Eretmochelys imbricata   (Linnaeus,  1766) (Turtle)
Organism information awaits expert curation
Taxonomy
Kingdom:Animalia
Phylum:Chordata
Class: Reptilia
Order:Testudines
Family:Cheloniidae

Image copyrights: Zubi

Description
Weight (adult): 150 kg

Carapace length: 80-100 cm

Carapace shape: Oval, strongly serrated posterior margin, thick imbricatescutes.

Color: The adults are marbled yellow and dark brown above, with a yellow plastron; whereas the young are brown and blackish below.

Costal scutes: 4 pairs (ragged posterior border)

Head shape: Narrow, straight bird like beak

Prefrontal scales: 2 pairs

Limbs: Two claws on each flipper

Plastron: Light Yellow to white

The species may be identified by the strongly overlapping shields of the carapace. It overlaps with Green Turtle is so far as the presence of four costal shields are concerned. However, it differs from the latter due to presence of two prefrontal shields on the head. The head is strong and narrow with strongly hooked jaws. Also, the flippers have a pair of claw each. The posterior margin of carapace is strongly serrated.
Each large individual yields about 7 kg of tortoise shell.

Nesting is perennial with peak in monsoon. The nest on an average is 40 cm deep and the clutch size is 100 eggs.

Clutches per season: 3-5

Clutch size: 120- 150 (up to 180)

Egg size: approx 3.5 cm in diameter


Synonym (s)
Caretta beisa Lesson, 1835
Caretta rostrata Girard, 1858
Caretta squamata Girard, 1858
Chelone imbricata Boulenger, 1889
Chelonia pseudo-midas Lesson, 1834
Chelonia radiata Cuvier, 1829
Eretmochelys squamata Agassiz, 1857
Onychochelys kraussi Gray, 1873
Testudo imbricata Linnaeus, 1766

Common Name (s)
• Hawksbill Turtle (English)
• Aamai
• Hawksbill (English)
Economic Importance and Threats
Importance:  Commercial, Dangers
(This species supports a small cottage industry, where small fancy articles from “tortoise shell” are made. These turtles are caught for scutes which is a raw material for fancy articles.
Poisoning through hawksbill bite is common in Indian region.)
Threats:  Anthropogenic
(The scutes are removed from the live turtle, in the vain belief that new one will regenerate. )

Ecology
Habitat:  Reef Associated
Prey:  Fish and sponges.
IUCN Status:  Critically Endangered

Biogeography


• Andaman and Nicobar Islands (Lat: 10) (Long: 93) INDIA
• Andaman and Nicobar Islands, Andaman Islands (Lat: 11.12) (Long: 92.82) INDIA
• Andaman and Nicobar Islands (Lat: 12.53) (Long: 92.82) INDIA
• Tamil Nadu, Gulf of Mannar INDIA
• Tamil Nadu, Chennai INDIA
• Lakshadweep INDIA
• Andaman and Nicobar Islands INDIA
• Orissa, Bhitarkanika INDIA
• Palk Bay INDIA
• Kerala, Vizhinjam (Lat: 8.36) (Long: 76.98) INDIA (Record: 1994–2002)
• INDIA
• Kerala, Vizhinjam (Lat: 8.37) (Long: 76.95) INDIA

