Conchifera

Conchifera
Temporal range: Fortunian - Recent
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Subphylum: Conchifera
Gegenbaur, 1878 [1]
Classes

Conchifera is a subphylum of the phylum Mollusca, containing five extant classes: Monoplacophora, Cephalopoda, Gastropoda, Bivalvia, and Scaphopoda.[1] Conchiferans can bear a single shell as in snails and ammonites, a single pair of shells as in clams, or lack a shell as in slugs and squid. The other subphylum is Aculifera, the members of which are shellless or have a row of several plates. Non-monoplacophoran conchiferans emerged within the once-widespread Monoplacophora. The only descendant which retains its ancestral shape is the Tryblidiida.[clarification needed]

The monophyly of Conchifera is supported by molecular phylogenetic analysis.[1] The relationships among the members of Conchifera are disputed.[1] A grouping of Scaphopoda and Bivalvia, named Diasoma, has been proposed,[2][3] but other studies find scaphopods to be more closely related to cephalopods[4] or gastropods.[1]

Conchifera originated in the early Cambrian period.[1][3]

  1. ^ a b c d e Cite error: The named reference Kocot2020 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Runnegar1974 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Song2023 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Steiner2003 was invoked but never defined (see the help page).