Philomedes charcoti Daday, 1908

Chavtur, Vladimir G. & Keyser, Dietmar, 2016, Benthic myodocopid Ostracoda (Philomedidae) from the Southern Ocean, Zootaxa 4141 (1), pp. 1-70: 45-47

publication ID

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

publication LSID

lsid:zoobank.org:pub:6033C3F3-85B8-4665-A7AF-7C0E4B230ABC

persistent identifier

http://treatment.plazi.org/id/18659911-FF9D-C91E-FF08-B2A2FD40F87E

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Plazi

scientific name

Philomedes charcoti Daday, 1908
status

 

Philomedes charcoti Daday, 1908 

( Figs. 28View FIGURE 28 H –K, 29, 30)

1908 Philomedes charcoti Daday  ,: 9, Figs. 11View FIGURE 11, 12View FIGURE 12.

1912 Philomedes charcoti Daday, 1908  —Müller: 26 [key], 31.

1920 Philomedes charcoti Daday, 1908  —Skogsberg: 418.

1971 Philomedes charcoti Daday, 1908  —Kornicker: 171, Figs. 4View FIGURE 4, 5View FIGURE 5. 1975 Philomedes charcoti Daday, 1908  —Kornicker 236–238, Figs. 131, 133, 134, 135 (map). 1989 Philomedes charcoti Daday, 1908  —Hartmann: 234–235.

1991 Philomedes charcoti Daday,m 1908  —Hartmann: 212.

Studied material (coordinates, depth and sediment see Appendix). 52th Russian Antarctic Expedition, Prydz Bay, station 2, sample 43: MIMB 18303View Materials and 18 304— 2 adult females (2.02 and 2.05 mm). 

Station 2, sample 44: MIMB 18305—adult female (1.87 mm) and MIMB 1 8306—adult male (2.02 mm).

Station 10, sample 55: MIMB 18 307—immature male (1.72 mm).

Additional material. See Appendix.

Diagnosis of female ( Kornicker 1975, with additional remarks)

Carapace: with truncate posterior and rounded postero-ventral corner, surface distinctly reticulate, length 1.71–2.05 mm.

First antenna: 2nd joint with 2–3 setae, 1 ventral, 0–1 lateral and 1 dorsal.

Second antenna: 1st joint of endopodite with 6 setae, 5 proximal and 1 distal; 2nd joint with 1 long ventral and 1 long terminal seta.

Mandible: dorsal margin of basale with 3 setae, 1 near middle and 2 subterminal.

Sixth limb: epipodite with 2–3 setae.

Seventh limb: each limb with 15–18 setae, 4–5 distal and 10–13 proximal; 2 pegs present on opposite terminal comb.

Caudal furca: each lamella with 9 (rarely) or 10 claws, main claws short, stout, often with rounded tips.

Bellonci organ: 1- or 2-jointed, with pointed tip.

Lateral eye: elongate, with 2 ommatidia.

Anterior process (above upper lip): developed, with rounded tip.

Diagnosis of male. Carapace: length 2.20 mm.

First antenna: 2nd joint with 3 setae, 1 ventral, 1 lateral and 1 dorsal.

Second antenna: 1st joint of endopodite with 4–5 setae, 3–4 proximal and 1 distal; proximal seta of 3rd joint about 3/4 of its length.

Mandible: dorsal margin of basale with 3 setae, 1 near middle and 2 subterminal; coxale endite present.

Sixth limb: epipodite with 3 setae.

Seventh limb: each limb with 12–15 setae, 4–6 distal and 5–10 proximal; 2 pegs present on opposite terminal comb.

Caudal furca: each lamella with 8 or 9 claws.

Bellonci organ: 1-jointed, with rounded tip.

Anterior process (above upper lip): undeveloped and slightly rounded.

Supplementary description of adult female. Carapace. ( Fig. 29View FIGURE 29 A –C). Length 1.80–2.05 mm (in literature: 1.71–1.96 mm). Carapace with truncate posterior and rounded postero-ventral corner. Infold on rostrum with 10–11 setae forming a row and 3 setae near incisure. Antero-ventral inside with 12–13 striations and 1–9 setae. Infold on caudal process with 2–8 short setae. Carapace with distinctly reticulate pattern.

