Samiksha Jaiswal (Editor)

Acanthocercus atricollis

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Kingdom  Animalia
Suborder  Iguania
Phylum  Chordata
Rank  Species
Class  Reptilia
Family  Agamidae
Genus  Acanthocercus
Order  Scaled reptiles
Acanthocercus atricollis Nature Images by Arthur Tiutenko Acanthocercus atricollis Blue
Similar  Acanthocercus, Agama agama, Scaled reptiles, Agama aculeata, Laudakia

Acanthocercus atricollis arno t

The black-necked agama (Acanthocercus atricollis) is a species of tree agama that is native to East, Central and southern Africa. Its largest continuous range is in southeastern Africa, and it occurs at high densities in the Kruger National Park.


Acanthocercus atricollis Nature Images by Arthur Tiutenko Acanthocercus atricollis Blue

Acanthocercus atricollis


Acanthocercus atricollis Blacknecked Agama Acanthocercus atricollis iNaturalistorg

The sexes have a comparable snout-to-vent length (SVL) and have similar tail lengths. Mature males have somewhat larger heads than females, which is deemed to be an adaptation for intraspecific competition for territory. Females reach sexual maturity when about 96 mm long (SVL) and males from about 82 mm (SVL).


Acanthocercus atricollis Blacknecked Agama Acanthocercus atricollis iNaturalistorg

They form structured colonies with a dominant male, several females and juveniles. The males defend territories and engage in combat. Although mostly diurnal, they sometimes exhibit nocturnal activity. It adapts readily to the vicinity of human habitation. They are classic ambush foragers which spend only some 4% of their time moving. This involves an average of less than one movement in two minutes. When stationary, the adults position themselves on lateral branches (42% of the time), on tree trunks (35%), or occasionally on the ground (23%).


Acanthocercus atricollis httpsuploadwikimediaorgwikipediacommonsthu

They subsist on an insect diet, which consists mainly of orthopterans, beetles and ants. Their full diet encompasses various orders (10 recorded) of arthropods. They also eat millipedes, which other lizard taxa tend to avoid. Gut contents reveal many ants (92% of items) and some beetles (4%). A large volume of orthopterans is consumed (27%), followed by beetles (26%) and ants (18%). Juvenile diet (by volume) is dominated by ants, though beetles and orthopterans are also taken. Prey diversity and volumes fluctuate seasonally.


Acanthocercus atricollis Acanthocercus atricollis Wikipedia

Reproduction is seasonal. Testicular volume of males reaches a maximum during August to September (austral spring), and follicles of females become enlarged during August to December. Females lay a single clutch per annum, about 11 eggs on average, and larger females produce larger clutches than smaller females.


Acanthocercus atricollis FileSouthern Tree Agama Acanthocercus atricollis 6002525679jpg

It is found in Eritrea, Somalia, Ethiopia, Sudan, South Sudan, Uganda, D.R.C., Kenya, Tanzania, Zambia, Malawi, Mozambique, Zimbabwe, Angola, Botswana, Namibia, South Africa and Swaziland.


Some six races have been accepted, but some of them are not very distinct.

  • A. a. atricollis (Smith, 1849) – Southern tree agama, of southern Africa
  • A. a. gregorii (Günther, 1894) – coastal Kenya
  • A. a. kiwuensis (Klausewitz, 1957) – Lake Kivu
  • A. a. loveridgei (Klausewitz, 1957) – Tanzania
  • A. a. minutus (Klausewitz, 1957) – Ethiopia to Kenya
  • A. a. ugandaensis (Klausewitz, 1957) – Uganda to Tanzania
  • References

    Acanthocercus atricollis Wikipedia

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