This work is a taxonomic account of some (35 species) of Ostracoda in the suborder Myodocopina collected between 1986 and 1988 by the staff of the Museum of Victoria and the Victorian Institute of Marine Sciences on the continental slope of SE Australia. Not all samples collected during the two cruises were processed for ostracods.
Sensory bristle of 5th segment with 9 long proximal filaments (1 single followed by 2 pairs and 4 single), 3 short distal filaments and bifurcated tip. 1st endopodial joint with 4 ventral bristles (1 long with long spines, 1 long with short spines, 1 short with short spines, 1 minute bare or with short spines).
USNM 193860 with 32 eggs in marsupium (2 eggs shown in Figure 4/), length of typical egg 0.89 mm
3rd joint with medial spines and 2 spinous bristles (1 ventral subterminal, 1 dorsal at midlength); 4th joint with 2 bristles (1 ventral subterminal, 1 dorsal terminal with base on medial side). Sensory bristle on 5th joint with 9 long proximal filaments (1 single followed by 3 paired and 2 single), 3 shorter distal filaments and bifurcated tip.
2nd exopodial joint with 4 ringed a-bristles and 4 ringed b'-bristles, otherwise similar to adult female. Anterior part of body (Figure 5/): Anterior process similar to that of adult female except upper process less rounded.
Key to Species of Vargula in the Vicinity of SE Australia (Adult females; excludes V. antarctica)
1st endopodial joint with several minute indistinct terminal spines on dorsal margin and 4 ventral punctures (1 minute, 1 short and 1 long, all with short spines, 1 long with proximal long spines and short distal). Second endopodial joint with 4 hairs a (anterior glabrous, the other with a few minute spines, the other with strong anterior spines, the posterior with small anterior spines) (Figure 7e), 3 pectinate punctures b (Figure 7/) , 3 punctures c (Figure 7g) and 3 d pectinate hairs (2 weak, claw-like) (Figure lh).
Broad list before caudal process of left valve with row of 14-minute setae in middle and about 80-minute pore canals near posterior margin of ventral 2/3, some projecting slightly beyond posterior margin on minute processes, but posterior margin of leaf generally smooth (dorsal part of the list is shown in Figure 8c). Margin: Proximal ridge of margin along ventral margin of notch with dentate row (Fig. Hb).
2nd endopodial joint with 4 ringed hairs a (3rd counted from anterior stout pectinate, others thin glabrous), 3 ringed pectinate hairs b, 3 ringed hairs c (smaller glabrous, others with pectinate) and 3 d-posor pectinate perforations (ringed, others unringed) (Figure \2g-i). Last joint with 15-17 barbed hairs (4 or 5 short barbed hairs, others with long proximal and short distal barbs) and then 2 stout plumose hairs. Right limbs of USNM 194009 with short space between anterior punctures and 3 posterior hairs; space is missing in the left limb).
29 1962:278). The present species has been referred to Vargula
USNM 193892, ovigerous female on slide and in alcohol
3rd endopodial joint with 3 claws (dorsal claw bare, others with proximal teeth) and 4 ringed bristles (dorsal lateral bristle with pointed tip) (Figure 156). 3rd joint with 2 bristles (ventral subterminal or terminal, dorsal 'A to lfa joint length from proximal end) with short spines, no bristles reaching distal edge of 4th joint 4th joint with 2 terminal bristles (dorsal bristles reaching middle of 6th joint, ventral about twice as long) with short spines.
1st endopodial joint with 4 ventral hairs (1 minute glabrous, 1 short and 1 long with short spines, longest with short spines except for ring of long spines at distal V*). 2nd endopodial joint with 4 a-bores (front glabrous, next with slender teeth, 3rd strong with strong teeth and narrow obtuse tip, 4th with slender teeth), 3 pectinate-ringed b-bores, 3 pectinate-ringed c-bores (2 shorter than b-hairs), and 3 pectinate d-hairs (anterior 2 unringed, others ringed).
