| 翻訳と辞書 |
| Hydractinia symbiolongicarpus ： ウィキペディア英語版 |
Hydractinia symbiolongicarpus
''Hydractinia symbiolongicarpus'' is one of the 30 + ''Hydractinia'' species known worldwide. This saltwater animal, from here on referred to as ''Hydractinia'', is at the base of the Cnidaria phylum and in many ways, is similar to the freshwater ''Hydra''. In the wild, ''Hydractinia'' feed on smaller invertebrates found in the shallow mud, however in laboratory environments they are fed brine shrimp. ''Hydractinia symbiolongicurpus'' and its sibling species, ''Hydractinia echinata'', are the two species from the ''Hydractinia'' genus upon which most work has been published.
== Description ==
''Hydractinia'' consist of a network of gastrovascular canals embedded in a plate of tissue called the mat. When gastrovascular canals extend outside of the mat, they are called stolons. The stolon tips on the outer edge of the colony secrete SIF (Stolon Inducing Factor) allowing for the creation of branching stolons In the field, colonies exhibit morphologies that range from highly stoloniferous to completely stolonless. Four types of polyps are found on ''Hydractinia'' colonies, including feeding polyps, sexual polyps, and two other types of polyps called dactylozooids and tentaculozooids, which protect the colony. Nematocyte precursors migrate into feeding polyps and germ cells migrate into sexual polyps. Nerve cells are found in all parts of the colony. While ''Hydractinia'' do not have a bodily axis of symmetry, the polyps exhibit oral/aboral symmetry. In the planula stage, the ''Hydractinia'' exhibit anterior/posterior symmetry.
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「Hydractinia symbiolongicarpus」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.
|
|