Rogneda capulata, KARLING, 1953

Artois, Tom J., 2008, Revision of Rogneda Uljanin, 1870 (Rhabditophora, Eukalyptorhynchia, Polycystididae) with the description of seven new species, Zoological Journal of the Linnean Society 153 (1), pp. 1-28 : 5

THE CAPULATA -GROUP

The capulata -group includes two species from the Mediterranean with two dorsal pigment stripes and an aberrant construction of stylet A: R. exilis ( Figs 3A , 4C, D ) and R. capulata ( Fig. 3B ). The relationship between these two species has already been discussed by Brunet (1979). The distal part of stylet A consists of at least two plates: a hook-shaped ( R. exilis ) or rectangular ( R. capulata ) one, and a broader oval one, with a serrated distal rim. In R. capulata there is a third (and possibly even a fourth) plate, which is (are) also oval and with a serrated distal rim, but somewhat longer. In R. exilis the hook-shaped plate has a proximal extension, lying parallel to the proximal plate of the stylet. Therefore, this plate could be homologous with plate A2 of the other species of Rogneda (see the remarks on R. exilis in the taxonomical account). This extension may also be present in R. capulata , but this cannot be determined with certainty because of the poor orientation of the stylet in the specimens available. In this species, the other two (three?) plates are thus probably subdivisions of plate A1. Stylet B of both species is very simple, with a long and narrow plate B1 and a simple, shorter plate B2. Plate B2 is attached to the proximal part of B 1 in R. capulata , probably around its midpoint in R. exilis . Another feature that points towards a close relationship between these two species is the caudal position of the testes, which is almost unique within the Eukalyptorhynchia.

Figures

Figure 3. Stylets of the representatives of the capulata- and the falcata-group. A, R. exilis (from the holotype). B, R. capulata (from the lectotype). C, R. falcata (from the holotype). D, R. acuta (from the holotype). Stylet A is indicated by an A, stylet B by a B. Plates B1 and B2 are indicated by a 1 and a 2, respectively. Scale bar = 25 Mm.

Figure 4. Stylets of R. minuta and of representatives of the capulata- and falcata-group. A, B, R. minuta (A from the neotype; B specimen from Marseilles). C, D, R. exilis [C, stylet B; D, stylet A (both from the holotype)]. E, F, R. acuta [E, stylet A; F, stylet B (both from the holotype)]. G, R. falcata (from a specimen from Marseilles). Scale bars = 20 Mm.