Plestiodon laticeps

  (Redirected from Broad-headed Skink)

The broad-headed skink or broadhead skink (Plestiodon laticeps) is species of lizard, endemic to the southeastern United States.[1] The broadhead skink occurs in sympatry with the five-lined skink (Plestiodon fasciatus) and Southeastern five-lined skink (Plestiodon inexpectatus) in forest of the Southeastern United States. All three species are phenotypically similar throughout much of their development and were considered a single species prior to the mid 1930s.[3]

Broad-headed skink
Eumeces laticeps (male).jpg
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Family: Scincidae
Genus: Plestiodon
Species:
P. laticeps
Binomial name
Plestiodon laticeps
(Schneider, 1801)
Plestiodon laticeps distribution.png
Synonyms
  • Scincus laticeps Schneider, 1801
  • Plestiodon laticeps
    A.M.C. Duméril & Bibron, 1839
  • Eumeces laticeps Taylor, 1936
  • Plestiodon laticeps
    — Collins & Taggart, 2009 [2]

DescriptionEdit

Together with the Great Plains skink it is the largest of the "Plestiodon skinks", growing from a total length of 15 cm (5.9 in) to nearly 33 cm (13 in).

 
A male broad-headed skink, illustration from Holbrook's North American Herpetology, 1842.

The broad-headed skink gets its name from the wide jaws, giving the head a triangular appearance. Adult males are brown or olive brown in color and have bright orange heads during the mating season in spring. Females have five light stripes running down the back and the tail, similar to the Five-lined Skink. However, they can be distinguished by having five labial scales around the mouth, whereas Five-lined skinks have only four.[4] Juveniles are dark brown or black and also striped and have blue tails.

HabitatEdit

Broad-headed skinks are semi-arboreal lizards that are strongly associated with live oak trees. It does not appear that the lizards have a preference for tree size, rather they prefer trees with holes. Juveniles stay closer to the ground on low or fallen branches. [5] Males have been known to guard preferred trees that are surrounded with dense brushes to limit attack by predators and harbor prey.[6] Dead and decaying trees are important habitat resources for nesting. [7]

BehaviorEdit

Broad-headed skinks are the most arboreal of the North American Plestiodon. They forage on the ground, but also easily and often climb trees for shelter, to sleep, or to search for food. Broad-headed skinks often feed on what are called "hidden prey"; prey items that can only be located by searching under debris, soil or litter. [8] Broad-headed skinks are preyed on by a variety of organisms including carnivorous birds, larger reptiles, and mammals. Skinks prefer to flee by climbing a nearby tree or seeking shelter under foliage. [9] These skinks exhibit tail autotomy when caught by a predator. The tails break away and continue to move, distracting the predator and allowing the skink to flee. [10] When consuming large invertebrates, they often carry them to shelter to avoid being preyed upon during the prey handling time. [11]

ReproductionEdit

Males typically are larger than females.[12] The larger the female, the more eggs she will lay. Males thus often try to mate with the largest female they can find, and they sometimes engage in severe fights with other males over access to a female. Females will also mate with the largest males they can find, a result of the Good Genes Hypothesis. [13] Females emit a pheromone from glands in the base of the tail when they are sexually receptive and males can find them by tracking their chemical trails through tongue-flicking.[14] Males show higher tongue flicking rates when exposed to conspecific females verses heterospecific females when mating and will terminate behavioral interaction without initiating courtship if the pheromones do not match the species. [15] The female lays between 8 and 22 eggs, which she guards and protects until they hatch in June or July. Female broadhead skinks will lay their clutch in decaying log cavities, and they have been observed to create a sort of nest by packing down debris within their cavities.[16] The hatchlings have a total length of 6 centimetres (2.4 in) to 8 centimetres (3.1 in).

Geographic rangeEdit

Broad-headed skinks are widely distributed in the southeastern states of the United States, from the East Coast to Kansas and eastern Texas and from Ohio to the Gulf Coast.

NonvenomousEdit

These skinks (along with the similar Plestiodon fasciatus) are sometimes wrongly thought to be venomous.[17] Broad-headed skinks are nonvenomous.

