Hapalorhynchus snyderi n. sp. and Hapalorhynchus tkachi n. sp. are described from the circulatory systems of the Malayan snail-eating turtle, Malayemys subtrijuga (Testudines: Geoemydidae) and the black marsh turtle, Siebenrockiella crassicollis (Testudines: Geoemydidae), respectively. Both of the new species are described from hosts in the family Geoemydidae, while previous species reported from Malaysia (Hapalorhynchus macrotesticularis and Hapalorhynchus rugatus) were described from soft-shelled turtles (Family Trionychidae). Both new species can be differentiated from H. rugatus Brooks and Sullivan (1981) in that they lack the rugae on the hindbody that is characteristic of H. rugatus. Hapalorhynchus snyderi n. sp. is most similar to H. macrotesticularis (Rohde, Lee, and Lim, 1968) but is much smaller and differs from that species in a suite of morphometric criteria. In addition, H. snyderi possesses intestinal cecae that are simple and straight while the cecae in H. macrotesticularis are highly sinuous, particularly in the posttesticular region. Hapalorhynchus tkachi n. sp. can be differentiated from H. snyderi by its much smaller size (<1 mm in total length), the presence of a distinct constriction at the level of the acetabulum, and the more-posterior location of the ventral sucker.
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Vol. 79 • No. 2