First antenna ( Fig. 29View FIGURE 29 E). Second joint with 3 setae, 1 dorsal, 1 lateral and 1 vertical.

Second antenna ( Fig. 29View FIGURE 29 F, G). Endopodite: first joint with 5 proximal and 1 distal setae; second joint with 1 long spinous ventral seta and 1 subterminal short bare seta.

Mandible ( Fig. 29View FIGURE 29 H). Basale: dorsal margin with 3 setae, 1 near middle and 2 subterminal; medial side with 6 setae, 3 pectinate and 3 usual type; lateral surface with 5 setae parallel to ventral margin; ventral margin usually with 2 distal setae. Endopodite: first joint with 4 ventral setae; dorsal margin of second joint with 2 setae in proximal group, 6 (rarely 5) setae in distal group and 1 seta between these groups; ventral margin with 2 setae in subterminal and 3 setae in terminal group.

Sixth limb. Endite I with 1 or 2 terminal and 1 medial setae, endite II with 3 terminal and 1 medial setae, endite III with 8 terminal and 1 medial setae, endite IV with 7 (rarely 6) terminal and 1 medial setae, end joint with 16–18 setae; 2 or 3 setae present in place of epipodial appendage.

Seventh limb. Each limb with 15–18 setae, 4–5 distal (usually 3+2 and rarely 2+2) and 11–13 proximal (5+6, 5+7 or 5+8) setae; each seta with 2–8 bells. Terminal comb with 12 teeth; 2 pegs present on opposite comb.

Caudal furca ( Fig. 29View FIGURE 29 I). Limb with 10+10 or 10+9 claws. Claws 1–4 stout and short.

Medial eye ( Fig. 29View FIGURE 29 D). Large, smooth.

Bellonci organ ( Fig. 29View FIGURE 29 D). Elongate, 2-jointed with pointed tip.

Upper lip ( Fig. 29View FIGURE 29 D). Ventrally hirsute, terminally with several glandular processes.

Anterior process on body ( Fig. 29View FIGURE 29 D). Developed, rounded.

Supplementary description of adult male. Carapace ( Figs. 29View FIGURE 29 J –L; 30 A): Length 2.20 mm. Carapace elongated and reticulated. Height subequal in anterior and posterior. Infold on rostrum with about 11 setae forming a vertical row and 2 setae placed near ventral margin of rostrum. Below incisure 1 minute seta is present. Anteroventral inside with 8 or 9 setae. Infold on caudal process with 3 or 4 spine-like minute setae.

First anten na ( Fig. 30View FIGURE 30 C, D). Second joint with 3 setae, 1 thick and long ventral seta and 1 lateral and 1 dorsal short normal type setae. Sensory seta of fifth joint evenly tapered from base to tip (without knee in middle) and with 4 terminal filaments ( Fig. 30View FIGURE 30 D).

Second antenna ( Fig. 30View FIGURE 30 E, F). Endopodite: first joint with 3 or 4 proximal and 1 distal setae; second joint with 2 muscle bands, one extends from first joint to posterior margin of third joint and another from middle of ventral margin of second joint to posterior margin of third joint ( Fig. 30View FIGURE 30 E); third joint with 4 terminal ridges (on both limbs); proximal seta about 4/5 length of this joint. Exopodite: distal margin of first joint bare; seta of second joint with 13 ventral spines ( Kornicker 1971: 24 spines); ninth joint with 4 long and 2 short setae.

Mandible ( Fig. 30View FIGURE 30 G –J). Coxale endite bifurcate above middle of its length ( Fig. 30View FIGURE 30 G, J) ( Kornicker 1971: bifurcate from base of endite). Basale: dorsal margin with 3 setae, 1 near middle and 2 subterminal; medial side with 6 setae, 3 pectinate and 3 normal type; lateral surface 4 setae parallel to ventral margin; ventral margin with 2 distal setae. Exopodite about 1/2 length of first endopodial joint or somewhat shorter. Endopodite: first joint with 4 ventral setae; dorsal margin of second joint with 2 setae in proximal group, 6 setae in distal group and 1 seta between these groups; ventral margin with 2 setae in subterminal and 3 setae in terminal group.

