Land Snail Evolution?
Sep.03, 2010 in
Slugs and Snails
Any mollusc experts out there who know when the first land snail (or land slug) emerged on land from their aquatic ancestors?
Please don’t just link to the wikipedia site as I already looked there, it was rather vague.
September 20th, 2010 at 11:41 pm
“The most primitive pulmonates are the Ellobiidae,with genera like Ovatella,Leucophytia and Carychium.The Ellobiidae live in salt marshes and coastal mud-areas.Muddy waters often lack oxygen,so breathing with a lung coming to the surface was probably easier than breathing by a gill.”
http://members.tripod.com/arnobrosi/evolution.html
and,
“The earliest fossil pulmonate land snails date back over 300 million years to the Carboniferous period of North America and Europe, although there is some controversy as to whether these belong to primitive pulmonate families such as the Ellobiidae, or to more advanced families of the major terrestrial pulmonate group Stylommatophora.”
“The subclass Pulmonata evolved from opisthobranch (marine gastropod mollusks of the subclass Opisthobranchia) ancestors.”
http://www.answers.com/topic/pulmonata-1
http://weightlosshd.com
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October 11th, 2010 at 3:36 pm
I think I’m looking at one here!!!!
My big gas guzzling truck!!!
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