3rd endopodial joint with 3 stout claws (lateral with 5 proximal teeth (distal teeth more stout), others glabrous; dorsal claw about half of longest claw), a stout dorsal claw-like hair (with pointed tip) about 2/3 length of longest claw, and 3 ventral bristles (lateral bristles rather stout proximally but not bulbous and no spines observed). 1st endopodial joint with dorsal spines, few medial hairs near incisor, 2 alpha hairs (outer with abundant short hairs, inner with few indistinct small hairs), and 3 pectinate beta hairs; incisor smoothly rounded (Figure 16/).
Back of body (Figure 20/r, i): With 7 segments on each side continuous across back of body, each segment bending ventrally (Figure 20A); the rounded posterior end of each segment viewed posteriorly forms a visible rim (Figure 20i). Medial bristle on 6th joint with few marginal spines (right limb of USNM 194003 differs in having bristles normally on 6th joint on 7th joint).
Second Antenna: Distal medial bristle about 3A length of long proximal bristle of 1st endopodial joint; otherwise protopodite similar to that of mature female. Mandible (Figure 24b): Medial bristles of terminal pair on ventral margin of 2nd endopodial joint broader than that of female; limb otherwise similar to that of adult female.
1st endopodial joint with 4 bristles (1 long with long proximal and short distal spines, 1 long and 1 short with short spines and 1 minute bar). 2nd endopodial joint with 4 ringed pectinate a-bristles (Figure 26e), a total of 6 b- and c-bristles and 3 pectinate d-bristles (anterior urinated claw-like, others ringed) (Figure 26g).
1st endopodial joint with 4 ventral setae (1 long with long proximal and short distal spines, 1 long, 1 short and 1 minute with short spines). 3rd endopodial joint with 3 claws (with partially formed annuli (not shown) and with few proximal teeth (dorsal claw with teeth on only 1 of 4 arms examined)) and 4 ring setae (longest ventral seta with ventral spines usually restricted to proximal half ).
Sensory seta of 5th joint with 9 or 10 long stout proximal filaments, 2 slender distal filaments and forked tip. Exopodite: seta of 2nd joint extending to 9th joint, with 9 ventral spines; bristles of joints 3-8 with revolute hairs, without spines; 9th joint with 3 bristles (2 long with rotating hairs, 1 short glabrous);.
1st endopodial joint with long dorsal hairs, 2 alpha hairs (shorter with short hairs, longer with long hairs) (beta hairs missing in USNM 194036), and incisor with 3 cusps ( Figure 37A ). 2nd endopodial joint with 4 ringed pectinate a hairs (anterior brush with posterior teeth, others with anterior teeth, all hairs with pointed tips) (Figure 380, 3 pectinate b hairs (2 ringed, 1 unringed claw-like), 3 c hairs (1 minute, 2 thick ringed pectinate), and 3 stout pectinate d-bores (posteriorly ringed, other unringed claw-like) (Figure 38y).
Tip of projecting caudal process forming sharp angle with valve edge dorsal to caudal process 2
Tip of projecting caudal process smooth joining of valve margin dorsal to caudal process or with broadly rounded caudal process 3 2. Scapula with broadly rounded caudal process; mandibular basal with 3 dorsal bristles; Bellonci organ very short (less than width of 1st joint of 1st antenna) P.
Carapace shorter than 1.8 mm; 2nd joint of 1st antenna with 3 bristles; 7th limb with
1st endopodial joint: ventral margin with 4 bristles (3 long, 1 short (1 of 3 long bristles missing (broken off?)) on illustrated left limb of holotype and only proximal part of 2 bristles shown) with long spines (not shown); medial surface with spines at dorsal margin 3rd endopodial joint with 3 claws and 4 hairs (1 of the latter (lateral) obscured on holotype and not seen with certainty.
