New subgenus and new species of marine benthic ostracods of genus Doloria (Ostracoda; Myodocopina) from the Southern Ocean Author Chavtur, Vladimir G. Author Brandão, Simone N. Author Bashmanov, Alexander G. text Zootaxa 2012 3356 1 46 journal article 10.5281/zenodo.281585 e6de8d27-cb5e-4c67-8795-0751774fb543 1175-5326 281585 Doloria ( Dolorietta ) sp. nov. 2 ( Figs 23–28 ) Material. ZMH K- 41913 , ANDEEP I, PS 61, ANT XIX/3, St. 41–3, 59º21.69´S – 60º5.18´W to 59º22.55´S – 60º4.01´W , depth 2333–2359 m , 27 January 2002 : 1 juvenile female (carapace length 3.36 mm ); valves (right valve deformed) in micropaleontological slide; one limb of antennula, anterior body, upper lip, Bellonci organ, lateral eyes and medial eye in alcohol; remaining appendages mounted on permanent slide. Diagnosis. Juvenile female. Carapace : length 3.36 mm . Infold posterior to rostrum with about 9 short, simple bristles, and 2 long, double bristles forming a vertical row; 1 long, double bristle placed posterior this row. Antennula : sensory bristle of 5th segment with ten filaments, 7 proximal and 3 distal of which two are long, and the most distal is short. Mandibula : dorsal margin of basale with 1 proximal bristle; dorsal margin of 2nd endopodite segment with 7 long, 2 medium-sized and 5 short bristles. Fifth limb : main tooth of 1st exopodite segment with 5 pectinate teeth and proximally a broad, distally rounded process; 4th and 5th exopodite segments separated by a suture, with 4 and 2 bristles, respectively. Sixth limb : epipodial appendage with 3–4 bristles. Seventh limb : tip with comb of 13 teeth; limb with 23–24 distal and 34–39 proximal bristles. Furca : each lamella with 9 claws, 4th claw slightly more slender than 5th claw on right lamella only. Lateral eyes : absent. Bellonci organ : large and cylindrical, slightly pointed at tip. Anterior body : surface straight. Description of juvenile female. Carapace ( Figs 23 , 24 , 25A). Length 3.36 mm . Greatest height about 70% of maximum length ( Figs 23 A, 25A). Carapace oval, with rounded, posterior margin, and fairly deep incisur with overhanging rostrum ( Figs 23 A, 25A). Antero-ventral margin angular. Surface smooth. Infold broad anteriorly, narrow ventrally and slightly broader posteriorly ( Fig. 24 A). Infold posterior to rostrum with about 9 short, simple bristles together with 2 long, double bristles forming vertical row; 1 long, double bristle posterior to this row ( Fig. 23 B). Infold around margin of incisor bare. Antero-ventral and ventral infolds with numerous double bristles (1 long and 1 short) and without pores ( Fig. 23 C, D). Inner margin of posterior infold with raised list of tiny bristles and a dense row with pores. FIGURE 23. Doloria ( Dolorietta ) sp. nov. 2 (juvenile female: ZMH K-41913). Carapace: A, left valve in lateral view; B, rostrum, internal view; C, antero-ventral margin, internal view; D, anterior part, internal view. FIGURE 24. Doloria ( Dolorietta ) sp. nov. 2 (juvenile female: ZMH K-41913). Carapace: A, posterior part; B, posterior list; C, bristle on posterior list; D, pore at area between posterior list and posterior margin. Antennula (Fig. 25B, D). 1st and 2nd segments bare (Fig. 25B). 3rd segment with 2 bristles, ventral bristle subterminal, dorsal bristle proximal. 4th segment with 2 distal bristles, ventral bristle extending beyond the distal margin of 5th segment; dorsal bristle slightly shorter than 5th segment (Fig. 25B). Sensory bristle of 5th segment with 7 proximal filaments plus distally 3 more long filaments, and most distally another short filament. Medial bristle of 6th segment slightly shorter than 5th segment. Seventh segment: a-bristle broken; b-bristle with 2 short, proximal and 2 long, distal, pectinate marginal filaments; c-bristle with 8 long, proximal, pectinate filaments, and 1 short, distal, bare, marginal filament. 