Rhycherus
A genus of Australian endemic frogfishes with ragged appearance.
Rhycherus is a genus of marine ray-finned fish within the frogfish family Antennariidae, specifically placed in the subfamily Histiophryninae. These fish are found only in Australian waters. Some authorities, however, classify the genus in its own family, Rhycheridae, where it is the sole member, and refer to them as Balrog frogfishes.
The genus was first established in 1907 by Australian ichthyologist James Douglas Ogilby, who designated *Rhycherus wildii* as the type species, with a type locality of South Australia. That species is now considered a junior synonym of *Chironectes filamentosus*, originally described by François-Louis Laporte, comte de Castelnau in 1872 from St Vincent Gulf, South Australia. Taxonomic opinions vary: some place *Rhycherus* in the subfamily Histiophryninae within Antennariidae, while others put it in the monotypic family Rhycheridae. The 5th edition of *Fishes of the World* does not recognize subfamilies within Antennariidae, instead grouping the family—including this genus—in the suborder Antennarioidei and the order Lophiiformes, the anglerfishes.
The name *Rhycherus* comes from the Greek word for “ragged,” a reference to the shaggy appearance of *R. filamentosus*.
Two recognized species belong to the genus: *Rhycherus filamentosus* (the tasselled anglerfish) and *Rhycherus gloveri* (Glover’s anglerfish).
In these anglerfishes, the second and third dorsal spines are not hidden beneath the skin. All rays in the caudal fin are forked. The skin is smooth, lacking dermal denticles, but is covered with many closely set cutaneous appendages. The third dorsal spine is mostly free, with only its basal quarter to third connected to the nape by a membrane. The largest species, *R. filamentosus*, reaches a maximum total length of 23 cm (9.1 in).
Both species are endemic to Australia. *R. filamentosus* occurs in southeastern waters, while *R. gloveri* is found in the southwest. They inhabit algal-covered rocky reefs down to depths of about 150 m (490 ft).
These fish are oviparous. Females lay large eggs, each attached to a rock surface by a long filament. The male guards the eggs with his body until they hatch. Like other anglerfishes, they are ambush predators, using their illicium (or esca) to lure prey.
- First described as genus
- 1907
- Described by
- James Douglas Ogilby
- Type species
- Rhycherus wildii
- Number of species
- 2
- Largest species max length cm
- 23
- Depth range m
- 150
Lore & Background
Rhycherus was first proposed as a monospecific genus in 1907 by the Australian ichthyologist James Douglas Ogilby when he described Rhycherus wildii. R. wildii had its type locality given as South Australia, this taxon is now considered to be a junior synonym of Chironectes filamentosus, originally described by François-Louis Laporte, comte de Castelnau in 1872 from St Vincent Gulf in South Australia. Some authorities classify this genus in the subfamily Histiophryninae within the family Antennariidae, while others place it in the monotypic family Rhycheridae. However, the 5th edition of Fishes of the World does not recognise subfamilies within the Antennariidae, instead classifying the family, including this genus, within the suborder Antennarioidei and the order Lophiiformes, the anglerfishes.
Rhycherus anglerfishes' second and third dorsal spines are not hidden underneath their skin. All of the fin rays in their caudal fin are forked. They have smooth skin with many closely set cutaneous appendages instead of dermal denticles. Their third dorsal spine is mostly free, with only the basal quarter to third connected to the nape by a membrane. The largest species in the genus is R. filamentosus, which has a maximum published total length of 23 cm. Rhycherus anglerfishes are endemic to Australia. R. filamentosus is found in southeastern Australia while R. gloveri is found in southwestern Australia. Both species occur on algal-covered rocky reefs at depths down to around 150 m.
Reader's Guide
Rhycherus holds significance as a genus of frogfishes endemic to Australian waters, with its classification reflecting ongoing taxonomic debate. Some authorities place it in the subfamily Histiophryninae within Antennariidae, while others elevate it to the monotypic family Rhycheridae, known as the Balrog frogfishes. The 5th edition of Fishes of the World does not recognize subfamilies within Antennariidae, instead placing the family in the suborder Antennarioidei and order Lophiiformes. The genus currently contains two recognized species: Rhycherus filamentosus (Tasselled anglerfish) and Rhycherus gloveri (Glover's anglerfish). Its etymology, from Greek meaning 'ragged', alludes to the shaggy appearance of R. filamentosus. The genus is notable for its reproductive biology: females lay large eggs, each adhered to a rock surface by a long filament, and the male guards the eggs with his body until the offspring emerge. Like other anglerfish, these are ambush predators that lure prey with their illicium or esca. The species inhabit algal-covered rocky reefs at depths to about 150 m, with R. filamentosus in southeastern Australia and R. gloveri in southwestern Australia.
Did You Know?
- Rhycherus means 'ragged' in Greek, referring to the shaggy appearance of R. filamentosus.
- The genus was first proposed in 1907 by Australian ichthyologist James Douglas Ogilby.
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