Bell's hinge-back tortoise (''Kinixys belliana''), also known commonly as Bell's eastern hinged tortoise, is a

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

tortoise Tortoises ( ) are reptiles of the family Testudinidae of the order Testudines (Latin for "tortoise"). Like other turtles, tortoises have a shell to protect from predation and other threats. The shell in tortoises is generally hard, and like o ...

in the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Testudinidae Tortoises ( ) are reptiles of the family Testudinidae of the order Testudines (Latin for "tortoise"). Like other turtles, tortoises have a shell to protect from predation and other threats. The shell in tortoises is generally hard, and like ot ...

. The species is native to central

Africa Africa is the world's second-largest and second-most populous continent after Asia. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth's land area and 6% of its total surfac ...

. It has the hinge that characterizes all tortoises in the genus ''

Kinixys ''Kinixys'' is a genus of turtles in the Family (biology), family Testudinidae. The genus was erected by Thomas Bell (zoologist), Thomas Bell in 1827. The species in the genus ''Kinixys'' are native to Sub-Saharan Africa and Madagascar and common ...

''. There are no recognized

subspecies In Taxonomy (biology), biological classification, subspecies (: subspecies) is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (Morphology (biology), morpholog ...

Etymology

Both the

specific name Specific name may refer to: * in Database management systems, a system-assigned name that is unique within a particular database In taxonomy, either of these two meanings, each with its own set of rules: * Specific name (botany), the two-part (bino ...

, ''belliana'', and the common name are in honor of

English English usually refers to: * English language * English people English may also refer to: Culture, language and peoples * ''English'', an adjective for something of, from, or related to England * ''English'', an Amish ter ...

zoologist Zoology ( , ) is the scientific study of animals. Its studies include the structure, embryology, classification, habits, and distribution of all animals, both living and extinct, and how they interact with their ecosystems. Zoology is one ...

Thomas Bell.

Description

Bell's hinge-back tortoise is a medium-sized light brown tortoise. They can grow up to 22 cm. On the back of its shell, the tortoise has a 90 degree hinge which, when closed, can protect its rear legs and tail from predators. This broad band of flexible connective tissue is located between the 4th and 5th costals and the 7th and 8th peripherals in adults. The scutes on its slightly domed and elongated shell typically have a radiating pattern of dark patches, though these can fade. Adult males have a concave belly. Most Bell's hinge-backs have five claws on each forefoot.

Distribution and habitat

In its habitat, Bell's hinge-back tortoise favours tropical and sub-tropical

savannah A savanna or savannah is a mixed woodland-grassland (i.e. grassy woodland) biome and ecosystem characterised by the trees being sufficiently widely spaced so that the canopy does not close. The open canopy allows sufficient light to reach th ...

s of

sub-Saharan Africa Sub-Saharan Africa is the area and regions of the continent of Africa that lie south of the Sahara. These include Central Africa, East Africa, Southern Africa, and West Africa. Geopolitically, in addition to the list of sovereign states and ...

. It was traditionally considered to be the most common and widespread hinge-back tortoise, found throughout a large part of

such as in

Sudan Sudan, officially the Republic of the Sudan, is a country in Northeast Africa. It borders the Central African Republic to the southwest, Chad to the west, Libya to the northwest, Egypt to the north, the Red Sea to the east, Eritrea and Ethiopi ...

Tanzania Tanzania, officially the United Republic of Tanzania, is a country in East Africa within the African Great Lakes region. It is bordered by Uganda to the northwest; Kenya to the northeast; the Indian Ocean to the east; Mozambique and Malawi to t ...

, the

Democratic Republic of the Congo The Democratic Republic of the Congo (DRC), also known as the DR Congo, Congo-Kinshasa, or simply the Congo (the last ambiguously also referring to the neighbouring Republic of the Congo), is a country in Central Africa. By land area, it is t ...

and down to

southern Africa Southern Africa is the southernmost region of Africa. No definition is agreed upon, but some groupings include the United Nations geoscheme for Africa, United Nations geoscheme, the intergovernmental Southern African Development Community, and ...

. However, a revision of the species advocated by Kindler et al. (2012) restricted it only to the central African populations, ranging from

Angola Angola, officially the Republic of Angola, is a country on the west-Central Africa, central coast of Southern Africa. It is the second-largest Portuguese-speaking world, Portuguese-speaking (Lusophone) country in both total area and List of c ...

Burundi Burundi, officially the Republic of Burundi, is a landlocked country in East Africa. It is located in the Great Rift Valley at the junction between the African Great Lakes region and Southeast Africa, with a population of over 14 million peop ...

Diet

Bell's hinge-back tortoise is an omnivore, with a very varied diet consisting mainly of a range of different plants, but also including insects and other meat. It feeds on

vegetables Vegetables are edible parts of plants that are consumed by humans or other animals as food. This original meaning is still commonly used, and is applied to plants collectively to refer to all edible plant matter, including flowers, fruits, ...

twigs A twig is a thin, often short, branch of a tree or bush. The buds on the twig are an important diagnostic characteristic, as are the abscission scars where the leaves have fallen away. The color, texture, and patterning of the twig bark are ...

root In vascular plants, the roots are the plant organ, organs of a plant that are modified to provide anchorage for the plant and take in water and nutrients into the plant body, which allows plants to grow taller and faster. They are most often bel ...

leaves A leaf (: leaves) is a principal appendage of the stem of a vascular plant, usually borne laterally above ground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leaves, stem, ...

