Synasterope, Poulsen, 1965

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 : 319-320

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.5610358

persistent identifier

https://treatment.plazi.org/id/803C111A-D24C-AF71-DD96-FB6017E68297

treatment provided by

Plazi

scientific name

Synasterope
status

 

Genus SYNASTEROPE Poulsen, 1965 View in CoL

Type-species. Synasterope implumis Poulsen, 1965

Composition. The genus Synasterope includes 34 species of which the following are known from the study area ( Fig. 20 View FIGURE 20 ): S. bassana Poulsen, 1965 , S. mystax Kornicker, 1975 , S. brachythrix Kornicker, 1975 , S. polythrix Kornicker, 1975 , S. empoulseni Kornicker, 1975 , S. duplex Kornicker, 1975 , S. arnaudi Kornicker, 1975 , S. dimorpha ( Hartmann, 1965) , S. solox Kornicker, 1996 , S. species 129 Hartmann, 1990.

Distribution. Members of this genus live between 44°– 45°N ( Chavtur 1983) and 75°– 76°S ( Kornicker 1975) and a depth range of 1–4450 m.

1. Lateral eyes present.................................................................................... 2

- Lateral eyes absent.................................................................................... 3

2. 2 or 3 midsetae on dorsal margin of mandibular basale.............................................. S. empoulseni View in CoL

- Without midseta on dorsal margin of mandibular basale............................................... S. bassana View in CoL

3. Ventral margin of basale of maxilla with 5 proximal setae...................................................... 4

- Ventral margin of basale of maxilla with 1 proximal seta....................................................... 5

4. Seventh limb with 18–22 setae................................................................... S. polythrix View in CoL

- Seventh limb with 12 setae........................................................................ S.duplex View in CoL

5. Length more than 2.2 mm ............................................................................... 6

- Length less than 2.2 mm ................................................................................ 7

6. Length more than 3.0 mm, 1st segment of endopodite on 2nd antenna shorter than 2nd segment, endite of mandible basale with 3 spinous and 3 triaenid setae......................................................... S. pseudomystax View in CoL sp. nov.

- Length less than 3.0 mm, 1st segment of endopodite on 2nd antenna subequal length of 2nd segment, endite of mandible basale with 4 spinous and 4 triaenid setae................................................................. S. mystax View in CoL

7. e-seta on 8th segment of 1st antenna about same length or shorter than a-claw of 7th segment; medial seta on protopodite of 2nd antenna absent.......................................................................... S. brachythrix View in CoL

- e-seta on 8th segment of 1st antenna longer than a-claw of 7th segment; medial seta on protopodite of 2nd antenna present.. 8

8. Length of ventral margin of 6th segment of 1st antenna of female less than 60 percent of distance between base of sensory seta and base of proximal filament on sensory seta; 8 processes on posterior infold of carapace................... S. dimorpha View in CoL

- Length of ventral margin of 6th segment of 1st antenna of female more than 70 percent of distance between base of sensory seta and base of proximal filament on sensory seta; 3–5 processes on posterior infold of carapace...................... 9

9. 4–5 processes on posterior infold of carapace; 5–6 setae forming row between ventral part of posterior ridge and posteroventral valve margin.................................................................................. S. arnaudi View in CoL

- 3 processes on posterior infold of carapace; over 40 setae forming row between ventral part of posterior ridge and posteroven- tral valve margin................................................................................. S. solox View in CoL

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