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Siamosaurus 's role as a partially piscivorous predator may have reduced the prominence of some contemporaneous crocodilians competing for the same food sources. Isotope analysis of the teeth of Siamosaurus and other spinosaurids indicates semiaquatic habits.
Siamosaurus: 1986 Khok Kruat Formation, Sao Khua Formation (Early Cretaceous, Barremian to Aptian) Thailand: Only known from teeth. Some spinosaurid postcrania from the same area may be referrable to this genus [127] Siamotyrannus: 1996 Sao Khua Formation (Early Cretaceous, Berriasian to Barremian) Thailand
The teeth of spinosaurids were conical, with an oval to circular cross section and either absent or very fine serrations. Their teeth ranged from slightly recurved, such as those of Baryonyx and Suchomimus, to straight, such as those of Spinosaurus and Siamosaurus, and the crown was often ornamented with longitudinal grooves or ridges. [35] [38]
The Khok Kruat Formation has yielded remains of sharks, fishes, turtles, crocodilians and pterosaurs. Phuwiangosaurus-like teeth, Siamosaurus teeth, and fragmentary postcranial remains of spinosaurids have also been recovered from it. [3]
The Sao Khua Formation (Thai: หมวดหินเสาขัว) is a middle member of the Khorat Group.It consists of an alteration of pale red to yellowish-gray, fine to medium-grained sandstone and grayish-reddish brown siltstone and clay.
Ostafrikasaurus teeth in contrast bore strong lengthwise ridges, a feature also seen in Baryonyx and its close relatives, though their prominence varies between taxa. Spinosaurus teeth, like those of typical theropods, were usually smooth, and Asian forms like Siamosaurus exhibited an increase in the
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Like Siamosaurus, this African genus – This refers to S. aegyptiacus, which is a species not a genus. Changed to "taxon". PσlєοGєєк ƧɊƲΔƦΣƉ 09:52, 28 June 2020 (UTC) that since crocodilian teeth are usually more strongly recurved than spinosaur teeth, they cannot represent the same taxon – I can't follow, which taxon?