Tropidoptera Discus
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''Tropidoptera'' is a genus of small, air-breathing
land snail A land snail is any of the numerous species of snail that live on land, as opposed to the sea snails and freshwater snails. ''Land snail'' is the common name for terrestrial molluscs, terrestrial gastropod mollusks that have gastropod shell, shel ...
s,
terrestrial Terrestrial refers to things related to land or the planet Earth, as opposed to extraterrestrial. Terrestrial may also refer to: * Terrestrial animal, an animal that lives on land opposed to living in water, or sometimes an animal that lives on o ...
pulmonate Pulmonata or pulmonates is an informal group (previously an order, and before that, a subclass) of snails and slugs characterized by the ability to breathe air, by virtue of having a pallial lung instead of a gill, or gills. The group inclu ...
gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...
mollusk Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000  extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. The ...
s in the family
Amastridae Amastridae is a Taxonomy (biology), taxonomic family (biology), family of small, air-breathing, land snails, Terrestrial animal, terrestrial pulmonate gastropod mollusks in the superfamily Pupilloidea.MolluscaBase eds. (2021). MolluscaBase. Amast ...
.


Description

(Described as ''Endodonta (Pterodiscus)'') The shell is umbilicated, depressed, thin, or fragile, with a translucent horny-brown coloration. The
whorl A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs). In nature File:Photograph and axial plane floral diagra ...
s are finely and densely striated, with the
body whorl The body whorl is part of the morphology (biology), morphology of the gastropod shell, shell in those gastropod mollusks that possess a coiled shell. The term is also sometimes used in a similar way to describe the shell of a cephalopod mollusk ...
sharply keeled at the periphery and distinctly carinated around the umbilicus. The
aperture In optics, the aperture of an optical system (including a system consisting of a single lens) is the hole or opening that primarily limits light propagated through the system. More specifically, the entrance pupil as the front side image o ...
is oblique and toothless, with a thin, simple
lip The lips are a horizontal pair of soft appendages attached to the jaws and are the most visible part of the mouth of many animals, including humans. Mammal lips are soft, movable and serve to facilitate the ingestion of food (e.g. sucklin ...
.


Distribution

It is endemic to the
Hawaiian Islands The Hawaiian Islands () are an archipelago of eight major volcanic islands, several atolls, and numerous smaller islets in the Pacific Ocean, North Pacific Ocean, extending some from the Hawaii (island), island of Hawaii in the south to nort ...
.


Species

Species within the genus ''Tropidotera'' include: * '' Tropidoptera alata'' (L. Pfeiffer, 1856) * '' Tropidoptera discus'' (Pilsbry & Vanatta, 1905) * ''
Tropidoptera heliciformis ''Tropidoptera heliciformis'' is a species of small, air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Amastridae. Description The length of the shell attains 6 mm, its diameter 10 mm. (Original description in L ...
'' (Ancey, 1890) * ''
Tropidoptera rex ''Tropidoptera'' is a genus of small, air-breathing land snails, Terrestrial animal, terrestrial pulmonate gastropod mollusks in the family Amastridae. Description (Described as ''Endodonta (Pterodiscus)'') The shell is umbilicated, depressed, ...
'' (Sykes, 1904) * '' Tropidoptera wesleyi'' (Sykes, 1896)


References

* *


External links


Nomenclator Zoologicus info
* * {{Taxonbar, from=Q7846228 Amastridae Taxa named by César Marie Félix Ancey Taxonomy articles created by Polbot