Literature Source(s)
  • (2001) Sanctuary Asia natural history species: Species checklist: Reptiles Sanctuary Asia Sanctuary Magazine Available at - http://www.sanctuaryasia.com/resources/speciechklist/reptile.php
  • Alfred, JRB; Das, AK and Sanyal, AK (Eds.) (1998) Faunal diversity in India ZSI, Calcutta 1-497 Available at - NCL, Pune
  • Sharma, RC (1998) Fauna of India Reptilia Testudines and Crocodilians ZSI, Kolkata 1 Available at - NCL, Pune
  • Tikader, BK and Das, AK (1985) Glimpses of animal life of Andaman and Nicobar Islands ZSI, Kolkata 1-170 Available at - NCL, Pune
  • (1994) The red data book on Indian animals Vertebrata part 1 ZSI, Kolkata 1-534 Available at - NCL, Pune
  • Tikader, BK (1983) Threatened animals of India ZSI 1-285 Available at - NCL, Pune
  • Molur, S and Walker, S (1998) Reptiles of India. Report summary 1998 Zoos' Print Journal Zoo Outreach Organisation, Coimbatore 13(7) 1 Available at - NCL, Pune
  • Index to Organism Names (ION) Available at - http://www.organismnames.com/
  • Yasuda, T and Arai, N (2005) Fine-scale tracking of marine turtles using GPS-Argos PTTs Zoological Science (Tokyo) 72(5) Available at - Zoological Records
  • Hussain, SM Brief report on biodiversity in the coastal areas of Pakistan p 113
  • Hasbun, CR; Lawrence, AJ; Samour, JH and AlGhais, SM (2000) Preliminary observation on the biology of green turtles, Chelonia mydas, from the United Arab Emirates Aquatic conservation: Marine and Freshwater Ecosystems 10 311-322 Available at - NCL, Pune
  • Venkataraman, K and Milton, MCJ (2003) Marine turtles of India ZSI, Calcutta 87 pp
  • (2003) IUCN Red list of threatened species Available at - http://www.iucnredlist.org/
  • Das, HS (2003) Head-starting of sea turtles: Is it a viable conservation and management tool? Re-introduction News 23 42-44 Available at - ZOOR:ZOOR14009051432
  • Loughland, RA (2001) Survey of marine turtle nest sites in the UAE Qatar University Science Journal 19 257-262 Available at - ZOOR:ZOOR13800015416
  • Baldwin, R (1995) Marine turtles of the UAE Tribulus 5(2) Available at - ZOOR:ZOOR13500044726
  • Baldwin, R (1996) Marine reptiles Natural Emirates: wildlife and environment of the United Arab Emirates Trident Press 135-148 Available at - ZOOR:ZOOR13500003184
  • Brown, B (1990) Reptile recorder's report for 1989 13 Available at - ZOOR:ZOOR12800029432
  • Lim, KKP (1994) Fauna: Vertebrates, reptiles The Singapore Red Data Book: Threatened plants and animals of Singapore 213-227, p 331 Available at - Zoological Records
  • Jeanne, MA; John, C; Tony, J; Roselle, C; Anna, L and Brian, B (2003) Growth rates of immature hawksbills (Eretmochelys imbricata) at Aldabra Atoll, Seychelles (Western Indian Ocean) NOAA Technical Memorandum NMFS-SEFSC 503 247-248 Available at - Zoological Records
  • Jonathan, HDR; Martin, CJ and Graeme, HC (2003) Habitat utilization by juvenile hawksbill turtles (Eretmochelys imbricata, Linnaeus, 1766) around a shallow water coral reef Journal of Natural History 37(10) 1269-1280 Available at - Zoological Records
  • Jeanne, MA and George, BH (2000) Post nesting migrations of hawksbill turtles in the granitic Seychelles and implications for conservation NOAA Technical Memorandum NMFS-SEFSC 443 22-26 Available at - Zoological Records
  • Mortimer, JA (2000) Conservation of hawksbill turtles (Eretmochelys imbricata) in Republic of Seychelles Sea turtles of the Indo Pacific: Research management and conservation. Proceedings of the second ASEAN symposium and workshop on sea turtle biology and conservation ASEAN Academic Press, London 176-185 Available at - Zoological Records
  • Mortimer, JA and Broderick, D (1999) Population genetic structure and developmental migrations of sea turtles in the Chagos Archipelago and adjacent regions inferred from mtDNA sequence variation Linnean Society Occasional Publication 2 185-194 Available at - Zoological Records
  • Osamu, A; Naofumi, A; Hiroko, K; Toshinao, O; DiazFernandez, R; Yoshiyuki, B and Matheus, H (1999) Genetic diversity of the hawksbill turtle in the Indo-Pacific and Caribbean regions Chelonian Conservation and Biology 3(2) 362-367 Available at - Zoological Records
  • Meylan, AB and Donnelly, M (1999) Status justification for listing the hawksbill turtle (Eretmochelys imbricata) as critically endangered on the 1996 IUCN Red List of threatened animals Chelonian Conservation and Biology 3(2) 200-224 Available at - Zoological Records
  • Walczak, PS (1979) The status of marine turtles in the waters of the Yemen Arab Republic British Journal of Herpetology 5(12) 851-583 Available at - Zoological Records(Yemen marine)
  • Jeanne, MA and Roby, B (1994) Individual and age-dependent variations in clutch frequency among hawksbill turtles at Cousin Island, Seychelles: 1973-1992 NOAA Technical Memorandum NMFS-SEFSC 351 94-96 Available at - Zoological Records
  • Mortimer, JA and Bresson, R (1994) The hawksbill nesting population at Cousin Island, Republic of Seychelles: 1971 to 92 NOAA Technical memorandum NMFS SEFSC 341 115-117 Available at - Zoological Records
