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Arthropod

Arthropod

(Science: biology, zoology) The largest phylum of the animal Kingdom, containing several million species. Arthropods are characterised by a rigid external skeleton, paired and jointed legs and a haemocoel. The phylum arthropoda includes the major classes insecta, crustacea, Myriapodia and arachnida.


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homology examples

Consider the arthropod features they have in common - and chelicerae aren't on the list.

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by Darby
Tue Aug 03, 2010 3:10 pm
 
Forum: Zoology Discussion
Topic: homology examples
Replies: 3
Views: 2886

homology examples

... what is homologoues that they both have? I have been looking for homologies between insects and spiders but didn't find much. I found someting on arthropod comound eyes but it's all contraversial. I am thinking it has to be in their chelicerata, or mouthparts.

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by artelart
Mon Aug 02, 2010 11:17 am
 
Forum: Zoology Discussion
Topic: homology examples
Replies: 3
Views: 2886

Re: Chitinous

Sounds right on everything that I've seen (which doesn't cover half of what you put). I know a large portion of arthropod deaths occur during molting, so having to shed it is a definite drawback, but given the distribution of arthropods, saying its still a net benefit is an huge ...

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by Chroma
Sat Oct 24, 2009 7:25 pm
 
Forum: Zoology Discussion
Topic: Chitinous
Replies: 6
Views: 5149

Chitinous

... way of attaching outside. But because the exoskeleton is much heavier than an internal one, its weigth increases proportionally: the bigger the arthropod, even heavier the exoskeleton - and soon it gets heavier than there is availbale space for additional muscle and thus the whole animal would ...

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by biohazard
Thu Oct 22, 2009 7:48 am
 
Forum: Zoology Discussion
Topic: Chitinous
Replies: 6
Views: 5149

The Colin Leslie Dean species paradox

... like a cat, a dog, a mouse, or a tiger. All told, around 800,000 species have been identified in the Animal Kingdom -- most of them in the Arthropod phylum. In fact, some scientists believe that if we were to identify all species in the tropical rain forests the ranks of Arthropoda would ...

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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: 172985
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