Zoological Studies

Vol. 57, 2018

(update: 2018.03.09)

On Argentodromas bellanella gen. nov., sp. nov. (Crustacea, Ostracoda) from a Stream in Northeastern Argentina (South America)

Analia Díaz1,* and Koen Martens2

1Instituto de Limnología Dr. Raúl A. Ringuelet (CCT-La Plata CONICET), Boulevard 120 y 62, 1900 La Plata, Provincia de Buenos Aires, Argentina
2Royal Belgian Institute of Natural Sciences, Freshwater Biology, Vautierstraat 29, Brussels 1000, Belgium and University of Ghent, Department of Biology, K.L. Ledeganckstraat 35, B-9000 Ghent, Belgium. E-mail: darwinula@gmail.com

(Received 5 July 2017; Accepted 21 February 2018; Communicated by Ryuji Machida)

Analia Díaz and Koen Martens (2018) Argentodromas bellanella gen. nov., sp. nov. is here described from streams in the province of Misiones, in northeastern Argentina. The new genus and species belong to the family Notodromadidae. Most species in the family have morphological adaptations to a hyponeustic mode of life: their carapaces have lip-like protrusions of the valve margins near the mouth and a flat plate-like expansion of the ventral part. The new genus can be distinguished from other genera in the subfamily Notodromadinae based on valve ornamentation (surface of valves covered with polygonal elevations and many pores with setae), the ventral plate-like expansion which is set with 3-4 rows of rounded elevations and bordered with an elevated outer list, eye tubercles softly pronounced, and soft parts features (male prehensile palps moderately asymmetrical and both with elongated first segments, posterior seta of caudal ramus longer than terminal claws and anterior seta present, hemipenis with rounded outer lobe and small rounded inner lobe). For comparative purposes, valves and carapaces of species in three other Notodromadinae genera (Newnhamia, Kennethia, Notodromas) are also illustrated and re-diagnosed.

Key words: Notodromadidae, New genus, Morphology, Argentina, Hyponeustic.

*Correspondence: E-mail: analiadiaz@ilpla.edu.ar; rcampos@ilpla.edu.ar