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[Ngala]

A new basal elasmosaurid (Sauropterygia: Plesiosauria) from the Lower Cretaceous of Germany
Lagenanectes richterae Sachs, Hornung & Kear, 2017

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FIGURE 13. Life reconstruction of Lagenanectes richterae, gen. et sp. nov. Artwork by Frederik Spindler, 2015.

*This image is copyright of its original author

FIGURE 4. Lagenanectes richterae, gen. et sp. nov., BGR Ma 13328, holotype, reconstruction of the skull showing the preserved portions (shaded) in A, lateral and B, ventral views. The missing parts are reconstructed based on Libonectes spp. (partly after Carpenter 1997:figs. 2, and 5). Abbreviations: bo, basioccipital; den, dentary; in, internal naris; mx, maxilla; pal, palatine; pmx, premaxilla; ps, parasphenoid; pt, pterygoid; qu, quadrate; v, vomer. Scale bar equals 5 cm.

Abstract:
"Here we report on a new basal elasmosaurid plesiosaurian, Lagenanectes richterae, gen. et sp. nov., from the Lower Cretaceous (probably Upper Hauterivian) of Germany. The material includes a partial skull (cranium and mandible), the atlas-axis complex, additional cervical vertebrae, caudal vertebrae, an ilium, and limb elements. The basioccipital and atlas intercentrum are pathologically deformed, probably due to an osteomyelitic infection. Two potential autapomorphies were found in the mandible: (1) the alveolar margin at the symphysis is laterally expanded with the rostral-most alveoli being markedly procumbent and situated along the lateral margins of the dentaries; and (2) the ventral midline at the symphysis is produced into a prominent wedge-shaped platform indented by numerous irregular pits. Lagenanectes richterae, gen. et sp. nov., also shows a number of typical elasmosaurid traits, including a longitudinal lateral ridge on the cervical vertebral centra (although a ventral notch is absent) and teeth with oval cross-sections. Lagenanectes richterae, gen. et sp. nov., is one of the best-preserved plesiosaurians from the Lower Cretaceous of Europe." Reply