Prognathodes falcifer

Scythe butterflyfish | Scythemarked Butterflyfish
Prognathodes falcifer
Prognathodes falcifer, Galapagos Islands, Ecuador, Photo: Graham Edgar


Tropical Eastern Pacific


Pale yellow with a distinctive right angle black marking on side, an oblique black band over eye and a black dorsal fin with two yellow spines. usually solitary and found on rocky, boulder strewn reefs.


Max Size: 15 cm

Sea Temperature Range: 15.6-29.6°C

Depth: 10-150m

Habitat Generalization Index: N/A

Also referred to as the SGI (Species Generalisation Index), this describes the habitat niche breadth of the species. Species with values less than 15 are found in a relatively narrow range of reef habitat types (specialists), while those over 25 may be found on most hard substrates within their range (generalists). Learn more here.

Conservation and Rarity

IUCN Status: Least Concern

Occurrence: Widespread (70% of sites)

Occurrence describes how often the species is found on surveys within its distribution. It is calculated as the % of reef sites surveyed by RLS divers across all the ecoregions in which the species has been observed

Abundance: Few (3 per transect)

Abundance is calculated as the average number of individuals recorded per RLS transect, where present.

Edit by: Joe Shields