The holotype is a fragmentary specimen with a C. masoni like structure.

Two new dinosaurian reptiles from Mongolia with notes on some fragmentary specimens.

Most eosimiid species are documented by unique or fragmentary specimens.

To date it is only known from fragmentary specimens.

Other fragmentary European alvarezsaurid specimens have since been reported.

Meanwhile, though Dimorphodon is not a very common fossil, other fragmentary specimens were found.

At present, about 245 fragmentary specimens are known, representing numerous individuals.

It is known only from an extremely fragmentary specimen, measuring 70 cm (2.3 ft) long.

Brontomerus is known from two fragmentary specimens differing in size, likely a juvenile and an adult.

A fragmentary third specimen was identified in 2007 as belonging to C. placidoi.