Concavus

Concavus
Temporal range: Early Miocene–Early Pleistocene[1][2]
Fossil of Concavus concavus
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Subphylum:
Crustacea
Class:
Maxillopoda
Subclass:
Thecostraca
Infraclass:
Cirripedia
Order:
Sessilia
Family:
Balanidae
Subfamily:
Concavinae
Genus:
Concavus

Newman, 1982[3][4]
Type species
†Balanus concavus
Bronn, 1831[lower-alpha 1]

Concavus is a genus of barnacles.[4]

Species

As of 2017, WoRMS recognizes the following two species:[4]

Taxonomic history

The genus was circumscribed by William A. Newman in 1982. His original list of subgenera and species for the genus was the following:[3]

  • Concavus Newman, 1982 genus
    • Concavus Newman, 1982 subgenus
      • †C. concavus (Bronn, 1831)
    • Menesiniella Newman, 1982 subgenus
      • C. (M.) aquila Pilsbry, 1916
      • C. (M.) regalis Pilsbry, 1916
    • Arossia Newman, 1982 subgenus
      • C. (A.) panamensis (Rogers, 1948)
        • C. (A.) p. panamensis (Rogers, 1948)
        • C. (A.) p. eyerdami (Henry, 1960)
      • C. (A.) henryae Newman, 1982

Newman noted there were multiple fossil taxa in this genus, but didn't classify any except for the type species †C. concavus.[3]

In 1992, Victor A. Zullo revised the genus. He created a new subfamily, Concavinae, with Tamiosoma Conrad, 1856 (the senior synonym of Menesiniella according to Zullo[lower-alpha 2]), Arossia and Concavus among its genera. With his revision, Concavus only consists of the two species C. concavus and C. crassostricola.[1]

Fossil records

This genus is known in the fossil records from the Oligocene to the Quaternary (age range: from 28.4 to 0.012 million years ago). Fossils are found in the marine strata of United States, Italy, Mexico, Morocco, Algeria, France, Haiti, Madagascar, Panama, Colombia and Slovenia.[7]

Notes
  1. Urszula Radwańska and Andrzej Radwański argue this species's author citation should be Darwin, 1854.[2]
  2. As of 2017, WoRMS recognizes both Tamiosoma and Menesiniella as valid, distinct genera.
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References
  1. Zullo, Victor A. (1992). "Revision of the Balanid Barnacle Genus Concavus Newman, 1982, with the Description of a New Subfamily, Two New Genera, and Eight New Species". Memoir (The Paleontological Society). 27: 1–46. JSTOR 1315604.
  2. Radwańska, Urszula; Radwański, Andrzej (2008). "Eco-taphonomy of mass-aggregated giant balanids Concavus (Concavus) concavus (Darwin, 1854) from the Lower Pliocene (Zanclean) of Rafina near Pikermi (Attica, Greece)". Acta Geologica Polonica. 58 (1): 93–94.
  3. Newman, William A. (1982). "A Review of Extant Taxa of the "Group of Balanus concavus" (Cirripedia, Thoracica) and a Proposal for Genus-Group Ranks" (PDF). Crustaceana. 43 (1): 25–36. doi:10.1163/156854082X00056. JSTOR 20103743.
  4. Chan, Benny K. K. (2017). "Concavus Newman, 1982". WoRMS. World Register of Marine Species. Retrieved 30 September 2017.
  5. Bronn, Heinr. G. (1831). Italiens Tertiär-Gebilde und deren organische Einschlüsse. Heidelberg: Karl Gross. p. 127.
  6. Zullo, Victor A. (1984). "New Genera and Species of Balanoid Barnacles from the Oligocene and Miocene of North Carolina". Journal of Paleontology. 58 (5): 1328–1330. JSTOR 1304855.
  7. Fossilworks


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