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Afrosoricida

Order of mammals From Wikipedia, the free encyclopedia

Afrosoricida

The clade Afrosoricida (a Latin-Greek compound name which means "looking like African shrews") contains the golden moles of Southern Africa, the otter shrews of equatorial Africa and the tenrecs of Madagascar. These three groups of small mammals were for most of the 19th and 20th centuries regarded as a part of the Insectivora or Lipotyphla, but both of those groups, as traditionally used, are polyphyletic.

Quick Facts Scientific classification, Subclades ...
Afrosoricida
Temporal range: Eocene–Recent
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Lesser hedgehog tenrec (Echinops telfairi)
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Grant's golden mole (Eremitalpa granti)
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Mirorder: Afroinsectivora
Order: Afrosoricida
Stanhope MJ, Waddell VG, Madsen O, de Jong W, Hedges SB, Cleven G, Kao D, Springer MS, 1998
Subclades

†Afrodon
 †Dilambdogale
 †Protenrec
 †Todralestes
 †Widanelfarasia
 ?†Adapisoriculidae
 Chrysochloridea
 Tenrecomorpha

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Naming

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Perspective

Some biologists use Tenrecoidea or Tenrecomorpha as the name for the tenrec-golden mole clade and regard Afrosoricida as a junior synonym (even though the rules of the ICZN do not apply above the Linnean rank of family). This is based on the principles of Simpson,[1] summarized by Asher & Helgen[2] to mean that "priority and stability should comprise the overriding principles by which new, high-level taxa are named. Established names for any given clade should not be altered unless the name with precedent unambiguously threatens stability." When "Afrosoricida" was first named in 1998, Afrosorex was a subgenus of Crocidura and McDowell[3] had used the name Tenrecoidea for the same clade of golden moles and tenrecs. Gary Bronner and Paula Jenkins referred to "Afrosoricida" in their chapter in Wilson & Reeder[4] as "... inappropriate since this clade does not include soricids, and could lead to confusion with the soricid subgenus Afrosorex" but still kept it due to their perception that the name was "entrenched in the recent literature" and because of the admittedly confusing history of terms like Tenrecoidea and Tenrecomorpha.[5] Asher & Helgen[2] presented their views on the appropriateness of these and other high-level taxa, including a response[6] to Hedges,[7] who supported keeping "Afrosoricida".

Biology

As a rule, tenrecs and otter shrews tend to be small animals varying from 4 cm to 39 cm in length. There is no pronounced body type since they have evolved to occupy a number of small-bodied, faunivorous niches in Madagascar (tenrecines) and mainland Africa (potamogalines). However, certain species bear some ecological similarity to hedgehogs, soricid shrews, or miniature otters. Their coat can vary from smooth to spiny and the coloration of the fur can also vary from brown, gray, to other hues (see for example photos on the ASM library[8]). Most species are also nocturnal and have poor eyesight. Their whiskers are rather sensitive and they can detect very minute vibrations in the ground to locate their prey.

Unusual among placentals, afrosoricids have a cloaca, which is the rear orifice that functions as the opening for the urinary, digestive, and reproductive tracts.[9]

Phylogeny

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Perspective

Traditionally, these two families were grouped with the hedgehogs, shrews and moles in the Lipotyphla. However, there have always been minority opinions suggesting that Tenrecoidea, or at least the golden moles, are not true lipotyphlans. For example, Robert Broom wrote in 1916[10] that "examination of the skull confirms ... that Chrysochloris is not a near ally of Centetes" (i.e., Tenrec ecaudatus) "and that it is not an Insectivore". These opinions are now supported by many genetic studies indicating an association between tenrecoids and various other African mammals in the Afrotheria.[11][12][13][14] Tenrecs and golden moles are sometimes considered part of the Afroinsectiphilia, a clade within Afrotheria.

Cladogram of living Afrosoricida

The generally accepted cladogram of living Afrosoricida is:[13][14]

Afrosoricida

Species

See also

References

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