Heterotidinae

Heterotidinae (lat.) - a subfamily of freshwater ray-finned fish from the Aravanian family of the Aravanidae order ^[2] .

Heterotidinae
Nile heterotis ( Heterotis niloticus )
Scientific classification
Domain: Eukaryotes Kingdom: Animals Kingdom : Eumetazoi No rank : Bilateral symmetrical No rank : Secondary Type of: Chordate Subtype : Vertebrates Infratype : Maxillary Group : Fish Group : Bone fish Grade: Rayfin fish Subclass : Freshfishes Infraclass : Bony fish Suprahort : Teleocephala Cohort : Osteoglossomorphs Squad: Araranoid Suborder : Aravanoid Family: Aravanic Subfamily : Heterotidinae
International scientific name
Heterotidinae Nelson , 1968
Synonyms
Geterotidae Heterotinae Lim , 1996 Arapaimidae Arapaimatidae Ferraris , 2003 [1]
Geochronology 70.6 million years appeared million years Period Era Aeon 2,588 Even Ka F but n e R about s about th 23.03 Neogene 66.0 Paleogen 145.5 a piece of chalk M e s about s about th 199.6 Yura 251 Triassic 299 Permian P but l e about s about th 359.2 Carbon 416 Devonian 443.7 Silur 488.3 Ordovician 542 Cambrian 4570 Precambrian ◄ Nowadays ◄ Cretaceous-Paleogene extinction ◄ Triassic extinction ◄ Mass Permian Extinction ◄ Devonian extinction ◄ Ordovician-Silurian extinction ◄ Cambrian explosion

There are only 2 modern species in the subfamily - arapaima ( Arapaima gigas ), which is widespread in the Amazon basin , and heterotis ( Heterotis niloticus ), which lives in reservoirs of western Africa . Giant arapaima is the largest freshwater fish in South America and one of the largest freshwater bony fish in the world; its largest specimens reach a length of at least 390 cm (according to unconfirmed reports more than 450 cm) ^[1] . Heterotidinae lacks a mandibular antennae, and the rays of the gill membrane 10–11 ( Arapaima ) or 7–9 ( Heterotis ) ^[2] .