HOME

TheInfoList



OR:

''Taurotragus'' is a genus of large
antelope The term antelope is used to refer to many species of even-toed ruminant that are indigenous to various regions in Africa and Eurasia. Antelope comprise a wastebasket taxon defined as any of numerous Old World grazing and browsing hoofed mamm ...
s of the African
savanna A savanna or savannah is a mixed woodland- grassland (i.e. grassy woodland) ecosystem characterised by the trees being sufficiently widely spaced so that the canopy does not close. The open canopy allows sufficient light to reach the ground ...
, commonly known as elands. It contains two species: the
common eland The common eland (''Taurotragus oryx''), also known as the southern eland or eland antelope, is a savannah and plains antelope found in East and Southern Africa. It is a species of the family Bovidae and genus '' Taurotragus''. An adult male is ...
''T. oryx'' and the
giant eland The giant eland (''Taurotragus derbianus''), also known as the Lord Derby eland and greater eland, is an open-forest and savanna antelope. A species of the family Bovidae and genus ''Taurotragus'', it was described in 1847 by John Edward Gray. T ...
''T. derbianus''.


Taxonomy

''Taurotragus'' is a
genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...
of large African
antelope The term antelope is used to refer to many species of even-toed ruminant that are indigenous to various regions in Africa and Eurasia. Antelope comprise a wastebasket taxon defined as any of numerous Old World grazing and browsing hoofed mamm ...
s, placed under the
subfamily In biological classification, a subfamily (Latin: ', plural ') is an auxiliary (intermediate) taxonomic rank, next below family but more inclusive than genus Genus ( plural genera ) is a taxonomic rank used in the biological classifica ...
Bovinae Bovines (subfamily Bovinae) comprise a diverse group of 10 genera of medium to large-sized ungulates, including cattle, bison, African buffalo, water buffalos, and the four-horned and spiral-horned antelopes. The evolutionary relationship betwe ...
and
family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...
Bovidae The Bovidae comprise the biological family of cloven-hoofed, ruminant mammals that includes cattle, bison, buffalo, antelopes, and caprines. A member of this family is called a bovid. With 143 extant species and 300 known extinct species, t ...
. The genus authority is the German zoologist
Johann Andreas Wagner Johann Andreas Wagner (21 March 1797 – 17 December 1861) was a German palaeontologist, zoologist and archaeologist who wrote several important works on palaeontology. Career Wagner was a professor at the University of Munich, and curator ...
, who first mentioned it in the journal ''Die Säugthiere in Abbildungen nach der Natur, mit Beschreibungen'' in 1855. The name is composed of two
Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ...
words: ταῦρος (''taûros''), meaning a "bull" or "bullock", and τράγος (''trágos''), meaning a "male goat"—in reference to the tuft of hair that grows in the eland's ear which resembles a goat's beard. The genus consists of two species: ''Taurotragus'' is sometimes considered part of the genus ''
Tragelaphus ''Tragelaphus'' is a genus of medium- to large-sized, spiral- horned antelopes. It contains several species of bovines, all of which are relatively antelope-like. Species in this genus tend to be large in size and lightly built, and have long ne ...
'' on the basis of
molecular phylogenetics Molecular phylogenetics () is the branch of phylogeny that analyzes genetic, hereditary molecular differences, predominantly in DNA sequences, to gain information on an organism's evolutionary relationships. From these analyses, it is possible to ...
. Together with the bongo, giant eland and common eland are the only antelopes in the
tribe The term tribe is used in many different contexts to refer to a category of human social group. The predominant worldwide usage of the term in English is in the discipline of anthropology. This definition is contested, in part due to confl ...
''Tragelaphini'' (consisting of ''Taurotragus'' and ''Tragelaphus'') to be given a generic name other than ''Tragelaphus''. Although some authors, like Theodor Haltenorth, regarded the giant eland as
conspecific Biological specificity is the tendency of a characteristic such as a behavior or a biochemical variation to occur in a particular species. Biochemist Linus Pauling stated that "Biological specificity is the set of characteristics of living organis ...
with the common eland, they are generally considered two distinct species.


