| 翻訳と辞書 |
Heloecius
''Heloecius cordiformis'' is a species of semiterrestrial crab found in mangrove swamps and mudflats along the east coast of Australia. Adults are around wide, with males being larger and having larger and more conspicuously coloured claws. The males wave their claws to communicate with other crabs, giving them their common name of semaphore crab. They can breathe both in air and under water, and feed at low tide on detritus in the sediment. ''H. cordiformis'' is the only species in the genus ''Heloecius'' and the family Heloeciidae.
==Description==
Adults of ''H. cordiformis'' are around wide, with a dark purple, mottled carapace. The compound eyes are on long eyestalks.
The claws are sexually dimorphic, with males' claws showing positive allometry, while females' claws grow isometrically; a male's claws thus become proportionally larger as the crab grows, becoming much larger than those of females. The colour of the claws is correlated with both sex and size. The smallest crabs have green claws, followed by orange and pink, with the largest male crabs having purple claws; females with purple claws have small claws.〔 The purple colour is the easiest of the four to distinguish against the reflectance spectrum of the mudflats on which the crabs live.〔
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「Heloecius」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.
|
|