>Dear Mollusc-experts,
>
>
>
>It may be our traditional understanding that the anterior and posterior ends
>of clam-shaped sand-digging bivalves correspond with foot and siphon,
>respectively. These clams stay upside-down or bottom-end-up, so to speak,
>buried in sediments. Now, I wonder if this anterior-posterior system did
>correspond with the hox-gene expression in this group. Did anyone ever
>clarify this question?
>
>
>
>Masashi Yamaguchi
>Faculty of Science
>Univ. of the Ryukyus
>Nishihara, Okinawa
>903-0213  Japan

Burowing bivalves are anterior (foot) end down normally, though
Tellinidae may lie on their sides. That is, they "stand on their
noses".
--
Andrew Grebneff
Dunedin, New Zealand
64 (3) 473-8863
<[log in to unmask]>
Fossil preparator
Seashell, Macintosh & VW/Toyota van nut
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