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Three species assigned to the same nominal genus of Paleozoic xenacanthiform shark have been combined with the name    Orthacanthus   gracilis    (  Chondrichthyes  ,   Xenacanthiformes  ,   Orthacanthidae  ).    Orthacanthus   gracilis    (Giebel, 1848), which was originally combined as    Chilodus   gracilis    Giebel, 1848, is the senior synonym; it has priority over both    Orthacanthus   gracilis    (Newberry, 1857), which was originally combined as    Diplodus   gracilis    Newberry, 1857, and    Orthacanthus   gracilis    Newberry, 1875a. Proposed species-group replacement names are    Orthacanthus   lintonensis    nom. nov.  for    O.   gracilis    (Newberry, 1857) and    Orthacanthus   adamas    nom. nov.  for    O.   gracilis    Newberry, 1875a.    Chilodus   gracilis    Giebel, 1848 is designated as the type species of    Chilodus    Giebel, 1848; this species becomes the type species for    Giebelodus    Whitley, 1940, which is a replacement name for    Chilodus    Giebel, 1848 (preoccupied by    Chilodus    Müller &amp; Troschel, 1844,   Actinopterygii  ).    Giebelodus    Whitley, 1940 is a junior subjective synonym of    Orthacanthus    Agassiz, 1843.

zookeys

﻿Replacement names for two species of    Orthacanthus    Agassiz, 1843 (  Chondrichthyes  ,   Xenacanthiformes  ), and discussion of    Giebelodus    Whitley, 1940, replacement name for    Chilodus    Giebel, 1848 (  Chondrichthyes  ,   Xenacanthiformes  ), preoccupied by    Chilodus    Müller &amp; Troschel, 1844 (  Actinopterygii  ,   Characiformes  )