''Isanda'' is a
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
of
sea snail
Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the ...
s,
marine
Marine is an adjective meaning of or pertaining to the sea or ocean.
Marine or marines may refer to:
Ocean
* Maritime (disambiguation)
* Marine art
* Marine biology
* Marine debris
* Marine habitats
* Marine life
* Marine pollution
Military
* ...
gastropod
The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda ().
This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...
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 e ...
s in the
family
Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...
Trochidae
The Trochidae, common name top-snails or top-shells, are a family of various sized sea snails, marine gastropod molluscs in the subclass Vetigastropoda. This family is commonly known as the top-snails because in many species the shell resembles ...
, the top snails.
Description
The compact shell of species in this genus has an orbicular-conoidal shape and is porcellanous and polished. The subquadrate
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 opt ...
is longer than wide, The inner lip is straight, forming an angle with the outer lip. The
umbilicus is open (not covered by a callous deposit) and perspective. The margin is crenulated. The multispiral
operculum is corneous. The interior has a very thin nacreous layer.
Species
Species within the genus ''Isanda'' include:
* ''
Isanda coronata''
A. Adams, 1854
* ''
Isanda holdsworthana''
H. Nevill & G. Nevill, 1871
* ''
Isanda murrea''
(Reeve, 1848)
;Species brought into synonymy:
* ''Isanda crenellifera''
A. Adams, 1862: synonym of ''
Microthyca crenellifera''
(A. Adams, 1862)
* ''Isanda lepida''
A. Adams, 1853: synonym of ''
Isanda coronata''
A. Adams, 1854
* ''Isanda pulchella''
A. Adams, 1855: synonym of ''
Ethaliella pulchella
''Ethaliella pulchella'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.Bouchet, P. (2012). ''Ethaliella pulchella'' (A. Adams, 1855). Accessed through: World Register of Marine Species at http://ww ...
''
(A. Adams, 1855)
References
Arthur Adams, ''A monograph on Isanda, a new genus of Trochidae allied to Umbonium''; Proceedings of the Zoological Society of London pt. 21-23 (1853-1855)* Williams S.T., Karube S. & Ozawa T. (2008) ''Molecular systematics of Vetigastropoda: Trochidae, Turbinidae and Trochoidea redefined''. Zoologica Scripta 37: 483–506.
{{Taxonbar, from=Q6078815
Trochidae
Gastropod genera