Randall's frogfish
A small Indo-Pacific frogfish with a filamentous lure.
Randall's frogfish (Antennarius randalli) is a marine ray-finned fish in the frogfish family Antennariidae, found across the Indo-Pacific region.
American ichthyologist Gerald R. Allen first described the species in 1970. The type specimen came from off Motu Tautara on Easter Island. Within the genus Antennarius, it belongs to the pauciradiatus species group, alongside A. pauciradiatus. According to the 5th edition of Fishes of the World, the genus Antennarius sits in the family Antennariidae, suborder Antennarioidei, order Lophiiformes—the anglerfishes.
The genus name Antennarius combines "antenna" with the suffix -ius, referring to the first dorsal spine, which is modified into a snout tentacle used as a lure. The specific name randalli honors John Ernest Randall of the Bishop Museum, who enabled Allen to join the 1969 Easter Island expedition where the holotype was collected.
This frogfish has a short illicium with thin filaments and an esca (lure) split into several thin strands. Two white spots appear on the caudal fin, with additional white spots behind the eye, near the pectoral fin, and at the base of the dorsal fin. The second and third dorsal spines are connected by a membrane that forms a pocket for the esca. The dorsal fin contains 12 or 13 soft rays, and the anal fin has 7. Maximum recorded standard length is 8 cm (3.1 in).
The species ranges across the Indo-Pacific, from the Cocos (Keeling) Islands, Indonesia, and Papua New Guinea east to the Marquesas Islands and Easter Island. In 2020, it was recorded in the Gulf of Aqaba in the northern Red Sea. It lives from the surface down to 53 m (174 ft), in rubble and rocky habitats, often near coral reefs and algae.
Quick Facts
- Taxon
- Antennarius randalli
Facts from the source article.
Lore & Background
Randall's frogfish was first formally described in 1970 by the American ichthyologist Gerald R. Allen, with its type locality given as off Motu Tautara, Easter Island. Within the genus Antennarius, it belongs to the pauciradiatus species group, along with A. pauciradiatus. The 5th edition of Fishes of the World classifies the genus Antennarius in the family Antennariidae within the suborder Antennarioidei within the order Lophiiformes, the anglerfishes.
The genus name Antennarius suffixes -ius to antenna, an allusion to the first dorsal spine being adapted into a tentacle on the snout used as a lure to attract prey. The specific name honours John Ernest Randall of the Bishop Museum, who enabled Allen to participate in the 1969 expedition to Easter Island on which the holotype was collected.
Randall's frogfish has a short illicium with thin filaments and an esca, or 'lure', which is split into several thin filaments. There are two white spots on the caudal fin and other white spots to the rear of the eye, near the pectoral fin, and one at the base of the dorsal fin. The second and third dorsal spines are connected by a membrane, which forms a pocket for the esca.
Reader's Guide
Randall's frogfish is a notable member of the Antennariidae family due to its distinctive morphology and wide Indo-Pacific distribution. Its short illicium and filamentous esca, along with the membrane connecting the second and third dorsal spines that forms a pocket for the lure, illustrate the specialized anglerfish adaptation for attracting prey. The species is recorded from the Cocos (Keeling) Islands, Indonesia, and Papua New Guinea east to the Marquesas Islands and Easter Island, with a 2020 record from the Gulf of Aqaba in the northern Red Sea. It inhabits rubble and rocky habitats from the surface down to 53 meters, often in association with coral reefs and algae. The specific name honors John Ernest Randall, reflecting the importance of museum collections and field expeditions in documenting biodiversity. Its maximum standard length of 8 cm places it among the smaller frogfishes, and its white spotting pattern aids in identification. The species' inclusion in the pauciradiatus group underscores its taxonomic relationships within the genus Antennarius.
Did You Know?
- The esca, or lure, is split into several thin filaments.
- It has been recorded from the Gulf of Aqaba in the northern Red Sea as of 2020.
Frequently Asked Questions
What is Randall's frogfish?
Randall's frogfish (Antennarius randalli) is a small, ray-finned anglerfish native to the Indo-Pacific. It sits in the family Antennariidae and is grouped with A. pauciradiatus in the pauciradiatus species group.
How big does Randall's frogfish get?
At most, this species tops out around 8 centimeters (about 3.1 inches) in standard length. It has been recorded from the surface all the way down to roughly 53 meters.
Where can you find Randall's frogfish?
This frogfish ranges across the Indo-Pacific, and the very first specimen was pulled from waters off Motu Tautara near Easter Island. It has been observed at depths from the surface to about 53 meters.
Who described Randall's frogfish and when?
Gerald R. Allen, an American ichthyologist, gave the species its formal name back in 1970. The holotype came from a collection site off Motu Tautara, Easter Island.
What sets Randall's frogfish apart from other Antennarius species?
It sports a filamentous lure and carries 12 or 13 soft dorsal-fin rays, traits that help ichthyologists slot it into the pauciradiatus group. Its small size and Indo-Pacific range also help separate it from larger congeners.
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