(7) The central axis includes the paraglossal, basihyal
, and urohyal bones and articulates with the hyoid horns, comprising the ceratobranchial and epibranchial bones (Fig 4c).
Ceratohyal and basihyal cartilages of the second arch are absent.
As related to the hyobranchial skeleton, the the basihyal cartilage was not found in any Urotrygon species, which is considered as a synapomorphy.
(13) Compression of rostral basibranchial: The rostral basibranchial (basihyal
) was invariably compressed, but the degree of compression (ratio of height to width at the midpoint) varied.
subtriangular, width about 65% length; basihyal
cartilage about 10% basihyal
In the gill region, the basihyal
(bh) and ceratohyals (ch) lie anterior to the centrally located basibranchials (bb) and the three pairs of hypobranchials (hb).
Bollmannia and Antilligobius also both possess scales on the cheek and a spatulate basihyal
. The bright yellow stripe and blue colors of Antilligobius easily distinguish it from Bollmannia and Parrella which are drab brown with darker brown markings.
233.Peculiar articulation between prominent anteromesial process of anterior ceratohyal and broad, deep, circular concavity formed by the lateral margins of both urohyal and basihyal
.  Not present (e.g.
Hyobranchial apparatus: Comprising median unpaired glossohyal, basihyal
, three basibranchials and urohyal; and bilaterally paired dorsal and ventral hypohyals, anterior and posterior ceratohyals, interhyal, six branchiostegal rays, three hypobranchials, five ceratobranchials, four epibranchials and three pharyngobranchials (Fig.10).
subtriangular, width about 65 % length; basihyal
cartilage about 10 % of basihyal
Villiform teeth in band on premaxilla and dentary; 2-3 (1-2) rows on vomer; 2-3 rows on palatine; none on ectopterygoid, endopterygoid or basihyal
The interhyal and epihyal begin ossifying at 17 DPH followed by the ceratohyal and basihyal
at 23 DPH.