Biologia i diversitat de vertebrats/Introducció al grup vertebrats/Classificació actual

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La classificació cladística acceptada actualment és la següent:


Chordata

Urochordata


____

Cephalochordata


Vertebrata


Myxini


______

Cephalaspidomorphi


Gnathostomata
Chondrichthyes

Elasmobranchia



Holocephali



Teleostomi

Actinopterygii


__________

Sarcopterygii


Tetrapoda

Amphibia


Amniota
Synapsida

Mammalia


Sauropsida
Anapsida

Testudines



Diapsida

Lepidosauria


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Sovint, però, es parla de diferents grups sense rang cladístic per facilitar l'estudi comparat. Els més utilitzats són els següents:

  • Ostracoderms: s'utilitza per agrupar els agnats fòssils amb exoesquelet. Es considera parafilètic o polifilètic.
  • Rèptils: Nom popular que engloba tots els sauròpsids a excepció de les aus. És un conjunt parafilètic
  • Amfibis: Hi ha qui el considera parafilètic, al no incloure els amniotes.
  • Anamniotes: S'utilitza per agrupar tots els vertebrats no amniotes. És un conjunt parafilètic.

Segons el registre fòssil, s'ha deduït una filogènia dels vertebrats relativament sòlida. Tot i això hi ha diversos buits i inconnexions que romanen a l'espera de nous estudis.

Segons Janvier (1978), el clade principal seria el següent[1]:

Craniats

Vertebrats

Ciclostomats



Gnatostomats





Hyperotreti (mixinoïdeus)





Referències[modifica]

  1. Tree Of Life web project