Pachyscyllium, REINECKE ET AL., 2005
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publication ID |
https://doi.org/ 10.5070/P939056976 |
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publication LSID |
lsid:zoobank.org:pub:13E6A6E9-DE0F-4C71-BE40-2957F48D9F70 |
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persistent identifier |
https://treatment.plazi.org/id/03DF0849-4138-FFD6-3DE0-F9F0FCC3FCC7 |
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treatment provided by |
Felipe |
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scientific name |
Pachyscyllium |
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PACHYSCYLLIUM REINECKE ET AL., 2005 PACHYSCYLLIUM SP.
FIG. 3D–F View Figure 3
Type species — Pachyscyllium albigensis Reinecke et al., 2005 ; lower Oligocene Stadecken Formation , Rhineland-Pfalz, Germany .
Referred specimen (n=1) —SC2007.36.5.
Description —The specimen lacks the mesial corner of the crown and most of the root. As preserved, the crown measures 2.0 mm in height and consists of a rather tall main cusp, with a single lateral cusplet occurring on the distal side. The main cusp is distally inclined, the cutting edges are smooth, and the apex is blunt ( Fig. 3D, E View Figure 3 ). The mesial cutting edge is sinuous, whereas the distal edge is rather straight. The labial face is convex and generally smooth, but the thickened crown foot bears very short and wide vertical ridges across the entire crown width ( Fig. 3D View Figure 3 ). The lingual face is very convex and smooth except for some short vertical ridges on the mesial side of the crown ( Fig. 3F View Figure 3 ). The preserved cusplet is rather short but wide, located very low on the crown, and bluntly pointed. Additionally, its labial face bears vertical ridges but the lingual face is smooth.
Remarks —The gross morphology of SC2007.36.5 differs significantly from that of a second scyliorhinid taxon that we recovered, which is discussed in more detail below. Although it superficially resembles the Oligo-Miocene species Pachyscyllium albigensis Reinecke et al., 2005 , P. braaschi Reinecke et al., 2005 , P.dachiardii ( Lawley, 1876) , and P. distans ( Probst, 1879) , SC2007.36.5 clearly differs from those species by having robust vertical ridges at the labial crown foot. In contrast, the former three species appear to have completely smooth labial crown faces.Specimen SC2007.36.5 and teeth of P.distans have labial ornamentation, but the singular cusplet preserved on the South Carolina tooth is much shorter than those occurring on P. distans teeth ( Case 1980, Reinecke et al. 2001, Reinecke et al. 2005, Collareta et al. 2020).
There are only two other Oligocene records of Pachyscyllium in North America, including one from North Carolina (Atlantic Coastal Plain) and one from Alabama (Gulf Coastal Plain). Specimen SC2007.36.5 differs from P. distans reported from North Carolina ( Case 1980) by the features outlined above, and it differs from Pachyscyllium sp. recently reported from Alabama ( Ebersole et al. 2021) by having short labial longitudinal plications. The P. distans teeth from North Carolina were originally reported as being derived from the Trent Marl and considered of early Miocene (Aquitanian) age, but this fossiliferous deposit is now regarded as part of the River Bend Formation of Oligocene age ( Rossbach and Carter 1991, Harris et al. 2000). The Alabama specimen was collected from the Rupelian Glendon Limestone Member of the Byram Formation ( Ebersole et al. 2021) and is slightly older than the Ashley Formation tooth.
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