Pleioplana delicata (Yeri & Kaburaki, 1918)

Fig. 5C

Notoplana delicata Yeri & Kaburaki, 1918: 13–15, figs 11–13, pl. II, fig. 14.

Pleioplana delicata – Faubel 1983: 117.

Type locality

JAPAN: Misaki.

Description

Body shape elongated. Cryptic colour. Translucent dorsal appearance. Longitudinal median line highlighted by concentration of spots. Heterogeneous mottled background with spots and dots. Smooth dorsal surface. Nuchal tentacles absent. Tentacular knobs present. Marginal eyes absent. Tentacles absent; instead tentacular eyes present in rounded and compact clusters. Dorsal and ventral frontal eyes absent. Cerebral eyes in two clusters. Pharynx located in second or last body third, strongly ruffled and ventrally oriented. Oral pore position in second body third and in posterior region of pharynx. Intestine with numerous branches without anastomosis. Intestinal vesicles absent. Gonopores clearly separated.

MALE REPRODUCTIVE SYSTEM. Single male pore. Male apparatus not enclosed within muscular bulb, oriented backwards and located in last body third. Ejaculatory duct with straight stylet. Prostatic vesicle interpolated. Connection between ejaculatory duct and prostatic vesicle with projection. Internal glandular lining of prostatic vesicle with tubular chambers. Extravesicular prostatic secretion. Prostatic glands located at proximal end of prostatic vesicle. Seminal vesicle simple or spindle-like. Spermiducal bulbs present.

FEMALE REPRODUCTIVE SYSTEM. Vagina elongated, tube-like, looping towards male complex. Enlarged Lang’s vesicle. Paired uterus. Uterine vesicles absent. Tube-like cement chamber. Endolecithal eggs.

Biology

Found along the coast during the low tide.

Distribution

Shirahama (Prov. Awa), Japan.