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pycnodont
pycnodont n. and adj.
Brit. 
/ˈpɪknədɒnt/
, /ˈpɪknədɒnt/U.S. /ˈpɪknəˌdɑnt/
[probably after French pycnodontes, plural noun ( L. Agassiz Recherches sur les poissons fossiles (1833) II. 2); compare scientific Latin Pycnodus, genus name (1833 or earlier)] Palaeontology (a) n. any of various extinct holostean fishes of the family Pycnodontidae or order Pycnodontiformes, which are usually deep-bodied and characterized by a pavement of crushing teeth in the upper and lower jaws, and are known from fossils of the Mesozoic era; (b) adj. of, relating to, or belonging to this group of fishes./ˈpɪknəˌdɑnt/ΘΚΠ
the world > animals > fish > class Osteichthyes or Teleostomi > subclass Actinopterygii > [noun] > superorder Ganoidei > miscellaneous fossil types
pycnodont1836
sauroid1836
Cephalaspis1842
buckler-head1847
Pteraspis1857
lepidoganoid1861
coccosteid1863
the world > animals > fish > class Osteichthyes or Teleostomi > subclass Actinopterygii > [adjective] > ganoid > of fossil or extinct types of
pycnodont1836
cephalaspean1854
cephalaspidean1872
pteraspidian1872
platysomid1878
1836 W. Buckland Geol. & Mineral. I. xiv. 281 The habits of the family of Pycnodonts appear to have been omnivorous.
1909 Science 10 Sept. 328/1 In the earliest known Pycnodont fishes from the Lower Lias..the grinding teeth form an irregular cluster.
1966 A. S. Romer Vertebr. Paleontol. (ed. 3) v. 60/1 Apart from the problems concerning the semionotid and pycnodont groups, a major portion of the holosteans seems fairly certain to constitute a natural group.
1990 M. J. Benton Vertebr. Palaeontol. vi. 133 The pycnodonts of the Jurassic and Cretaceous are mostly deep-bodied forms with long dorsal and anal fins.
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as lemmas