fruits In botany, a fruit is the seed-bearing structure in flowering plants (angiosperms) that is formed from the ovary after flowering. Fruits are the means by which angiosperms disseminate their seeds. Edible fruits in particular have long propaga ...

earthworms An earthworm is a soil-dwelling terrestrial animal, terrestrial invertebrate that belongs to the phylum Annelida. The term is the common name for the largest members of the class (biology), class (or subclass (biology), subclass, depending on ...

snails A snail is a shelled gastropod. The name is most often applied to land snails, terrestrial molluscs, terrestrial pulmonate gastropod molluscs. However, the common name ''snail'' is also used for most of the members of the molluscan class Gas ...

tadpoles A tadpole or polliwog (also spelled pollywog) is the larval stage in the biological life cycle of an amphibian. Most tadpoles are fully aquatic, though some species of amphibians have tadpoles that are terrestrial. Tadpoles have some fish-li ...

and other small invertebrates.

Threats and conservation

In its natural habitat, its predators are

leopards The leopard (''Panthera pardus'') is one of the five extant cat species in the genus ''Panthera''. It has a pale yellowish to dark golden fur with dark spots grouped in rosettes. Its body is slender and muscular reaching a length of with a ...

hawks Hawks are bird of prey, birds of prey of the family Accipitridae. They are very widely distributed and are found on all continents, except Antarctica. The subfamily Accipitrinae includes goshawks, sparrowhawks, sharp-shinned hawks, and othe ...

and

eagle Eagle is the common name for the golden eagle, bald eagle, and other birds of prey in the family of the Accipitridae. Eagles belong to several groups of Genus, genera, some of which are closely related. True eagles comprise the genus ''Aquila ( ...

s. Currently it is mainly threatened by widespread collection from the wild for the illegal international trade in the species. It is also collected by local peoples for food and human population growth in the area is putting pressure on the species. Human-induced fire is also a threat. Its shells are used as

musical instruments A musical instrument is a device created or adapted to make musical sounds. In principle, any object that produces sound can be considered a musical instrument—it is through purpose that the object becomes a musical instrument. A person who pl ...

by the priests of the Oroko and other peoples of southwestern Cameroon to accompany religious incantations. As of March 22, 2000, the

USDA The United States Department of Agriculture (USDA) is an United States federal executive departments, executive department of the Federal government of the United States, United States federal government that aims to meet the needs of commerc ...

has banned importation of the Bell's hinge-back tortoise,

leopard tortoise The leopard tortoise (''Stigmochelys pardalis'') is a large and attractively marked tortoise found in the savannas of eastern and southern Africa, from Sudan to the southern Cape Province. It is the only extant member of the genus ''Stigmochelys' ...

and the

African spurred tortoise The African spurred tortoise (''Centrochelys sulcata''), also called the sulcata tortoise, is an endangered species of tortoise inhabiting the southern edge of the Sahara, Sahara Desert, the Sahel, in Africa. It is the largest mainland species o ...

Subspecies

are currently recognized as being valid. Formerly the following subspecies were recognized: *''K. b. belliana'' – Bell's hinge-back *''K. b. domerguei'' – Madagascan hinge-back *''K. b. nogueyi'' – western hinge-back *''K. b. zombensis'' – southeastern hinge-back Kindler et al. (2012) raised the subspecies ''K. b. zombensis'' (which they considered a senior synonym of ''K. b. domerguei'') and ''K. b. nogueyi'' to the ranks of species, respectively ''

Kinixys zombensis ''Kinixys'' is a genus of turtles in the family Testudinidae. The genus was erected by Thomas Bell in 1827. The species in the genus ''Kinixys'' are native to Sub-Saharan Africa and Madagascar and commonly known as hinged tortoises or hinge-back ...

'' and ''

Kinixys nogueyi ''Kinixys'' is a genus of turtles in the Family (biology), family Testudinidae. The genus was erected by Thomas Bell (zoologist), Thomas Bell in 1827. The species in the genus ''Kinixys'' are native to Sub-Saharan Africa and Madagascar and common ...

''. ''K. b. domerguei'' is now treated as subspecies of ''Kinixys zombensis'' (i.e., ''Kinixys zombensis domerguei'').

Parasites of hinge-back tortoises

''Kinixys'' tortoises play host to a number of ectoparasites (external) and endoparasites (internal) A survey (by Alan Probert & Clive Humphreys) of mixed captive ''K. spekii'' and ''K. belliana'' (mostly ''K. spekii'') in Zimbabwe showed that ticks (Arachnida) and roundworms (Nematoda) of genera ''Angusticium'', ''Atractis'' and ''Tachygontria'' infect these tortoises. This has been reported by others as well. However, some of the tiny roundworms (photographed under SEM) are very likely new species and as yet remain undescribed.

References

*Smylie, A
''Kinixys'' (Hinged-Back Tortoises)
Gulf Coast Turtle and Tortoise Society. *Hingeback Central

;Bibliography * {{Taxonbar, from=Q1529918 Kinixys Turtles of Africa Reptiles of Angola Vertebrates of Burundi Reptiles of the Central African Republic Reptiles of the Democratic Republic of the Congo Vertebrates of Eritrea Reptiles of Ethiopia Reptiles of Kenya Vertebrates of Rwanda Reptiles of Somalia Reptiles of South Sudan Reptiles of Tanzania Reptiles of Uganda Reptiles described in 1831 Taxa named by John Edward Gray