| 翻訳と辞書 |
| Cyrtopleura costata ： ウィキペディア英語版 |
Cyrtopleura costata
''Cyrtopleura costata'' or the angel wing clam is a bivalve mollusc in the family Pholadidae. It is found in shallow parts of the northwest Atlantic, living in the seabed, where it burrows through sand and mud to a depth of up to .〔(''Cyrtopleura costata'' ) Smithsonian Marine Station. Retrieved 2011-11-30.〕
==Description==
''Cyrtopleura costata'' has a pair of brittle, asymmetric white valves and can grow to about in length. The anterior end is elongated and has a rounded point which is used for digging through the substrate. The posterior end is truncated and rounded and near the beak has an apophysis, a wing-like flange, which helps provide an attachment for the foot muscles. On the anterior side of the beak, the margin is smooth and bent slightly upwards. The whole valve has finely sculptured radial ribs which intercept with a series of concentric growth rings parallel with the margin. In the living animal, the valves are covered by the periostracum, a thin grey protective layer. This coating has usually been abraded when the empty shells are washed up on the beach, and the valves are usually found singly because the muscles that hold them together are weak. Internally, the live mollusc has a powerful muscular foot and a pair of long, fused siphons. These siphons are unable to retract back into the shell and as a result, the two valves permanently gape apart.〔(Angel Wings: Look for the “Spoon” ) Retrieved 2011-11-30.〕
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「Cyrtopleura costata」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.
|
|