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Extinct genus of bony fishes
Megamastax (meaning "big mouth") is a genus of stem bony fish which lived during the late Silurian period, about 423 million years ago, in China. Before
Megamastax
Diverse clade of vertebrate animals
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Osteichthyes
Clade of lobe-finned fish
2006 †Psarolepis romeri Yu 1998 sensu Zhu, Yu, Wang, Zhao & Jia, 2006 †Megamastax ambylodus Choo, Zhu, Zhao, Jia, & Zhu, 2014 †Sparalepis tingi Choo, Zhu
Sarcopterygii
Clade of vertebrates
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Rhipidistia
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Sparalepis
Extinct genus of basal bony fish
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Eosteus
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Andreolepis
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Psarolepis
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Onychodus
Placoderm fish from the late Ludlow epoch of the Silurian period
Formation including Sparalepis tingi (foreground), numerous conodonts, and Megamastax (background) Video of 3D reconstruction Bianchengichthys Qilinyu Silurolepis
Entelognathus
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Glyptolepis_(fish)
Extinct species of bony fish
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Guiyu_oneiros
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Lophosteus
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Holoptychius
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Achoania
(2026). Lu et al. (2026) report the discovery of new fossil material of Megamastax amblyodus providing new information on its anatomy, compare it with fossil
2026_in_paleoichthyology
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Laccognathus
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Osteoplax
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Naxilepis
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Dialipina
Extinct genus of osteichthyans
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Ligulalepis
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Qingmenodus
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Amazinyomakhulu
Extinct genus of lobe finned fish
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Strunius
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Quebecius
Extinct order of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Porolepiformes
Extinct order of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Onychodontiformes
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Porolepis
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Grossius
Evolution of fish
thrown back and, in arthrodires, allowed them to take larger bites. Megamastax Megamastax, (big mouth), is a genus of lobe-finned fish which lived during
Timeline_of_fish_evolution
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Powichthys
Karaman Basin Turkey A viviparous brotula, a species of Mascarenichthys. Megamastax Gen. et sp. nov Valid Choo et al. Silurian (Ludfordian, ~423 mya) Kuanti
2014_in_paleoichthyology
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Orvikuina
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Bukkanodus
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Luckeus
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Ventalepis
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Arquatichthys
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Heimenia
Extinct genus of bony fishes
†Entelognathus? †Eosteus †Guiyu †Janusiscus? †Ligulalepis †Lophosteus †Meemannia †Megamastax †Naxilepis †Orvikuina †Psarolepis †Ramirosuarezia? †Sparalepis †Terenolepis
Duffichthys
MEGAMASTAX
MEGAMASTAX
MEGAMASTAX
MEGAMASTAX
Boy/Male
Arabic, Muslim
Prize; Reward
Boy/Male
Portuguese Spanish American
Rosary. Refers to devotional prayers honoring Mary.
Surname or Lastname
English
English : habitational name from Holtby, a place near York, probably named with the Old Norse personal name Holti + býr ‘farmstead’, ‘settlement’.
Girl/Female
Gujarati, Hindu, Indian
Flower
Girl/Female
Hindu, Indian
Beauty
Boy/Male
Indian
Stopper
Boy/Male
Australian, Danish, German, Swedish
Brave with the Spear; Spear Rule
Girl/Female
American, Anglo, Australian, British, Christian, English
Maiden; Young Woman
Boy/Male
Tamil
Lord Shiva
Surname or Lastname
English
English : variant spelling of Stanbrough.
MEGAMASTAX
MEGAMASTAX
MEGAMASTAX
MEGAMASTAX
MEGAMASTAX