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Eoplesiosaurus: an early plesiosaur, of course

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Very little to say about this recent addition
to the large reptile tree (LRT, 2338 taxa). It has no special traits because it is transitional from one grade to another. Benson, Evans and Druckenmiller 2012 described this specimen.  Meet Eoplesiosaurus (Fig 1).

Eoplesiosaurus antiquior (Benson, Evans and Druckmiller 2012, Earliest Jurassic, TTNCM 8348; 199mya) is known from a complete articulated skeleton lacking a skull. It is one of the earliest plesiosauroids. In the LRT Eoplesiosaurus is a sister to Plesiosaurus (above) nesting at the base of the rest of the elasmosaurids. The few differences that can be scored in the LRT from Plesiosaurus are found in the metapodials and digits of the flippers. ” data-image-caption=”

Figure 1. Eoplesiosaurus in situ, as originally diagrammed and with DGS colors added here.

” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/04/eoplesiosaurus_antiquior588.gif?w=87″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/04/eoplesiosaurus_antiquior588.gif?w=298″ class=”size-full wp-image-92524″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/04/eoplesiosaurus_antiquior588.gif” alt=”Eoplesiosaurus antiquior (Benson, Evans and Druckmiller 2012, Earliest Jurassic, TTNCM 8348; 199mya) is known from a complete articulated skeleton lacking a skull. It is one of the earliest plesiosauroids. In the LRT Eoplesiosaurus is a sister to Plesiosaurus (above) nesting at the base of the rest of the elasmosaurids. The few differences that can be scored in the LRT from Plesiosaurus are found in the metapodials and digits of the flippers. ” width=”584″ height=”2004″ srcset=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/04/eoplesiosaurus_antiquior588.gif?w=584&h=2004 584w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/04/eoplesiosaurus_antiquior588.gif?w=44&h=150 44w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/04/eoplesiosaurus_antiquior588.gif?w=87&h=300 87w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/04/eoplesiosaurus_antiquior588.gif 588w” sizes=”(max-width: 584px) 100vw, 584px” />

Figure 1. Eoplesiosaurus in situ, as originally diagrammed and with DGS colors added here.

Eoplesiosaurus antiquior
(Benson, Evans and Druckmiller 2012, Earliest Jurassic, TTNCM 8348; 199mya) is known from a complete articulated skeleton lacking a skull. It is one of the earliest plesiosauroids. In the LRT Eoplesiosaurus is a sister to Plesiosaurus nesting at the base of the rest of the elasmosaurids. The few differences that can be scored in the LRT from Plesiosaurus are found in the metapodials and digits of the flippers.

References
Benson RBJ, Evans M and Druckenmiller PS 2012. High Diversity, Low Disparity and Small Body Size in Plesiosaurs (Reptilia, Sauropterygia) from the Triassic–Jurassic Boundary. PLOS ONE. 7 (3): e31838.

wiki/Plesiosaurus
wiki/Eoplesiosaurus

The following news item
spurred this research and this taxon addition.

wiki/Plesiopterys

Jurassic Sea Monster Resurfaces: Rare Fossil Unveils Secrets of Plesiosaur Evolution


Source: https://pterosaurheresies.wordpress.com/2025/04/20/eoplesiosaurus-an-early-plesiosaur-of-course/


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