Crassigyrinus
Crassigyrinus (meaning "thick tadpole") is an extinct genus of carnivorous stem tetrapod from the Early Carboniferous Limestone Coal Group of Scotland and possibly Greer, West Virginia. The type specimen was originally described as "Macromerium scoticum" and lacked a complete skull. With subsequent discoveries, "Crassigyrinus" is now known from three skulls, one of which is in articulation with a fairly complete skeleton, and two incomplete lower jaws. "Crassigyrinus" grew up to 2 meters in length, coupled with tiny limbs and unusually large jaws. "Crassigyrinus" is taxonomically enigmatic, having confused paleontologists for decades with its apparent fish-like and tetrapod features. It was traditionally placed within the group Labyrinthodontia along with many other early tetrapods. Some paleontologists have even considered it as the most basal crown group tetrapod, while others hesitate to even place it within the Tetrapoda superclass. "Crassigyrinus" had unusually large jaws, enabling it to eat other animals it could catch and swallow. It had two rows of sharp teeth in its jaws, the second row having a pair of fangs. "Crassigyrinus" had large eyes, suggesting that it was either nocturnal, or lived in very murky water.
Q123509
extinct
Concept
Q34740
genus
Concept
Q81875
carnivorous
Concept
Q7607287
stem tetrapod
UNK
Q744718
Early Carboniferous
LOC
None
Limestone Coal Group
UNK
Q22
Scotland
LOC
Q5605126
Greer, West Virginia
LOC
Q13147
skull
Concept
Q7205
paleontologist
Concept
Q152
fish
Concept
Q753235
Labyrinthodontia
Concept
Q379061
basal
UNK
Q1462809
crown group
Concept
Q37517
superclass
Concept
Q553
teeth
Concept
Q134235
Crassigyrinus
Concept
Q134235
Crassigyrinus
Concept
Q134235
Crassigyrinus
Concept
Q134235
Crassigyrinus
Concept
Q134235
Crassigyrinus
Concept
Q134235
Crassigyrinus
Concept
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2
NUMBER
taxon rank