Neurology: An ancient sensory organ in crocodilians

@article{Soares2002NeurologyAA,
  title={Neurology: An ancient sensory organ in crocodilians},
  author={Daphne Soares},
  journal={Nature},
  year={2002},
  volume={417},
  pages={241-242}
}
  • D. Soares
  • Published 16 May 2002
  • Environmental Science
  • Nature
Crocodilians hunt at night, waiting half-submerged for land-bound prey to disturb the water surface. Here I show that crocodilians have specialized sensory organs on their faces that can detect small disruptions in the surface of the surrounding water, and which are linked to a dedicated, hypertrophied nerve system. Such 'dome' pressure receptors are also evident in fossils from the Jurassic period, indicating that these semi-aquatic predators solved the problem of combining armour with tactile… 

Tactile sensing in specialized predators – from behavior to the brain

  • K. Catania
  • Biology, Psychology
    Current Opinion in Neurobiology
  • 2012

Contributions to a Discussion of Spinosaurus aegyptiacus as a Capable Swimmer and Deep-Water Predator

TLDR
The muscular neck permitted ‘pivot’ feeding, where the prey’s escape abilities were overcome by rapid dorsoventral head movement, facilitated by crest-mediated lower friction.

Hydrodynamic reception in the Australian water rat, Hydromys chrysogaster

TLDR
It is shown that Hydromys can detect water motions with its whiskers, and no responses to surface waves generated by a vibrating rod and resembling the surface waves caused by struggling insects were found.

Mechanoreception in Secondarily Aquatic Vertebrates

TLDR
This chapter provides evidence that especially secondarily aquatic tetrapods may actively use this sensory modality for the exploration of their environment.

Do crocodiles co-opt their sense of "touch" to "taste"? A possible new type of vertebrate sensory organ

TLDR
It is found that morphologically similar domed sensory organs present on the post-cranial scales of crocodylid but not alligatorid crocodilians flatten when exposed to increased osmotic pressure, such as that experienced when swimming in sea water hyper-osmotic to the body fluids.

Crocodile inspired Dome Pressure sensor for hydrodynamic sensing

TLDR
In this study, a dome structure embedded with piezoelectric pressure sensors is constructed, which carries out the mechano-receptive function of DPRs for direction detection, and demonstrates that the proposed dome structure could determine the direction of the origin of a disturbance.

Crocodylians evolved scattered multi-sensory micro-organs

TLDR
The ancestral vertebrate diffused sensory system of the skin was transformed in the crocodylian lineages into an array of discrete multi-sensory micro-organs innervated by multiple pools of sensory neurons, resulting in a highly-armored, but very sensitive, skin.
...

References

SHOWING 1-5 OF 5 REFERENCES

Electroreceptors in the platypus

TLDR
Direct electrophysiological evidence is presented for the existence of electroreceptors in the bill of the platypus, which has been known since the last century that the bill contains densely packed arrays of specialized receptor organs and their afferent nerves.

Morphology and ultrastructure of possible integumentary sense organs in the estuarine crocodile (Crocodylus porosus)

TLDR
The morphology of the ISOs suggests that sensory organs on the amniote integument have a mechanosensory function, and the structure of ISOs, in Crocodylus porosus, suggests that they are sensory organs.

The ultrastructure of lamellated mechanoreceptors in the skin of reptiles

  • M. Düring
  • Biology
    Zeitschrift für Anatomie und Entwicklungsgeschichte
  • 2004
TLDR
The lamellae (inner core) of the encapsulated receptor with a capsule space have a structure similar to that of the inner core of the Vater-Pacinian corpuscle.

Ancient Smaller Vertebrates. (Book Reviews: In the Shadow of the Dinosaurs. Early Mesozoic Tetrapods.)

TLDR
The fossil record of Late Triassic and Jurassic amphibians: fossil record and phylogeny, with special emphasis on the Lepidosauromorpha, and faunal Assemblages and Faunal Change are presented.