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Arthropods

Arthropods

members of the phylum arthropoda of the animal Kingdom, composed of organisms having a hard, jointed exoskeleton and paired jointed legs, and including among other classes, the arachnida and insects, many species of which are important medically as parasites or as vectors of organisms capable of causing disease in man.


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On the number of limbs.

Four-finned ancestors, not too surprisingly, leads to four-limbed descendants. Arthropods have been a bit more flexible, but the general trend seems to have been toward leg loss, as in insects. Plus wings that did not start as legs.

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by Darby
Tue Feb 05, 2013 7:46 pm
 
Forum: Evolution
Topic: On the number of limbs.
Replies: 7
Views: 3834

Re:

... , but screwing with Hox genes in an insect? That can work. My guess would be this is why we see more variation in the number of limbs among arthropods. That's very interesting!!! :D Do you have more information about why it wouldn't produce a viable mammal?

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by elvex1
Tue Feb 05, 2013 3:20 am
 
Forum: Evolution
Topic: On the number of limbs.
Replies: 7
Views: 3834

On the number of limbs.

... but screwing with Hox genes in an insect? That can work. My guess would be this is why we see more variation in the number of limbs among arthropods.

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by Luxorien
Mon Feb 04, 2013 10:46 pm
 
Forum: Evolution
Topic: On the number of limbs.
Replies: 7
Views: 3834

Book recommendation for exam

... (Neanthes), earthworm (Pheretima) and leach (Hirudinaria). 9. Arthropoda : Larval forms and parasitism in Crustacea; vision and respiration in arthropods (prawn, cockroach and scorpion); modification of mouth parts in insects (cockroach, mosquito, housefly, honey bee and butterfly); metamorphosis ...

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by bertstare
Sun Oct 21, 2012 2:19 pm
 
Forum: Zoology Discussion
Topic: Book recommendation for exam
Replies: 3
Views: 6304

Evolution of the Face and Head

... step. This is called cephalisation, and happens convergently in many different animal groups. Why is it convergent and not evolved once? Well, arthropods and mammals are very very different: remember the jellyfish? what happens after that stage is crucial: mammals are deuterostoma (mouth second) ...

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by stauffie
Mon May 07, 2012 12:42 am
 
Forum: Evolution
Topic: Evolution of the Face and Head
Replies: 4
Views: 3878
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