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03 November 2005

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Hai~Ren

Very nice Fascinating to see that atyid shrimps can parallel African cichlids in terms of diversity and how they've fanned out to fill all the various ecological niches.

I wonder if there are other species of freshwater prawns or shrimp in Sulawesi as well (_Macrobrachium_?) Then it'd be interesting to see how these more generalist/opportunist species have diversified compared to the grazing/filter-feeding atyids.

Sulawesi has always been a fascinating place for me, a crossroads between Asia and Oceania, where cuscus and megapodes live alongside macaques, pigs and dwarf buffalo.

monkey

erm actually i thought it was the snail that had the african cichilid's allopatric speciation type diversity and the shrimp that was pretty tame due to its mobility

hmm i must have misunderstood the lady again :|

Ranmasatome

I think hte las statement just means that all the shrimps come from one common ancestor.. so the species linkages are clearer, hence higher resoulution.

the snails on the other hand probably evolved from 2 or more common ancestors...and formed 2 separate branches individually so genetic work and species linkages between the species is harder to work out and hence a lower resoultion.

i actually would expect the snails to be paraphyletic.. but its was quite surprising to find that they are actualy a polyphylectic group..wow.:)

monkey

ooooooooo ranmasatome: thanks! that really makes things clearer :)
it does fit the definition of allopatric speciation so much better
so erm what is paraphyletic and polyphyletic? :P

Hai_Ren

Paraphyletic - A non-monophyletic grouping. A grouping that does not include all the descendants. For example, a Primates that included apes, monkeys and lemurs but not tarsiers and loris would be paraphyletic.

Polyphyletic - groupings of organisms that are not closely related and do not accurately reflect relationships. For example, a "Thalassomammalia" consisting of seals, whales and sirenians is polyphyletic.

monkey

orhhh that was helpful
thanks :P

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