Scleroconcha gallardoi Kornicker, 1971

Chavtur, Vladimir G. & Keyser, Dietmar, 2016, Benthic myodocopid Ostracoda (Philomedidae) from the Southern Ocean, Zootaxa 4141 (1), pp. 1-70: 20-26

publication ID

http://doi.org/10.11646/zootaxa.4141.1.1

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http://treatment.plazi.org/id/18659911-FFA2-C929-FF08-B619FB5BFA65

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scientific name

Scleroconcha gallardoi Kornicker, 1971
status

 

Scleroconcha gallardoi Kornicker, 1971 

( Figs. 12–15View FIGURE 12View FIGURE 13View FIGURE 14View FIGURE 15)

1971 Scleroconcha gallardoi Kornicker  : 194, Fig. 18View FIGURE 18.

1975 Scleroconcha gallardoi Kornicker, 1971  —Kornicker: 321–324, Figs. 189, 190 (map), 197–204. 1987 Scleroconcha gallardoi Kornicker, 1971  —Hartmann: 117–118.

1988 Scleroconcha gallardoi Kornicker, 1971  —Hartmann: 143.

1989 Scleroconcha gallardoi Kornicker, 1971  —Hartmann: 235, pl. 3, Figs. 4–8View FIGURE 4View FIGURE 5View FIGURE 6View FIGURE 7View FIGURE 8. 1990 Scleroconcha gallardoi Kornicker, 1971  —Hartmann: 199.

1991 Scleroconcha gallardoi Kornicker, 1971  —Hartmann: 213.

Studied material (coordinates, depth and bottom see Appendix). R /V “Academic Fedorov”, 34 th Soviet (Russian) Antarctic Expedition, station 1, sample 8: MIMB 18281—adult female (length 3.79 mm).

52th Russian Antarctic Expedition, station 12, sample 65: MIMB 18276—adult female (4.25 mm), MIMB 18277—adult female (4.16 mm), MIMB 18278—adult female (4.07 mm), MIMB 1 8279—adult female (4.12 mm), MIMB 18280—adult female (4.10 mm), MIMB 18282—immature female (3.40 mm) and MIMB 18 283— immature male (3.26 mm), MIMB 18284a, b and c—adult females (3.81, 3.82 and 3.55 mm).

Additional material. See Appendix.

Diagnosis of adult female. Carapace. Length 3.60–4.35 mm. Carapace reticulate with rib along ventral and dorsal margins, rib lying just within antero-ventral valve margin and present only on anterior half of valve; middle rib extending full length of valve and lying dorsal to central muscle attachments; a lower rib extending almost full length of valve and lying below central muscle attachments. Surface of valves with scattered undivided setae.

Seventh limb. Each limb with 10 setae, 6 in distal group and 4 in proximal group. Terminally limb on comb with 9–17 bare teeth and 1 bare peg present on opposite comb.

Caudal furca. Each lamella with 15 or 16 claws; 3rd claw slender, subequal or slightly longer than 4th claw.

Bellonci organ. Organ elongate with about 22–29 segments at proximal part (include base) and middle.

Medial eye. Large and smooth.

Supplementary description of adult female. Carapace ( Fig. 12View FIGURE 12 A –J; Plate 2View PLATE 2 A –D). Length 3.60–4.25 mm (in literature: 3.76–4.35 mm). Shape, ribs and ornamentation of carapace similar to that of females illustrated by Kornicker (1975: Figs. 197, 201, 202). Middle rib lying below central muscle attachments straight in anterior half. Infold on rostrum with about 12–14 setae forming a vertical row. Antero-ventral inside with about 15 striations and about 20 minute setae in row ( Fig. 12View FIGURE 12 I). Surface of valves with scattered undivided setae ( Fig. 12View FIGURE 12 J).

First antenna ( Fig. 13View FIGURE 13 A, B). Joints 1 to 6 similar to those described by Kornicker (1971: 194). Seventh limb: a-seta somewhat longer than seta on sixth limb; b-seta with 2 proximal and 3 terminal filaments (in Kornicker 1971: 2 and 4 filaments, respectively); c-seta with 5 proximal and 5 terminal filaments; d- and e-setae bare and subequal; f-seta with 4–6 proximal and 5 terminal filaments ( Kornicker 1971: 6 and 4 filaments, respectively); gseta with 5 proximal and 5 terminal filaments; joint 2 to 5 with clusters of setules along ventral and dorsal margins.

Second antenna ( Fig. 13View FIGURE 13 C –F). Exopodite: first joint with minute elongate process on distal margin; distal margin joints 2–8 with spines in a row and with tiny basal spines; ninth joint with 7 setae consisting of 4 long and 3 short setae (one specimen of the South Shetland Islands with 6 setae). Endopodite 2-jointed: first joint with 4 or 5 proximal (one limb with aberrant proximal seta—Fig. 13 F) and 1 or 2 distal setae, proximal seta in proximal group longer than others; second joint with extremely long, spinous ventral seta barely reaching (or slightly not reaching) terminal margin of exopodite, short bare terminale (on limb it rises from a tubercle—Fig. 13 C, E).