3rd endopodial joint with 4 spinous setae and 3 glabrous claws (dorsal claw l/2 length of longest claw). 3rd exopodial joint with 3 spinous setae on inner lobe and 2 with long spines on outer lobe.
1st endopodial joint with 4 long ventral terminal spinous processes (not shown) and a row of terminal spines on the dorsal margin. 2nd endopodial joint with 3 claws (dorsal claw about half the length of the longest claw; long medial claw slightly shorter than the lateral claw; all claws with spines along the center of the ventral edge) and 4 spiny setae.
2nd endopodial joint: dorsal margin with proximal spines and 9 spinous processes (3 in proximal group, 6 in distal group); ventral margin with 2 groups of spiny bristles, each with 3 bristles; medial surface with rows of spines. 3rd exopodial joint with 3 spiny bristles on the inner lobe and 2 fluffy bristles on the hairy outer lobe.
1st joint short with 6 small bristles (5 proximal, 1 distal); 2nd joint elongate with 3 ventral bristles
Basal with 3 long spiny terminal hairs (1 along anterior margin, 1 long spiny alpha bristle (Figure dorsal, 2 ventral (1 medial, 1 lateral)) (Figure 4%d). Exopodites 48d,e) and 3 fairly straight glabrous beta hairs (Figure 48*,/)-. End joint with 8 hairs (posterior 2 plumes, others with long hairs or spines except for short spines near tip).
Second endopodial joint with 3 claws (dorsal claw about half length of longest claw; long medial claw slightly shorter than lateral claw) with proximal spines and 4 punctures surrounded by slender claw-like tips (Figure 50i). First endopodial joint with long alpha hairs (with long hairs (not shown)) and 3 weak beta hairs ( Figure 52h ).
Exopodite of mandible ! A length of dorsal margin of 1st endopodial joint
Fang-like tooth of 1st exopodial joint on 5th limb with 4-6 stout teeth along inner edge P. 3rd endopodial joint with 1 long stout dorsal claw, 1 shorter and slimmer ventral bristle-like claw and 4 short medial bristles (1 with marginal spines and urinate could be interpreted like a claw). Rings not shown on all brushes illustrated.).
Endopodite 2-jointed (Figure 54b): 1st joint with 5 short glabrous proximal setae and 1 long spiny distal seta; 2nd joint elongate, with 1 long spiny ventral seta at middle and 1 shorter terminal seta with indistinct spines. 1st endopodial joint with 4 annular terminal ventral setae (2 long with long proximal and short distal spines, 2 short).
Exopodite: 1st joint with a small flat terminal medial seta; articular setae 2-5 short with 10-13 ventral spines and spinous terminal segment; setae of joints 6-8 long with revolute hairs, without spines; 9th joint with 7 setae (4 long with rotating hairs, 2 short with long hairs, 1 minute glabrous); joints 3-8 with basal spines increasing in length on distal joints; spine of 8th joint as long as 9th joint; articles 3-8 with row of fairly long spines along distal margin. Maxilla: Endite I obscured, but with 2 long spiny setae, 2 stout pointed claw-like setae, and other setae;
101 egg in marsupium (location of egg shown in Figure 53a,b);
103 posterior to ventral end of girdle, and long hairs near
FIGURE 5&.—Pleoschisma pseudcferox, new species, female in late larval stage (A-1 or A-2), holotype: a, whole specimen from left side showing location of attachments of central adductor muscle, length 1.8S mm; b, appendages of the central adductor muscles, left valve, ov, anterior left; c, endopodite, right 2nd antenna, mv; d, bristles of the 3rd endopodial joint, right mandible, mv; e, part of the left 5th limb, av; / , 2nd exopodal joint, right 5th limb, pv; g, left 6th article, mv (not all setae shown); h, tip of the 7th leg; i, medial eye and BeUond organ; j , right lateral eye and part of right 1st antenna; k, left Y-sclerite, anterior left.
