Cyclotus amethystinus var. α Guppy, 1868 (in part)
Cyclotus amethystinus var. β Guppy, 1868
Cyclophorus schrammi (Shuttleworth)
Amphicyclotulus mineri Bartsch, 1942
Amphicyclotulus (Amphicyclotulus) mineri Bartsch in Torre, Bartsch & Morrison, 1942
Cyclophorus amethystinus
Amphicyclotulus (Cycloblandia) amethystinus
Shell descriptionedit
The shell is smooth, shining, not striate spirally, generally somewhat more depressed, deep chestnut or reddish brown. Whorls are a little flattened near the suture.[1] The species may have subtle spiral striation, although there exists considerable variation; axial growth lines are clearly visible.[2]
The operculum is horny, diaphanous, concave externally, cartilaginous within, the nucleus projecting internally; with from ten to fourteen very narrow whorls, their rather lamellar outer edges slightly free.[1]
Amphicyclotulus amethystinus has spiral threads absent or only weakly present.[2] There are found only two species in the genus Amphicyclotulus in Dominica. The other species is Amphicyclotulus dominicensis and it has spiral cords clearly present and raised.[2]
Apical view of the shell. Width of the shell is 14.1 mm.
Apical view of the shell. Width of the shell is 18.4 mm.
Robert John Lechmere Guppy (1868)[1] noted that this species is not found above 1000 m. Although he recognized two "forms", he did not recognize two separate species. George French Angas (1884)[3] subsequently recorded "Cyclophorus amethystinus" from altitudes above 1200 m. Paul Bartsch (1942)[4] restricted the name amesthystinus to Guppy’s var. β, the "smooth, shining, not striate spirally" form.[2]
Distributionedit
Distribution of Amphicyclotulus amethystinus (green dots) and Amphicyclotulus dominicensis (one blue dot) in Dominica.
^ abcdefghijRobinson D. G., Hovestadt A., Fields A. & Breure A. S. H. (July 2009). "The land Mollusca of Dominica (Lesser Antilles), with notes on some enigmatic or rare species". Zoologische Mededelingen83http://www.zoologischemededelingen.nl/83/nr03/a13
^Angas G. F. (1884). "On the terrestrial Mollusca of Dominica, collected during a recent visit to that island". Proceedings of the Zoological Society of London1883: 594-597, figs 1-3.
^Bartsch P. (1942). "The cyclophorid mollusks of the West Indies, exclusive of Cuba": 43-141. In: Torre C. de la, Bartsch P. & Morrison J. P. E. (1942). The cyclophorid operculate land mollusks of America. Bulletin United States National Museum181: 1-306, pls 1-42.
February 29, 2024
amphicyclotulus, amethystinus, species, tropical, land, snail, with, gill, operculum, terrestrial, gastropod, mollusk, family, neocyclotidae, scientific, classificationkingdom, animaliaphylum, molluscaclass, gastropoda, unranked, clade, caenogastropodainformal. Amphicyclotulus amethystinus is a species of tropical land snail with a gill and an operculum a terrestrial gastropod mollusk in the family Neocyclotidae Amphicyclotulus amethystinusAmphicyclotulus amethystinus Scientific classificationKingdom AnimaliaPhylum MolluscaClass Gastropoda unranked clade Caenogastropodainformal group ArchitaenioglossaSuperfamily CyclophoroideaFamily NeocyclotidaeGenus AmphicyclotulusSpecies A amethystinusBinomial nameAmphicyclotulus amethystinus Guppy 1868 1 Synonyms 2 Cyclotus amethystinus var a Guppy 1868 in part Cyclotus amethystinus var b Guppy 1868 Cyclophorus schrammi Shuttleworth Amphicyclotulus mineri Bartsch 1942 Amphicyclotulus Amphicyclotulus mineri Bartsch in Torre Bartsch amp Morrison 1942 Cyclophorus amethystinus Amphicyclotulus Cycloblandia amethystinusShell description editThe shell is smooth shining not striate spirally generally somewhat more depressed deep chestnut or reddish brown Whorls are a little flattened near the suture 1 The species may have subtle spiral striation although there exists considerable variation axial growth lines are clearly visible 2 The operculum is horny diaphanous concave externally cartilaginous within the nucleus projecting internally with from ten to fourteen very narrow whorls their rather lamellar outer edges slightly free 1 Amphicyclotulus amethystinus has spiral threads absent or only weakly present 2 There are found only two species in the genus Amphicyclotulus in Dominica The other species is Amphicyclotulus dominicensis and it has spiral cords clearly present and raised 2 nbsp Apical view of the shell Width of the shell is 14 1 mm nbsp Apical view of the shell Width of the shell is 18 4 mm Robert John Lechmere Guppy 1868 1 noted that this species is not found above 1000 m Although he recognized two forms he did not recognize two separate species George French Angas 1884 3 subsequently recorded Cyclophorus amethystinus from altitudes above 1200 m Paul Bartsch 1942 4 restricted the name amesthystinus to Guppy s var b the smooth shining not striate spirally form 2 Distribution edit nbsp Distribution of Amphicyclotulus amethystinus green dots and Amphicyclotulus dominicensis one blue dot in Dominica This species is endemic to in Dominica 2 The type locality is Laudat Dominica 2 The holotype is in National Museum of Natural History under number 535856 2 All known localities of Amphicyclotulus amethystinus include 2 Saint Andrew Parish Dominica west of Calibishie Hampstead Estate Saint Andrew Parish Dominica Carib Territory Saint Andrew Parish Dominica Marigot Captain Bruce Saint Andrew Parish Dominica 1 km northwest of Thibaud Saint David Parish Dominica Emerald Pool Saint David Parish Dominica 1 5 km north of Petit Savane 0 5 km south of Rosalie River bridge Saint George Parish Dominica Bellevue Chopin Saint George Parish Dominica Freshwater Lake area Saint George Parish Dominica trail to Lake Boeri Saint Joseph Parish Dominica d Leau Grommier Saint Joseph Parish Dominica road to Fond Casse Mary Martin Farm Saint Joseph Parish Dominica path Mero Salisbury Saint Luke Parish Dominica Pointe Michel Saint Paul Parish Dominica Sylvania Saint Peter Parish Dominica Syndicate References edit nbsp Wikimedia Commons has media related to Amphicyclotulus amethystinus This article incorporates CC BY 3 0 text from the reference 2 and public domain text from the reference 1 a b c d e Guppy R J L 1868 On the terrestrial mollusks of Dominica and Grenada with an account of some new species from Trinidad Annals and Magazine of Natural History 4 1 429 442 a b c d e f g h i j Robinson D G Hovestadt A Fields A amp Breure A S H July 2009 The land Mollusca of Dominica Lesser Antilles with notes on some enigmatic or rare species Zoologische Mededelingen 83 http www zoologischemededelingen nl 83 nr03 a13 Angas G F 1884 On the terrestrial Mollusca of Dominica collected during a recent visit to that island Proceedings of the Zoological Society of London 1883 594 597 figs 1 3 Bartsch P 1942 The cyclophorid mollusks of the West Indies exclusive of Cuba 43 141 In Torre C de la Bartsch P amp Morrison J P E 1942 The cyclophorid operculate land mollusks of America Bulletin United States National Museum 181 1 306 pls 1 42 Retrieved from https en wikipedia org w index php title Amphicyclotulus amethystinus amp oldid 1192688217, wikipedia, wiki, book, books, library,
