Two new species of south Korea with remarks on the Family Stilochidae (Acotylea, Polycladida, Platyhelminthes)

BULNES, FAUBEL, PARK

JOURNAL OF NATURAL HISTORY

Taylor & Francis Group

Año: 2005 p. 2089 - 2107

0022-2933

Two new species of acotylean Polycladida are described from Korea, Munseoma maculata gen. et sp. nov. and Crytostylochus koreensis sp. nov. Munseoma maculata is characterized by a small free prostatic vesicle but only indistinctly cut off from the ejaculatory duct; a Lang’s vesicle is present. Crytostylochus koreensis possess a prostatic vesicle with tubular lining of radial arrangement. Each tube is connected via a glandular duct with a single extra-vesicular gland attached just to the muscular wall of the prostatic vesicle. That morphological feature forces to discuss the relationships within the family Stylochidae. Consequently, type material of other stylochids deposited in the museums of Hamburg, Vienna, and Stockholm, was ordered to investigate the genital organs and, in particular, the interior lining of the prostatic vesicle. Based on that analyses two new types of the prostatic lining are defined, the poly-glandular type and the mono-glandular type. The mono-glandular type is defined having an oval to elongate prostatic vesicle with tubular lining and extra-vesicular glands. Each extra-vesicular gland is connected via a glandular duct with a single tube. The poly-glandular type is defined having a mostly roundish oval prostatic vesicle with long fingered tubes, more or less horizontally directed distad, and numerous extra-vesicular glands. Each tube is connected via several glandular ducts of  extra-vesicular glands. Based on these new characters, the family Stylochidae is newly defined.