| Petrotyx | |
|---|---|
 | |
| Petrotyx sanguineus | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Ophidiiformes |
| Family: | Ophidiidae |
| Subfamily: | Neobythitinae |
| Genus: | Petrotyx Heller & Snodgrass, 1903 |
| Type species | |
| Petrotyx hopkinsi Heller & Snodgrass, 1903 [1] | |
There are currently two recognized species in this genus: [2]
Dinematichthys is a genus of viviparous brotulas. Its name comes from Greek, meaning two-filamented fish.
The cusk-eel family, Ophidiidae, is a group of marine boney fishes in the order Ophidiiformes. The scientific name is from the Greek ophis meaning "snake", and refers to their eel-like appearance. True eels, however, diverged from other ray-finned fish during the Jurassic, while cusk-eels are part of the Percomorpha clade, along with tuna, perch, seahorses, and others. Unlike true eels of the order Anguilliformes, cusk-eels have ventral fins that are developed into a forked barbel-like organ below the mouth. In the true eels by contrast, the ventral fins are never well-developed and usually missing entirely.
The viviparous brotulas form a family, the Bythitidae, of ophidiiform fishes. They are known as viviparous brotulas as they generally bear live young, although there are indications that some species do not. They are generally infrequently seen, somewhat tadpole-like in overall shape and mostly about 5–10 cm (2–4 in) in length, but some species grow far larger and may surpass 60 cm (2 ft).
The Fiordland brotula, Fiordichthys slartibartfasti, is a rare viviparous brotula found only in the Fiordland region of the South Island of New Zealand. It is inhabits spaces in rock rubble and is found at depths of from 10 to 12 metres. This species grows to a length of 11.1 centimetres (4.4 in) SL.
Fiordichthys is a genus of viviparous brotula native to the southwest Pacific Ocean.
Saccogaster is a genus of viviparous brotulas. They are found in the western Atlantic and Indo-Pacific.
Bellottia is a genus of viviparous brotulas which is found in the subtropical waters of the North Atlantic, the Mediterranean Sea and the Indo-Pacific.
Bidenichthys is a genus of viviparous brotulas.
The Red brotula is a species of viviparous brotula found along the North American Pacific coast from Alaska to Baja California. This fish is often displayed in public aquariums. This species grows to a length of 46 centimetres (18 in) TL. The red brotula is the only known member of its genus.
The Taiwan coral-brotula is a species of viviparous brotula, the only known member of its genus, found mostly in the surge zone of the waters around Taiwan and the Philippines where it lives amongst rocks. This species grows to a length of 6 centimetres (2.4 in) SL.
Bythites is a genus of viviparous brotulas found in the Atlantic Ocean.
Calamopteryx is a genus of viviparous brotulas.
Cataetyx is a genus of viviparous brotulas.
Dermatopsoides is a genus of viviparous brotulas.
Grammonus is a genus of viviparous brotula.
Gunterichthys is a genus of viviparous brotula.
Hephthocara is a small genus of Indo-Pacific viviparous brotula.
Paradiancistrus is a genus of viviparous brotulas.
Brotula is a genus of cusk-eels. It is the only genus is the subfamily Brotulinae.
Bythitinae is a subfamily of viviparous brotulas, one of the two subfamilies in the family Bythitidae. This subfamily is characterised by having the dorsal, caudal and anal fins combined. They are mostly found in temperate to tropical seas, from reefs to the benthopelagic zone, but some species from the North Atlantic Ocean occur in into Arctic waters.
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