''Siogamaia'' is a small
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 very small
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,
pyramidellid 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 or
micromollusk
A micromollusc is a shelled mollusc which is extremely small, even at full adult size. The word is usually, but not exclusively, applied to marine molluscs, although in addition, numerous species of land snails and freshwater molluscs also ...
s. This genus is currently placed in the subfamily
Chrysallidinae
Chrysallidinae is a taxonomic group of very small sea snails, marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.
Taxonomy
Chrysallidinae has been one of eleven recognized subfamilies of the gastropod family Py ...
of 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 ...
Odostomiidae
Odostomiinae, ''Odostomia'' snails and their allies, is a taxonomic subfamily of minute parasitic sea snails. These are marine heterobranch gastropod mollusks, or micromollusks, in the family Pyramidellidae.
Taxonomy
The subfamily Odostomiinae ...
. The genus was originally described as a subgenus of ''Tropaeas'' Dall & Bartsch, 1904, but was later erected to a full genus and placed within Chysallidinae by Schander et al. (1999).
Shell description
The original genus description (Nomusa 1936), states that ''Siogamaia'' is a shell of moderate size with many whorls. The outline is elongate-conical in outline. The surface is marked by weak axial ribs that are mostly shown in the earlier whorls. The interspaces between the ribs are smooth. The Aperture is obliquely ovate with a single distinct columellar fold. The outer lip is smooth within,
Life history
Nothing is known about the biology of the members of this genus. As is true of most members of the
Pyramidellidae
Pyramidellidae, common name the pyram family, or pyramid shells, is a voluminous taxonomic family of mostly small and minute ectoparasitic sea snails, marine heterobranch gastropod molluscs. The great majority of species of pyrams are micromol ...
''
sensu lato
''Sensu'' is a Latin word meaning "in the sense of". It is used in a number of fields including biology, geology, linguistics, semiotics, and law. Commonly it refers to how strictly or loosely an expression is used in describing any particular co ...
'', they are most likely to be
ectoparasite
Parasitism is a Symbiosis, close relationship between species, where one organism, the parasite, lives (at least some of the time) on or inside another organism, the Host (biology), host, causing it some harm, and is Adaptation, adapted str ...
s.
Species
Species within the genus ''Siogamaia'' include:
* ''
Siogamaia fortiplicata''
(Nomura, 1936) (Type species) (As''Tropaeas (Siogamaia) fortiplicata'')
* ''
Siogamaia akasakiensis'' Nomura, 1936
* ''
Siogamaia akatiperipherata''
Nomura, 1936
* ''
Siogamaia asamusi
''Siogamaia'' is a small genus of very small sea snails, Pyramidellidae, pyramidellid gastropod mollusks or micromollusks. This genus is currently placed in the subfamily Chrysallidinae of the Family (biology), family Odostomiidae. The genus was ...
''
Nomura, 1936
* ''
Siogamaia desiderabilis''
Nomura, 1936
* ''
Siogamaia kinkwazan''
Nomura, 1937
* ''
Siogamaia morioria
''Siogamaia morioria'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.Rosenberg, G. (2012). ''Siogamaia morioria'' Laws, 1941. Accessed through: World Register of Marine Species
...
''
(Laws, 1941)
* ''
Siogamaia minamotoi
''Siogamaia'' is a small genus of very small sea snails, pyramidellid gastropod mollusks or micromollusks. This genus is currently placed in the subfamily Chrysallidinae of the family Odostomiidae. The genus was originally described as a subgen ...
''
(Nomura, 1936)
* ''
Siogamaia namensis
''Siogamaia'' is a small genus of very small sea snails, pyramidellid gastropod mollusks or micromollusks. This genus is currently placed in the subfamily Chrysallidinae of the family Odostomiidae. The genus was originally described as a subgen ...
''
(Corgan & Van Aartsen, 1998)
* ''
Siogamaia odostomoides
''Siogamaia'' is a small genus of very small sea snails, pyramidellid gastropod mollusks or micromollusks. This genus is currently placed in the subfamily Chrysallidinae of the family Odostomiidae. The genus was originally described as a subgen ...
''
Nomura, 1937
* ''
Siogamaia problematica
''Siogamaia'' is a small genus of very small sea snails, pyramidellid gastropod mollusks or micromollusks. This genus is currently placed in the subfamily Chrysallidinae of the family Odostomiidae. The genus was originally described as a subgen ...
''
(Nomura, 1936)
* ''
Siogamaia quantoensis
''Siogamaia'' is a small genus of very small sea snails, pyramidellid gastropod mollusks or micromollusks. This genus is currently placed in the subfamily Chrysallidinae of the family Odostomiidae. The genus was originally described as a subgen ...
''
Nomura, 1937
* ''
Siogamaia semiplicata
''Siogamaia'' is a small genus of very small sea snails, pyramidellid gastropod mollusks or micromollusks. This genus is currently placed in the subfamily Chrysallidinae of the family Odostomiidae. The genus was originally described as a subgen ...
''
(Turton, 1932)
* ''
Siogamaia takonourana
''Siogamaia'' is a small genus of very small sea snails, pyramidellid gastropod mollusks or micromollusks. This genus is currently placed in the subfamily Chrysallidinae of the family Odostomiidae. The genus was originally described as a subgen ...
''
(Nomura, 1936)
* ''
Siogamaia venus''
(Nomura, 1936)
References
Ronald G. Noseworthy, Na-Rae Lim, and Kwang-Sik Choi, A Catalogue of the Mollusks of Jeju Island, South Korea; Korean Journal of Malacology, Vol. 23(1): 65-104, June 30, 2007*
*
External links
Spencer H.G., Willan R.C., Marshall B.A. & Murray T.J. (2011) ''Checklist of the Recent Mollusca Recorded from the New Zealand Exclusive Economic Zone''
Pyramidellidae
{{Pyramidellidae-stub
de:Pyramidelloidea