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crossopterygian Syllabification: cros·sop·te·ryg·i·an
Pronunciation: /ˌkrôˌsäptəˈrijēən/

Definition of crossopterygian in English:


A lobe-finned fish, such as the coelacanth.
Example sentences
  • The sarcopterygians include the lungfish, together with the crossopterygians, which are composed of coelacanths and the extinct rhipidistians.
  • These similarities have prompted evolutionists to confidently declare that crossopterygians evolved into tetrapods.
  • One group of extinct crossopterygians, known as the rhipidistians, are the group thought by most to be the ones that successfully invaded land and gave rise to amphibians.


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Of or relating to crossopterygian fishes.
Example sentences
  • Latimeria is a ‘living fossil,’ a single surviving species of the old lineage of crossopterygian fishes.
  • After a light breakfast I studied a draft of a paper that we had just submitted on the new fossil crossopterygian fishes of the Aztec Siltstone.
  • Large Bothriolepis plates were scattered around through the rocks with abundant crossopterygian bones and scales in the top units.


Mid 19th century: from modern Latin Crossopterygii, from Greek krossos 'tassel' + pterux, pterug- 'fin'.

Definition of crossopterygian in:
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