Anguina plantaginis n. sp. Parasitic on Plantago aristata with a Description of Its Developmental Stages

摘要

Anguina plantaginis n. sp., parasitic on Plantago aristata, is described and illustrated. This new species is most closely related to A. klebahni, A. millefolii, A. mobilis, and A. moxae and is characterized as follows: moderate body size for the genus; absence of esophageal "storage organ"; postvulval uterine sac extending about 45% of vulva-anus distance; crustaformeria of young females longer than spermatotheca or uterus proper; spicules with 2 sclerotized thickenings; long, conical tail in both sexes, narrowing at about 1/6 of its length to peg-like tip; parasitic only on P. aristata. Two nematode generations that are morphologically similar but differ in body size develop in one plant gall. The postembryogenesis, studied with respect to morphological development of the larval stages, is similar to that of Ditylenchus. The sexes can be differentiated from the second molt on. The infective larva is the third stage, which is morphologically distinct from the regularly developing third-stage larva.