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First evidence of denticulated dentition in teleosaurid crocodylomorphs

First evidence of denticulated dentition in teleosaurid crocodylomorphs
First evidence of denticulated dentition in teleosaurid crocodylomorphs
Teleosauridae was a group of largely marine Mesozoic crocodylomorphs, typically considered as akin to “marine gavials” due to their elongate, tubular, polydont rostra that are indicative of a piscivorous diet. Here we show that these extinct crocodylomorphs were more anatomically, and perhaps ecologically, varied than previously thought. We report the first evidence of denticles in a teleosaurid tooth, revealed by scanning electron microscopic (SEM) analysis of a tooth from the holotype of “Steneosaurus” obtusidens. These denticles are cryptic, because they are microscopic, not contiguous along the carinae (instead forming short series), and are detectable only using SEM. This incipient denticle morphology is similar to that recently discovered in a closely related group of marine crocodylomorphs, the Metriorhynchidae. In particular, the denticulation morphology of “Steneosaurus” is similar to that of the geosaurin metriorhynchid Torvoneustes, indicating that these two taxa may have employed similar feeding styles and that “S.”obtusidens may have been a nearshore ecological analogue to the more offshore, fast-swimming geosaurins. Previous authors have considered “S.” obtusidens and Machimosaurus to be durophagous, but the discovery of denticulated teeth indicates that they had a more varied diet and feeding style, and included flesh slicing as part of their feeding toolkit. It is currently unknown how extensive denticulate carinae may be in Teleosauridae, and we hypothesise that cryptic denticles may also be present in other marine crocodylomorphs once they are subjected to SEM study.
Thalattosuchia, Teleosauridae, Steneosaurus, denticles, durophagy, functional ecology, Mesozoic, United Kingdom
0567-7920
661-671
Young, Mark T.
d9880973-1dd1-4b1c-81a8-7494170dbac2
Beatty, Brian
00d4580c-4edd-44f2-8559-5fff1ace976c
Brusatte, Stephen
1d1dea61-d77c-4a6e-bb84-86a76352ca24
Steel, Lorna
661f272f-fa0c-45bb-89a3-3036cc85c703
Young, Mark T.
d9880973-1dd1-4b1c-81a8-7494170dbac2
Beatty, Brian
00d4580c-4edd-44f2-8559-5fff1ace976c
Brusatte, Stephen
1d1dea61-d77c-4a6e-bb84-86a76352ca24
Steel, Lorna
661f272f-fa0c-45bb-89a3-3036cc85c703

Young, Mark T., Beatty, Brian, Brusatte, Stephen and Steel, Lorna (2015) First evidence of denticulated dentition in teleosaurid crocodylomorphs. Acta Palaeontologica Polonica, 60 (3), 661-671. (doi:10.4202/app.00002.2013).

Record type: Article

Abstract

Teleosauridae was a group of largely marine Mesozoic crocodylomorphs, typically considered as akin to “marine gavials” due to their elongate, tubular, polydont rostra that are indicative of a piscivorous diet. Here we show that these extinct crocodylomorphs were more anatomically, and perhaps ecologically, varied than previously thought. We report the first evidence of denticles in a teleosaurid tooth, revealed by scanning electron microscopic (SEM) analysis of a tooth from the holotype of “Steneosaurus” obtusidens. These denticles are cryptic, because they are microscopic, not contiguous along the carinae (instead forming short series), and are detectable only using SEM. This incipient denticle morphology is similar to that recently discovered in a closely related group of marine crocodylomorphs, the Metriorhynchidae. In particular, the denticulation morphology of “Steneosaurus” is similar to that of the geosaurin metriorhynchid Torvoneustes, indicating that these two taxa may have employed similar feeding styles and that “S.”obtusidens may have been a nearshore ecological analogue to the more offshore, fast-swimming geosaurins. Previous authors have considered “S.” obtusidens and Machimosaurus to be durophagous, but the discovery of denticulated teeth indicates that they had a more varied diet and feeding style, and included flesh slicing as part of their feeding toolkit. It is currently unknown how extensive denticulate carinae may be in Teleosauridae, and we hypothesise that cryptic denticles may also be present in other marine crocodylomorphs once they are subjected to SEM study.

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Published date: August 2015
Keywords: Thalattosuchia, Teleosauridae, Steneosaurus, denticles, durophagy, functional ecology, Mesozoic, United Kingdom
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 383932
URI: http://eprints.soton.ac.uk/id/eprint/383932
ISSN: 0567-7920
PURE UUID: f0c58d2a-bafd-4d2f-8f2c-042ed8ac3787

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Date deposited: 12 Nov 2015 10:27
Last modified: 07 Jan 2022 21:44

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Contributors

Author: Mark T. Young
Author: Brian Beatty
Author: Stephen Brusatte
Author: Lorna Steel

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