Naturwissenschaften

, Volume 101, Issue 5, pp 453–456 | Cite as

Complex rostral neurovascular system in a giant pliosaur

  • Davide Foffa
  • Judyth Sassoon
  • Andrew R. Cuff
  • Mark N. Mavrogordato
  • Michael J. Benton
Short Communication

Abstract

Pliosaurs were a long-lived, ubiquitous group of Mesozoic marine predators attaining large body sizes (up to 12 m). Despite much being known about their ecology and behaviour, the mechanisms they adopted for prey detection have been poorly investigated and represent a mystery to date. Complex neurovascular systems in many vertebrate rostra have evolved for prey detection. However, information on the occurrence of such systems in fossil taxa is extremely limited because of poor preservation potential. The neurovascular complex from the snout of an exceptionally well-preserved pliosaur from the Kimmeridgian (Late Jurassic, c. 170 Myr ago) of Weymouth Bay (Dorset, UK) is described here for the first time. Using computed tomography (CT) scans, the extensive bifurcating neurovascular channels could be traced through the rostrum to both the teeth and the foramina on the dorsal and lateral surface of the snout. The structures on the surface of the skull and the high concentrations of peripheral rami suggest that this could be a sensory system, perhaps similar to crocodile pressure receptors or shark electroreceptors.

