title: Asymphylodora atherinopsidis (Trematoda: Monorchiidae) from the California grunion, Leuresthes tenuis, including a redescription.
abstract: Asymphylodora (Asymphylodoroides) atherinopsidis from the California grunion, Leuresthes tenuis, a new host record, and jacksmelt, Atherinopsis californiensis, the type host, is redescribed and illustrated using more symmetrical as well as larger and smaller specimens than the holotype. The geographic distribution is extended from the type locality of Stinson Beach, Marin Co., California to Estero Beach, 10 km south of Ensenada, Baja California Norte, Mexico. Two tubular externat seminal vesicles opening independently into the internal seminal vesicle are reported apparently for the first time in a trematode. The genital pore is at the left posterolateral margin of the acetabulum which is midway between the lateral margins. Worms may grow to a length of 5.6 mm but eggs were present in one specimen 1.3 mm long.
mesh_terms: D000818:Animals; D005399:Fishes / Q000469:parasitology*; D014200:Trematoda / Q000033:anatomy & histology / Q000145:classification*