Also found in: Thesaurus, Encyclopedia, Wikipedia.
Related to crossopterygian: Crossopterygii


Any of various lobe-finned fishes, including the coelacanths but usually not the lungfishes. No longer in scientific use.

[From New Latin Crossopterygiī, group name : Greek krossoi, fringe (from krossōtos, fringed, from krossai, projecting stone blocks) + Greek pterugia, fins, pl. diminutive of pterux, pterug-, wing; see pterygoid.]

cros·sop′te·ryg′i·an adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Animals) any bony fish of the subclass Crossopterygii, having fleshy limblike pectoral fins. The group, now mostly extinct, contains the ancestors of the amphibians. See also coelacanth
(Animals) of, relating to, or belonging to the Crossopterygii
[C19: from New Latin Crossopterygiī, from Greek krossoi fringe, tassels + pterugion a little wing, from pterux wing]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(krɒˌsɒp təˈrɪdʒ i ən)

1. any fish of the group Crossopterygii, extinct except for the coelacanth, and including the ancestors of amphibians and other land vertebrates.
2. pertaining to or resembling a crossopterygian.
[1860–65; < New Latin Crossopterygi(i) (< Greek kross(oí) tassels, fringe + -o- -o- + pterýgi(on) little wing or fin, diminutive of ptéryx, s. pteryg- wing, fin) + -an1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.crossopterygian - any fish of the order Crossopterygiicrossopterygian - any fish of the order Crossopterygii; most known only in fossil form
bony fish - any fish of the class Osteichthyes
Crossopterygii, subclass Crossopterygii - fishes having paired fins resembling limbs and regarded as ancestral to amphibians
coelacanth, Latimeria chalumnae - fish thought to have been extinct since the Cretaceous period but found in 1938 off the coast of Africa
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
On the fish-like tail in the ichthyostegid stegocephalians with descriptions of a new stegocephalian and a new crossopterygian from the Upper Devonian of East Greenland.
They also described a portion of the lower jaw of a probable rhipidistian (crossopterygian) fish; the first of its kind found in Michigan.
However, say the West German scientists, "Such coordination could indicate another preadaptation in the crossopterygian group that could have facilitated the transition to locomotion on land.'