Drymaeus tripictus
Drymaeus tripictus is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Bulimulidae. [1]
| Drymaeus tripictus | |
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| Drymaeus tripictus | |
| Scientific classification | |
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| (unranked): | clade Heterobranchia clade Euthyneura clade Panpulmonata clade Eupulmonata clade Stylommatophora clade Sigmurethra |
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| Species: | D. tripictus |
| Binomial name | |
| Drymaeus tripictus Albers, 1857 | |
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Specimens vary in color patterns, but can be identified by their ventricose shape, broad bands of spots and an apex and peristome of bright rose coloration.[2] Some specimens have white or translucent dots on the body whorl.[3]
Similar species
The reproductive system of D. tripictus, and Drymaeus costarricenses are similar, suggesting these species are closely related.[4] Two other species - Drymaeus irazuensis and Drymaeus gabbi - also have bright rose coloured peristomes, but there is no description of their reproductive apparatus in the scientific literature, therefore the taxonomic relationship is not certain yet.[3]
Distribution
D. tripictus is an extremely rare land snail species. This snail is endemic from the central Costa Rican highlands between an altitude of 1300-1700 m. [2][5]
Ecology
These snails are more active during the night and until early morning. D. tripictus likely feed on algae and cyanobacteria present on moss or lichen. They can be found in the shrubs and understory of the forest. The species is more abundant in the primary forest (0.017 individuals/m2) than in secondary forests (0.001 individuals/m2).[3]
Reproduction
As all other members of this family, D. tripictus has an hermaphrodite reproductive system, meaning one specimen has both male and female genitalia.
The mating process is by shell mounting, where the male acting individual slides on top of the female acting individual, followed by multiple stimulatory activity, where the radula of the male acting individual scrapes the shell and the mantle collar of the female acting individual. Finally the male acting individual turns its head, allowing contact between the gonopores, but the phallus is not everted. This process takes between 60-75 minutes and no role switching takes place. Hatching occurs between June and July.[3] This is the only description available for a species of the genus Dryameus.
References
- MolluscaBase eds. (2020). MolluscaBase. Drymaeus tripictus (Albers, 1857). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=1065142 on 2020-09-20
- Martens, E. von. 1892-1901. Land and freshwater Mollusca. In F. D. Godman & O. Salvin (Eds.), Biologia Centrali-Americana (pp. 1-706). London: Taylor & Francis.
- Barrientos, Z. (2016). Reproductive system, mating behavior and basic ecology of an extremely rare tropical snail: Drymaeus tripictus (Stylommatophora: Bulimulidae). Revista de Biología Tropical, 64(1), 55-68.
- Breure, A. S. H., & Eskens, A. (1981). Notes on and descriptions of Bulimulidae (Mollusca, Gastropoda), II. Zoologische Verhandelingen, 186, 1-111.
- Pilsbry, H. A. (1899). American Bulimulidae: North Ame- rican and Antillean Drymaeus, Leiostracus, Orthali- cinae and Amphibuliminae. Manual of Conchology, (2)12, 1-258.
- Thompson, F. G. (2011). An annotated checklist and bibliography of the land and freshwater snails of México and central America. Florida Museum of Natural History Bulletin. 50(1): 1-299