Iwasaki's snail-eater
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Iwasaki's snail-eater (Pareas iwasakii) is a species of snake in the family Pareidae. The species is endemic to the Yaeyama Islands in the southern Ryukyu Islands, Japan.[1]
Etymology
The specific name, iwasakii, is in honor of Japanese meteorologist Takuji Iwasaki.[2]
Habitat
The preferred natural habitats of P. iwasakii are forest, shrubland, and grassland.[3]
Ecology
P. iwasakii is a snail-eating specialist;[4] even newly hatched individuals feed on snails.[5] It has asymmetric dentition on its jaws, with more teeth on the right mandible (about 25 teeth compared to 15 teeth on the left mandible) which facilitates feeding on snails with dextral (clockwise coiled) shells.[6] A consequence of this asymmetry is that P. iwasakii is much less adept at preying on sinistral (counterclockwise coiled) snails.[7] It systematically directs its attack on snails from the right in order to insert its lower jaw into the shell opening.
The selection pressure of this predator on snails of the genus Satsuma has led to a significant increase in the proportion of snails with left-facing shells, known as levogyres, compared to snails with right-facing shells, known as dextrogyres, because the two forms have difficulty mating with each other. This proportion is a local originality, the levorotatory form being very rare on a worldwide scale.[7]
Reproduction
Taxonomy
Originally described as the subspecies Amblycephalus formosensis iwasakii by Moichirō Maki,[8] it was placed in the genus Pareas and elevated to the species P. iwasakii by Tetsuo Takara in 1962.[9]
References
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- ↑ a b Pareas iwasakii at the Reptarium.cz Reptile Database
- ↑ Beolens B, Watkins M, Grayson M (2011). The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp. Template:ISBN. (Pareas iwasakii, p. 131).
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Further reading
- Goris, Richard C.; Maeda, Norio (2004). Guide to the Amphibians and Reptiles of Japan. Malabar, Florida: Krieger Publishing Company. 285 pp. Template:ISBN.
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- Ota, Hidetoshi (2000). "Current status of threatened amphibians and reptiles of Japan". Population Ecology 42: 5–9.
- Takara, Tetsuo (1962). "[Studies on the terrestrial snakes in the Ryukyu Archipelago]". [Science Bulletin of the Division of Agriculture, Home Economics and Engineering, University of the Ryukyus ] 9: 1–202. (in Japanese, with an abstract in English). (Pareas iwasakii, new combination).