- Spinosaurus aegyptiacus Stromer, 1915 -- "the Egyptian spine [thorn] lizard."
Stromer (1915) described Spinosaurus on the basis of an incomplete specimen including a lower jaw, part of the maxilla, several vertebrae, and a pubic bone. The animal may have reached a total of 45 feet in length, and may have had a skull over 5 feet long, completing the mandible. The jaw is deep, so I've reconstructed the skull to accomodate this shape, considering the shape of the skull compared to the jaw in other spinosaurs (like Baryonyx and Suchomimus) and it does fairly complement the shape of the skull in Torvosaurus (see Britt, 1991).
- S. moroccanus Russell, 1996 -- "the Moroccan spine [thorn] lizard."
Russell (1996) described vertebrae similar to that of S. aegyptiacus, and gave them a new name, belonging to a smaller (estimated 30 feet long) individual than S. aegyptiacus. These vertebrae can be applied to a younger individual of S. aegyptiacus, following Sereno et al. (1998), so this taxon is probably a subjective junior synonym; however, Sereno et al. (1998) has not sufficiently compared the two taxa, so this arrangement must stand until a published comparison. Taquet and Russell (1998), in describing Cristatusaurus, refered a large upper jaw to S. moroccanus (MNHN SAM 124: partial premaxillae, maxillae, and vomers), but this fragment of jaw measures nearly 2 feet, and compared to Suchomimus and Baryonx (and Irritator with Angaturama's snout) would have been part of a skull about 7 feet long, which is unlikely to apply to a 30 foot long animal. It does, however, compare easily with an animal the size of S. aegyptiacus, and upon reconstructing the back of the skull as compared to snout length and height, the skulls would be relatively equal in height, but the MNHN SAM specimen is much longer.
- Baryonyx walkeri Charig and Milner, 1986 -- "Walker's heavy claw."
Charig and Milner (1986; and subsequently in 1990 and 1997) described the skull and postcrania of the most complete and largest theropod specimen from England, the second being Eustreptospondylus; the skull lacks the central area, so the exact length has to be made from comparisons with the only other fairly complete spinosaur skull reconstruction, that of Suchomimus (Sereno et al., 1998).
- Irritator challengeri Martill et al., 1996 -- "Challenger's irritator."
- Angaturama limai Kellner and Campos, 1996 -- "Lima's noble one."
- Cristatusaurus lapparenti Taquet and Russell, 1998 -- "Lapparent's crested lizard."
- Suchomimus tenerensis Sereno et al., 1999 -- "The crocodile immitator from the Ténéré."
Spinosaur head studies. Clockwise from bottom left: Suchomimus tenerensis,
Spinosaurus aegyptiacus, "Spinosaurus" moroccanus [possibly n. gen.],
Baryonyx walkeri, and Irritator challengeri with Angaturama limai
snout added. Discussion of restoration above.