Zoological Studies

Vol. 54, 2015

A new species of Notogynaphallia (Platyhelminthes, Geoplanidae) extends the known distribution of land planarians in Chacoan province (Chacoan subregion), South America

Lisandro Negrete1,2, Ana Maria Leal-Zanchet3 and Francisco Brusa1,2*

1División Zoología Invertebrados, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Boulevard 120 and 61, La Plata, Argentina
2Instituto de Pesquisas de Planárias, Universidade do Vale do Rio dos Sinos, 93022-000 São Leopoldo, Rio Grande do Sul, Brazil
3Instituto de Pesquisas de Planárias and Programa de Pós-Graduação em Biologia, Universidade do Vale do Rio dos Sinos, 93022-000 São Leopoldo, Rio Grande do Sul, Brazil

Background: The subfamily Geoplaninae (Geoplanidae) includes land planarian species of the Neotropical Region. In Argentina, the knowledge about land planarian diversity is still incipient, although this has recently increasedmainly in the Atlantic Forest ecosystem. However, other regions like Chacoan forests remain virtually unexplored.
In this paper, we describe a new species of the genus Notogynaphallia of the Chacoan subregion. This species is characterized by a black pigmentation on the dorsum and a dark grey ventral surface. The eyes with clear halos extend to the dorsal surface. The pharynx is cylindrical. The main features of the reproductive system involve testes anterior to the ovaries, prostatic vesicle intrabulbar (with a tubular proximal portion and a globose distal portion) opening broadly in a richly folded male atrium, common glandular ovovitelline duct and female genitalcanal dorso-anteriorly flexed constituting a “C”, female atrium tubular proximally and widening distally.
Conclusions: This is the first report of the genus Notogynaphallia in Argentina (Chacoan subregion, Neotropical Region) which increases its geographic distribution in South America. Also, as a consequence of features observedin species of the genus, we propose an emendation of the generic diagnosis. 

Key words: Land flatworms; Notogynaphallia; Geoplaninae; Argentina; Chacoan subregion; Neotropical Region.

*Correspondence: E-mail: fbrusa@fcnym.unlp.edu.ar