翻訳と辞書
Words near each other
・ Echinosphaeria
・ Echinosphaeridium
・ Echinosphaerites
・ Echinosteliales
・ Echinostelium
・ Echinostoma
・ Echinostoma cinetorchis
・ Echinostoma hortense
・ Echinostoma liei
・ Echinostoma revolutum
・ Echinostomata
・ Echinostomida
・ Echinoteuthis
・ Echinothecium
・ Echinothrix
Echinothrix calamaris
・ Echinothrix diadema
・ Echinothuriidae
・ Echinothurioida
・ Echinotriton
・ Echinovelleda
・ Echinozoa
・ Echinozoon
・ Echinula
・ Echinulate
・ Echinus
・ Echinus (sea urchin)
・ Echinus esculentus
・ Echinus Geyser
・ Echinus gilchristi


Dictionary Lists
翻訳と辞書 辞書検索 [ 開発暫定版 ]
スポンサード リンク

Echinothrix calamaris : ウィキペディア英語版
Echinothrix calamaris

''Echinothrix calamaris'', known commonly as the banded sea urchin or double spined urchin among other vernacular names, is a species of sea urchin in the family Diadematidae.
==Description==
The Banded sea urchin has a slightly oval test (shell), reaching a diameter of about 5 cm.〔
Like almost all the Diadematidae (but it is in ''Echinothrix calamaris'' that it is most obvious) it has two different sets of spines, shorter and slender closed spines which are going from yellow to dark (through brown) in colour and can deliver a nasty sting, and longer and thicker spines that are often banded with light and dark colour (but sometimes all dark or all white), and reaching 10 to 15 cm in length.〔(''Echinothrix calamaris'' )〕
These radiolas can be blunt, and are hollow. The spines are grouped so as to let appear five naked zones on the central part of the test, in a star pattern (called "iridophores"): this pattern can be colored, often in blue.〔
The anal papilla is big, more or less translucent and very obvious on the aborale face; it is generally whitish and speckled with black and white dots, circled by a ring of visual receptors that grant it a rudimentary vision.

Image:Double-spined sea urchin.jpg|The most common form
Image:43-EastTimor-Dive Tasi-Tolu 03 (Sea urchin)-APiazza.JPG|The two types of spines are very different
Image:Echinothrix calamaris1.jpg|The 5-fold symmetry and blue iridophores are obvious on this picture
Image:Echinothrix calamaris.JPG|Specimen with white primary spines.
Image:SeaDSC01286.JPG|Darker form

In his darkest forms, it can be confused with its cousins ''Diadema setosum'' or ''Diadema savignyi'' (which can both keep banded radiola when adults) ; however the latter is bigger, more uniformly black, has less discernible secondary radioles and is recognizable in five characteristic white points at the top of its test as well as in orange-colored circle around its anus.
The most common confusion is with the very close species ''Echinothrix diadema'', which can have banded spines when yound. But ''E. diadema'' has a very small anal papilla, all black, and the spines have a blue sheen ; the primary radiolas of ''E. calamaris'' are more fragile too, and can be crushed between two fingers (they are hollow), what is not the case for ''E. diadema''.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Echinothrix calamaris」の詳細全文を読む



スポンサード リンク
翻訳と辞書 : 翻訳のためのインターネットリソース

Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.