Malacobdella arrokeana (Nemertea: Bdellonemertea), a new species of nemertean from the Southwestern Atlantic Ocean entocomensal in Panopea abbreviata (Bivalvia, Heterodonta, Hiatellidae) in Argentina.

IVANOV, V. A.; BIGATTI, G.; PENCHASZADEH, P. E.; NOREMBURG, J. L.

Proceedings of the Biological Society of Washington

SMITHSONIAN INST. PRESS

Lugar: WASHINGTON; Año: 2002 vol. 115 p. 359 - 367

MalacobrleIla arrokeann, a new species of entocommensal nemerteanis described from the mantle cavity of the bivalve Parzopea abbr-eviatain Argentine waters. This discovery expands the distribution of the genus,including the Southern Hemisphere for the first time, and represents a new hostrecord. Malacobdella ar-rokearza can be differentiated from all other species inthe genus by the following combination of characters: worm size, length ofrhynchocoel, proboscis and retractor muscle of proboscis, gonad distributionand coloration, and position of excretory pores.