LACERTOIDEA, Estes, de Queiroz & Gauthier, 1988
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publication ID |
https://doi.org/ 10.5252/geodiversitas2020v42a20 |
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publication LSID |
urn:lsid:zoobank.org:pub:8FF2A078-CE45-4BF1-A681-00136F57375E |
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DOI |
https://doi.org/10.5281/zenodo.4488215 |
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persistent identifier |
https://treatment.plazi.org/id/03C587C7-430C-FFED-FBB8-FBE9492FFDE2 |
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treatment provided by |
Felipe |
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scientific name |
LACERTOIDEA |
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LACERTOIDEA View in CoL indet.
( Fig. 4A, B View FIG )
Lacerta sp., small form – Ivanov et al. 2006: 229, table 2 (in part).
MATERIAL. — MWQ, early Miocene, Burdigalian, Orleanian, MN 4: 2/2003 Reptile Joint: two left dentaries (Pal. 1571, 1572).
DESCRIPTION
Dentary
The preserved fragments represent the anterior and mid-portion of the two left dentaries. Meckel’s groove is fully open, although narrow in this region. It is roofed by a subdental shelf. The shelf gradually narrows posteriorly, caused by the presence of the facet for the splenial. This facet is situated on the ventral margin of the shelf. This facet reaches anteriorly to the level of the tenth tooth position (counted from anterior).The shelf is only slightly concave, so the small symphyseal region is only weakly elevated dorsally if compared to the posteriorly located shelf. A sulcus dentalis is present. The preserved portion of the dentary bears sixteen and half tooth positions (eight teeth are attached). The dental crest, which supports the teeth, is high(higherthan the ventrally located Meckel’s groove).Except for four labial foramina,which pierce the lateral side of the bone in its mid-line,the external surface is smooth.
Dentition
The implantation is pleurodont.Teeth are closely spaced with small interdental gaps. All teeth are badly preserved, with heavily weathered tooth crowns.
REMARKS
Unfortunately, the poor preservation does not allow a more precise determination of this specimen. The heavily weathered tooth crown might be the result of predation and digestion, especially by birds of prey. This dentary very likely represents a lacertid, but this cannot be fully demonstrated. If such an allocation is correct, then it resembles the material described here as Lacertidae indet. tooth morphotype 2 rather than 1. The main similarity is that the interdental gaps of teeth here are small and the dental crest is high.
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Museu Nacional, Universidade Federal do Rio de Janeiro |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