  • Meyer, CA (1991) Burial experiments with marine turtle carcasses and their paleoecological significance Palaios 6(1) 89-96 Available at - Zoological Records
  • Visser, G (1988) The Seychelles 2 Dieren 4(5) 144-148 Available at - Zoological Records
  • Mortimer, JA (1987) Monitoring turtles in the Seychelles Swara 10(3) 26 Available at - Zoological Records
  • Frazier, J (1984) Marine turtles in the Seychelles and adjacent territories Monographiae Biologicae 55 417-468 Available at - Zoological Records
  • Disi, AM (1998) Morphometrics, distribution and ecology of chelonians in Jordan (Reptilia: Testudines) Faunistische Abhandlungen (Dresden) 21 31-41 Available at - ZOOR:ZOOR13500034699
  • AlMerghani, M; Miller, JD; Pilcher, NJ and AlMansi, A (2000) The green and hawksbill turtles in the kingdom of Saudi Arabia: Synopsis of nesting studies 1986 to 1997 Fauna of Arabia 18 369-384 Available at - ZOOR13700047154
  • AlMerghani, M; Miller, JD; AlMansi, A; Khushaim, O and Pilcher, JN (1996) The marine turtles of the Arabian Gulf. NCWCD studies 1991 to 1994 A marine wildlife sanctuary for the Arabian Gulf: Environmental research and conservation following the 1991 Gulf War oil spill 359 pp Available at - ZOOR13500030969
  • Anonymous (1991) Resource maps. Prepared by: Meteorological and Environmental Protection Administration, Kingdom of Saudi Arabia The Gulf War oil spills: The ICBP survey of the Saudi Arabian Gulf coast, March 1991. A report to the International Council for Bird Preservation and the National Commission on Wildlife Conservation and Development, Kingdom of Saudi Arabia. Available at - ZOOR13100021163
  • Islam, MZ (2002) Threats to sea turtles in St. Martins Island, Bangladesh Kachhapa Newsletter 6 Available at - Zoological Records (Bangladesh)
  • Zahirul, IM (2002) Marine turtle nesting at St. Martins Island, Bangladesh Marine Turtle Newsletter 96 19-21 Available at - Zoological Records, Bangladesh
  • Borkar, M (2005) Marine mammals, turtles and crocodiles: A field manual NIO, Goa 63 pp Available at - NIO
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • Starfish Available at - http://www.starfish.ch/
  • Untawale, AG; Dhargalkar, VK and Deshmukhe, GV (2000) Prioritization of potential sites for marine biodiversity conservation in India Setting biodiversity conservation priorities for India: Summary of the findings and conclusions of the biodiversity conservation prioritization project World Wide Fund for Nature - India, New Delhi (India) Available at - http://drs.nio.org/drs/bitstream/2264/1614/2/Setting_Biodiversity_Conserv_Priorities_India_2000_1_104.pdf
  • Venkataraman, K and Wafar, M (2005) Coastal and marine biodiversity of India Indian Journal of Marine Sciences 34(1) 57-75 Available at - NIO, Goa
  • Dr. Ramesh, R; Dr. Nammalwar, P and Dr. Gowri, VS (2008) Database on coastal information of Tamil Nadu Report Submitted to Environmental Information System (ENVIS) Centre, Department of Environment, Government of Tamil Nadu Institute for Ocean Management, Anna University, Chennai, Tamil Nadu. Available at - http://tnenvis.nic.in/PDF/coastal%20data.pdf
  • Chadha, S and Sekar, KC (1999) Bhitarkanika:myth and reality Nataraj publishers, Dehra Dun Available at - NIO, Goa
  • Dr. Kumaraguru, AK (2000) Studies on socioeconomics of Coral Reef resource users in the Gulf of Mannar coast, South India Centre for Marine and Coastal studies School of Energy, Environment and Natural Resources Madurai Kamaraj University, Madurai, India Available at - http://planningcommission.nic.in/reports/sereport/ser/stdy_coral.pdf
  • Murugan, A (2005) Sea turtles in and around Tuticorin coast, Tamil Nadu: facts and problems Proceedings of the National Seminar on Reef Ecosystem Remediation SDMRI Special Research Publication No.9 250-252 Available at - http://www.sdmri.org/reports/proceedings%202005%20-%20sdmri.pdf
  • Krishnapillai, S (2005) Distribution and status of sea turtles along Trivandrum coast, south Kerala Proceedings of the National Seminar on Reef Ecosystem Remediation SDMRI Special Research Publication No.9 253-255 Available at - http://www.sdmri.org/reports/proceedings%202005%20-%20sdmri.pdf
  • Bhaskar, S and Whitaker, R (1983) Sea turtle resources in the Andamans Mariculture potential of Andaman and Nicobar Islands-An indicative survey Bulletin of Central Marine Fisheries Institute CMFRI, Cochin 34 94-97 Available at - http://eprints.cmfri.org.in/809/1/Bulletin_No_34.pdf
  • Pillai, PKM and Augustine, SK (2000) A code list of common marine living resources of the Indian seas CMFRI Special Publication No.12 CMFRI 1-115 Available at - eprints.cmfri.org.in/3975/1/Special_Publication_No_12_Revised.pdf
  • Kannan, P; Rajagopalan, M (2007) Size composition and morphometry of incidentally captured sea turtles at Vizhinjam, South-west coast of India Journal of the Bombay Natural History Society 104(3) 288-297 Available at - NIO, Goa
  • Shenoy S, Berlie T and Shanker K (2011) Sea Turtles of India A Comprehensive Field Guide to Research, Monitoring and Conservation Dakshin Foundation and MCB Trust 148pp Available at - NIO

Page last updated on:2012-11-05

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