Definition of crossopterygian in English:

crossopterygian

noun

Zoology
  • A lobe-finned fish, such as the coelacanth.

    • ‘The sarcopterygians include the lungfish, together with the crossopterygians, which are composed of coelacanths and the extinct rhipidistians.’
    • ‘The coelacanths were a side group of crossopterygians who evolved along separate lines from the rhipidistians in the Devonian.’
    • ‘‘Amphibians’ were held to be descended from rhipidistian crossopterygians and the closest living relative of amphibians was coelacanths.’
    • ‘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.’
    • ‘These similarities have prompted evolutionists to confidently declare that crossopterygians evolved into tetrapods.’

adjective

Zoology
  • Relating to crossopterygians.

    • ‘Large Bothriolepis plates were scattered around through the rocks with abundant crossopterygian bones and scales in the top units.’
    • ‘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.’

Origin

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

Pronunciation:

crossopterygian

/ˌkrɒsɒptəˈrɪdʒɪən/