166 



Table 5. -Characters used to analyze relationships among species of Ageneiosidae. 

 The plesiomorphic state is followed by the apomorphic state(s). 

 Character numbers correspond to those in Table 6. 



1. Hyomandibula sutured to metapterygoid (0); hyomandibula not separated from metapterygoid by 

 dorsomedial laminar ossification of quadrate (1). 



2. Nasal bone not bifiircated (0); nasal bone bifurcated, lateral canal ossified basally (1). 



3. Vomer with anterolateral processes (0); vomer broadly rounded anteriorly, without angular 

 projections (1). 



4. Dermal component of first dorsal-fin pterygiophore forming prominent nuchal plate sutured to 

 supraoccipital (0); no nuchal plate formed from first dorsal-fin pterygiophore (1). 



5. Postcleithral process moderately to strongly developed (0); postdeithral process absent (1). 



6. Third basal radial of pectoral fin not expanded (0); third pectoral-fin basal radial expanded and 

 supporting many fin rays (1). 



7. Anteromedial tips of first two hypobranchials approximately straight and perpendicular to axis of 

 branchial basket (0); anteromedial tips of first two hypobranchials concave and obliquely angled 

 anteromedially (1). 



8. Second epibranchial not enlarged (0); medial tip of second epibranchial expanded and covering 

 first epibranchial dorsally (1). 



9. Urohyal without dorsomedial process between hypohyals (0); process of urohyal projecting 

 dorsomedially between hypohyals (1). 



10. Anterior ossification of ceratohyal separated from ventral ossification by bar of cartilage (0); 

 anterior ossification of ceratohyal sutured to ventral ossification along ventromedial margin (1). 



11. Ventral surface of palatine smooth (0); ossified spUnt on ventral margm of palatine (1). 



12. Two pairs of chin barbels not oriented transversely near lower Up (0); two pairs of chin barbels 

 arranged transversely near lower lip i\\. 



13. Lacrimal free or loosely associated with mesethmoid and lateral ethmoid, and without ventral 

 ossified process (0); lacrimal sutured to lateral ethmoid and mesethmoid, and with a spinous 

 ossification extending ventrally from canal-bearing portion of bone (1). 



14. Ventral surface of basipterygium flat or nearly so (0); basipterygium convex dorsally (1). 



15. Palatine not expanded in either sex (0); palatme of nuptial males expanded anteriorly (1). 



16. Maxillary barbel without ossified central core (0); maxillary barbel with ossified central core (1). 



17. Pterosphenoid formmg part of anterior margin of trigeminofacialis foramen (0); pterosphenoid 

 excluded from contact with anterior margin of trigeminofacialis foramen (1). 



