Gieysztoria chiqchi Damborenea, Brusa & Noreña, 2005

João A. L. Braccini, Francisco Brusa & Ana M. Leal-Zanchet, 2017, Six freshwater microturbellarian species (Platyhelminthes) in permanent wetlands of the Coastal Plain of southern Brazil: new records, abundance, and distribution, Check List 13 (6), pp. 849-855 : 854

Gieysztoria chiqchi Damborenea, Brusa & Noreña, 2005

Figs 12–13A, B

General morphology. Ovoid body (to 1 mm), whitish with dark spots; anterior tip truncated and posterior tip pointed ( Figs 12, 13A ). Mouth located antero-ventrally; pharynx barrel-shaped. Male copulatory organ with sclerotized stylet, about 170 µm long, with a completely fibrous girdle and 10 spines of different sizes ( Fig. 13B ). The arrangement, number, and size of spines of the sclerotized stylet, as well as the morphology of its fibrous girdle are identical to these of the type specimens.

Specimens examined. MZU 00207: coll. J.A.L. Braccini and F. Brusa, 26 March 2012, Brazil, Rio Grande do Sul, Capivari do Sul (30°10ʹ22ʺ S, 050°23ʹ10ʺ W) ; coll. J.A.L. Braccini and G.G. Iturralde, 27 September 2012, Brazil, Rio Grande do Sul, Osório ( Wetland 2) (29°53ʹ20ʺ S, 050°08ʹ09ʺ W).

Remarks on ecology and distribution. This species had a high abundance in the summer/autumn survey, but most of them were dead during the sample analysis, probably due to some disturbance shortly before the survey in Capivari do Sul. It showed low abundance in the summer/ autumn survey in Osório ( Table 2 ). Gieysztoria chiqchi was previously recorded only for its type locality, in the department of Loreto, Peruvian Amazon ( Damborenea et al. 2005). Thus, the present record is the first for Brazil and represents an increase of the known distribution of this species of about 3800 km to the southeast.

Figures

Figures10–13.Photographs of specimensinvivoafter squeezepreparation (10,12)and diagrammaticreconstructions (11, 13) in dorsal viewofspeciesofDalytyphloplanidarecordedfortheCoastalPlainofsouthernBrazil.10,11.Baicalelliaevelinae.12,13.Gieysztoriachiqchi. Detailsofthepenisstyletareshownin11Band13B.