Stygodesmodora Blome, 1982

Larrazábal-Filho, Alexandre L., Neres, Patrícia F. & Esteves, André M., 2017, Four new species and an identification key for Stygodesmodora Blome, 1982 (Nematoda: Spiriniinae) from the continental shelf off northeastern Brazil, Zootaxa 4294 (1) : -

Genus Stygodesmodora Blome, 1982

Diagnosis. (emended from Leduc & Verschelde, 2015)

Cuticle with coarse annulations; numerous long somatic setae may be present; head region annulated (sometimes intraspecific variation present, with the head of some specimens only partially annulated in dorsal and ventral regions). Amphid unispiral to spiral, located on amphideal plate; buccal cavity small- to medium-sized, with dorsal tooth and (usually) smaller subventral teeth. Pharynx with rounded or pyriform posterior bulb, lumen may be bipartite. Precloacal supplements present or absent; spicules short, arcuate, with well-developed capitulum; gubernaculum present.

The diagnosis proposed by Leduc & Verschelde (2015) was expanded to include another feature, the bipartite lumen. This is a diagnostic feature at the species level. The term "simple lumen" is used throughout the text, to distinguish from "bipartite lumen". A simple lumen has only one section in the oesophagus, while a bipartite lumen has two sections.