New distribution data of Rieppeleon brachyurus in Mozambique

New distribution data of Rieppeleon brachyurus in Mozambique

Beobachtungen Verbreitung Science

Rieppeleon brachyurus is a small stump-tailed chameleon species, first described at the end of the 19th century from the Shire Highlands south of Lake Malawi. The species has since been found in Malawi, Tanzania and Mozambique. In Mozambique, it was previously known from rainforests and gallery forests, known as miombo forests. Miombo forests are very open dry forests with sparse grass cover, giving them a savannah-like appearance (hence the term ‘forest savannah’). The Zambezi River, which runs across Mozambique, was previously considered the natural boundary for the occurrence of Rieppeleon brachyurus.

Herpetologists have now discovered that the species also occurs south of the river. They found two juvenile individuals and two adult females of the species in Coutada 11, a 5000 km² hunting concession in the heart of Mozambique. The animals were found there in a sand forest, a rare type of tropical forest on sand dunes, right next to a shallow wetland. These observations extend the previously known range of the species by about 250 km further south.

The authors also report two further new locations where Rieppeleon brachyurus has been found, in Taratibu and Montepuez Rubi Mining Concession, both of which are located north of the Zambezi River. In both observations, the ground chameleons were found in miombo forest at altitudes between 250 and 400 m.

Rieppeleon brachyurus (Günther, 1893) Beardless Pygmy Chameleon First records south of the Zambezi River
W. Conradie, D. Botma, C. Nanvonnamuquitxo
African Herp News 88, 2025: 28-33
DOI: not available
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Photo: Juvenile Rieppeleon brachyurus in Mozambique, photographed by Delport Botma, from the above-mentioned publication

Comparison of pelvic girdles in chameleons

Comparison of pelvic girdles in chameleons

Science

The anatomy of chameleons is strongly adapted to their way of life. Tree-dwellers differ in many aspects from ground-dwellers. The pelvic girdle has been little studied anatomically in chameleons so far – a publication from the USA now deals with it in more detail.

For the study, the pelvic girdles of 22 chameleons were isolated from existing microcomputer tomography scans and displayed in 3D. These were measured to 16 different lengths and angles using software. Archaius tigris, Bradypodion damaranum, Calumma gallus, Calumma parsonii parsonii, Chamaeleo zeylanicus, Furcifer balteatus, Kinyongia matschiei, Kinyongia tavetana, Nadzikambia mlanjense and Trioceros quadricornis gracilior were assigned to tree dwellers. Brookesia brygooi, Chamaeleo namaquensis, Palleon nasus nasus, Rhampholeon temporalis and Rieppeleon brachyurus were attributed to ground-dwelling species. The species Bradypodion occidentale, Brookesia ebenaui, Chamaeleo anchietae, Furcifer campani, Rhampholeon spinosus, Rieppeleon kerstenii kerstenii and Trioceros goetzei goetzei were classified as semiarboreal. Mainly males were examined.

As expected, the evaluation showed that tree-dwelling chameleons had narrower, shorter girdles than ground-dwelling ones. The narrower pelvic girdle makes it easier to hide behind branches and flatten the body to the maximum. It also ensures that the body’s centre of gravity is closer to the branch and thus increases stability when climbing. Ground-dwelling chameleons, on the other hand, had larger and wider pelvic girdles. These allow them to step more quickly and provide greater stability when walking on ground surfaces.

How phylogeny and arboreality affect pelvic girdle anatomy of chameleons
Dakota J. John
Honors Thesis 299, University of South Dakota, 2023
DOI: none