See alsoEdit

NotesEdit

  1. ^ a b Hammerson, G.A. (2007). "Plestiodon laticeps". IUCN Red List of Threatened Species. 2007: e.T64231A12756745. doi:10.2305/IUCN.UK.2007.RLTS.T64231A12756745.en.
  2. ^ The Reptile Database. www.reptile-database.org.
  3. ^ Watson, Charles, M.; Formanowicz, Daniel, R. (2012). "A COMPARISON OF MAXIMUM SPRINT SPEED AMONG THE FIVE-LINED SKINK (PLESTIODON) OF THE SOUTHEASTERN UNITED STATES AT ECOLOGICALLY RELAVENT TEMPERATURES". Herpetological Conservation and Biology. 7 (1): 75–82.
  4. ^ Division., Connecticut. Department of Environmental Protection. Connecticut. Wildlife (1997). Five-lined skink. Connecticut Dept. of Environmental Protection, Wildlife Division. OCLC 43556290.
  5. ^ Vitt, Laurie; Cooper, William (1986). "Foraging and Diet of a Diurnal Predator (Eumeces Laticeps) Feeding on Hidden Prey". Journal of Herpetology. 20 (3): 408–415. doi:10.2307/1564503. JSTOR 1564503.
  6. ^ Cooper, William, E. (1993). "Tree Selection by the broad-headed skink, Eumeces laticeps: size, holes, and cover". Amphibia-Reptilia. 14 (3): 285–294. doi:10.1163/156853893X00480 – via Brill.
  7. ^ Hullinger, Allison; Cordes, Zackary; Riedle, Daren; Stark, William (2020). "Habitat assessment of the Broad-headed Skink (Plestiodon laticeps) and the associated squamate community in eastern Kansas". Transactions of the Kansas Academy of Science. 123 (1–2): 137. doi:10.1660/062.123.0111. S2CID 218890677.
  8. ^ Vitt, Laurie; Cooper, William (1986). "Tail loss, tail color, and predator escape in Eucemes (Lacertilia: Scincidae) age-specific differences in costs and benefits". Canadian Journal of Zoology (3 ed.). 64 (3): 583–592. doi:10.1139/z86-086.
  9. ^ Vitt, Laurie; Cooper, William (1986). "Foraging and Diet of a Diurnal Predator (Eumeces Laticeps) Feeding on Hidden Prey". Journal of Herpetology. 20 (3): 408–415. doi:10.2307/1564503. JSTOR 1564503.
  10. ^ Vitt, Laurie; Cooper, William (1986). "Foraging and Diet of a Diurnal Predator (Eumeces Laticeps) Feeding on Hidden Prey". Journal of Herpetology. 20 (3): 408–415. doi:10.2307/1564503. JSTOR 1564503.
  11. ^ Cooper, William (2000). "Tradeoffs Between Predation Risk and Feeding in a Lizard, the Broad-Headed Skink (Eumeces Laticeps)". Behaviour. 137 (9): 1175–1189. doi:10.1163/156853900502583. ISSN 0005-7959.
  12. ^ "Species Profile: Broadhead Skink." Savannah River Ecology Laboratory, University of Georgia. https://srelherp.uga.edu/lizards/eumlat.htm
  13. ^ Cooper, William; Vitt, Laurie (1993). Female mate choice of large male broad-headed skinks (4 ed.). Animal Behavior. ISBN 5-02-022461-8.
  14. ^ "Virginia Herpetological Society". www.virginiaherpetologicalsociety.com. Retrieved 2022-04-28.
  15. ^ Cooper, W. E., Garstka, W. R., & Vitt, L. J. (1986). Female Sex Pheromone in the Lizard Eumeces laticeps. Herpetologica, 42(3), 361–366. http://www.jstor.org/stable/3892314
  16. ^ Vitt, Laurie J.; Cooper, William E. (1985). "The Relationship between Reproduction and Lipid Cycling in the Skink Eumeces laticeps with Comments on Brooding Ecology". Herpetologica. 41 (4): 419–432. ISSN 0018-0831. JSTOR 3892111.
  17. ^ Conant, R., & J.T. Collins. 1998. A Field Guide to Reptiles & Amphibians: Eastern and Central North America, Third Edition. Peterson Field Guides. Houghton Mifflin. Boston and New York. 640 pp. ISBN 0-395-90452-8. (Eumeces laticeps, p. 263.)

Further readingEdit

  • Behler, J.L., and F.W. King. 1979. The Audubon Society Field Guide to North American Reptiles and Amphibians. Knopf. New York. 743 pp. (Eumeces laticeps, pp. 573–574 + Plates 424, 431.)
  • Conant, R. 1975. A Field Guide to Reptiles and Amphibians of Eastern North America, Second Edition. Houghton Mifflin. Boston. xviii + 429 pp. ISBN 0-395-19979-4 (hardcover), ISBN 0-395-19977-8 (paperback). (Eumeces laticeps, pp. 123–124, Figures 26-27 + Plate 19 + Map 76.)
  • Schneider, J.G. 1801. Historiae Amphibiorum naturalis et literariae continens...Scincos... Frommann. Jena. vi + 364 pp. + Plates I.- II. (Scincus laticeps, pp. 189–190.)
  • Smith, H.M., and E.D. Brodie, Jr. 1982. Reptiles of North America: A Guide to Field Identification. Golden Press. New York. 240 pp. ISBN 0-307-13666-3. (Eumeces laticeps, pp. 76–77.)

External linksEdit