Amphidromus inversus
| Amphidromus inversus | |
|---|---|
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| juvenile Amphidromus inversus | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Order: | Stylommatophora |
| Family: | Camaenidae |
| Genus: | Amphidromus |
| Species: | A. inversus
|
| Binomial name | |
| Amphidromus inversus O. F. Müller, 1774
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| Synonyms | |
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Amphidromus inversus is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Camaenidae. [1]
Like most members of the subgenus Amphidromus, it is chirally dimorphic: within the same populations, both dextral (clockwise-coiled) and sinistral (anticlockwise-coiled) individuals co-exist. This is one of the very few cases of genetic antisymmetry known in nature. Among the subgenus Amphidromus, A. inversus stands out because since c. 2004, it has been the focus of studies aimed at understanding the evolution of chiral dimorphism. Most of these studies have taken place on the Malaysian island of Kapas.
Subspecies
[edit]- Amphidromus inversus albulus Sutcharit & Panha, 2006
- Amphidromus inversus andamensis (L. Pfeiffer, 1871)
- Amphidromus inversus annamiticus (Crosse & P. Fischer, 1863)
- Amphidromus inversus fureyi Thach & F. Huber, 2021
- Amphidromus inversus inversus (O. F. Müller, 1774)
- Amphidromus inversus koperbergi Laidlaw & Solem, 1961
Distribution
[edit]Sumatra, Peninsular Malaysia, Thailand
Description
[edit]_(4248353502).jpg)
(Original description of Helix inversa in Latin) This Helix possesses a conico-acuminate shell that is sinistral and whitish, displaying reddish streaks and a band, and features a reflected lip.
This is a somewhat larger Helix (land snail) and it exhibits a dextral coiling, sharing similarities in shape and size with Helix recta, but differing in color and the coiling direction of its whorls. The apex of this shell is acute. Its eight whorls coil sinistrally and are marked with reddish streaks drawn obliquely along their length; a broad pale reddish band encircles the shell near the base. The aperture is ovate and white. The outer lip appears pure white and reflected; the inner lip (labium incumbens) presents the same color, while the whorl penetrating the aperture is brown. [2]
(Description by Reeve) The shell is oblong-ovate and rather thick, most frequently coiling sinistrally. It comprises seven convex, smooth whorls with a reflected lip. Its base color is whitish, overlaid with stains and irregularly longitudinal streaks of burnt brown. The lip appears white, while the columella and outer edge of the lip exhibit a purplish-brown hue. [3]
Ecology
[edit]
Schilthuizen et al. (2005) described spatial structure of population of Amphidromus inversus in Malaysia.[4]
References
[edit]- ^ MolluscaBase eds. (2020). MolluscaBase. Amphidromus inversus (O. F. Müller, 1774). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=1245795 on 2020-05-17
- ^ Müller, O.F. (1774). Vermium terrestrium et fluviatilium, seu animalium infusorium, Helminthicorum, et testaceorum, non marinorum, succincta historia. vol 2. Vol. v.2. Havniae et Lipsiae: Heineck et Faber, ex officina Mölleriana. p. 93. Retrieved 26 April 2025.
This article incorporates text from this source, which is in the public domain.
- ^ Reeve, L.A. (1848–1850). Monograph of the genus Bulimus. In: Conchologia Iconica, or, illustrations of the shells of molluscous animals, 5: Pls 1–89 and unpaginated text. London: Reeeve & co. p. 37. Retrieved 26 April 2025. This article incorporates text from this source, which is in the public domain.
- ^ Schilthuizen, M.; Scott, B. J.; Cabanban, A. S.; Craze, P. G. (2005). "Population structure and coil dimorphism in a tropical land snail". Heredity. 95 (3): 216–220. Bibcode:2005Hered..95..216S. doi:10.1038/sj.hdy.6800715. PMID 16077741.
- Maassen, W. J. M. (2001). A preliminary checklist of the non-marine molluscs of West-Malaysia: "a Hand List". De Kreukel, Extra Editie 2001. 1–155
- Yamane, S. & Tomiyama, K. (1986). A small collection of land snails from the Krakatau Islands, Indonesia. Venus, 45 (1): 61-64. Tokyo.
Further reading
[edit]- Schilthuizen, M.; Craze, P. G.; Cabanban, A. S.; Davison, A.; Stone, J.; Gittenberger, E.; Scott, B. J. (2007). "Sexual selection maintains whole-body chiral dimorphism in snails". Journal of Evolutionary Biology. 20 (5): 1941–1949. doi:10.1111/j.1420-9101.2007.01370.x. PMC 2121153. PMID 17714311.
- Schilthuizen, M.; Looijestijn, S. (2009). "The Sexology of the Chirally Dimorphic Snail SpeciesAmphidromus inversus(Gastropoda: Camaenidae)". Malacologia. 51 (2): 379. doi:10.4002/040.051.0210.
- Sutcharit, C. (2006). "A new subspecies of Amphidromus (A.) inversus (Müller, 1774) from Peninsular Malaysia". Journal of Conchology. 39 (1): 79–83.
- (in Dutch) "Kurkentrekkers leiden tot slakken-seksschandaal". Naturalis (in Dutch). 19 June 2007. Archived from the original on 23 February 2013.
External links
[edit]- Müller, O. F. (1774). Vermium terrestrium et fluviatilium, seu animalium infusorium, Helminthicorum, et testaceorum, non marinorum, succincta historia. vol 2: I-XXXVI, 1-214, 10 unnumbered pages. Havniae et Lipsiae, apud Heineck et Faber, ex officina Molleriana
- C.; Panha, S. (2006). Taxonomic review of the tree snail Amphidromus Albers, 1850 (Pulmonata: Camaenidae) in Thailand and adjacent areas: Subgenus Amphidromus. Journal of Molluscan Studies. 72(1): 1-30
- Sutcharit C, Tongkerd P, Panha S (2013). "First record on chiral dimorphic population of Amphidromus inversus annamiticus (Crosse and Fischer, 1863) from Thailand". Tropical Natural History. 13: 53–57. doi:10.58837/tnh.13.1.103040.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - photo of sinistral shell
