35 m; 3 subclasses: Ctenidiobranchia (Nuculida), Palaeobranchia (Solemyida), Autobranchia (lamellibranch and septibranch bivalves); about 6,000 marine and 2,000 limnic species. Class Scaphopoda (Solenoconcha; tusk shells) Midventrally fused mantle and tubiform to barrel-shaped shell; head with tubular snout
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