Julia is a minute sea snails genus, marine

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 or

micromollusk A micromollusk is a shelled mollusk which is extremely small, even at full adult size. The word is usually, but not exclusively, applied to marine mollusks, although in addition, numerous species of land snails and freshwater mollusks also ...

s in the superfamily

Oxynooidea Oxynooidea is a superfamily of small sea snails, bubble snails and bivalved gastropods, marine gastropod mollusks within the superorder Sacoglossa. MolluscaBase eds. (2021). MolluscaBase. Oxynooidea Stoliczka, 1868 (1847). Accessed through: Wor ...

. ''Julia'' is the

type genus In biological taxonomy, the type genus is the genus which defines a biological family and the root of the family name. Zoological nomenclature According to the International Code of Zoological Nomenclature, "The name-bearing type of a nominal f ...

of the family

Juliidae Juliidae, common name the bivalved gastropods, is a family of minute sea snails, marine gastropod mollusks or micromollusks in the superfamily Oxynooidea, an opisthobranch group. MolluscaBase eds. (2021). MolluscaBase. Juliidae E. A. Smith, 188 ...

Description

As Tryon (1884) Tryon G. W. Jr. (1884)
''Structural and systematic conchology: an introduction to the study of the Mollusca. Volume III''
Philadelphia, published by the author
p. 267
wrote in his description of the genus ''Julia'': the shell is oblong, thick, and cordiform. The valves are closed, the margins entire and the valves are inequilateral. The lunule is deep circular, projecting into the interior of the right

valve A valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fittings ...

, the left valve is in the same place furnished with dentiform tubercles. The hinge line is simple and arched. The

ligament A ligament is the fibrous connective tissue that connects bones to other bones. It is also known as ''articular ligament'', ''articular larua'', ''fibrous ligament'', or ''true ligament''. Other ligaments in the body include the: * Peritoneal li ...

is external and narrow. There are two muscle scars which are unequal and subcentral. These animals have two

valves A valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fitting ...

, and the soft parts can be completely withdrawn inside the shell. de Bruyne R. H. (2004). ''Encyklopedie ulit a lastur''. Rebo Productions, 336 pp., , p. 223. The two valves are usually thin and translucent. The empty valves of the shells of these animals are in some cases green, in other cases brownish-green or yellow, and in yet others, colorless. The species '' Julia zebra'' has shells that are finely striped with brown and blotched with white.

Species

* (recent) '' Julia burni'' Sarma, 1975 * (invalidJensen K. R. (1996). "Phylogenetic systematics and classification of the Sacoglossa (Mollusca, Gastropoda, Opisthobranchia)". ''Philosophical Transactions of the Royal Society London B Biological Sciences'' 351(1335): 91-122. . recent species) '' Julia cornuta'' (De Folin, 1867) * (invalid recent species) '' Julia equatorialis'' Pilsbry & Olsson, 1944 * (recent) ''

Julia exquisita ''Julia exquisita'' is a small species of sea snail with a green bivalve shell. It is a marine gastropod mollusk in the family Juliidae. This species can be found in shallow tropical habitats throughout the Pacific, and are known for their f ...

'' Gould, 1862 - this species was mentioned in report by the

Challenger expedition The ''Challenger'' expedition of 1872–1876 was a scientific program that made many discoveries to lay the foundation of oceanography. The expedition was named after the naval vessel that undertook the trip, . The expedition, initiated by Wi ...

* (recent) '' Julia japonica'' Kuroda & Habe, 1951 * (recent) '' Julia mishimaensis'' Kawaguti & Yamasu, 1982Bolland R. F. (2001)
"Okinawan Opisthobranch of the Week ''Julia exquisita''"
Last change of the page 12 March 2001. * (recent) '' Julia thecaphora'' (Carpenter, 1857) - a probable synonym is '' Julia zebra'' Kawaguti, 1981Kawaguti S. (1981). "A new bivalved gastropod ''Julia zebra''". ''Bulletin of the Kawasaki Paramedical College'' 1: 9-13. * (recent) '' Julia zebra'' Kawaguti 1981

References

External links

{{DEFAULTSORT:Julia (Gastropod) Juliidae