Madagascar is home to almost half of all known 217 chameleon species. However, their habitats are also threatened to a dramatic level and the vast majority of the primary rainforest has already been destroyed. Scientists from Germany and Madagascar have now discovered three new species and revalidated another species. The paper is published this week in the open access zoological journal Vertebrate Zoology.
Madagascar is a paradise for nature lovers, since most of the land vertebrate species are only found on this large island off the east coast of Africa. The endemic lemurs and chameleons are of particular interest and biologists have been investigating these groups of animals intensively since the 19th century.
Two females of Calumma radamanus show territorial behavior when they meet due to their colorful displaying coloration.
Photograph: David Prötzel (ZSM/LMU)
However, the taxonomy (classification) of many species is still unclear, as in the case of the flap-nosed chameleon Calumma nasutum, which was described as early as 1836.
Intensive fieldwork in partly remote forest areas from northern to southern Madagascar showed that these small chameleons with the “nasal appendage” that gives them their name actually represent a complex of several different species.
Using modern methods, including the examination of the skulls and the bizarre genital organs (hemipenes) by micro-computed tomography and the analysis of DNA sequences, three new species were finally named and described:
Calumma emelinae from the east coast of Madagascar, C. tjiasmantoi from the southeast, and C. ratnasariae from the north. Another species (C. radamanus) that had previously not been recognized was revalidated.
“Without the use of the different methods and the intensive field work this species complex would certainly not have been clarified yet. Only the combination of the different data sets has led to a significantly better understanding of the chameleon group”, says Dr. Frank Glaw, curator for amphibians and reptiles at the Bavarian State Collection of Zoology in Munich.
The new work represents the last missing piece in the puzzle of the Calumma nasutum group, which consisted of only seven species when the authors of the study started working on this group back in 2014.
This number has now more than doubled to 16 species. For the entire family of chameleons (Chamaeleonidae), this means an increase of over 4%.
"By revising the taxonomy of the entire Calumma nasutum group, not only the protection status of the new species but also that of the already known species has to be re-evaluated," says Dr. David Prötzel, first author of the study and former doctoral student at the Ludwig-Maximilians University in Munich and the Bavarian State Collection of Zoology, "numerous species are probably endangered and depend on the protection of their habitats."
Dr. David Prötzel
Phone: 0176 63200513
Dr. Frank Glaw
SNSB – Zoologische Staatssammlung München
Münchhausenstraße 21, 81247 München
Phone: 089 8107 114
Prötzel, D., Scherz, M.D., Ratsoavina, F.M., Vences, M., Glaw, F. (2019). Untangling the trees: Revision of the Calumma nasutum complex (Squamata: Chamaeleonidae). Vertebrate Zoology, 70(1): 23-59. https://doi.org/10.26049/VZ70-1-2020-3
Dr. Eva-Maria Natzer | idw - Informationsdienst Wissenschaft
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