''Agatha'' 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 minute

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 or 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 within the subfamily Syrnolinae, which is a part of the family

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 ...

.Rosenberg, G. (2012). Agatha A. Adams, 1860. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=599126 on 2012-08-27 They have

bilateral symmetry Symmetry in biology refers to the symmetry observed in organisms, including plants, animals, fungi, and bacteria. External symmetry can be easily seen by just looking at an organism. For example, the face of a human being has a plane of symme ...

and only have

endoderm Endoderm is the innermost of the three primary germ layers in the very early embryo. The other two layers are the ectoderm (outside layer) and mesoderm (middle layer). Cells migrating inward along the archenteron form the inner layer of the gastr ...

and

ectoderm The ectoderm is one of the three primary germ layers formed in early embryonic development. It is the outermost layer, and is superficial to the mesoderm (the middle layer) and endoderm (the innermost layer). It emerges and originates from the o ...

tissues. The species of this genus are

ectoparasites Parasitism is a close relationship between species, where one organism, the parasite, lives (at least some of the time) on or inside another organism, the host, causing it some harm, and is adapted structurally to this way of life. The en ...

on other

invertebrates Invertebrates are animals that neither develop nor retain a vertebral column (commonly known as a ''spine'' or ''backbone''), which evolved from the notochord. It is a paraphyletic grouping including all animals excluding the chordate subphylum ...

Distribution

* Marine

Species

* † '' Agatha alexanderi'' (Marwick, 1929) * '' Agatha amabilis'' Nomura, 1936 * '' Agatha australis'' (Angas, 1871) * ''

Agatha brevis Agatha may refer to: *Agatha (given name), a feminine given name *Agatha, Alberta, a locality in Canada *List of storms named Agatha, tropical storms and hurricanes *Operation Agatha, a 1946 British police and military operation in Mandatory Palest ...

'' Yokoyama, 1922 * '' Agatha filia'' (Melvill, 1893) * '' Agatha georgiana'' (Hutton, 1885) * '' Agatha laevis'' (Angas, 1867) * ''

Agatha obesa Agatha may refer to: *Agatha (given name), a feminine given name *Agatha, Alberta, a locality in Canada *List of storms named Agatha, tropical storms and hurricanes *Operation Agatha, a 1946 British police and military operation in Mandatory Palest ...

'' Peñas & Rolán, 2016 * † ''

Agatha otaioensis Agatha may refer to: *Agatha (given name), a feminine given name *Agatha, Alberta, a locality in Canada *List of storms named Agatha, tropical storms and hurricanes *Operation Agatha, a 1946 British police and military operation in Mandatory Palest ...

'' Laws, 1940 * ''

Agatha pacei Agatha may refer to: *Agatha (given name), a feminine given name *Agatha, Alberta, a locality in Canada *List of storms named Agatha, tropical storms and hurricanes *Operation Agatha, a 1946 British police and military operation in Mandatory Palest ...

'' (Dautzenberg & Fischer, 1906) * † ''

Agatha pittensis Agatha may refer to: *Agatha (given name), a feminine given name *Agatha, Alberta, a locality in Canada *List of storms named Agatha, tropical storms and hurricanes *Operation Agatha, a 1946 British police and military operation in Mandatory Palest ...

'' (Marwick, 1928) * ''

Agatha placida Agatha may refer to: *Agatha (given name), a feminine given name *Agatha, Alberta, a locality in Canada *List of storms named Agatha, tropical storms and hurricanes *Operation Agatha, a 1946 British police and military operation in Mandatory Palest ...

'' Nomura, 1936 * ''

Agatha vestalis Agatha may refer to: *Agatha (given name), a feminine given name *Agatha, Alberta, a locality in Canada *List of storms named Agatha, tropical storms and hurricanes *Operation Agatha, a 1946 British police and military operation in Mandatory Palest ...

'' Melvill, 1910 * ''

Agatha virgo ''Agatha virgo'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies. The species is one of the two species within the Agatha genus, with the exception of the other related species bei ...

'' Weisbord, 1962 ;Species brought into synonymy: * ''Agatha angasi'' (Tryon, 1886): synonym of ''

Syrnola angasi ''Syrnola angasi'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.Rosenberg, G. (2011). ''Syrnola angasi'' (Tryon, 1886). Accessed through: World Register of Marine Species The ...

'' (Tryon, 1886) * ''Agatha infrequens'' Nomura, 1937: synonym of ''

Odostomia infrequens ''Odostomia'' is the most speciose genus of minute sea snails, pyramidellid gastropod mollusks. This genus is placed in the family Pyramidellidae in the subfamily Odostomiinae. There are several hundred species in this diverse genus (Schander et ...

'' (Nomura, 1937) * ''Agatha lepidula'' Habe, 1961: synonym of ''

Tibersyrnola lepidula ''Tibersyrnola'' is a genus of sea snails, marine gastropod mollusks in the family Pyramidellidae, the pyrams and their allies.WoRMS (2010). ''Tibersyrnola'' Laws, 1937. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca data ...

'' (Habe, 1961) * ''Agatha simplex'' (Angas, 1871): synonym of '' Megastomia simplex'' (Angas, 1871)

References

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''
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