Mandible ( Fig. 13View FIGURE 13 G, H). Basale with 8–9 ventral setae. Exopodite about 4/5 or 9/10 length of first endopodial joint. Endopodite: first joint with 4–5 ventral setae; dorsal margin of second joint with 5 setae in proximal group 6 setae in distal group and 1 seta between these groups, ventral margin 3–4 setae in subterminal group and 3 in terminal group. End joint with 4 setae and 3 claws.

Maxilla. Anterior of basale with minute short setae. First endopodial joint with 1α- and 5β-setae; second joint with 3a-setae (regular type), 2b-setae (claws), 3c-setae (regular type) and 2d-setae (claws). Endite I with 9 setae, endite II with 6 setae, endite III with 10 setae.

Fifth limb. Epipodial appendage with about 61 setae. Fourth plus fifth joints with 6 or 7 setae.

Sixth limb ( Fig. 14View FIGURE 14 E –G). Endite I with 3 terminal setae; endite II with 3 or 4 terminal and 1 medial setae; endite III with 8 terminal and 1 medial setae; endite IV with 8 or 9 terminal and 1 medial setae; end joint with 35– 46 setae; 4 or 5 setae present in place of epipodial appendage (one limb with 2 aberrant setae on end joint—Fig. 14 F).

Seventh limb ( Fig. 15View FIGURE 15 G). Each limb with 10 setae (3+3 distal and 2+2 proximal); each seta with 3–8 (usual 4– 7) bells. Terminal comb with 14 bare teeth (only with 13 on one and 17 teeth on other limb); single bare peg present on opposite comb.

Caudal furca. Each lamella with 15 or 16 claws (on left limb with 13 claws). 3rd claw more slender and subequal or slightly longer than 4th claw.

Bellonci organ ( Fig. 13View FIGURE 13 A). Organ elongate with about 22–27 segments at proximal part (base included).

Upper lip ( Figs. 12View FIGURE 12 K; 13 B). Ventrally hirsute.

Anterior process of body ( Figs. 12View FIGURE 12 K; 13 B). Process large and rounded.

Eggs: 2 specimens of King-George Island with 8 and 18 eggs in brood chamber.

Supplementary description of A- 1 male. Carapace ( Fig. 14View FIGURE 14 B, D). Length 3.21–3.26 mm. Shape and ornamentation similar, muscle attachments extending almost full length of valve (barely not reaching caudal process).

Second antenna ( Fig. 15View FIGURE 15 D –F). Endopodite: first joint with 4 subequal setae in proximal group and 1 distal seta; second joint with 1 extremely long spinous proximal seta and about 8 short bare setae in distal group on ventral margin ( Kornicker 1975: 10–12 distal setae); third joint with midlength bare dorsal seta and 2 short terminal setae.

Sixth limb. Endite I with 3 terminal setae; endite II with 3 terminal and 1 medial setae; endite III with 6–8 terminal and 1 medial setae; endite IV with 7 terminal and 1 medial setae; end joint with 27–32 setae; 3 setae present at place of epipodial appendage.

Seventh limb ( Fig. 15View FIGURE 15 H, I). Each limb with 8 setae, 4 (2+2) in proximal group and 4 (2+2) in distal group. Terminal comb with 3–4 bare teeth (=pegs) and 1 bare peg present on opposite comb.

Caudal furca. Each lamella with 13 claws.

Bellonci organ ( Fig. 15View FIGURE 15 B, D). Organ elongate, with about 17 segments (base unsegmented), distally spinous, tip rounded and with small terminal spines.

Description of A- 1 female. Carapace ( Fig. 14View FIGURE 14 A, C). Similar to that of adult female, but slightly elongated. Length 3.26–3.40 mm.

Second antenna. Ninth joint of exopodite with 6 terminal setae.

Caudal furca. Each lamella with 14 claws.

Distribution and ecology. Circumantarctic sublitoral-upper bathyal species. The species has been collected around almost all of the Antarctic continent between 53° and 77°S (as rule south of 60°S; Kornicker 1975): only 3 specimens were found in the Strait of Magellan— 53°49’18”S and 70°25’00”W ( Fig. 1View FIGURE 1). This species has been collected at depths of 4.5 to 458 m, in the temperature range of 1.21° to—0.92°C, on hard and soft substrates: rock, stone, gravel, sand, muddy sand, mud ( Kornicker 1971, 1975; Hartmann 1987a, 1988, 1989, 1990).

MIMB

Museum of the Institute of Marine Biology

Kingdom

Animalia

Phylum

Arthropoda

Class

Ostracoda

Order

Myodocopida

Family

Philomedidae

Genus

Scleroconcha

Loc

Scleroconcha gallardoi Kornicker, 1971

Chavtur, Vladimir G. & Keyser, Dietmar 2016
2016
Loc

Scleroconcha gallardoi

Kornicker 1971
1971
Loc

Scleroconcha gallardoi

Kornicker 1971
1971
Loc

Scleroconcha gallardoi

Kornicker 1971
1971
Loc

Scleroconcha gallardoi

Kornicker 1971
1971
Loc

Scleroconcha gallardoi

Kornicker 1971
1971
Loc

Scleroconcha gallardoi

Kornicker 1971
1971