Fig 2 - available via license: Creative Commons Attribution 4.0 International
Content may be subject to copyright.
Storchodon cingulatus NLMH 110023, right lower molar (m1) in a lingual, b, b' occlusal (stereopair), c labial, and d ventral views. Langenberg Quarry, Lower Saxony, Germany; Süntel Formation, Late Jurassic (late Kimmeridgian) age. Scale bar equals 1 mm. ic interradical crest
Source publication
Three new lower molars of Storchodon cingulatus and a fragmentary upper molar confirm its morganucodontan affinities. Cusps b and c are relatively higher than in Morganucodon, and cusp c is larger than cusp b. Cusp a is asymmetric, with slightly distally recurved tip. All known lower Storchodon molars have a pronounced furcation between the roots o...
Context in source publication
Context 1
... NLMH 110024 (Fig. 3) is a right lower molar. It is wider (and somewhat shorter) than NLMH 100023, has a much smaller cusp b, and possesses an indentation for molar interlock at the mesial end, bordered by cusps e and f, of which the latter is hardly discernible. The proportions of the molar and presence of a mesial indentation suggest that it is an m3. ...
Similar publications
A new specimen of Haplocanthosaurus is described based on bones excavated from the Late Jurassic Dry Mesa Dinosaur Quarry near Delta, Colorado. The specimen consists of seven dorsal vertebrae and a right tibia and is identified as Haplocanthosaurus based on the dorsally angled transverse processes, tall neural arch peduncles, low parapophyses relat...
Citations
... The scans of specimens MG Gui Mam 1150 and MG Gui Mam 1155 (Dryolestes leiriensis) were provided by Julia Schultz. For comparison to the teeth of Storchodon cingulatus, scans of the specimens NLMH 100,023 and NLMH 105,654, described in Martin et al. (2019Martin et al. ( , 2024, were used. For segmentation, the software Avizo 8 (Thermo Fisher Scientific, Waltham, MA, USA) was used. ...
... Eutriconodontan molars are another good functional equivalent to carnassials, as they also emphasize the cutting function, with cusp d increasing in size and being integrated in the cutting function (Jäger et al. 2020). In some late surviving morganucodontans from the Upper Jurassic, cusp c is enlarged, as seen in Storchodon cingulatus (Martin et al. 2024). This results in a lower molar morphology that is strikingly similar to lower carnassials with a unicuspid talonid. ...
The carnassial teeth of Carnivora and Dasyuromorphia are characterized by the enlargement of the carnassial blades and reduction of crushing structures. In some species, the highly carnassialized teeth exhibit a unicuspid talonid with only the hypoconid present (“trenchant heel”). This condition is similar to that seen in the molars of pretribosphenic cladotherians such as Dryolestida, with a single talonid cusp and hypoflexid groove. Tooth wear and reconstruction of the power stroke show that the hypoflexid of the trenchant heel occludes with the paracone of the distal upper antagonist, providing a cutting and guiding function during the power stroke, and maintaining a uniform inclination of the tooth movement up to the point of centric occlusion. In case of the Dasyuromorphia, this occlusal relationship is most pronounced between the distal molars (M4/m4), whereas in the Carnivora it occurs between the upper and lower mesial molars (M1/m1). The occurrence of distal hypoflexid-like grooves is a recurring trend in mammal evolution, before and after the evolution of tribosphenic molars with multicuspid talonid.
... Eutriconodontan molars are another good functional equivalent to carnassials, as they also emphasize the cutting function, with cusp d increasing in size and being integrated in the cutting function (Jäger et al. 2020). In some late surviving morganucodontans from the Upper Jurassic, cusp c is enlarged, as seen in Storchodon cingulatus (Martin et al. 2024). This results in a lower molar morphology that is strikingly similar to lower carnassials with a unicuspid talonid. ...
The carnassial teeth of Carnivora and Dasyuromorphia are characterized by the enlargement of the carnassial blades and reduction of crushing structures. In some species, the highly carnassialized teeth exhibit a unicuspid talonid with only the hypoconid present (“trenchant heel”). This condition is similar to that seen in the molars of pretribosphenic cladotherians such as Dryolestida, with a single talonid cusp and hypoflexid groove. Tooth wear and reconstruction of the power stroke show that the hypoflexid of the trenchant heel occludes with the paracone of the distal upper antagonist, providing a cutting and guiding function during the power stroke, and maintaining a uniform inclination of the tooth movement up to the point of centric occlusion. In case of the Dasyuromorphia, this occlusal relationship is most pronounced between the distal molars (M4/m4), whereas in the Carnivora it occurs between the upper and lower mesial molars (M1/m1). The occurrence of distal hypoflexid-like grooves is a recurring trend in mammal evolution, before and after the evolution of tribosphenic molars with multicuspid talonid.
