1 Miocene Proboscidean Tooth Found in Evaporite Karst Sinkhole near Gate, Oklahoma Bryce L. Bonnet University of Oklahoma, Department of Biology, Norman, OK 73019 Nicholas J. Czaplewski Oklahoma Museum of Natural History, Norman, OK 73072 Kent S. Smith 2NODKRPD6WDWH8QLYHUVLW\&HQWHUIRU+HDOWK6FLHQFHV2൶FHRI$PHULFDQ,QGLDQV LQ0HGLFLQHDQG6FLHQFH7XOVD2.
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Figure 1. Photograph and interpretive sketch of the fossil locality and collapse sink (with trees growing at the center of the base) in which the partial gomphothere tooth (Oklahoma Museum of Natural History 79124) occurred, Beaver County, Oklahoma. X indicates the spot where the tooth was found. View is toward the south.
Proc. Okla. Acad. Sci. 98: pp 1 - 5 (2018) 3
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Results and Discussion
7KHWRRWKLVSDUWRIDORZHUOHIWPRODUHLWKHU P RU P )LJXUH 2XU LQLWLDO XQFHUWDLQW\ DERXWZKHWKHULWLVDQPRUPVWHPVIURPWKH IDFWWKDWDWOHDVWKDOIRIWKHWRRWKLVPLVVLQJ,WV VL]HPDWFKHVEHWWHUWKDWRIPVDQGLVODUJHUWKDQ m2s of other gomphothere teeth in the OMNH YHUWHEUDWHSDOHRQWRORJ\FROOHFWLRQ,QDGGLWLRQ Figure 2. Dental nomenclature for the lower LW VKRZV D ZHDU IDFHW RQ RQH HQG FDXVHG E\ left molar of a gomphothere adapted from LQWHUGHQWDOFRQWDFWZLWKDQDGMDFHQWPRODU:H 7DVV\ ¿JE DQGDSSOLHGWR2NODKRPD LQWHUSUHWWKDWHQGDVWKHDQWHULRUHQGRIDQP specimen (OMNH 79124). Heavy dashed because the m3 is the last tooth to appear in line indicatHV the median sulcus, which DGXOWJRPSKRWKHUHVDQGWKHSRVWHULRUHQGFRXOG separates the pretrite and posttrite aspects QRW KDYH EHHQ LQ FRQWDFW ZLWK DQRWKHU WRRWK of the tooth. Abbreviations: acg, anterior 7KH P LV DW D UHODWLYHO\ OLJKW VWDJH RI ZHDU cingulum; aprcc1, anterior pretrite central DQGKDVYHU\WKLFNHQDPHOZLWKDVLPSOHHQDPHO conule of 1st lophid (paraconid); aprcc2, SDWWHUQFRPSRVHGRIVLQJOHWUHIRLOV'XHWRWKH anterior pretrite central conule of 2nd lophid; LQFRPSOHWHQHVVRIWKHPRODUZHZHUHRQO\DEOH HFWI HFWRÀH[XV RI st interlophid; ectf2, WRPDNHRQHPHDQLQJIXOPHDVXUHPHQW WKHZLGWK HFWRÀH[XVRIndLQWHUORSKLG HQWIHQWRÀH[XV RIWKH¿UVWORSKLGLVPP of 1st interlophid; lcg, lingual cingulum; meso, mesoconelet of each half-lophid on either side :HDGRSWHGWKHGHQWDOWHUPLQRORJ\SURSRVHG (pretrite or posttrite) of the median sulcus; E\ 7DVV\ ¿J WUDQVODWHG WR (QJOLVK ms, median sulcus; po1, posttrite main cusp 8VLQJ D PRGHO GHVFULELQJ WKH GHJUHHV RI of 1st lophid (metaconid); popcc1, posterior ]\JRGRQW\ GHYHORSHG E\ :DQJ HW DO posttrite central conules of 1st lophid; pprcc1, ZHGHWHUPLQHGWKDWWKHVLQNKROHWRRWKGLVSOD\HG posterior pretrite central conule of 1st lophid OHYHO ]\JRGRQW\ LQGLFDWLQJ D UHODWLYHO\ (protoconulid); pprcc2, posterior pretrite SULPLWLYHOHYHORIFRPSOH[LW\FRPSDUHGWRRWKHU central conule of 2nd lophid; pr1, pretrite JRPSKRWKHUHVDQGPDVWRGRQV6SHFL¿FDOO\WKH main cuspid of 1st lophid (protoconid); pr2, P VKRZV WKH IROORZLQJ FKDUDFWHULVWLFV EOXQW pretrite main cuspid of 2nd lophid. Scale bar SUHWULWH PDLQ FXVSLG VLQJXODU QRQFUHVWOLNH = 5 cm. SUHWULWHPHVRFRQHOHWZHDNQRQFUHVWOLNHSUHWULWH 7KHVH PRUSKRORJLFDO FKDUDFWHULVWLFV FHQWUDOFRQXOHVEOXQWQRQFUHVWOLNHSRVWULWHPDLQ GHPRQVWUDWHWKDWWKHWRRWKEHORQJVWRWKHJHQXV FXVSWKDWLVDQWHURSRVWHULRUO\FRPSUHVVHGODUJH Gomphotherium ZKLFK KDV D IRVVLO UHFRUG DQGEOXQWQRQFUHVWOLNHSRVWULWHPHVRFRQHOHWWKDW LQ 1RUWK $PHULFD (XUDVLD DQG $IULFD 7KH LVQRWVXEGLYLGHGZHDNSRVWULWHFHQWUDOFRQXOHV only species of Gomphotherium currently DQGDQWHURSRVWHULRUO\QDUURZLQWHUORSKLGV UHFRJQL]HGLQ1RUWK$PHULFDLVGomphotherium Proc. Okla. Acad. Sci. 98: pp 1 - 5 (2018) 4 B.L. Bonnet, N.J. Czaplewski, and K.S. Smith
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