Abantennarius drombus

Lore & Background

The freckled frogfish was first formally described in 1903 and originally classified with Antennarius coccineus by American ichthyologists David Starr Jordan and Barton Warren Evermann, with its type locality given as Waikiki on Oahu in Hawaii. It was later re-identified by Norton Chang of the Waikiki Aquarium using literature by Pietsch and Grobecker and Tinker's Fishes of Hawaii. The key difference between A. coccineus and A. drombus is the number of pectoral fin rays: A. drombus has 12, while A. coccineus has 10. Additional distinguishing characteristics include the color of the esca and the abundance of small dark blotches on the body and fins. In 1987, Pietsch and Grobecker synonymized A. drombus with A. coccineus, but it has subsequently been regarded as a valid species. The 5th edition of Fishes of the World classified Abantennarius in the family Antennariidae within the suborder Antennarioidei, nested in the order Lophiiformes, the anglerfishes.

The fish is found in shallow waters on coral and rocky reefs, dwelling at the bottom of spur and groove habitats. Its coloration varies from brown to reddish brown or gray, typically marked with small dark blotches—the 'freckles' that give it its common name—which are especially obvious on the fins. The illicium (modified first dorsal spine) is about the same length as the second dorsal spine, and the second dorsal fin is not connected to the head with a membrane. There is no caudal peduncle. The esca is not white, unlike in A. coccineus where it is white. The body shape and fin composition measure this species' standard length to be roughly 12 cm.

Reader's Guide

The freckled frogfish is notable primarily for its extreme rarity in scientific observation and its endemic status within the Hawaiian archipelago and nearby atolls. Because of the fish's expertise in camouflage and small range, there have been few instances of observation and study, so its description is heavily inferred from order, family, and genus information. Its distinguishing fin characteristics—3 dorsal spines, 12 soft rays in the second dorsal fin, 7 soft rays in the anal fin, and 12 pectoral fin rays—help separate it from the similar A. coccineus. The species was synonymized with A. coccineus in 1987 but later regarded as valid, reflecting ongoing taxonomic uncertainty. Its biology, behavior, and life history are largely unknown from direct study, but family-level inferences suggest it clambers across substrates using leg-like fins, remains stationary for long periods, and uses its illicium as a lure to capture prey via gape and suck feeding. Mating behavior is predicted from observations of the related hairy frogfish, including color changes, fin displays, and egg fertilization within a mucus band. Unlike many fish, frogfish are not featured in folklore, historical narratives, or art, and are celebrated only for their unusual appearance.

Did You Know?

• The freckled frogfish was originally classified with the scarlet frogfish (Antennarius coccineus) by David Starr Jordan and Barton Warren Evermann.
• The specific name drombus was not explained, and it is not known what David Starr Jordan meant by it.
• This species has a maximum published standard length of 12 cm (4.7 in).