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Mesoneura (gastropod)
From Wikipedia, the free encyclopedia
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Mesoneura is an infraclass of gastropods in the subclass Heterobranchia.[1]
They are the sister group to Euthyneura, and show intermediate characteristics between lower heterobranchs and euthyneurans.
Four families are included in Mesoneura: Tjaernoeiidae, a family of minute deep-sea snails with coiled shells, Parvaplustridae, a family of deep-sea snails with bubble-like shells, Murchisonellidae, one of the most ancient families of snails, and Rhodopidae, a family of worm-like sea slugs.
Molecular clock analysis suggests that Mesoneura diverged from Euthyneura approximately 359 million years ago, with a 95% confidence interval of 406–307 million years ago. The earliest fossil murchisonellids are known from rocks dated to between 350 and 260 million years ago.[2]
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