Sixth limb. Endite I broken, endite II with 3 terminal and 1 medial setae, endite III with 8 terminal and 1 medial setae, endite IV with 6 or 7 terminal and 1 medial setae, end joint with 13–14 setae; 3 setae present in place of epipodial appendage.

Seventh limb ( Fig. 28View FIGURE 28 J, K). Each limb with 13 setae (in literature: 12–15 setae), 4 distal (3+1) and 9 proximal (4+5) setae (in literature: 2+3 or 3+ 3 in distal group and 3+4 or 3+ 7 in proximal group). Terminal comb with 10 alate teeth ( Kornicker 1971: 13 teeth) and 2 pegs on opposite comb.

Caudal furca ( Fig. 30View FIGURE 30 K). Limb with 8+9 claws (in literature: 9+9 claws). Claws 1–4 relatively short.

Copulatory appendage ( Fig. 30View FIGURE 30 K). Organ very small, about ¼ length of lamella of furca (shorter than that in specimen described by Kornicker 1971).

Bellonci organ ( Fig. 30View FIGURE 30 B, C). Elongated, somewhat longer than first joint of first antenna, and with rounded tip.

Supplementary description of A- 1 male. Carapace. Length 1.72 mm.

First antenna. Second joint with 3 setae, 1 dorsal, 1 lateral and 1 ventral.

Second antenna ( Fig. 28View FIGURE 28 I). Endopodite: first joint with 4 proximal and 1 distal setae; second joint with 1 long spinous and 2 short bare ventral setae; third joint with 1 midlength dorsal and 2 short terminal setae.

Mandible. Basale: dorsal margin with 3 setae, 1 near middle and 2 subterminal; lateral surface with 4 setae parallel to ventral margin; ventral margin with 3 distal setae. Endopodite: first joint with 4 ventral setae; dorsal margin of second joint with 2 setae in proximal group, 6 setae in distal group and 1 seta between these groups; ventral margin with 2 setae in subterminal and 3 setae in terminal group.

Sixth limb. Endite I broken, endite II with 3 terminal and 1 medial setae, endite III with 8 terminal and 1 medial setae, endite IV with 7 terminal and 1 medial setae, end joint with 14 setae; 2 setae present in place of epipodial appendage.

Seventh limb. Each limb with 15 setae, 5 (3+2) in distal group and 10 (5+5) in proximal group; each seta with 2–5 bells. Terminal comb with 12 teeth; 2 pegs present on opposite comb.

Caudal furca ( Fig. 28View FIGURE 28 L). Limb with 9+9 claws. Claws 1–4 relatively stout and short.

Medial eye ( Fig. 28View FIGURE 28 H). Large, smooth.

Bellonci organ ( Fig. 28View FIGURE 28 H). Elongate, 2-jointed with pointed tip.

Upper lip ( Fig. 28View FIGURE 28 H). Ventrally hirsute, terminally with several glandular processes.

Anterior process on body ( Fig. 28View FIGURE 28 H). Developed, rounded.

Distribution and ecology. Antarctic sublitoral species. It was collected in the Scotia subregion of the Antarctic ( Daday 1908; Kornicker 1971, 1975; Hartmann 1989), Prydz Bay and near the Russian Polar station “Molodezhnaya” (present study) between 63° and 69°S ( Fig. 23View FIGURE 23) at the depths of 4.5 to 1135 m, on hard and soft substrates: rock, stone, gravel, sand and muddy sand.

MIMB

Museum of the Institute of Marine Biology

Kingdom

Animalia

Phylum

Arthropoda

Class

Ostracoda

Order

Myodocopida

Family

Philomedidae

Genus

Philomedes

Loc

Philomedes charcoti Daday, 1908

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

Philomedes charcoti

Daday 1908
1908
Loc

Philomedes charcoti

Daday 1908
1908
Loc

Philomedes charcoti

Daday 1908
1908
Loc

Philomedes charcoti

Daday 1908
1908
Loc

Philomedes charcoti

Daday 1908
1908
Loc

Philomedes charcoti

Daday 1908
1908