8th segment (Fig. 25D): d- and e-bristles bare, slightly longer than b-bristle; g-bristle longer than f-bristle, both with 8 long, proximal, pectinate filaments, and 1 short, distal, bare filament. Antenna (Fig. 25E–J). Protopodite slightly shorter than exopodite, and with a single relatively long, medial bristle. Endopodite 3-segmented (Fig. 25I , J): 1st segment with 2 short and 1 long proximal bristles, and 1 long, distal bristle about 2/3 length of 2nd segment. 2nd segment bare. 3rd segment with long, terminal filament fairly longer than endopodite. Exopodite (Fig. 25E–G): basal spines present on segments 3 to 9 (Fig. 25E–G); spines on 3rd to 8th segments distally conical, spine on 9th segment bifurcate or with small marginal teeth; spines on distal segments longer than those on proximal segments. Spine on 9th segment about 85% length of 8th segment. Bristle on 2nd segment (Fig. 25H) reaching the distal margin of 9th segment, with about 16 teeth on ventral margin; dorsal margin bare. Natatory setules present on bristles on segments 3 to 8. 9th segment with 4 bristles, all with natatory setules, dorsal bristle shorter than others. FIGURE 25. Doloria ( Dolorietta ) sp. nov. 2 (juvenile female: ZMH K-41913). A, left valve; B, anterior of body showing medial eye, Bellonci organ, antennula and upper lip; C, Bellonci organ; D, distal part of 1st antenna. Antenna: E, exopodite; F and G, distal part of exopodite; H, bristle of 2nd exopodite segment; I and J, endopodite. Mandibula: K, part of 2nd endopodite segment; L, distal part of coxale endite. Maxillula: M, cutting edge on 1st endopodite segment. FIGURE 26. Doloria ( Dolorietta ) sp. nov. 2 (juvenile female: ZMH K-41913). Mandibula: A, whole limb; B, part of 2nd endopodite segment; C, exopodite and parts of endopodite and basale; D, distal part; E, margin of basale; F, coxale endite. Sixth limb: G, epipodite. FIGURE 27. Doloria ( Dolorietta ) sp. nov. 2 (juvenile female: ZMH K-41913). Maxillula: A, whole limb (without distal part); B, distal part. Fifth limb: C, main tooth on 1st exopodite segment; D, bristle near main tooth on 1st exopodite segment; E, distal part of exopodite; F, anterior process of protopodite. FIGURE 28. Doloria ( Dolorietta ) sp. nov. 2 (juvenile female: ZMH K-41913). Sixth limb: A, whole limb; B, endites. Furca : C and D, right and left lamellae. Mandibula (Figs 25K, L; 26A–E). Coxale endite triangular, strongly spinous, at its tip with 2 stout spines (one bare the other with secondary stout, marginal teeth) with an intermediate minute peg (Figs 25L, 26F). A short bristle with blunt tip present at base of endite (Fig. 25L). Basale (Fig. 26E): dorsal margin with a short, proximal bristle, a long, distal bristle, and 2 long, terminal bristles (Fig. 25A). Ventral margin with 3 medium-length and 1 short a-bristles; a long and a short b-bristles; a medium-sized c-bristle and a long d-bristle. Exopodite longer than 1st endopodite segment, with a hirsute disto-dorsal margin and pointed tip and a medium-length and a long distal bristle (Fig. 26C). Endopodite: ventral margin of 1st segment with 4 distal bristles (1 short, 1 medium-sized and 2 long); dorsal margin bare. Ventral margin of 2nd segment with a few distal marginal spines, and 1 + 1 + 2 slender bristles. Dorsal margin with 2 medium-length and 5 short bristles; distal segment with 2 long and 1 shorter claw-like bristles, and 4 simple bristles (ventral bristle short) (Figs 25K, 26B, D). Maxillula (Figs 25M; 27A, B). 