Eretmosaurus rugosus The holotype of
E. rugosus has no known recorded specimen number and it consists of vertebrae, girdles, and limb bones discovered in
Granby,
Nottinghamshire where the
Asteroceras obtusum zone of the
Lower Lias Formation outcrops. Later, Owen (1865) described a headless skeleton discovered in the Ammonites stellaris zone of the
Blue Lias at Granby, Nottinghamshire (
NHMUK 14435) that he assigned to
P. rugosus, and Seeley used
NHMUK 14435 as the basis for naming
Eretmosaurus rugosus in 1874. As
BRSMB Cb 2458 was not diagnostic and was lost by 1940, a petition was filed with the
ICZN over the holotype by Brown and Bardet (1994), and NHMUK 14435 was allocated as the official neotype in 1996. A fragmentary specimen of
Eretmosaurus rugosus has also been identified from the
Middle Jurassic of
Siberia by Menner (1992).
Other species Benton and Spencer (1995) mentioned a third species of
Eretmosaurus:
E. macropterus; they rectified this mistake within the same paper by mentioning on page 116 that
E. macropterus actually belongs to
Microcleidus. ==Classification==