Pelobates sp.
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publication ID |
https://doi.org/ 10.26879/1156 |
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persistent identifier |
https://treatment.plazi.org/id/03C287BE-832E-780C-D75F-F8F6F007F58C |
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treatment provided by |
Felipe |
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scientific name |
Pelobates sp. |
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Figure 4 View FIGURE 4 C-J
Material. UBB V 945/1-2 one premaxilla, one frontoparietal fragment; UBB V 946/1-2 two fragmentary maxillae; UBB V 947 one fragmentary presacral vertebra.
Description. The premaxilla is well-preserved with moderately high and laterally curved dorsal process and relatively wide pars dentalis ( Figure 4C View FIGURE 4 ); there are 15 tooth positions preserved; the palatine process is prominent and moderately long. The labial surface of the premaxilla is devoid of primary sculpture.
The frontoparietal preserves the left lateral part of the bone consisting of the laterally tapering processus lateralis superior and the orifice of the canalis arteriae temporalis ( Figure 4 View FIGURE 4 E-F). The dorsal side is covered by a sculpture consisting of tubercle and irregular crests. The lateral superior process exposes a relatively thin articular surface for the dorsal process of the squamosal to form a fronto-squamosal arch.
The maxillae preserve the posterior part of the bone with a short, wide and mediolaterally flattened pterygoid process; posterior to the latter structure several foramina pierce the media wall of the maxilla ( Figure 4 View FIGURE 4 G-H). The labial surface bears a primary sculpture consisting of crests and tubercles.
The angulosplenial consists of a small sinuous bone preserving the coronoid process attached to the medial side of the Meckel's groove. The posteriormost part of the angulosplenial, called the pars spatulaeformis praearticularis (Venczel et al., 2013) is not widened ( Figure 4D View FIGURE 4 ).
The presacral vertebra is procoelous (the condyle is broken off) with elevated neural lamina of imbricate type, pierced by several small foramina; the lateral margins of this elevated part form a bony ridge extending above the postzygapophyses; the neural spine is low and shorter than the posterior margins of the postzygapophyses ( Figure 4 View FIGURE 4 I-J). The lateral margins of the neural arch preserves in each side the foramen for exit of the spinal nerve. The remnant of the transverse process projects anterolaterally indicating that the vertebra represents a posterior presacral position.
Remarks. The moderately high and laterally curved dorsal process of the premaxilla is reminiscent of Pelobates syriacus (pers. obs.) and in a lesser degree of P. sanchizi (Venczel, 2004: fig. 6I), however, in the latter the dorsal process is tapering distally. In the recent P. fuscus the dorsal process is relatively short and shallowly bent laterally (Roček, 1981: fig. 25a, b). The relatively slender articular surface exposed by the processus lateralis superior of the frontoparietal indicates the presence of a relatively narrow fronto-squamosal arch, which is of variable width in recent P. syriacus , always narrow in the Pliocene P. praefuscus (Syromyatnikova, 2019) , but distinctly wider in recent P. cultripes (Roček, 1981: fig. 57) and in the fossil P. sanchizi and P. decheni (Venczel, 2004) ; P. fuscus lacks a fronto-squamosal arch (Roček, 1981: fig. 57). The outer sculpture of the frontoparietal and maxillae consists of widened pits enclosed by bony crests and rear tubercles, reminiscent of P. syriacus and P. sanchizi . The presence of spinal nerve foramina in the presacral vertebrae of Pelobates is rarely present in P. syriacus (Sanchiz and Młynarski, 1979) and P. sanchizi (Venczel, 2004) , but never reported in P. praefuscus (Syromyatnikova, 2019) and P. fuscus .
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Royal British Columbia Museum - Herbarium |
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