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Caretta caretta

(Loggerhead)

Overview

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Endangered

Threat status

Interesting Facts

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Common Names

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Click on the language to view common names.

Common Names in English:

Loggerhead, Loggerhead Sea Turtle, Loggerhead Turtle

Common Names in French:

Caouanne, Tortue Caouanne

Common Names in German:

Unechte Karettschildkrote

Common Names in Spanish:

Cayuma, Tortuga Boba, Tortuga-Marina Caguama

Description

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Physical Description

Species Caretta caretta

Loggerheads are primarily reddish-brown in coloration and have large heads with powerful jaws . They also often have barnacles and other organisms attatched to their shell . Males differ from females in having narrower shells and longer/thicker tails. Young Loggerheads have a more brownish colored carpace and a tan plastron.

This species is the most frequently encountered marine turtle along the coast of eastern North America.

Color:

The brown or reddish brown color is the easiest aid in identifying Loggerheads

Size/Age/Growth

This is the largest hard-shelled turtle in the world, exceeded in size only by the Leatherback Sea Turtle. The record carapace length for a Loggerhead is 2.13 m (83.1 in) but the average is 85 - 100 cm (33 - 39 in). The average weight is from 77 - 159 kg (170 - 350 lbs ), but the maximum recorded weight for this species is 545 kg (1199 lbs).

Habitat

This marine turtle generally inhabits open waters just off shore but occasionally enters the brackish waters of bays , lagoons , sounds , salt marshes, and the mouthes of large creeks and rivers . After hatching , young Loggerheads of eastern North America migrate to the sargassum beds of the western Atlantic Ocean where they find food and cover in the floating beds of seaweed.

Typically found in the intertidal zone at the water's edge at a mean distance from sea level of 29 meters (94 feet).[1]

Ecology: Terrestrial nest sites[2].

Biology

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Diet

These marine turtles are omnivorous and feed on algae, sea grasses, sponges, jellyfish , squid, mollusks, bivalves , shrimp, crabs, and fish.

Reproduction

Mating occurs in open waters as females move through territories of resident males from late March to June. Females lay 52 - 159 eggs from mid-May to late August. Nest regularly along the coast of the southeastern U.S., ranging as far north as Maryland and New Jersey. Nesting occurs at night when females come ashore and dig nesting cavities above the high water mark on the seaward side of dune fronts. Incubation takes 49 - 76 days, but averages between 60 - 65 days. Hatchlings emerge from the nest at night and immediately crawl toward the ocean. Hatchlings average from 33.5 - 52 mm (1.3 - 2 in) in carapace length . Females reproduce, at most, only every other year, and will lay from 1 - 3 clutches of eggs in a season . Nesting has been reported as far north as New Jersey, but the greatest number of nesting females come ashore on barrier islands and mainland beaches from North Carolina south to Florida. Females will return to the same beach to nest throughout their lifetime. The estimated life span of wild adults is 47 - 62 years.

Migration

As the turtles mature , they make long distance migrations to feeding grounds . This species has been recorded migrating up to 11,155 km (6,933 mi ) across the Pacific Ocean and up to 6,900 km (4,285 mi) in the Atlantic Ocean.

Taxonomy

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Synonyms

Caouana elongata Gray 1844 • Caretta caretta — Cogger 2000: 178 • Caretta caretta — Conant & Collins 1991: 76 • Caretta caretta — Engelmann Et Al 1993 • Caretta caretta — Glaw & Vences 1994: 229 • Caretta caretta — Stebbins 1985: 105 • Caretta caretta — Stejneger 1904 • Chelonia caouana DumÉril & Bibron 1835: 552 • Chelonia caretta Dyce 1861: 351 • Chelonia multiscutata Kuhl 1820 ? • Testudo caouana LACÉPÈDE 1788< /i> (Nom. Subst. Pro T. Caretta L.) • Testudo carettaTestudo caretta Linnaeus 1758: 197 • Testudo corianna GRAY 1831< /i> (Ex Errore) • Testudo nasicornis LacÉpÈde 1788

Notes

Name Status: Accepted Name .

Comment: Holotype: Unknown FRITZ (1995) reports hybrids between Caretta caretta and Eretmochelys imbricata. BARBER et al. (2003) confirmed natural hybridization between a Kemp’s ridley (Lepidochelys kempii) and loggerhead sea turtle (Caretta caretta) by molecular analysis.

Similar Species

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The Atlantic Ridley is smaller, and has an almost circular olive-green carapace. It has four scutes along the bridge of the shell. In the Hawksbill and Green Turtle the first costal scute does not touch the nuchal scute.

Members of the genus Caretta

ZipcodeZoo has pages for 1 species and subspecies in this genus:

C. caretta (Loggerhead)

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal February 27, 2008:

Identifiers

Footnotes

  1. Standard Deviation = 44.810 based on 141,287 observations. Terrestrial altitude and ocean depth information for each observation from British Oceanographic Data Centre. [back]
  2. Marine Turtle Specialist Group 1996. Caretta caretta. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. <www.iucnredlist.org>. Downloaded on 31 January 2012. [back]
Last Revised: 2012-07-14