''Sagda alligans'' is a
species
In biology, a species is the basic unit of Taxonomy (biology), classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of ...
of air-breathing
land snail, a
terrestrial
Terrestrial refers to things related to land or the planet Earth.
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 or near the ground, as opposed to ...
pulmonate gastropod mollusk
Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is es ...
in the
family
Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...
Sagdidae
Sagdidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks with highest diversity in the Greater Antilles. It has been classified in its own superfamily Sagdoidea and as a member of the superfamily Helicoide ...
.
Shell description
The
shell
Shell may refer to:
Architecture and design
* Shell (structure), a thin structure
** Concrete shell, a thin shell of concrete, usually with no interior columns or exterior buttresses
** Thin-shell structure
Science Biology
* Seashell, a hard o ...
is imperforate, globosely conoidal, white, under a brownish-yellow epidermis. The incremental striae are regular, stronger on the spire than on the
body whorl. The number of whorls is 8. The shell has a narrow,
aperture
In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane.
An ...
with a deep-seated strong basal lamella.
The adult shell diameter is 15–20 mm.
Distribution
This species occurs in
Jamaica
Jamaica (; ) is an island country situated in the Caribbean Sea. Spanning in area, it is the third-largest island of the Greater Antilles and the Caribbean (after Cuba and Hispaniola). Jamaica lies about south of Cuba, and west of Hispan ...
.
[ Tryon G. W. 1887 ''Manual of conchology; structural and systematic. With illustrations of the species''. Second series: Pulmonata]
Volume 3
Helicidae - Volume I. pag
6
References
External links
* http://www.discoverlife.org/mp/20q?search=Sagda+alligans&guide=Molluscs
* https://web.archive.org/web/20081020150243/http://shell.kwansei.ac.jp/~shell/pic_book/data43/r004262.html
{{Taxonbar, from=Q7399090
Sagdidae
Gastropods described in 1851