Dictionary » A » Annelida


The annelids, are a large phylum of animals comprising the segmented worms, with about 15,000 modern species including the well-known earthworms and leeches. They are found in most wet environments, and include many terrestrial, freshwater, and especially marine species (such as the polychaetes), as well as some which are parasitic or mutualistic. They range in length from under a millimeter to over 3 meters (the seep tube worm Lamellibrachia luymesi).

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Book recommendation for exam

... relation to man. 7. Nemathelminthes : General features, life history and parasitic adaptation of Ascaris; nemathelminths in relation to man. 8. Annelida : Coelom and metamerism; modes of life in polychaetes; general features and life history of nereis (Neanthes), earthworm (Pheretima) and leach ...

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by bertstare
Sun Oct 21, 2012 2:19 pm
Forum: Zoology Discussion
Topic: Book recommendation for exam
Replies: 3
Views: 8489

Re: Theories - Origin of Life

... you are aware are you not, that fossils of soft body organisms do appear quite extensively in the Cambrian layer. Soft-bodied phyla, such as Annelida, Onycophora and Priapulida, which do not have mineralized skeletons, make their appearance in the early Cambrian of Chengjiang, Yunnan Province ...

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by scottie
Mon Nov 14, 2011 6:47 pm
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 563
Views: 1127890

Segmentation in different Phyla

There has been discussion over whether segmentation was evolved independently in the phyla Arthropoda, Annelida and Chordata. Does anyone know any reasons behind why this hypothesis has come about due to body structure? Is it different functions of the segmentation or just ...

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by smithy2192
Wed Aug 11, 2010 9:44 am
Forum: Evolution
Topic: Segmentation in different Phyla
Replies: 3
Views: 3187

earthworm phylum annelida

Why earthworm dies when we sparkle salt around its body or upon it??

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by samiah
Sat Sep 12, 2009 4:54 am
Forum: Zoology Discussion
Topic: earthworm phylum annelida
Replies: 2
Views: 2058

The Colin Leslie Dean species paradox

... backbones (fish, birds, mammals, reptiles, amphibians). There is also Arthropoda (insects, spiders, crustaceans); Mollusca (snails, squid, clam); Annelida (segmented worms); Echinodermata (starfish, sea urchins) and many, many more. http://en.wikipedia.org/wiki/Species Total number of species ...

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by gamila
Wed Jul 15, 2009 12:45 pm
Forum: Evolution
Topic: The Colin Leslie Dean species paradox
Replies: 135
Views: 186380
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