Tonnacypris glacialis ( Sars, 1890 )

Meeren, Thijs Van Der, Khand, Yondon & Martens, Koen, 2009, On Recent species of To n n a c y p r i s Diebel & Pietrzeniuk, 1975 (Crustacea, Ostracoda), with new species descriptions from Mongolia, Zootaxa 2015, pp. 1-41 : 28-29

publication ID

https://doi.org/ 10.5281/zenodo.185936

DOI

https://doi.org/10.5281/zenodo.5672700

persistent identifier

https://treatment.plazi.org/id/2F4087E3-F978-FFAA-3892-FB1EFF35FD9F

treatment provided by

Plazi

scientific name

Tonnacypris glacialis ( Sars, 1890 )
status

 

Tonnacypris glacialis ( Sars, 1890)  

( Fig. 18 View FIGURE 18 , 21 View FIGURE 21 , 22 View FIGURE 22 D–F)

Herpetocypris glacialis Sars, 1890   (p. 61; fig. 1)

Eucypris glacialis (Sars) Vávra, 1891  

Prionocypris glacialis (Sars) Brady & Norman, 1896   (figs. 50–68) Eucypris glacialis (Sars) Bronshstein, 1947   (p. 126; figs. 53, 54) Tonnacypris glacialis (Sars) Griffiths, 1995   (p. 523)

Material examined. Three dissected females from Svaldbard. Valves were completely decalcified and hence destroyed during dissection. Drawings of soft parts are included for OC.3027, 3028.

Additional description of female. For description and illustrations of valves, we refer to Griffiths et al. (1998). The material presented here was too decalcified to be able to give additional valve characters.

A 2 ( Fig. 18 View FIGURE 18 A) with reduced natatory setae, third seta the longest and reaching the basis of the terminal segment; z 1 a short setae, z 2 and z 3 long setae, G 1 and G 3 long claws, G 2 a short claw (about 1.6 times the length of the terminal segment); terminal segment with a long claw GM, shorter claw Gm, seta g, and aesthetasc y 3, with seta fused at the base with this aesthetasc.

Md palp with slender α-seta on the first segment, a strongly developed and serrated β-seta flanked by a group of four smooth seta on the second segment, and a long, serrated γ-seta on the penultimate segment ( Fig. 18 View FIGURE 18 C).

Mx 1 with seven (5 + 2) setae on the first segment of the palp, tooth bristles on the third endite serrated.

T 2 ( Fig. 18 View FIGURE 18 B) with seta d 1 reduced and seta d 2 of normal length.

CR ( Fig. 18 View FIGURE 18 D) with proximal seta slightly hirsute, proximally slightly enforced; distal half of the posterior side of the ramus set with about six setular fields, these fields slightly wider than in the other species of the genus (2 or 3 parallel rows of setulae instead of 1 or 2).

Measurements. Female: length = 1.56–1.68 mm (n = 3)

Remarks. Griffiths et al. (1998) gave a whole range of measurements for Recent and Pleistocene populations. Most of these measurements of adult (sub-) Recent specimens fall in the range of 1.40–1.75 mm for the length and 710–900 µm for the height. They also suggested that the presence of this species indicates mean summer (June–August) temperatures of about 6 ° C. Bronshtein (1947) reports carapace lengths of up to 1.6 mm.

Kingdom

Animalia

Phylum

Arthropoda

Class

Ostracoda

Order

Podocopida

Family

Cyprididae

Genus

Tonnacypris

Loc

Tonnacypris glacialis ( Sars, 1890 )

Meeren, Thijs Van Der, Khand, Yondon & Martens, Koen 2009
2009
Loc

Tonnacypris glacialis

(Sars) Griffiths 1995
1995
Loc

Eucypris glacialis

(Sars) Bronshstein 1947
1947
Loc

Prionocypris glacialis

(Sars) Brady & Norman 1896
1896
Loc

Eucypris glacialis (Sars) Vávra, 1891

(Sars) Vavra 1891
1891
Loc

Herpetocypris glacialis

Sars 1890
1890