Julia (gastropod)

Julia is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the superfamily Oxynooidea.

Julia
Julia exquisita
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia

clade Euthyneura
clade Panpulmonata
clade Sacoglossa

clade Oxynoacea
Superfamily:
Oxynooidea
Family:
Juliidae
Subfamily:
Juliinae
Genus:
Julia

Species

See text.

Synonyms

Prasina Deshayes, 1863

Julia is the type genus of the family Juliidae.

Description
Drawing of the shell (the exterior of the right valve) of taxon named Julia borbonica
Drawing of the interior of the left valve of the shell of "Julia borbonica".
Drawing of the interior of the right valve of the shell of "Julia borbonica".

As Tryon (1884)[2] 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, the left valve is in the same place furnished with dentiform tubercles. The hinge line is simple and arched. The ligament is external and narrow. There are two muscle scars which are unequal and subcentral.

These animals have two valves, and the soft parts can be completely withdrawn inside the shell.[3] The two valves are usually thin and translucent.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.[4]

Species

References
  1. Gould A. A. (1862). Proc. Boston Soc. nat. Hist. 8: 283.
  2. 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.
  3. (in Czech) de Bruyne R. H. (2004). Encyklopedie ulit a lastur. Rebo Productions, 336 pp., ISBN 80-7234-288-6, p. 223.
  4. "Julia zebra: Shell".
  5. Jensen 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. doi:10.1098/rstb.1996.0006.
  6. Rudman W. B. (4 October 2001). "Julia exquisita (Gould, 1862)" Archived 15 June 2010 at the Wayback Machine. Sea Slug Forum. Australian Museum, Sydney, accessed 10 May 2009.
  7. 19thCenturyScience.org
  8. 19thCenturyScience.org
  9. 19thCenturyScience.org , accessed 7 December 2008
  10. Bolland R. F. (2001). "Okinawan Opisthobranch of the Week Julia exquisita". Last change of the page 12 March 2001.
  11. Poppe-Images.com, accessed 11 May 2009
  12. Pittman C. (10 October 2001). "Julia zebra Kawaguti, 1981" Archived 15 June 2010 at the Wayback Machine. Sea Slug Forum. Australian Museum, Sydney, accessed 10 May 2009.
  13. Kawaguti S. (1981). "A new bivalved gastropod Julia zebra". Bulletin of the Kawasaki Paramedical College 1: 9-13.
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