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Prognathodes marcellae, commonly known as Marcella’s butterflyfish, is a species of marine fish belonging to the family Chaetodontidae, which includes butterflyfishes. Here are some key features and characteristics of Prognathodes marcellae:

1. Appearance: Marcella’s butterflyfish has a striking appearance with a predominantly black body and yellow markings. The dorsal fin and caudal fin are yellow, and there is a distinct yellow band that runs diagonally across the body from the dorsal fin to the ventral side near the tail.
2. Size: They typically grow to a size of around 10-12 centimeters (4-5 inches) in length.
3. Habitat: This species is found in the tropical waters of the eastern Pacific Ocean, specifically along the coasts of Mexico and Central America. They inhabit coral reefs and rocky areas, often in areas with strong currents.
4. Behavior: Like other butterflyfish species, Prognathodes marcellae is diurnal, meaning it is active during the day. They feed primarily on coral polyps, small invertebrates, and algae.