Keywords

Pliosaurus Neurovascular system Prey detection Digital model CT scans 

References

  1. Baur G (1892) On the morphology of the skull in the Mosasauridae. J Morphol 7:1–22CrossRefGoogle Scholar
  2. Bellairs A’A (1949) Observation on the snout of Varanus, and a comparison with that of other lizards and snakes. J Anat 83:116–146Google Scholar
  3. Benson RBJ, Evans M, Smith AS, Sassoon J, Moore-Faye S, Ketchum SHF, Forrest R (2013) A giant pliosaurid skull from the Late Jurassic of England. PLoS ONE 8(5):e65989PubMedCentralPubMedCrossRefGoogle Scholar
  4. Buchy M-C, Frey E, Salisbury SW (2006) The internal cranial anatomy of the Plesiosauria (Reptilia, Sauropterygia): evidence for a functional secondary palate. Lethaia 39:289–303CrossRefGoogle Scholar
  5. Burnstock G (1969) Evolution of the autonomic innervation of visceral and cardiovascular systems in vertebrates. Pharmacol Rev 21:247–324PubMedGoogle Scholar
  6. Czech-Damal NU, Liebschner A, Miersch L, Klauer G, Hanke FD, Marshall C, Dehnhardz G, Hanke W (2011) Electroreception in the Guiana dolphin (Sotalia guianensis). Proc R Soc B 22:663–668Google Scholar
  7. Dal Sasso C, Maganuco S, Buffetaut E, Mendez MA (2005) New information on the skull of the enigmatic theropod Spinosaurus, with remarks on its sizes and affinities. J Vertebr Paleontol 25:888–896CrossRefGoogle Scholar
  8. Dal Sasso C, Maganuco S, Cioffi A (2009) A neurovascular cavity within the snout of the predatory dinosaur Spinosaurus. First International Congress on North African Vertebrate Palaeontology, 25-27 May 2009 Marrakech (Morocco), 22-23Google Scholar
  9. Godefroit P (1993) The skull of Stenopterygius longifrons (Owen, 1881). Rev Paléobiol 7:67–84Google Scholar
  10. Goldfuss A (1845) Der Schädelbau des Mosasaurus, durch Beschreibung einer neuen Art dieser Gattung erläutert. Nova Acta Acad Caesar Leopold-Carol German Nat Curios 21:1–28Google Scholar
  11. Halstead LB (1989) Plesiosaur locomotion. Q J Geol Soc Lond 146:37–40Google Scholar
  12. Iordansky NN (1973) The skull of the Crocodilia. In: Gans C, Parsons TS (eds) The Biology of the Reptilia, 4th edn. Academic Press, London, pp 201–262Google Scholar
  13. Kear B (2005) Cranial morphology of Platypterygius longmani Wade, 1990 (Reptilia: Ichthyosauria) from the Lower Cretaceous of Australia. Zool J Linnean Soc 145:583–622CrossRefGoogle Scholar
  14. Ketchum HF, Benson RBJ (2010) Global interrelationships of Plesiosauria (Reptilia, Sauropterygia) and the pivotal role of taxon sampling in determining the outcome of phylogenetic analyses. Biol Rev 85:361–392PubMedCrossRefGoogle Scholar
  15. Ketchum HF, Benson RBJ (2011a) A new pliosaurid (Sauropterygia, Plesiosauria) from the Oxford Clay Formation (Middle Jurassic, Callovian) of England: evidence for a gracile, longirostrine grade of Early-Middle Jurassic pliosaurids. Spec Pap Palaeontol 86:109–129Google Scholar
  16. Ketchum HF, Benson RBJ (2011b) The cranial anatomy and taxonomy of Peloneustes philarchus (Sauropterygia, Pliosauridae) from the Peterborough Member (Callovian, Middle Jurassic) of the United Kingdom. Palaeontology 54:639–665CrossRefGoogle Scholar
  17. Ketchum H, Smith AS (2010) The anatomy and taxonomy of Macroplata tenuiceps (Sauropterygia, Plesiosauria) from the Hettangian (Lower Jurassic) of Warwickshire, United Kingdom. J Vertebr Paleontol 30:1069–1081CrossRefGoogle Scholar
  18. Klein N (2009) Skull morphology of Anarosaurus heterodontus (Reptilia: Sauropterygia: Pachypleurosauria) from the Lower Muschelkalk of the Germanic Basin (Winterswijk, The Netherlands). J Vertebr Paleontol 29:665–676CrossRefGoogle Scholar
  19. Lingham-Soliar T (1995) Anatomy and functional morphology of the largest marine reptile known, Mosasaurus hoffmanni (Mosasauridae, Reptilia) from the Upper Cretaceous, Upper Maastrichtian of the Netherlands. Philos Trans R Soc B 347:155–172CrossRefGoogle Scholar
  20. Maisch MW (1998) A new ichthyosaur genus from the Posidonia Shale (Lower Toarcian, Jurassic) of Holzmaden, SW-Germany, with comments on the phylogeny of post-Triassic ichthyosaurs. Neues Jahrb Geol Palaontol Abh 209:47–78Google Scholar
  21. Massare JA (1987) Tooth morphology and prey preference of Mesozoic marine reptiles. J Vertebr Paleontol 7:121–137CrossRefGoogle Scholar
  22. McGowan C (1973) The cranial morphology of the Lower Liassic latipinnate ichthyosaurs of England. Bull Nat Hist Mus Lond (Geol) 24:1–109Google Scholar
  23. Motani R (2002) Swimming speed estimation of extinct marine reptiles: energetic approach revisited. Paleobiology 28:251–262CrossRefGoogle Scholar
  24. O’Gorman JP, Gasparini Z (2013) Revision of Sulcusuchus erraini (Sauropterygia, Polycotylidae) from the Upper Cretaceous of Patagonia, Argentina. Alcheringa 37:163–176CrossRefGoogle Scholar
  25. O’Keefe F, Chiappe L (2011) Viviparity and K-selected life history in a Mesozoic marine plesiosaur (Reptilia, Sauropterygia). Science 333:870–873PubMedCrossRefGoogle Scholar
  26. Rieppel O (1995) The genus Placodus: systematics, morphology, paleobiogeography, and paleobiology. Fieldiana Geol N S 31:1–44Google Scholar
  27. Romer AS (1956) Osteology of the Reptiles. University of Chicago Press, IllinoisGoogle Scholar
  28. Sassoon J, Noè LF, Benton MJ (2012) Cranial anatomy and palaeopathology of an Upper Jurassic pliosaur (Reptilia: Sauropterygia) from Westbury, Wiltshire. Palaeontology 55:743–773CrossRefGoogle Scholar
  29. Seebacher F, Franklin CE (2005) Physiological mechanisms of thermoregulation in reptiles: a review. J Comp Physiol B 175:533–541PubMedCrossRefGoogle Scholar
  30. Smith AS, Vincent P (2010) A new genus of pliosaur (Reptilia: Sauropterygia) from the Lower Jurassic of Holzmaden, Germany. Palaeontology 53:1049–1063CrossRefGoogle Scholar
  31. Soares D (2002) An ancient sensory organ in crocodilians. Nature 417:241–242PubMedCrossRefGoogle Scholar
  32. Taylor MA (1992) Functional anatomy of the head of the large aquatic predator Rhomaleosaurus zetlandicus (Plesiosauria: Reptilia) from the Toarcian (Lower Jurassic) of Yorkshire, England. Philos Trans R Soc B 335:247–280CrossRefGoogle Scholar
  33. Taylor MA, Cruickshank ARI (1993) Cranial anatomy and functional morphology of Pliosaurus brachyspondylus (Reptilia: Plesiosauria) from the Upper Jurassic of Westbury, Wiltshire. Philos Trans R Soc B 341:399–418CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Davide Foffa
    • 1
  • Judyth Sassoon
    • 1
  • Andrew R. Cuff
    • 1
  • Mark N. Mavrogordato
    • 2
  • Michael J. Benton
    • 1
  1. 1.School of Earth SciencesUniversity of BristolBristolUK
  2. 2.μ-VIS CT Imaging Centre, Engineering SciencesUniversity of SouthamptonSouthamptonUK

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