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Saltopus

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Saltopus

Saltopus ("hopping foot") is a genus of small bipedal dinosauriforms containing the single species S. elginensis from the late Triassic period of Scotland.

Description

Saltopus elginensis is known only from a single partial skeleton lacking the skull but including parts of the vertebral column, the forelimbs, the pelvis and the hindlimbs. These have been mainly preserved as impressions or natural casts in the sandstone; very little bone material is present. It was about the size of a domestic cat, and would have been roughly 80–100 centimetres (31–39 in) long. It had hollow bones like those of birds and other dinosaurs. It may have weighed around 1 kilogram (2.2 lb). Most of the length was accounted for by the tail. It had five-fingered hands, with the fourth and fifth finger reduced in size. Contrary to the original description, in 2011 it was established that the sacrum (hip vertebrae) as made up of two vertebrae, the primitive ancestral condition, not four.

Classification

Saltopus has been variously identified as a saurischian (lizard-hipped) dinosaur, a more advanced theropod, and a close relative of the herrerasaurs, but its taxonomy has been in dispute because only fragmentary remains have been recovered. Some researchers, such as Gregory S. Paul, have suggested it may represent a juvenile specimen of a coelophysid theropod such as Coelophysis or Procompsognathus. Rauhut and Hungerbühler in 2000 concluded it is a primitive dinosauriform, not a true dinosaur, closely related to Lagosuchus.[4] Michael Benton, continuing the studies of the late Alick Walker redescribing the fossil, in 2011 found it to be a dinosauriform more derived than Pseudolagosuchus and outside the smallest clade including Silesauridae and Dinosauria.

The Land Before Time

A Saltopus is briefly seen in The Land Before Time perching on a rock before being scared off by a Hopper.

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