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Chelicerata

Chelicerata
'n Hoefysterkrap
Wetenskaplike klassifikasie
Koninkryk:
Filum:
Subfilum:
Chelicerata
Klasse
  • Arachnida
  • Merostomata
  • Pycnogonida (sien teks)
'n Spinnekop

Chelicerata is 'n subfilum van die geleedpotiges (Arthropoda). Die subfilum bestaan uit slegs twee biologiese klasse, naamlik Arachnida en Merostomata.

Arachnida (spinnekopagtiges) is 'n groot en suksesvolle grondlewende groep, wat die spinnekoppe, skerpioene en hul verwantes insluit.

Merostomata sluit die hoefysterkrap (Xiphosura) en die uitgestorwe seeskerpioene (Eurypterida) in. Die hoefysterkrap is 'n klein, ou groep wat vir miljoene jare relatief onveranderd oorleef het. Groepe soos hierdie word dikwels lewende fossiele genoem.

Die seespinnekoppe (Pycnogonida) kan moontlik aan die Chelicerata-subfilum behoort. Daar is genetiese bewyse wat dui dat hulle 'n ou sustergroep van al die ander lewende geleedpotiges kan wees.[1] Daar is ongeveer 1 300 seespinnekopspesies.

Chelicerata het as seediere ontstaan. Die eerste bevestigde fossiele dateer 445 miljoen jaar terug tot die laat Ordovisium-tydperk. Hoewel net vier mariene spesies oorleef het, almal van hulle hoefysterkrappe, is daar meer as 77 000 spesies wat lug inasem, en daar kan soveel as 500 000 onbekende spesies wees.[2][3]

Chelicerata is grootliks karnivories. Sommiges is egter heterotrofies, en leef van materiale wat deur ander organismes vervaardig word.

Verwysings

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  1. Regier J.C. (25 Februarie 2010). "Arthropod relationships revealed by phylogenomic analysis of nuclear protein-coding sequences". Nature. 463 (7284): 1079–1083. doi:10.1038/nature08742. PMID 20147900. our phylogeny […] only marginally favoured Chelicerata over the alternative of a more basal placement of Pycnogonida
  2. Margulis, Lynn and Schwartz, Karlene 1998. Five Kingdoms, an illustrated guide to the phyla of life on Earth. 3rd ed, Freeman. ISBN 0-7167-3027-8
  3. Ruppert E.E. Fox R.S. and Barnes R.D. 2004. Invertebrate Zoology 7th ed, Brooks/Cole.

Eksterne skakels

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Chelicerata
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