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Tylerius new genus, is proposed for Spheroides spinosissimus Regan. It is distinguished from other tetraodontids by the following combination of characters: nasal papilla with two nostrils; dorsal eye rim only adnate; no ventrolateral skinfold; well developed upper and
lower lateral lines extending along body to caudal fin base. A new diagnosis is given for Amblyrhynchotes (Bibron) Duméril, to which Tylerius is closely related. The two genera differ in skull osteology, particularly in the ethmoid-frontal-parasphenoid region, and also
in a number of external morphological features.
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