The beak-headed or trunk-headed [2] [3] ( Latin Rhynchocephalia ) is one of the four modern groups of reptiles. Representatives of the squad have a number of archaic features, in particular, a developed parietal eye . Modern representatives are the Tatters inhabiting the islands of New Zealand . Until recently, two species of living-life gatter were distinguished ( Sphenodon punctatus and Sphenodon guntheri ), but in recent years their independence has been questioned [4] .
| Beakhead |
Gatteria ( Sphenodon ) |
| Scientific classification |
|---|
| No rank : | Bilateral symmetric |
| Infraclass : | Lepidozavromorfy |
|
| International Scientific Name |
|---|
Rhynchocephalia Günther , 1867 [1] |
| Area |
|---|
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Currently, 43 minerals and 2 modern species are included in the order, which unite three families [5] . Most species are described as part of monotypic genus [5] :
- † Gephyrosauridae ( paraphyletic group [5] )
- † Gephyrosaurus
- † Diphydontosaurus
- † Planocephalosaurus
- † Pleurosauri (Pleurosauridae)
- † Palaeopleurosaurus
- † Pleurosaurus - 2 species
- Splint tooth (Sphenodontidae)
- † Rebbanasaurus
- † Polysphenodon
- † Brachyrhinodon
- † Clevosaurus - 7 species
- † Homoeosaurus - 3 species
- † Kaikaifilusaurus
- † Kallimodon - 2 species
- † sapheosaurus
- † Ankylosphenodon
- † Pamizinsaurus
- † Zapatadon
- † Theretairus
- † Sphenovipera
- † Cynosphenodon
- Sphenodon - Sphenodons , 3 species
- † Opisthias
- † Toxolophosaurus
- † Priosphenodon
- † Eilenodon
- childbirth incertae sedis
- † derasmosaurus
- † Elachistosuchus
- † Godavarisaurus
- † Kawasphenodon
- † Lamarquesaurus
- † Leptosaurus
- † Pelecymela
- † Piocormus
- † Sigmala
- † tingitana
Individual representatives
- † Priosphenodon avelasi is an extinct species of beakheads that lived in Argentina about 95 million years ago. It was described in 2003 on the basis of a partial skeleton of an adult individual [6] .