Genetics and evolution

The eland have 31 male
chromosome A chromosome is a long DNA molecule with part or all of the genetic material of an organism. In most chromosomes the very long thin DNA fibers are coated with packaging proteins; in eukaryotic cells the most important of these proteins ar ...
s and 32 female chromosomes. In a 2008
phylogenomic Phylogenomics is the intersection of the fields of evolution and genomics. The term has been used in multiple ways to refer to analysis that involves genome data and evolutionary reconstructions. It is a group of techniques within the larger fields ...
study of spiral-horned antelopes, chromosomal similarities were observed between
cattle Cattle (''Bos taurus'') are large, domesticated, cloven-hooved, herbivores. They are a prominent modern member of the subfamily Bovinae and the most widespread species of the genus '' Bos''. Adult females are referred to as cows and adult ...
(''Bos taurus'') and eight species of spiral-horned antelopes, namely:
nyala The lowland nyala or simply nyala (''Tragelaphus angasii'') is a spiral-horned antelope native to southern Africa. It is a species of the family Bovidae and genus ''Tragelaphus'', previously placed in genus ''Nyala''. It was first described in ...
(''Tragelaphus angasii''), lesser kudu (''T. imberbis''), bongo (''T. eurycerus''),
bushbuck The Cape bushbuck (''Tragelaphus sylvaticus'') is a common and a widespread species of antelope in sub-Saharan Africa.Wronski T, Moodley Y. (2009)Bushbuck, harnessed antelope or both? ''Gnusletter'', 28(1):18-19. Bushbuck are found in a wide ran ...
(''T. scriptus''),
greater kudu The greater kudu (''Tragelaphus strepsiceros'') is a woodland antelope found throughout eastern and southern Africa. Despite occupying such widespread territory, they are sparsely populated in most areas due to declining habitat, deforestation, ...
(''T. strepsiceros''),
sitatunga The sitatunga or marshbuck (''Tragelaphus spekii'') is a swamp-dwelling antelope found throughout central Africa, centering on the Democratic Republic of the Congo, the Republic of the Congo, Cameroon, parts of Southern Sudan, Equatorial Guinea ...
(''T. spekei''), giant eland and common eland. It was found that chromosomes involved in centric
fusion Fusion, or synthesis, is the process of combining two or more distinct entities into a new whole. Fusion may also refer to: Science and technology Physics *Nuclear fusion, multiple atomic nuclei combining to form one or more different atomic nucl ...
s in these species used a complete set of cattle painting probes generated by laser microdissection. The study confirmed the presence of the
chromosome translocation In genetics, chromosome translocation is a phenomenon that results in unusual rearrangement of chromosomes. This includes balanced and unbalanced translocation, with two main types: reciprocal-, and Robertsonian translocation. Reciprocal transl ...
known as
Robertsonian translocation Robertsonian translocation (ROB) is a chromosomal abnormality wherein a certain type of a chromosome becomes attached to another. It is the most common form of chromosomal translocation in humans, affecting 1 out of every 1,000 babies born. It doe ...
(1;29), a widespread evolutionary marker common to all known tragelaphid species. An accidental mating between a male giant eland and a female kudu produced a male offspring, but it was
azoospermic Azoospermia is the medical condition of a man whose semen contains no sperm. It is associated with male infertility, but many forms are amenable to medical treatment. In humans, azoospermia affects about 1% of the male population and may be seen ...
. Analysis showed that it completely lacked
germ cell Germ or germs may refer to: Science * Germ (microorganism), an informal word for a pathogen * Germ cell, cell that gives rise to the gametes of an organism that reproduces sexually * Germ layer, a primary layer of cells that forms during embr ...
s, which produce
gamete A gamete (; , ultimately ) is a haploid cell that fuses with another haploid cell during fertilization in organisms that reproduce sexually. Gametes are an organism's reproductive cells, also referred to as sex cells. In species that produce ...
s. Still, the hybrid had a strong male scent and exhibited male behaviour. Chromosomal examination showed that chromosomes 1, 3, 5, 9, and 11 differed from the parental
karyotype A karyotype is the general appearance of the complete set of metaphase chromosomes in the cells of a species or in an individual organism, mainly including their sizes, numbers, and shapes. Karyotyping is the process by which a karyotype is disce ...
s. Notable mixed inherited traits were pointed ears as the eland's, but a bit widened like kudu's. The tail was half the length of that of an eland, with a terminal tuft of hair as in kudu. Female elands can also act as
surrogates ''Surrogates'' is a 2009 American science fiction action film based on the 2005–2006 comic book series '' The Surrogates''. Directed by Jonathan Mostow, it stars Bruce Willis as Tom Greer, an FBI agent who ventures out into the real world to ...
for
bongos Bongos ( es, bongó) are an Afro-Cuban percussion instrument consisting of a pair of small open bottomed hand drums of different sizes. They are struck with both hands, most commonly in an eight-stroke pattern called ''martillo'' (hammer). The ...
. The bovid ancestors of the eland evolved approximately 20 million years ago in
Africa Africa is the world's second-largest and second-most populous continent, after Asia in both cases. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area ...
;
fossil A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...
s are found throughout Africa and
France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...
but the best record appears in sub-Saharan Africa. The first members of the tribe Tragelaphini appear 6 million years in the past during the
late Miocene The Late Miocene (also known as Upper Miocene) is a sub-epoch of the Miocene Epoch made up of two stages. The Tortonian and Messinian stages comprise the Late Miocene sub-epoch, which lasted from 11.63 Ma (million years ago) to 5.333 Ma. The ...
. An extinct ancestor of the common eland (''Taurotragus arkelli'') appears in the
Pleistocene The Pleistocene ( , often referred to as the ''Ice age'') is the geological Epoch (geology), epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was fina ...
in northern
Tanzania Tanzania (; ), officially the United Republic of Tanzania ( sw, Jamhuri ya Muungano wa Tanzania), is a country in East Africa within the African Great Lakes region. It borders Uganda to the north; Kenya to the northeast; Comoro Islands ...
and the first ''T. oryx'' fossil appears in the
Holocene The Holocene ( ) is the current geological epoch. It began approximately 11,650 cal years Before Present (), after the Last Glacial Period, which concluded with the Holocene glacial retreat. The Holocene and the preceding Pleistocene togeth ...
in
Algeria ) , image_map = Algeria (centered orthographic projection).svg , map_caption = , image_map2 = , capital = Algiers , coordinates = , largest_city = capital , relig ...
. Previous genetic studies of African
savanna A savanna or savannah is a mixed woodland- grassland (i.e. grassy woodland) ecosystem characterised by the trees being sufficiently widely spaced so that the canopy does not close. The open canopy allows sufficient light to reach the ground ...
ungulate Ungulates ( ) are members of the diverse clade Ungulata which primarily consists of large mammals with hooves. These include odd-toed ungulates such as horses, rhinoceroses, and tapirs; and even-toed ungulates such as cattle, pigs, giraffes, ...
s revealed the presence of a long-standing
Pleistocene The Pleistocene ( , often referred to as the ''Ice age'') is the geological Epoch (geology), epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was fina ...
refugium in eastern and southern Africa, which also includes the giant eland. The common eland and giant eland have been estimated to have diverged about 1.6 million years ago.


