plagiostomeadj.n.
/ˈpleɪdʒɪəstəʊm/, U.S. /ˈpleɪdʒiəˌstoʊm/ Zoology.
A. adj.
Having the mouth placed transversely beneath the snout; spec. of or relating to the group Plagiostomi of cartilaginous fishes so characterized, including the sharks and rays. Now rare.
ΘΚΠ
the world > animals > fish > parts of fish > [adjective] > having mouth transversely beneath snout
plagiostome1835
plagiostomous1842
plagiostomatous1890
1835 R. Willis in Todd's Cycl. Anat. & Physiol. I. 115/1 The cartilaginous plagiostome fishes.
1887 Philos. Trans. 1886 (Royal Soc.) 177 689 In Holocephali..and Teleostei there is only one efferent artery to each gill, corresponding to the anterior of the two efferent arteries in the plagiostome holobranch.
1942 Q. Rev. Biol. 17 84/1 The hypophysis of the plagiostome fishes (herein to include all elasmobranch fishes except the Holocephali) has been investigated in this anatomical study.
B. n.
A cartilaginous fish of the group Plagiostomi; a shark, a ray.
ΘΚΠ
the world > animals > fish > subclass Elasmobranchii > [noun] > member of
plagiostome1842
1842 W. T. Brande Dict. Sci., Lit. & Art 931/1 Plagiostomes, Plagiostoma, a tribe of Cartilaginous fishes.
1851 Philos. Trans. (Royal Soc.) 141 694 The osseous tissue is full of areolæ of various forms, resembling those of the chondriform bones of Plagiostomes.
1860 J. Couch Hist. Fishes Brit. Islands I. 5 [The Sharks and] their kindred chondropterygians or plagiostomes—the Rays.
1923 Science 9 Nov. 362/1 The apparatus for maintaining equilibrium of the body in the amphioxus, cyclostome and plagiostome is not yet well developed.
1981 Systematic Zool. 30 378/2 I have also argued that dipnoans may be closer to plagiostomes than to teleostomes.
1993 Acta Zoologica 74 15 A vestigial and transitory naso-buccal connection in larvae of Neoceratodus..is shared with several plagiostomes.
This entry has been updated (OED Third Edition, June 2006; most recently modified version published online June 2022).
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adj.n.1835