Archasterope weddellensis ( Kornicker, 1975 )

Chavtur, Vladimir G. & Keyser, Dietmar, 2016, Description of new members of the family Cylindroleberididae (Ostracoda: Cylindroleberidoidea) from the Southern Ocean, Zootaxa 4137 (3), pp. 301-329 : 304-312

publication ID	https://doi.org/ 10.11646/zootaxa.4137.3.1
publication LSID	lsid:zoobank.org:pub:238D23A9-B564-4C2E-9833-33243DA15144
DOI	https://doi.org/10.5281/zenodo.5610352
persistent identifier	https://treatment.plazi.org/id/803C111A-D25D-AF69-DD96-FDAD117A85E2
treatment provided by	Plazi
scientific name	Archasterope weddellensis ( Kornicker, 1975 )
status

Treatment

Archasterope weddellensis ( Kornicker, 1975) View in CoL

( Figs. 2–8 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 View FIGURE 7 View FIGURE 8 )

1975 Empoulsenia weddellensis , new species Kornicker: 514–524, figs. 323–328.

1986 Empoulsenia weddellensis Kornicker, 1975 View in CoL — Hartmann: 1986, 153.

1989 Empoulsenia weddelensis Kornicker, 1975 — Hartmann: 1989, 236 (spelling error). 1990 Empoulsenia weddellensis Kornicker, 1975 View in CoL — Hartmann: 1990, 200.

1996 Archasterope weddellensis ( Kornicker, 1975) View in CoL —Kornicker: in Kornicker & Poore 1996, 142 (list), 143 (key).

Material ( Fig. 1 View FIGURE 1 ). R/V “Polarstern”, ANT XXII /3, PS 67, 2005:

Stat. 151-1: ZMH-K-41903—adult female (length 3.26 mm), 2 juveniles (2.71 and 2.83 mm) and 6 possible juveniles (1.0– 1.97 mm);

Stat. 151-7: ZMH-K-41905—immature male (3.2 mm), 16 adult females (3.20–3.30 mm) and 11 juveniles (1.66–2.23 mm);

Stat. 153-7: ZMH-K-41904—adult female (3.3 mm), 12 adult females (3.18–3.44 mm) and 42 juveniles (1.22– 2.90 mm);

R/V “Polarstern”, ANT XIX /3, PS 61, 2002:

Stat. 46-7: ZMH-K-45819 6 adult females and 4 juveniles; ZMH-K-45820 2 adult females and 2 juveniles.

Description of adult female. Carapace ( Figs. 2 View FIGURE 2 , 3 View FIGURE 3 ). Carapace is elongated in lateral view, with evenly rounded posterior margin. Length 3.11–3.44 mm. Greatest height at mid-length. Infold: about 30 setae forming irregular row just within and parallel to antero-dorsal margin above incisur; about 25 short setae between this row and row of 15 setae along dorsal margin of rostrum ( Fig. 2 View FIGURE 2 B–D); about 40 setae present below incisur and on antero-ventral infold ( Figs. 2 View FIGURE 2 E, F, 3 A); broad list of posterior infold with about 20 broad transparent setae (= hyaline spines) with pores at bases, and about 100 more setae; posterior infold between broad list and posterior end of valve with 5 processes and about 16 setae ( Fig. 3 View FIGURE 3 B–D).

First antenna ( Figs. 4 View FIGURE 4 C–E; 5 A, B). 1st joint with medial and lateral spines ( Fig. 4 View FIGURE 4 C, D); 2nd joint also with medial and lateral spines, 1 short disto-lateral seta and without dorsal seta (broken?); 3rd joint with 1 small bare ventral seta and 6 long dorsal setae (all with long spines) ( Fig. 3 View FIGURE 3 C, E); 4th joint with 2 short ventral and 1 long dorsal setae. Sensory seta of 5th joint with short proximal filament and 6 long terminal filaments. 6th joint with medial seta. 7th joint ( Fig. 5 View FIGURE 5 A, B): a-claw smooth, c-seta with 3 marginal and 2 terminal filaments. 8th joint ( Fig. 5 View FIGURE 5 A, B): d- and e-setae bare, d-seta somewhat shorter and more slender than e-seta; f-seta with 4 marginal and 2 terminal filaments; g-seta with 4–5 marginal and 1–2 terminal filaments.

Second antenna ( Fig. 5 View FIGURE 5 C–F). Protopodite with short slender medial seta ( Fig. 5 View FIGURE 5 D, E). Endopodite 3-jointed with terminal filament only slightly longer than stem ( Fig. 5 View FIGURE 5 D, F). Exopodite 9th joint with large terminal process ( Fig. 5 View FIGURE 5 C).

