Premontreia (Oxyscyllium), 1997
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publication ID |
https://doi.org/ 10.5070/P9361043964 |
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publication LSID |
lsid:zoobank.org:pub:3F95876E-933FF-48AF-9CF0-A840A333220B |
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persistent identifier |
https://treatment.plazi.org/id/03E787A6-FE38-FF97-A80B-FE67FED3F9F8 |
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treatment provided by |
Felipe |
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scientific name |
Premontreia (Oxyscyllium) |
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CF. PR. (O.) GILBERTI ( CASIER, 1946)
FIG. 5H–N View Figure 5
Material examined —SC2013.38.29, tooth ( Fig. 5H, I View Figure 5 ); SC2013.38.30, tooth ( Fig. 5J–L View Figure 5 ); SC2013.38.31, tooth ( Fig. 5M, N View Figure 5 ); SC2013.38.32, tooth; SC2013.38.33, tooth; SC2013.38.34, incomplete tooth.
Remarks —The root morphology of our six specimens leads us to assign the teeth to Premontreinae Cappetta, 1992, which currently contains the genera Premontreia and Pachyscyllium Reinecke and others, 2005. Noubhani and Cappetta (1997) have since divided Premontreia into two subgenera: Premontreia and Oxyscyllium. Although only the dentine core of the Dry Branch Formation specimens is preserved, we can discern that the tooth crowns bore coarse basal longitudinal ridges and they were distally inclined, which is in contrast to what is seen on teeth of the various Oligocene to Pliocene species of Pachyscyllium that have been described ( Cappetta, 1970, Reinecke and others 2005, Haye et al. 2008, Reinecke et al. 2008). With respect to crown shape, the Dry Branch Formation teeth are identifiable to the subgenus Premontreia (Oxyscyllium) Noubhani and Cappetta, 1997 because of the large and well differentiated lateral cusplets. Additionally, we believe that the teeth compare favorably to Pr. (O.) gilberti , a species formerly placed within Scyliorhinus ( Casier 1946, Bor 1985, Nolf 1988, Kemp et al. 1990, Case et al. 1996, also Reinecke et al. 2008). We also consider specimens that Parmley and Cicimurri (2003) identified as Scyliorhinus gilberti and material identified as Scy. distans (Probst, 1879) by Manning and Standhardt (1986:fig. 1, no. 2) to be conspecific with the Dry Branch taxon.
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