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Very little is known about the ecology and biology of Drymaeus tripictus, an extremely rare andendemic land snail species from Costa Rican highlands. I studied the ecology and reproductive biology of D. tripictusfrom April 2009 through June 2010 in an old forest, a young forest and a Cupressus lusitanica plantationin central Costa Rica. Every three months I visited each habitat and collected specimens in 20 random samplingplots (3x3 m2 each). I observed the snail’s activity and microhabitat preference in the field, and in the laboratoryI recorded high definition videos of its mating behavior and analyzed reproductive morphology with lightmicroscopy. The snail is more abundant in the old forest (0.017 ind./m(2)) and prefers leaves with little epiphyllouscover (0-25 % cover, chi-square test, p <0.0001). During the dry season the snails become active between 20:00pm and 8:00 am (chi-square = 22.65, df=3, p < 0.0001); they are inactive mainly during the afternoon (11:00 amto 16:59 pm). I found active individuals mostly on the upper side of leaves, where they feed (Chi-square =6.76,df=1, p = 0.0093). Mating is unilateral, by shell mounting, with cryptic phallus intromission and without roleswitching or multiple mating. Its reproductive system is morphologically similar to that of Drymaeus costaricensis.Mating behavior is as expected for snails with high-spired shells, except for the lack of role switching.The density of D. tripictus is low even when compared with other endangered bulimulids.

revista de biología tropical

Sistema reproductivo, comportamiento de apareamiento y ecología básica de un caracol tropical extremadamente raro: Drymaeus tripictus (Stylommatophora: Bulimulidae)