Pinheirodontidae, Hahn & Hahn, 1999
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publication ID |
https://doi.org/ 10.5252/geodiversitas2022v44a25 |
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publication LSID |
urn:lsid:zoobank.org:pub:EA12DCB7-A5BE-4763-B805-25087EBD726D |
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DOI |
https://doi.org/10.5281/zenodo.6929064 |
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persistent identifier |
https://treatment.plazi.org/id/03C887B9-FF99-FFDA-76DE-A40AFE1CFC01 |
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treatment provided by |
Felipe |
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scientific name |
Pinheirodontidae |
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Pinheirodontidae indet.
( Fig. 33 View FIG A-H, M-P)
DESCRIPTION
Most of the multituberculate teeth discovered in Angeac-Charente can be referred to the family Pinheirodontidae , but it has not been possible to refer them to any existing genera. The material figured here includes a left p4 (ANG M-72), a left P1 (ANG M-03), a right P2 (ANG M-06), a left P3 (ANG M-22), a left?m2 (ANG M-105) and a left M2 (ANG M-32) ( Fig. 33 View FIG A-H, M-P).
The most mesial part of the blade-like p4 (ANG M-72) is missing ( Fig. 33A View FIG ). It possesses at least six serrations, and no basal labial cusp, a diagnostic feature of Pinheirodon ( Hahn & Hahn 1999; Kielan-Jaworowska et al. 2004). Nevertheless, the Angeac-Charente specimen has a straight, vertical, distal margin ( Fig. 33B View FIG ), while the latter is strongly convex just above the root in Pinheirodon .
The?m2 (ANG M-105) has a well-developed central basin. Labial cusps are missing and there are only two lingual cusps as in Bernardodon ( Fig. 33N View FIG ), whereas there are three in Pinheirodon ( Hahn & Hahn 1999) . Nevertheless, the tooth shape is considerably longer than wide, and precludes assigning it to Bernardodon ( Fig. 33M View FIG ).
The M2 (ANG M-32) shows a prominent anterolingual shelf ( Fig. 33O View FIG ), like that observed in the molars of Bernarodon and Pinheirodon (Kielan-Jaworowska et al. 2004) . As in the latter two genera there are three lingual cusps, but ANG M-32 differs from other pinheirodontids in lacking the labial cusps ( Fig. 33P View FIG ; Hahn & Hahn 1999).
The anterior upper premolars P1 (ANG M-03), P2 (ANG M-06) and P3 (ANG M-22) have 3-4 ribbed cusps arranged in two rows like in other “plagiaulacidans” ( Fig. 33 View FIG C-H; Kielan-Jaworowska et al. 2004). They are not very diagnostic and only tentatively assigned here to Pinheirodontidae , based on their similarities with the pinheirodontid teeth described by Hahn & Hahn (1999: fig. 58).
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.