1st, 2nd and 3rd endites with 9, 6 and 6 bristles, respectively (Fig. 27A). Coxale with 1 stout, plumose bristle. Basale with 1 long and 2 medium-length bristles. Endopodite: 1st segment with 2 long α-bristles, 3 β-bristles (largest bristle with two rows teeth, the medium-length bristle with one row of teeth, the shortest bristle being bare; cutting edge with rounded small teeth (Fig. 25M). 2nd segment with 4 simple a-bristles; 3 strongly pectinate b-bristles; 3 c-bristles (2 pectinate and 1 simple), and 3 stout, bare claw-like d-bristles (Fig. 27B). Exopodite with 2 long (1 plumose, 1 usual), terminal and 1 shorter, marginal bristles (Fig. 27A). Fifth limb (Fig. 27C–F). Epipodial appendage deformed. Protopodite with straight thick, short, sclerotized anterior process on distal margin (Fig. 27F). Exopodite: main tooth consists of 5 pectinate teeth (Fig. 27C); proximal, broad process with rounded tip and 1 spinous bristle (with about 4 middle, slender teeth on both limbs) (Fig. 27D). Inner lobe of 3rd segment with 3 bristles (1 short, plumose and 2 long, simple bristles). Outer lobe with 2 long, plumose bristles. 4th segment with 4 bare bristles (Fig. 27E). Conspicuous suture between 4th and 5th segments, 5th segment with 2 bristles (1 plumose). 3rd to 5th segments hirsute (Fig. 27E). Sixth limb (Figs 26G; 28A, B). Epipodial appendage with 3–4 bare bristles and proximal to these bristles, a conspicuous protuberance (Fig. 26G). 1st endite with 2 long, distal and 2 short, medial plumose setae ( Fig. 28 B). 2nd endite with 2 long and one minute distal bristles, and two more relatively long, medial bristles ( Fig. 28 B). 3rd endite with 4 long, plumose, 1 short, bare and 1 short, spinous bristles ( Fig. 28 B). 4th endite with 5 long and 2 short bristles (4 long and 1 short, plumose, 1 bare) ( Fig. 28 B). Distal segment with 14 long, plumose bristles and 7 shorter spinous bristles ( Fig. 28 A). Seventh limb . Tip with comb of 13 elongated teeth with paired, middle marginal spines; middle tooth longer than others and recurved. Stout, crescent-shaped, bare tooth present opposite to comb. Limbs with 13 dorsal and 10–11 distal bristles with 1–4 bells, and 16 dorsal and 18–23 ventral bristles with 1–4 bells. Furca ( Fig. 28 C, D). Each lamella with 9 claws ( Fig. 28 C, D). 2nd claw slightly stouter than 1st claw. Right lamella: 4th claw more slender than 5th claw ( Fig. 28 C). Left lamella: 4th claw larger than 5th claw ( Fig. 28 D). Medial eye (Fig. 25B). Large, unpigmented. Lateral eyes . Absent. Bellocini organ (Fig. 25B, C). Large, cylindrical and slightly pointed at tip. Upper lip (Fig. 25B). Lip consisting of unpaired anterior part with glandular pegs along margin, 2 pairs of short tusks ventrally, and unpaired hirsute posterior lobe; anterior and posterior pairs of tusks with any glandular pegs. Anterior body (Fig. 25B). Straight with medium-sized, rounded, anterior process. Comparisons. Doloria ( Dolorietta ) sp. nov. 2 resembles D . ( D. ) levinsoni , but differs in (1) the type of double bristles on the antero-ventral and ventral infolds of the carapace; (2) the shape of proximal process on main tooth of fifth limb; (3) the Bellonci organ; and (4) the anterior body. Besides, D . ( D. ) sp. nov. 2 is close to D . ( D. ) sextafiliformis , but differs in (1) the bifurcated basal spine on the 9th exopodite segment of antenna; (2) the shape of the Bellonci organ; and (3) the anterior body (Table 3). Distribution. Recent. Drake Passage, Scotia Sea, Atlantic Sector of the Southern Ocean. Deep bathyal ( 2333–2359 m ). Remarks. This new species is left in open nomenclature because of the lack of adult specimens.