| Family | Scientific Name | Author | Year | Common Name |
| Chaetodontidae | Prognathodes guyanensis | (Durand) | 1960 | Guyana Butterflyfish |
Prognathodes guyanensis
Unique Characters: Guyana Butterflyfish Prognathodes guyanensis. Snout shorter, more than 2.4 in head length. Eyeband blackish, not extending forward and ending on upper portion of snout. Body variously provided with bars or spots. Strong, dark blackish eyebands edged in light yellow extending from first 2 dorsal-fin spines to eye. Bands continue as weak stripes downward and forward below eye toward isthmus. Interorbital stripe present. Dark band extending from middle dorsal-fin spines backward across body to posterior anal-fin rays, extending onto fin to tips of rays. Second dark stripe extending through dorsal fin from posterior spines to upper portion of caudal peduncle.
Similar Species:
Longsnout Butterflyfish Prognathodes aculeatus
Bank Butterflyfish
Prognathodes aya
Longsnout Butterflyfish Prognathodes aculeatus. Snout moderately long, 2.1 to 2.3 in head length; eyeband orange in life, bordered with dark lines, passing forward below eye, ending on upper portion of snout; body without dark bars or spots.
Bank Butterflyfish Prognathodes aya. Snout shorter, more than 2.4 in head length. Eyeband blackish, not extending forward and ending on upper portion of snout. Body variously provided with bars or spots. Strong, dark blackish eyebands edged in light yellow extending from first 2 dorsal-fin spines to eye. Bands continue as weak stripes downward and forward below eye toward isthmus. Interorbital stripe present. Dark band extending from middle dorsal-fin spines backward across body to base of posterior half of soft anal-fin rays, but not extending much onto fin.
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