(Alticorpus) macrocleithrum: long key, yes; the -cleithrum part refers directly to the large bone of the pectoral girdle that is called the cleithrum; ...
caudal fin symmetrical, supported internally by one epural; first pleural rib on second vertebrae rather than third; primitively, low-set pectoral girdle with a scalelike postcleithrum; an alveolar arm of the premaxillae; ...
Pectoral fins
the paired fins directly behind the head, attached to the pectoral girdle at the sides of the body.
Pelvic Fins
the paired ventral (towards the back) fins generally positioned between the pectoral and anal fins.
 See also: Fish, Taxonomy, Spine, Ventral, Species
  
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