Keysercypria, Karanovic, 2011

Karanovic, Ivana, 2011, On the recent Cyclocypridinae (Podocopida, Candonidae) with description of two new genera and one new species 2820, Zootaxa 2820 (1), pp. 1-61 : 23-24

Keysercypria gen. nov.

Diagnosis. Carapace usually ovoid in lateral view. LV overlaps RV ventrally, anteriorly and posteriorly. RV sometimes overlapping LV dorsally. Surface of carapace smooth, sometimes covered with long setae. Selvage peripheral anteriorly on both valves and sometimes inwardly displaced on RV. Marginal tubercles along the margins present or absent. A1 7-segmented. A 2 in male 5-segmented, penultimate segment divided and with t2 and t3 setae transformed into sexual bristles. A2 sexually dimorphic: G1 and G3 claws in males reduced, z1 and z2 setae transformed into claws, z1 being shorter, while z3 seta-like and exceeding tips of terminal claws. Five long swimming seta, the most external seta completely reduced. Terminal segment of Md-palp elongated, more than 5 times longer than wide. Terminal segment of Mxl palp square. Prehensile palps asymmetrical. T2 without basal seta. Basal segment of T3 without d2 seta. Setae “e”, “f” and “g” very short. Seta “h1” at least two times shorter than seta “h2”, seta “h3” very long. UR with all setae and claws present and normally developed. Hemipenis with two lobes “a” and “b” well developed, and positioned far apart from each other. Lobe “a” often having a rounded, boxing glovelike distal end. Zenker organ with 7 whorls of spines. Genital field rounded.

Type species: Cypria affinis ( Klie, 1933) (here designated).

Other species. K. circinata ( Würdig & Pinto, 1993) comb. nov.; K. deformis ( Klie, 1940) comb. nov.; K. longiseta ( Klie, 1930) comb. nov.; K. obtusa ( Klie, 1940) comb. nov.; K. pellucida (Sars, 101) comb. nov.; K. sanctaeannae ( Margalef, 1961) comb. nov.; K. schubarti ( Farkas, 1958) comb. nov.; K. xanabanica (Furtos, 1936) comb. nov.

Etymology: The genus is named after Dr Dietmar Keyser from the ZMH, as an acknowledgment of his contribution to the taxonomy and physiology of Ostracoda and the great support he gave me during this study.

Remarks and affinities. The genus is very easily distinguished from all other representatives of the subfamily Cyclocypridinae by the chaetotaxy of T3, i.e. the absence of the d2 seta, very short setae “e”, “f” and “g” and a clear difference in the length of “h1” and “h2” setae. Those two setae are of the same length in all other genera of the subfamily, and sometimes in Physocypria Vávra, 1897 and Cypria Zenker, 1854 the seta “h2” may be slightly longer than seta “h1”, but never as much as in Keysercypria gen. nov. Cypria brevisetigera Cole, 1965 lacks the seta d2 on the T3 and it also has a prominent difference in the L of two “h” setae, but not as much as in the species of the new genus. Also, the setae “e”, and “f” are long in C. brevisetigera and the hemipenis is also very different. The absence of a seta on the basal segment of T2 distinguishes the new genus from Physocypria , Cyclocypris Brady & Norman, 1889 , Allocypria Rome, 1962 , and Kempfcyclocypris gen. nov. The square shaped terminal segment on T3 and the appearance of the hemipenis more closely relate Keysercypria to Cypria Zenker, 1854 ; Allocypria Rome ; 1962, and Physocypria Vávra, 1897 than to Cyclocypris Brady & Norman, 1889 and Kempfcyclocypris . However, in those closely related genera, lobes on hemipenis are situated very close to each other, and they have pointed distal ends, while in the new genus the lobes are situated far apart and lobe “a” has a rounded, boxing glove-like distal end. Keysercypria has yet another characteristic that separates it from all representatives of the subfamily, and that is the absence of the most external of the swimming setae on the A2. The only species not included in the key is K. schubarti ( Farkas, 1958) because it is very difficult to distinguish it from K. affinis . Both species have very similar carapace shapes and appearances of hemipenis and prehensile palps, so it might even be proven in the future that K. schubarti is a junior synonym of K. affinis .

Distribution. The genus is endemic to South and Central America ( Figure 11 ).

Figures

FIGURE 11. Distribution of the genus Keysercypria gen. nov. 1—K. affinis (Klie, 1933); 2—K. circinata (Würdig & Pinto, 1993); 3—K. deformis (Klie, 1940); 4—K. longiseta (Klie, 1930); 5—K. obtusa (Klie, 1940); 6—K. pellucida (Sars, 1901); 7—K. sanctaeannae (Margalef, 1961); 8—K. schubarti (Farkas, 1958); 9—K. xanabanica (Furtos, 1936).