Maxillopoda

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Maxillopoda
Temporal range: Cambrian to Recent
Cyclops.jpg
Cyclops (Copepoda: Cyclopoida)
Scientific classification
Kingdom:
(unranked):
Phylum:
Subphylum:
Class:
Maxillopoda

Dahl, 1956 [1]
Sub-classes

Maxillopoda is a diverse class of crustaceans which includes the barnacles, copepods and a number of related animals.

It does not appear to be a monophyletic group, and no single character unites all the members.[2]

Description[change | change source]

With the exception of some barnacles, maxillopodans are mostly small,[3] including the smallest known arthropod, Stygotantulus stocki.[2] They often have short bodies, with the abdomen reduced in size, and generally lacking any appendages [3] This may have arisen through paedomorphosis.[3]

Apart from barnacles, which use their legs for filter feeding, most maxillopodans feed with their maxillae. Their bodyplan has 5 head segments, 6 thoracic segments and 4 abdominal segments, followed by a telson (tailpiece).[4]

Fossil record[change | change source]

The fossil record of the group extends back into the Cambrian, with fossils of barnacles and tongue worms known from that period.[5][6]

Classification[change | change source]

Six subclasses are generally recognised, although many works have included the ostracods among the Maxillopoda.[2] Of the six groups, only Mystacocarida are entirely free-living; all the members of the Tantulocarida, Pentastomida and Branchiura are parasitic, and many of the Copepoda and Thecostraca are parasites.

References[change | change source]

  1. "Maxillopoda". Integrated Taxonomic Information System. Retrieved October 7, 2010.
  2. 2.0 2.1 2.2 Joel W. Martin & George E. Davis (2001). An updated classification of the Recent Crustacea (PDF). Natural History Museum of Los Angeles County. p. 132. Archived from the original (PDF) on 2013-05-12. Retrieved 2011-09-12.
  3. 3.0 3.1 3.2 "Introduction to Maxillopoda". University of California, Berkeley. Retrieved December 31, 2009.
  4. Phil Myers (2001). ""Maxillopoda"". Animal Diversity Web. Retrieved December 31, 2009.
  5. B.A. Foster & J.S. Buckeridge (1987). "Barnacle palaeontology". In A.J. Southward (ed.). Crustacean Issues 5: Barnacle biology. pp. 41–63. ISBN 90-6191-628-3.
  6. Dieter Waloszek, John E. Repetski & Andreas Maas (2005). "A new Late Cambrian pentastomid and a review of the relationships of this parasitic group". Transactions of the Royal Society of Edinburgh: Earth Sciences. 96 (2): 163–176. doi:10.1017/S0263593300001280. S2CID 84859920.