Trinacromerum

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Trinacromerum
Temporal range: Late Cretaceous
Trinacromerum ROM Dec29 07.png
Trinacromerum at Royal Ontario Museum
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Order: Plesiosauria
Suborder: Plesiosauroidea
Family: Polycotylidae
Genus: Trinacromerum

Trinacromerum is an extinct genus of sauropterygian reptile belonging to the plesiosaur suborder. It lived during the Late Cretaceous period in what is now Kansas.

Description[edit]

Trinacromerum with a human to scale.

It was 3 meters (9.8 feet) long. Its teeth show it fed on small fish.

The long flippers of Trinacromerum enabled it to achieve high swimming speeds.[1] Its physical appearance was described by Richard Ellis as akin to a "four-flippered penguin."[2]

Classification[edit]

Profile view of Trinacromerum
Trinacromerum bentonianum from the Late Cretaceous of Kansas

Below is a cladogram of polycotylid relationships from Ketchum & Benson, 2011.[3]

Plesiosauroidea 

Cryptoclididae


 Leptocleidia 

Leptocleididae


 Polycotylidae 

Edgarosaurus





Plesiopleurodon



QM F18041






Eopolycotylus



Polycotylus



Thililua





Trinacromerum




Manemergus




"D. herschelensis"




Dolichorhynchops



Palmulasaurus











References[edit]

  1. ^ Ellis, Richard (2003). Sea Dragons: Predators of the Prehistoric Oceans. University Press of Kansas. p. 189. ISBN 0-7006-1269-6. 
  2. ^ Ellis, 190
  3. ^ Hilary F. Ketchum and Roger B. J. Benson (2011). "A new pliosaurid (Sauropterygia, Plesiosauria) from the Oxford Clay Formation (Middle Jurassic, Callovian) of England: evidence for a gracile, longirostrine grade of Early-Middle Jurassic pliosaurids". Special Papers in Palaeontology 86: 109–129. doi:10.1111/j.1475-4983.2011.01083.x. 

External links[edit]