Differences between species

Both the species of eland are large spiral-
horned A horn is a permanent pointed projection on the head of various animals that consists of a covering of keratin and other proteins surrounding a core of live bone. Horns are distinct from antlers, which are not permanent. In mammals, true ho ...
antelopes. Though the giant eland broadly overlaps in size with the common eland, the former is somewhat larger on average than the latter. In fact, the giant eland is the largest species of antelope in the world. Eland are
sexually dimorphic Sexual dimorphism is the condition where the sexes of the same animal and/or plant species exhibit different morphological characteristics, particularly characteristics not directly involved in reproduction. The condition occurs in most ani ...
, as the females are smaller than males. The two eland species are nearly similar in height, ranging from . In both species, males typically weigh while females weigh . The coat of the common eland is tan for females, and darker with a bluish tinge for males. The giant eland is reddish-brown to chestnut. The coat of the common eland varies geographically; the eland in southern Africa lack the distinctive markings (torso stripes, markings on legs, dark garters and a spinal crest) present in those from the northern half of the continent. Similarly, the giant eland displays 8 to 12 well-defined vertical white torso stripes. In both species the coat of the males darken with age. According to zoologist Jakob Bro-Jørgensen, the colour of the male's coat can reflect the levels of
androgens An androgen (from Greek ''andr-'', the stem of the word meaning "man") is any natural or synthetic steroid hormone that regulates the development and maintenance of male characteristics in vertebrates by binding to androgen receptors. This in ...
(male sex hormones), which are highest during rutting.


References

{{Taxonbar, from=Q840041 Bovines Taxa named by Johann Andreas Wagner Mammal genera