Listriolobus Spengel, 1912

Nishikawa, Teruaki & Arase, Ikue, 2019, Ephemeral Occurrence of the Echiuran Listriolobus brevirostris (Annelida: Echiura) in Osaka Bay between 1995 and 2002; a New Record for Japan, Probably Resulting from Human-mediated Introduction, Species Diversity 24, pp. 151-158 : 153

Genus Listriolobus Spengel, 1912

Diagnosis [based on Nishikawa (2004); emended by Tanaka et al. (2014)]. Longitudinal muscle of body wall grouped into bands (at least in adults); inner-most oblique muscles continuous, never separated into fascicles between longitudinal muscle bands; one to three pairs (often with some anomalies) of gonoducts, their gonostomes located proximally; gonostomal lips elongated, often coiled spirally; interbasal muscle present or absent; rectal caecum present.