Conchifera

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Conchifera
Temporal range: Fortunian - Recent
Giant clam or Tridacna gigas.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Subphylum: Conchifera
Gegenbaur, 1878
Classes

Conchifera is a subphylum of the phylum Mollusca, containing five extant classes: Monoplacophora, Cephalopoda, Gastropoda, Bivalvia, and Scaphopoda. [1] [2] 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 ]

Contents

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, [3] [4] but other studies find scaphopods to be more closely related to cephalopods [5] or gastropods. [1]

Conchifera originated in the early Cambrian period. [1] [4]

Classes

Classes within the Conchifera include:

See also

References

  1. 1 2 3 4 5 Kocot, Kevin M.; Poustka, Albert J.; Stöger, Isabella; Halanych, Kenneth M.; Schrödl, Michael (2020). "New data from Monoplacophora and a carefully-curated dataset resolve molluscan relationships". Scientific Reports. 10 (1): 101. doi:10.1038/s41598-019-56728-w. ISSN   2045-2322. PMC   6952402 . PMID   31919367.
  2. ↑ Chen, Zeyuan; Baeza, J. Antonio; Chen, Chong; Gonzalez, Maria Teresa; González, Vanessa Liz; et al. (2025-02-28). "A genome-based phylogeny for Mollusca is concordant with fossils and morphology". Science. 387 (6737): 1001–1007. doi: 10.1126/science.ads0215 . ISSN   0036-8075.
  3. ↑ Runnegar, Bruce; Pojeta, John (1974-10-25). "Molluscan Phylogeny: The Paleontological Viewpoint: The early Paleozoic fossil record shows how living and extinct molluscan classes originated and diversified". Science. 186 (4161): 311–317. doi:10.1126/science.186.4161.311. ISSN   0036-8075. PMID   17839855.
  4. 1 2 Song, Hao; Wang, Yunan; Shao, Haojing; Li, Zhuoqing; Hu, Pinli; Yap-Chiongco, Meghan K.; Shi, Pu; Zhang, Tao; Li, Cui; Wang, Yiguan; Ma, Peizhen; Vinther, Jakob; Wang, Haiyan; Kocot, Kevin M. (2023-10-03). "Scaphopoda is the sister taxon to Bivalvia: Evidence of ancient incomplete lineage sorting". Proceedings of the National Academy of Sciences. 120 (40): –2302361120. doi:10.1073/pnas.2302361120. eISSN   1091-6490. hdl: 1983/edbbfb14-28f5-47ae-9189-ed00112ad1db . ISSN   0027-8424. PMID   37738291.
  5. ↑ Steiner, Gerhard; Dreyer, Hermann (2003). "Molecular phylogeny of Scaphopoda (Mollusca) inferred from 18S rDNA sequences: support for a Scaphopoda–Cephalopoda clade". Zoologica Scripta. 32 (4): 343–356. doi:10.1046/j.1463-6409.2003.00121.x. eISSN   1463-6409. ISSN   0300-3256.
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