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|Brown basilisk, Basiliscus vittatus, Costa Rica|
Four, see text.
Basiliscus is a genus of large corytophanid lizards, commonly known as basilisks, which are endemic to southern Mexico, Central America, and northern South America. The genus contains four species, which are commonly known as the Jesus Christ lizard, or simply the Jesus lizard, due to their ability to run across water for significant distances before sinking.
Taxonomy and etymology
Both the generic name, Basiliscus, and the common name, "basilisk", derive from the Greek basilískos (βασιλίσκος) meaning "little king". The specific epithet, vittatus, which is Latin for "striped", was given in Carl Linnaeus' 10th edition of Systema Naturae.
Basilisks on average measure 70 to 75 cm (28 to 30 in) in total length (including tail). Their growth is perpetual, fast when they are young and nonlinear for mature basilisks. Their long crest-like sails, reinforced in three distinct points (head, back, and tail), confer the impression of creatures such as Dimetrodon and Edaphosaurus. Their skin is shed in pieces.
Running on water
Basilisks sometimes run bipedally. Basilisks have the ability to "run" on water, and because of this, they have been dubbed the "Jesus Christ lizard" in reference to the biblical passage of Matthew 14:22-34. On water, basilisks can run at a velocity of 1.5 meters (4.9 feet) per second for approximately 4.5 meters (15 feet) before sinking on all fours and swimming. Flaps between their toes help support basilisks, creating a larger surface and pockets of air, giving them the buoyancy needed to run across water. They can also sustain themselves on all fours while "water-walking" to increase the distance travelled above the surface by about 1.3 meters (4.3 feet).
A similar behavior, running bipedally across water, is known from the sailfin lizards and a few species of anole lizards. Basilisks and sailfin lizards share the specialized toe fringes, which however are lacking in the anoles.
Other defense mechanisms
Basilisks can burrow into sand to hide from predators; a ring of muscles around both nostrils prevents sand from entering the nose.
Habitat and geographic range
The species Basiliscus vittatus (brown basilisk) has been introduced to Florida. It has adapted to the colder winters by burrowing into leaf litter for warmth. Current reports sight the brown basilisk as far north as Fort Pierce, on the state's East Coast, where small groups have crept up the North Fork of the Saint Lucie River. Mainly it has been seen in Boca Raton and other cities in Palm Beach County.
- Basiliscus basiliscus (Linnaeus, 1758) – common basilisk
- Basiliscus galeritus A.M.C. Duméril & A.H.A. Duméril, 1851 – red-headed basilisk
- Basiliscus plumifrons Cope, 1875 – plumed basilisk
- Basiliscus vittatus Wiegmann, 1828 – brown basilisk, striped basilisk
- Sprackland, Robert George (1992). Giant lizards. Neptune, New Jersey: T.F.H. Publications. ISBN 0-86622-634-6.
- How "Jesus Lizards" Walk on Water. News.nationalgeographic.com. Retrieved on 2010-08-19.
- Leal, Knox & Losos (2002). Lack of divergence in aquatic Anolis lizards. Evolution 56(4): 785–791. doi:[0785:LOCIAA2.0.CO;2 10.1554/0014-3820(2002)056[0785:LOCIAA]2.0.CO;2]
- Bauer; Jackman (2008). "Global diversity of lizards in freshwater (Reptilia: Lacertilia)". Hydrobiologia. 595 (1): 581–586.
- Powell R, Conant R, Collins JT (2016). Peterson Field Guide to Reptiles and Amphibians of Eastern and Central North America, Fourth Edition. Boston and New York: Houghton Mifflin Harcourt. xiv + 494 pp., 47 plates, 207 figures. ISBN 978-0-544-12997-9. (Basiliscus vittatus, p. 276 + Plate 24).
- "Basiliscus ". The Reptile Database. www.reptile-database.org.
- "Basiliscus plumifrons ". The Reptile Database.
- Jesus Lizard Robot An attempt at building a robotic version of the Jesus Lizard
- How "Jesus Lizards" Walk on Water
- Jesus Lizards Walk on Water Video
- Boulenger GA (1885). Catalogue of the Lizards in the British Museum (Natural History). Second Edition. Volume II. Iguanidæ ... London: Trustees of the British Museum (Natural History). (Taylor and Francis, printers). xiii + 497 pp. + Plates I-XXIV. (Genus Basiliscus, pp. 106-107).
- Laurenti JN (1768). Specimen medicum, exhibens synopsin reptilium emendatam cum experimentis circa venena et antidota reptilium austriacorum. Vienna: Joan. Thom. Nob. de Trattnern. 214 pp. + Plates I-V. (Basiliscus, new genus, p. 50). (in Latin).