Maxillopoda

Maxillopoda

Maxillopoda
Temporal range: Cambrian to Recent
Cyclops (Copepoda: Cyclopoida)
Scientific classification
Kingdom:
Animalia
(unranked):
Panarthropoda
Phylum:
Arthropoda
Subphylum:
Crustacea
Class:
Maxillopoda

Dahl, 1956 [1]
Sub-classes

Maxillopoda was a diverse class of crustaceans which includes the barnacles, copepods and a number of related animals. It is now an obsolete taxon, this means the class is no longer used. Dna testing has shown that many members in this group are not closely related to each other.

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

Description

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

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

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

Wikimedia Commons has media related to Maxillopoda.
  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. CRC Press. 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.

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