Two new species of Hopperia (Nematoda, Comesomatidae) and Metachromadora (Nematoda, Desmodoridae) from Patagonia, Chubut, Argentina

Abstract

One new Comesomatidae species and one new Desmodoridae species from the Gulfs of San José and San Matías, Chubut province are described: Hopperia patagonica sp. n. is characterized by the shape of odontia on anterior end (one big and two smaller teeth on each); odontia length in relation to the amphid length; values of b and R3, short body length (L: 1370–1500 µm) and the de Man’s ratios ( b: 10.3–11.7). Metachromadora zaixsi sp. n. is characterized by the absence of pre-cloacal supplements, the presence of four cephalic setae and the de Man’s ratios (b: 4.7–7.2). Keys are provided for both species.