The complexity of food manipulation and transport behaviors in H. concavum rivals that of mating and egg laying in land snails. James W. Atkinson Sperm ultrastructure and spermathecal structure in Amphiglena spp. Mona Island, a small uninhabited Caribbean island between Puerto Rico and Hispaniola, was surveyed for freshwater platyhelminths. Rainwater pools on the island's plateau produced two species of Typhloplanidae, a species close to Mesostoma georgianum and a new species of Mesostoma, M. tubiseminalis , herein described. The new species is diagnosed by the presence of a tubular receptaculum seminis that forms a distinct bifurcation of the female tract.
Pools inhabited by both species are subject to high pH, high temperatures, and rapid evaporation.
While M. cf. Inc. Food manipulation and transport by a carnivorous land snail, Haplotrema concavum James W. Atkinson Department of Zoology, Michigan State University, East Lansing, MI 48824, USA Abstract . When offered an egg of the land snail Anguispira alternata , the carnivorous land snail Haplotrema concavum manipulates it, rotating the egg with its foot and rubbing its mouth on the surface of the egg shell. Consumption of young hatchlings of other snail species involves a similar manipulation and transport of the prey. Inc. Sperm ultrastructure and spermathecal structure in Amphiglena spp.