Baicalellia evelinae Marcus, 1946

Figures 10, 11A, B

General morphology. Body 3 times longer than wide (body length to 0.6 mm), with rounded anterior and posterior tips (Figs 10, 11A). The pharynx measures up to 0.15 mm and shows pharyngeal tentacles forming an inverted cone towards the mouth. The male reproductive system consists of a pair of testes, a spherical seminal vesicle, and a C-shaped penis. The latter is constituted by a sclerotized tube, about 50 µm long, with a broad basis, gradually narrowing towards the tip (Fig. 11B). The female reproductive system shows a “bursa seminalis” located between the ovaries, and the uterus with an intestinal connection. The uterus contained 2 egg capsules, each with 2 eggs (Fig. 11A).

Specimens examined. MZU 00206: coll. J .A.L. Braccini and F . Brusa, 26 March 2012, Brazil, Rio Grande do Sul, Tramandaí (30°05ʹ09ʺ S, 050°10ʹ24ʺ W) .

Remarks on ecology and distribution. This species had moderate abundance in the winter/spring survey but was absent in the summer/autumn survey (Table 2). Baicalellia evelinae was previously reported from 3 localities in the state of São Paulo (Marcus 1946). The current record represents a southeastern range extension of about 800 km.