| 翻訳と辞書 |
| Parborlasia corrugatus ： ウィキペディア英語版 |
Parborlasia corrugatus
''Parborlasia corrugatus'' is a proboscis worm in the family Cerebratulidae.〔(Giant Antarctic Marine Worm – Parbolasia Corrugatus : Zooillogix )〕 This species of proboscis or ribbon worm can grow to in length, and lives in marine environments down to . This scavenger and predator is widely distributed in southern oceans.
==Description==
''Parborlasia corrugatus'' is smooth and flat. Adults measure , with a diameter of approximately . Specimens can weigh up to . Their colouration is variable, ranging from cream through various tones of black.〔Peter Brueggeman. (''Nemertina, proboscis worms – Underwater Field Guide to Ross Island & McMurdo Sound, Antarctica'' )〕 This worm has a wedge-shaped head containing a cavity filled with fluid. It uses this to fire an adhesive, barbed proboscis as a means of defense, and to capture prey.〔 This organ has adhesive secretion to aid in securing its meal.
Although this creature does not have a dedicated respiratory system, ''Parborlasia corrugatus'' is able to obtain oxygen by absorbing it through its skin. An animal of its size would typically find it difficult to receive enough oxygen this way, but this worm has a low metabolic rate, and also enjoys the advantage of its environment, which is cold, oxygen-rich Antarctic waters. When ''Parborlasia corrugatus'' experiences lower levels of oxygen in the water, it flattens and elongates its body to aid in the uptake of oxygen by increasing its skin area. This manoevre also reduces the distance that the oxygen must travel to diffuse into its body.〔
Potential predators avoid this species as it has a chemical defense: acidic mucus with a pH 3.5.〔
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「Parborlasia corrugatus」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.
|
|