''Demoulia'' is a
genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
of
sea snail
Sea snails are slow-moving marine (ocean), marine gastropod Mollusca, molluscs, usually with visible external shells, such as whelk or abalone. They share the Taxonomic classification, taxonomic class Gastropoda with slugs, which are distinguishe ...
s,
marine 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
Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...
Nassariidae
The Nassariidae, Nassa mud snails (US), or dog whelks (UK) are a taxonomic family of small to medium-sized snails, mostly marine gastropod mollusks in the clade Neogastropoda. These snails have rounded shells with a high spire, an oval ap ...
, the Nassa mud snails or dog whelks.
Description
The ovate-globose shell is covered with a downy epidermis. The
spire
A spire is a tall, slender, pointed structure on top of a roof of a building or tower, especially at the summit of church steeples. A spire may have a square, circular, or polygonal plan, with a roughly conical or pyramidal shape. Spire ...
is short, conical with a papillary
apex
The apex is the highest point of something. The word may also refer to:
Arts and media Fictional entities
* Apex (comics)
A-Bomb
Abomination
Absorbing Man
Abraxas
Abyss
Abyss is the name of two characters appearing in Ameri ...
. 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 depressed. 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 ovate. The inner
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 ...
is thickened, with a ridge posteriorly. The outer lip is contracted, thickened externally and plicated internally.
Species
Species within the genus ''Demoulia'' include:
* ''
Demoulia abbreviata''
(Gmelin, 1791)
* † ''
Demoulia conglobata''
(Brocchi, 1814)
* ''
Demoulia nataliae''
Kilburn, 1972
* ''
Demoulia obtusata''
(Link, 1807)
* † ''
Demoulia pupa''
(Brocchi, 1814)
* ''
Demoulia tryoni''
(Crosse, 1869)
* ''
Demoulia ventricosa''
(Lamarck, 1816)
* † ''
Demoulia zbyszewskii
''Demoulia'' is a genus of sea snails, marine (ocean), marine gastropod mollusks in the family (biology), family Nassariidae, the Nassa mud snails or dog whelks.
Description
The ovate-globose shell is covered with a downy epidermis. The Spire (m ...
''
Landau, Marques da Silva & Gili, 2009
; Species brought into synonymy :
* ''Demoulia kurodai''
Tomlin, 1932 : synonym of ''
Nassarius sufflatus''
(Gould, 1860)
* ''Demoulia pulchra''
Gray, 1838 : synonym of ''Demoulia obtusata''
(Link, 1807)
* ''Demoulia retusa''
(Lamarck, 1822): synonym of ''Demoulia ventricosa''
(Lamarck, 1816)
References
* Vaught, K.C. (1989). ''A classification of the living Mollusca''. American Malacologists: Melbourne, FL (USA). . XII, 195 pp
* Gofas, S.; Le Renard, J.; Bouchet, P. (2001). ''Mollusca, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification''. Collection Patrimoines Naturels, 50: pp. 180–213
External links
Gray, J.E. (1838). On some new species of quadrupeds and shells. Annals of Natural History. ser. 1, 1: 27-30Galindo, L. A.; Puillandre, N.; Utge, J.; Lozouet, P.; Bouchet, P. (2016). The phylogeny and systematics of the Nassariidae revisited (Gastropoda, Buccinoidea). Molecular Phylogenetics and Evolution. 99: 337-353
Nassariidae
{{Nassariidae-stub