Mandible ( Figs. 6 View FIGURE 6 A–E; 7 A–D). Coxale endite ( Fig. 7 View FIGURE 7 A, B): ventral branch with spines forming 4 rows and tip with 2 small spines; ventral margin of dorsal branch with 6 pairs of teeth, small process set with setules and tip represented by 2 slender long spines. Basale endite ( Figs. 6 View FIGURE 6 A; 7 C, D) with 4 dentate terminal setae, glandular peg, 2 dwarf setae and 2 triaenid setae ( Fig. 6 View FIGURE 6 E, F). U-shaped margin depression and short triaenid seta present on basale proximal endite. Dorsal margin of basale with 4–6 middle setae ( Fig. 6 View FIGURE 6 A–C). Exopodite about one-third the length of 1st endopodite joint, with hirsute tip and 2 terminal setae ( Fig. 6 View FIGURE 6 A–C). Endopodite first joint with 3 long spinous ventral setae. Second joint ( Fig. 6 View FIGURE 6 A, D, E): dorsal margin with 2 midlength slender proximal setae with short spines, stout spinous a-, b-, c- and d-setae, 1 slender short seta between a- and b-setae, 1 slender long seta between b- and c-setae, 1 slender long seta between c- and d-setae and 8 cleaning setae (4 at base of b-seta and 4 at base of c-seta); ventral margin with 3 long spinous setae. Third joint with stout claw and 5 setae.

Maxilla ( Fig. 7 View FIGURE 7 E, F). Epipodial appendage large with long narrow tip ( Fig. 7 View FIGURE 7 E). Proximal and distal endites each with 3 long setae. Dorsal margin of basale with 1 proximal and 3–4 short setae, all bare; ventral margin with 7 short proximal and 1 long distal setae, all bare. Endopodite: suture between 1st and 2nd joints absent; 1st joint with 1 short alpha-seta and 1 long beta-seta; seta of end joint slightly longer than beta-seta on 1st joint.

Fifth limb ( Fig. 7 View FIGURE 7 G). Epipodial appendage with about 70 setae. Spinous exopodial seta reach distal end of comb. Comb with 4 setae near ventral margin.

Sixth limb ( Figs. 6 View FIGURE 6 F; 8 A). Anterior margin with upper and lower setae; antero-ventral corner and flap with total of 5–6 setae ( Fig. 6 View FIGURE 6 F); postero-ventral margin with 21–24 setae.

Seventh limb ( Fig. 8 View FIGURE 8 B). Each limb with 16–17 setae: 12–13 proximal (6+6 or 6+7) and 4 distal setae (2+2), each seta with 3–4 bells; opposing terminal combs each with 13 teeth with pointed tip.

Caudal furca ( Fig. 8 View FIGURE 8 C, D). Left lamella with 9 claws and right lamella with 10 claws (3 posterior ones on each lamella seta-like); claws 1–6 (7) with small teeth on posterior edge ( Fig. 8 View FIGURE 8 C).

Medial and lateral eyes ( Fig. 4 View FIGURE 4 C, D). Medial eye large, bare; lateral eye small with several ommatidia.

Rod-shaped organ ( Fig. 4 View FIGURE 4 A, B, D). 1-jointed, widening near middle and tapering to rounded tip.

Lips ( Fig. 4 View FIGURE 4 D, F): Upper lip consisting of hirsute left and right lobe on low central part, each lobe with one small process.

Description of immature male.

Carapace. Length 3.2 mm. Smaller rounded at posterior than female. Greatest height at the first third of the carapace.

Second antenna ( Fig. 8 View FIGURE 8 H). Endopodite: 3-jointed; 1st and 2nd joints bare; suture between 1st and 2nd joints indistinct; 3rd joint with proximal ventral seta with blunt tip.

Rod-shaped organ ( Fig. 8 View FIGURE 8 E, F). Two jointed, slightly tapered.

Upper lip ( Fig. 8 View FIGURE 8 F, G). Upper lip consisting of hirsute left and right lobe on low central part, left lobe with 2 small spines (of which 1 spine placed on process) and right lobe with 1 small process ( Fig. 8 View FIGURE 8 G).

Remarks. Our specimens are somewhat different from the specimen described by Kornicker 1975 (see Table 3 View TABLE 3 ).

number of transparent and common (in brackets) setae on list of 34–35 (160) 20 (100) posterior infold

Distribution. This species lives in the Weddell Sea and adjacent waters at a depth range of 132–2124 m ( Kornicker 1975; Hartmann 1986, 1989, 1990; herein).