| Goanna fish | |
|---|---|
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| Drawing by Dr Tony Ayling | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Notacanthiformes |
| Family: | Halosauridae |
| Genus: | Halosaurus |
| Species: | H. pectoralis |
| Binomial name | |
| Halosaurus pectoralis McCulloch, 1926 | |
The goanna fish, Australian halosaur, or common halosaur, Halosaurus pectoralis, is a halosaur of the genus Halosaurus , found in the south west Pacific Ocean.
Neopterygii is a subclass of ray-finned fish (Actinopterygii). Only a few changes occurred during the evolution of neopterygians from the earlier actinopterygians. They appeared sometime in the Late Permian, before the time of the dinosaurs. The neopterygians were a very successful group of fish, because they could move more rapidly than their ancestors. Their scales and skeletons began to lighten during their evolution, and their jaws became more powerful and efficient. While electroreception and the ampullae of Lorenzini are present in all other groups of fish, with the exception of hagfish, neopterygians have lost this sense, even if it has later been re-evolved within Gymnotiformes and catfishes, which possess nonhomologous teleost ampullae.
Halosaurs are eel-shaped fishes found only at great ocean depths. As the family Halosauridae, halosaurs are one of two families within the order Notacanthiformes; the other being the deep-sea spiny eels, Notacanthidae. Halosaurs are thought to have a worldwide distribution, with some 17 species in three genera represented. Only a handful of specimens have been observed alive, all in chance encounters with Remotely operated underwater vehicles.
The roosterfish, Nematistius pectoralis, is a game fish found in the warmer waters of the East Pacific from Baja California to Peru. It is the only species in the genus Nematistius and the family Nematistiidae. It is distinguished by its "rooster comb", seven very long spines of the dorsal fin.
The Alaska blackfish is a species of freshwater fish in the esocid family (Esocidae) of order Esociformes. It inhabits Arctic regions of Alaska as well as Siberia and the Bering Sea islands.
The New Zealand black angelfish or the black scalyfin, Parma alboscapularis, is a damselfish of the family Pomacentridae, found around northeastern New Zealand to depths of a few metres, over shallow rocky reef areas. Its length is between 24 and 28 cm.
The New Zealand rockfish, Acanthoclinus littoreus, is a roundhead of the genus Acanthoclinus, found only in New Zealand from shallow depths to 15 m. Their length is between 5 and 15 cm.
The notchheaded marblefish, Aplodactylus etheridgii, is a marblefish of the genus Aplodactylus, found between North Cape and East Cape in the North Island of New Zealand, in depths down to 40 m. Their lengths are between 35 and 40 cm.
Bruun's cutthroat eel, Histiobranchus bruuni, is a cutthroat eel of the genus Histiobranchus, found around New Zealand at the bottom of the deep ocean basin at depths of between 4,000 and 5,000 m. Their length is between 40 and 60 cm.
The alert pigfish, Alertichthys blacki, is a pigfish, the only species in the genus Alertichthys, found around New Zealand at depths between 100 and 600 m. It is between 15 and 20 cm in length.
A goanna is any of several Australian monitor lizards of the genus Varanus.
The New Zealand sole or common sole, Peltorhamphus novaezeelandiae, is a righteye flounder of the genus Peltorhamphus, found around New Zealand in shallow enclosed waters less than 100 m in depth. Their length is from 25 to 45 cm.
The longnose spurdog is a dogfish shark of the genus Squalus, found over continental shelves in all oceans, at depths of between 15 and 800 metres. They reach one metre in length.
Helicolenus percoides, the red gurnard perch or jock stewart, is a rockfish of the family Sebastidae, found on the continental shelves of Australia and New Zealand at depths of between 20 and 750 m. Its length is up to 47 cm. Also called ocean perch, coral cod, coral perch, reef ocean perch, red perch, red rock perch, red gurnard scorpionfish, and sea perch.
The giant stargazer, Kathetostoma giganteum, is a stargazer of the family Uranoscopidae, found on the continental shelf around New Zealand and endemic to that area.
The New Zealand flathead, Bembrops morelandi, is a duckbill fish of the family Percophidae, subfamily Bembropinae, found only around New Zealand, at depths between 365 and 395 m. Their length is up to 20 cm.
The snakeskin gourami is a species of gourami native to Southeast Asia.
Halosaurus is a genus of fish in the family Halosauridae. This genus currently contains the following recognized species:
Halosaurus johnsonianus, also called the Sahara halosaur, is a deep-sea fish in the family Halosauridae. It is found in the eastern Atlantic Ocean from southern Spain and Portugal to Mauritania, including the Azores and Canary Islands. It is a benthopelagic species living on the continental slope in depths from 800 to 2,200 m. It grows to 50 cm (20 in) total length.
Halosaurus radiatus, also known as the Albatross halosaur, is a fish in the family Halosauridae.
Halosaurus ovenii, also called the Oven's halosaur, is a deep-sea fish in the family Halosauridae. It is found in the eastern Atlantic where it is widely distributed in tropical and subtropical waters along both coasts. In the Mediterranean, H. ovenii is considered rare. It can reach up to 60 cm in length.
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