| 翻訳と辞書 |
| Emerita analoga ： ウィキペディア英語版 |
Emerita analoga
''Emerita analoga'', the Pacific sand crab or Pacific mole crab, is a species of small, sand-burrowing decapod crustacean found living in the sand along the temperate western coasts of America.〔 It is found on exposed sandy beaches in the swash region of the intertidal zone.
==Description==
The Pacific sand crab is a small crab growing up to long and wide. The female is nearly twice as large as the male and may be identified by the orange egg mass often carried under the telson. The adult is sand-coloured and well camouflaged, and has no claws or spines. It has five pairs of legs and three pairs of pleopods. The crab moults periodically, so its exoskeleton may be found washed up on the beach.
The sand crab is well adapted to life in the sand, which presents an unstable substrate, and its shape is an elongated-dome shape designed for fast burrowing. The eyes are on long stalks and the antennules are also elongated so as to project above the surface of the sand. These form a tube which channels water downwards through the gills. The much longer antennae are retractable. When water is overhead, they also project above the sand surface to collect food particles. The legs and uropods have hairy margins to assist in digging and for use in collecting food and transferring it to the mouth.
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「Emerita analoga」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.
|
|