New species of Archilina Ax 1959 (Platyhelminthes Proseriata) from the Red Sea and the Caribbean

Abstract

Four new species of the genus Archilina Ax 1959 are described from tropical areas: A, euglypta n. sp. and A. batiae n. sp. from Red Sea; A. stylifera n. sp. and A. opisthobursa n. sp. from the Caribbean (Puerto Rico). The karyotypes of all species are given: three of them have karyotypes derived from the basic set of the family Monocelididae. A sister-species relationship is proposed for the Caribbean species based on the backward position of the bursa. Because of this feature, the genus diagnosis is modified. The two Caribbean species are considered as a separate evolutionary line within the genus Archilina.