Neocypridopsis albida ( Sars, 1901 ) Sars, 1901

Karanovic, Ivana & Datry, Thibault, 2009, Overview of Candoninae (Crustacea, Ostracoda) of South America and the West Indies, with the description of two new species and one new genus, Zootaxa 2267, pp. 1-25 : 17-19

Neocypridopsis albida ( Sars, 1901) comb. nov.

( Figure 8 )

Material examined: Two females (on one slide ZMO 11572 Mp. 498) from Brazil, Sao Paolo.

The slide containing this species was in a very poor condition and dissected animals were very difficult to observe. Therefore we provide only a limited number of drawings and a short description, which is based on the animals examined, but which nevertheless shows the correct systematic position of the species.

Description. Posterior end of RV ( Figure 8 D): with prominent inwardly displaced selvage and inner list.

A1 ( Figure 8 B): 7-segmented. Third segment with one posterior seta which short, and not reaching distal end of following segment. Fourth segment with two long anterior setae; fifth segment with two long anterior setae and one short posterior seta. Sixth segment with three long and one short seta. L ratio of last 6 segments 2.4: 1.8: 1: 1: 1: 1.4.

A2 ( Figure 8 A): swimming setae short, reaching at most middle of penultimate segment. All t-setae developed, t1 being the shortest. Only two z-setae (z1and z2 or z2 and z3) observed, both being seta-like and reaching middle of terminal claws. All distal claws, except Gm long, but shorter than first endopodal segment. Only Y observed and not reaching distal end of first endopodal segment. L ratios of endopodal segments 5.7: 3.2: 1.

Mxl ( Figure 8 C): terminal segment of Mxl palp elongated, almost two times longer than wide. First segment with two bare setae; second segment with one claw and three setae. Claws on third Mxl endite smooth.

T2 ( Figure 8 F): Basal segment with one seta (d1). First, second and third endopodal segments with one seta each. Setae on endopodal segment very long, each being almost two times longer than bearing segment. Terminal segment with one short seta and a claw. Claw curved and 1.4 times longer than three distal segments combined.

T3 ( Figure 8 G): Basal segment with two setae (dp and d2). First and second endopodal segments with one seta each, seta on second endopodal segment positioned medially. Terminal segment not pincer shaped. Seta h2 claw like. L ratios of three setae on terminal segment 1: 1.6: 1.8.

CR ( Figure 8 E): cylindrical and reduced. Trunk with one short lateral seta and one distal whip-like seta.

Remarks. Neocypridopsis albida ( Sars, 1901) was originally assigned to the genus Paracypridopsis Kaufmann, 1900 , which was subsequently synonymized with the genus Potamocypris Brady, 1870 . Sars (1901) had described the species from a mud sample from Sao Paolo. Without discussing, Martens & Behen (1994) transferred the species to the genus Danielocandona Broodbakker, 1983, a Candoninae genus. While working on the revision of the subfamily Candoninae , the senior author borrowed the type material of the species from the Zoological Museum in Oslo. The presence of swimming setae on the second antenna undoubtedly excludes the species from the subfamily Candoninae , while a reduction of the caudal ramus is unknown for the other two Candonidae subfamilies, Cyclocypridinae and Paracypridinae . Also, the morphology of the terminal segment of T3 as well as length ratio of the three setae (h1, h2 and h3) is different in both these Candonidae subfamilies. Namely, the terminal segment is more elongated and seta h3 is much longer and setae h2 and h1 are about same length. Neocypridopsis albida has a T3 terminal segment not forming a pincer, which is atypical for the entire family Cyprididae with only rare exceptions, these being Neocypridopsis Klie, 1940 and Neozonocypris Klie, 1944. The latter genus is characterized by ornamented carapaces and a conspicuous caudal ramus, which is conical in shape and without clearly separated terminal setae ( Klie 1944) – features which do not apply to the species albida . Therefore the here considered Brazilian species should belong to the genus Neocypridopsis , described by Klie (1940) from North Brazil.

Figures

FIGURE 8. Neocypridopsis albida (Sars, 1901): Female (ZMO, 11572 Mp. 498): A, A 2; B, A 1; C, Mxl palp and the first endite; D, posterior margin on the RV; E, caudal ramus; F, T 2; G, T 3. Scale = 0.1 mm.