105 (shortest bare, next with minute spines, others with stout
109 59b) to ventral end of caudal process, with row of minute
A-l male in alcohol; USNM 194019,1 adult male on slide and in alcohol
1st endopodial joint with 3 small ventral setae (dashed in Fig. 66a); medial surface with abundant spines. Terminal joint with 4 or 5 anterior setae on projection, then with 3 stronger setae (2 posterior setae plumose to tip).
Figure 67h): 1st joint short with 5 bare bristles (4 proximal, 1 at midlength); 2nd joint elongate with 2
Sensory bristles of the minute 5th joint with a broad proximal portion extending beyond the proximal edge of the 6th joint and with abundant thin filaments (few filaments shown in Figure 64e; none shown in Figure 67/); stem with short, pointed filament just distal to broad proximal part, dorsal spines of 2 minutes at mid-length, and forked tip. 7th joint: bristles about the same length as bristles of the 6th joint, annulated, spiny; b bristle about twice as long as a bristle, with 3 short proximal filaments, 1 minute distal dorsal spine and 2 papillae at the tip; c -hair broken on both limbs of USNM 194019, with 5 filaments on the stump.
3rd joint with a few short ventral and medial spines, numerous long dorsal and lateral hairs and 2 short spinous setae (1 ventral, 1 dorsal). 5th joint with spines on distal corners (Fig. 69/) and long ventral bristle with 4 short proximal filaments and several short terminal filaments.
2nd endopodial joint: dorsal margin with 4 or 5 hairs; joint otherwise similar to mat of mature female. 3rd endopodial joint: ventral pointed b brush with 4 proximal ventral teeth; joint otherwise similar to that of adult female.
Key to Species of EusarsieUa in Collection (Adult females)
Carapace longer than 2 mm E.fallomagna, new species Carapace shorter than 1.8 mm 2
ETYMOLOGY.—From the Greek bex (cough)
HOLOTYPE.—Ovigerous female with body separated from shell in alcohol (with 2 eggs, 1 female choniostomatid copepod
NONTYPES.—Slope 56: USNM 193947, 1 adult male on slide and in alcohol
Carapace round in lateral view and with long slender posteroventral caudal process and posterodorsal bulge appear-
Epizoa: An ovigerous female from slope 56 with small foraminifera attached to the outer surface of the right valve near the caudal process. Article 8: d- and e-bristles are longer than b-bristles, bare with blunt tips; f-bristle about the same length as e-bristle, with 1 small proximal filament, 3 small distal filaments and forked tip;.
135 g-bristle longer than f-bristle, with 1 small proximal filament,
USNM 193944: a, upper lip and esophagus, anterior to left; b, posterior of body from right side, anterior to right Ovigerous female, holotype: c, dorsal view of complete specimen showing 4 eggs in pouch, length 2.2 mm, anterior to right; d, anterior view of complete specimen, ventral to right (slightly oblique view), e, ovoid female, paratype, complete specimen from left side with bryozoan attached to left valve, length including caudal process 2.2 mm. Adult female, paratype, USNM 193989:/, dorsal view of complete specimen, length including caudal process 2.53 mm, anterior to left; g, 5th limb; h.
139 process (Figure 16d,e)
9th joint with 3 setae (ventral with thin ventral spines and distal natural setae; 2 dorsal short glabrous setae (Figure 97e); joint 2 with 2 rows of short spines; joints 3-7 with spines forming a single row; joints 4-8 with small basal spines; spine of the 8th joint approximately the same length as the 9th joint (dashed line in Figure 91e). 1st endopodial joint: dorsal margin with row of slender terminal spines; ventral margin with 3 terminal setae (1 small bare annulated medial; 1 stout medial (with distal rings, claw-like proximal part and slender marginal spines (proximal spines longer and slightly thicker than distal spines); .. and 1 stout lateral claw-like with slender spines along the ventral margin).
I also confirmed that the 2nd endopodial joint of the mandible is missing. The g-sclerite usually connects the posterior end of the f-sclerite to the MLS (Figure 109
