setae. ApV robust, vibratory plate with 5 strahlen and around 8 feathered setae. Podomere V of ApV to VII with 2 distal setae on podomere II; 1 long terminal claw, and 1 vestigial seta on podomere V. Exopodite of ApVI and VII without setae. Fu with 1 large and 1 medium­sized claw, and 2 medium­sized setae; 1 short seta between both Fu rods.

Remarks. No genital lobe was present in the single female of Bythopussella sp. aff. B. brandtae studied herein. The presence of 5 strahlen on the vibratory plate is not typical of this genus (usually there are 4).

Bythopussella sp. aff. B. brandtae differs from Bythopussella brandtae because the former species presents: (1) one long spine (broken during dissection) on the anterior of LV; (2) longer spine on the posterior margin of LV; (3) greater length in relation to height of carapace; (4) more conspicuous ornamentation, which is present on the entire lateral surface of valves; (5) exopodite of antenna II with 1 long and 1 medium­sized setae (instead of 1 long and 1short setae); (6) vibratory plate of ApV with 5 strahlen (instead of 4).

Bythopussella sp. aff. B. brandtae similar to Anchistrocheles ? sp. aff. A. aculeata illustrated by Maddocks (1969: 113, Fig. 60m) from the continental slope off Peru.

Figures

FIGURE 43. Length: height scatter plot of the valves of Bythopussella aculeata (Müller, 1908), Bythopussella brandtae sp. nov. and Bythopussella sp. aff. B. brandtae sp. nov.