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Glass Squid (Family: Cranchiidae) - Wiki latin dict size=24   common dict size=1409
Image Info Original File Name: Squidu-Cranchiid squid or glass squid.jpg Resolution: 309x326 File Size: 7971 Bytes Upload Time: 2007:10:21 21:01:35
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Subject Glass Squid (Family: Cranchiidae) - Wiki
Glass Squid (Family: Cranchiidae) - Wiki; Image ONLY
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Glass Squid (Family: Cranchiidae) - Wiki

Glass squid
From Wikipedia, the free encyclopedia

[Photo] Cranchiid squid juvenile found in plankton, Antarctica. Photo by Uwe Kils (http://en.wikipedia.org/wiki/User:Kils). Larger images via http://www.ecoscope.com/squid/index5.htm
Copyright (C) 2004 Uwe Kils
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".


The family Cranchiidae comprises the approximately 60 species of glass squid, also known as cranchiid or cranch squid. Cranchiid squid occur in surface and midwater depths of open oceans around the world. They range in mantle length from 10 cm to over 3 m, in the case of the Colossal Squid. The common name, glass squid, derives from the transparent nature of most species. Cranchiid squid spend much of their lives in partially sunlit shallow waters where their transparency provides camouflage. They are characterised by a swollen body and short arms, which bear two rows of suckers or hooks. The third arm pair is often enlarged. Many species are bioluminescent organisms and possess light organs on the undersides of their eyes, used to cancel their shadow. Eye morphology varies widely, ranging from large and circular to telescopic and stalked. A large fluid-filled chamber containing ammonia solution is used to aid buoyancy. Often the only organ that is visible through the transparent tissues is a cigar-shaped digestive gland, which is the cephalopod equivalent of a mammalian liver. This is usually held in a vertical position to reduce its silhouette and a light organ is sometimes present on the lower tip to further minimise its appearance in the water.

Like most squid, the juveniles of cranchiid squid live in surface waters, descending to deeper waters as they mature. Some species live over two kilometres below sea level. The body shape of many species changes drastically between growth stages and many young examples could be confused for different species altogether.

Cranchiid squid represent no interest to commercial fisheries.

Genera
Subfamily Cranchiinae
Genus Cranchia
Genus Drechselia *
Genus Leachia
Genus Liocranchia
Subfamily Taoniinae
Genus Bathothauma
Genus Belonella
Genus Egea
Genus Galiteuthis
Genus Helicocranchia
Genus Liguriella
Genus Megalocranchia
Genus Mesonychoteuthis
Genus Sandalops
Genus Taonius
Genus Teuthowenia

The genus listed above with an asterisk (*) is questionable and needs further study to determine if it is a valid genus or a synonym.

http://en.wikipedia.org/wiki/Glass_squid
The text in this page is based on the copyrighted Wikipedia article shown in above URL. It is used under the GNU Free Documentation License. You may redistribute it, verbatim or modified, providing that you comply with the terms of the GFDL.

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