The angonoka tortoise is one of the most endangered tortoises in the world, with a population of about 100 animals.
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Common Names in English:
Angonoka, Angonoka Radiated Tortoise, Angulated Tortoise, Madagascar Angulated Tortoise, Malagasy Angulated Tortoise, Ploughshare Tortoise, Plowshare Tortoise
Common Names in German:
Species Geochelone yniphora
Carapace to 17 inches, highly arched. Carapace uniformly light brown
with darker wedges on costal scutes. Gular
scute single, elongate
up toward the neck, beak-like. Radiated
markings poorly developed; instead with rhomboidal
against a dark background. Median
anterior hornlike plastral projection.
Males larger than females. Pronounced concavity in posterior region of plastron and distinct outward flaring of rear marginals . Enlarged epiplastron.
In hot- tropical , semi-humid zone, with xeric, mixed scrub/bamboo secondary growth . Live in "islands" of xeric scrub forest in exposed rocky or coastal areas or in savannah grassland. Favor mixed habitats with open herbaceous zones for foraging and dense thickets for protection and cover . Inactive during cool, dry season (May to October). Does not dig burrows. Seeks protection in thickets and seeks shelter in surface litter . Forages during morning and late afternoon.
Herbivorous, Forages during morning and late afternoon.
Similar to that of Geochelone
radiata . Males engage in combat; use their gular
ram, push, and occasionally overturn
each other. Courtship
occurs October to February, peaking in November and December.
Begins with sniffing, although trailing and circling may be initiated by the male without initial sniffing. Male circles female 5 to 3O times; he may bump her as he passes in front. Males may or may not bite head and forelimbs of female. Rams and pushes female and pushes his enlarged epiplastron under female's carapace into soft parts (legs or head socket). Then he hooks (lifts ) female, which frequently leads to overturning. Female extends her rear legs to elevate posterior shell , "presenting". Vocalizations consist of a series of single, unbroken calls .
In cases where female was uncooperative, intervention by keepers in the form of spraying female with fine water spray usually resulted in her "presenting".
Dig flask-shaped nests in moist soil. Hole depth averages 4.3 inches (I 1. I cm), range 3.9"to5.4"(10-13.6cm). Basal width averages 4.5 inches(11.6cm), range 4.2" to 5"(10.8-12.7 cm). Nesting occurs typically in the late morning. Test holes maybe constructed for a few days before the final site is chosen.
Rear feet are used to position the eggs within the nest cavity. One female observed to seem to keep the eggs as far from each other as possible within the cavity . Eggs are covered with soil and firmly packed. 4 to 5 clutches are laid, one month apart each. Clutch size is 3 to 6 eggs, mean 4.2 eggs. Eggs are white, nearly spherical , 1.65" to 1.85" mean diameter (42 to 47 mm) and weigh 1.4 to 1.75 ounces (40.5 to 50g). Incubation 168 to 296 days.
- Whittaker & Margulis,1978
- C. Linnaeus, 1758
- (Hatschek, 1888) Cavalier-Smith, 1983
- Grobben, 1908
- (Haeckel, 1874) Cavalier-Smith, 1998
- Bateson, 1885
- Cuvier, 1812
- Jawed Vertebrates
- Superclass: Tetrapoda () - Goodrich, 1930
- Infraphylum: Gnathostomata () - auct. - Jawed Vertebrates
- Subphylum: Vertebrata () - Cuvier, 1812 - Vertebrates
- Phylum: Chordata () - Bateson, 1885 - Chordates
- Infrakingdom: Chordonia () - (Haeckel, 1874) Cavalier-Smith, 1998
- Branch: Deuterostomia () - Grobben, 1908
- Subkingdom: Bilateria () - (Hatschek, 1888) Cavalier-Smith, 1983
- Kingdom: Animalia () - C. Linnaeus, 1758 - animals
Asterochelys yniphora Obst 1985 • Astrochelys yniphora GERLACH< /i> (Pers. Comm.) • Geochelone Yniphora • Testudo hyniphora VAILLANT & GRANDIDIER 1910< /i> (Nomen Subst. Pro T. Yniphora) • Testudo yniphora Vaillant 1885: 440
Name Status: Accepted Name . Latest taxonomic scrutiny: Uetz P.
Members of the genus Geochelone
ZipcodeZoo has pages for 24 species and subspecies in this genus:
G. carbonaria (Red-Footed Tortoise) · G. chilensis (Argentine Tortoise) · G. chilensis chilensis (Southern Wood Tortoise) · G. denticulata (Brazilian Giant Tortoise) · G. elegans (Indian Star Tortoise) · G. elephantophus (Galapagos Giant Tortoise) · G. gigantea (Aldabra Giant Tortoise) · G. nigra (Abingdon Island Tortoise) · G. nigra becki (Volcan Wolf Tortoise) · G. nigra chathamensis (Chatham Island Tortoise) · G. nigra darwini (James Island Tortoise) · G. nigra ephippium (Duncan Island Tortoise) · G. nigra galapagoensis (Charles Island Tortoise) · G. nigra guntheri (Sierra Negra Tortoise) · G. nigra hoodensis (Hood Island Tortoise) · G. nigra microphyes (Volcan Darwin Tortoise) · G. nigra porteri (Indefatigable Island Tortoise) · G. nigra vandenburghi (Volcan Alcedo Tortoise) · G. nigra vicina (Iguana Cove Tortoise) · G. pardalis (Leopard Tortoise) · G. platynota (Burmese Starred Tortoise) · G. radiata (Radiated Tortoise) · G. sulcata (African Spurred Tortoise) · G. yniphora (Angonoka)
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- Honolulu Zoo
- Tortoise & Freshwater Turtle Specialist Group 1996. In IUCN 2008. 2008 IUCN Red List of Threatened Species. IUCNRedList.org. Downloaded July 18, 2008.
- Tortoise and Freshwater Turtle Specialist Group 1996. Geochelone yniphora. In: IUCN 2006. 2006 IUCN Red List of Threatened Species. www.iucnredlist.org . Downloaded on 20 October 2006.