Late 19th century; earliest use found in The Century Dictionary. Either from French opisthoglypheopisthoglyph + -ic, or from scientific Latin Opisthoglypha, former group name + -ic.
Definition of opisthoglyphic in US English:
opisthoglyphic
adjectiveəˌpɪsθəˈɡlɪfɪk
Zoology
= opisthoglyphous.
Origin
Late 19th century; earliest use found in The Century Dictionary. Either from French opisthoglyphe opisthoglyph + -ic, or from scientific Latin Opisthoglypha, former group name + -ic.