Wednesday, August 20, 2014

[Herpetology • 2014] Boophis ankarafensis • A New Species of the Boophis rappiodes group (Anura, Mantellidae) from the Sahamalaza Peninsula, northwest Madagascar, with Acoustic Monitoring of its Nocturnal Calling


Boophis ankarafensis
Penny, Andreone, Crottini, Holderied, Rakotozafy, Schwitzer & Rosa, 2014


Abstract
A new species of treefrog of the Boophis rappiodes group (Anura, Mantellidae) is described from the Sahamalaza – Iles Radama National Park in northwest Madagascar. This new species is green in colour with bright red speckling across its head and dorsum; similar in morphology to other species of this group including: B. bottae, B. rappiodes, B. erythrodactylus and B. tasymena. The new species can be distinguished by its advertisement call and by a genetic divergence of more than 4.9% in the analysed mitochondrial 16S rRNA gene fragment. Its call consists of two note types: a trill and a click; although similar sounding to B. bottae, the trill note of the new species has a faster pulse rate while the click note is predominantly two-pulsed rather than three. All individuals were detected from the banks of two streams in Ankarafa Forest. The new species represents the only member of the B. rappiodes group endemic to Madagascar’s western coast, with the majority of other members known from the eastern rainforest belt. Despite its conspicuous call, it has not been detected from other surveys of northwest Madagascar and it is likely to be a local endemic to the peninsula. The ranges of two other amphibian species also appear restricted to Sahamalaza, and so the area seems to support a high level of endemicity. Although occurring inside a National Park, this species is highly threatened by the continuing decline in the quality and extent of its habitat. Due to these threats it is proposed that this species should be classified as Critically Endangered according to the IUCN Red List criteria.

Keywords: Amphibia, Boophis ankarafensis sp. n., Sahamalaza – Iles Radama National Park, advertisement call, conservation

Figure 2. Life colouration of Boophis ankarafensis sp. n.:
A Rostral view of a male paratype (MRSN A6975) B Dorsal view of the same male
C Female specimen in resting position on a leaf (specimen not collected) D Dorso-lateral view of the holotype with day-time colouration (MRSN A6973).

 Etymology: The term ankarafensis is a specific epithet deriving from the species’ terra typica, the Ankarafa Forest. The name is used as an adjective in the nominative singular.
Holotype: MRSN A6973, adult male (Fig. 2D and Fig. 3D) collected at Ankarafa Forest (Sahamalaza Peninsula, north-western Madagascar), 14°22.85'S, 47°45.52'E; ca 140 m a.s.l., transitional forest, 26 January 2013, leg. G. M. Rosa.

Figure 3. Breeding activity of Boophis ankarafensis sp. n.:
A Paratype MRSN A6976 B–C Vocalising males sitting on leaves and on a branch (specimens not collected)
D Male holotype MRSN A6973 and female A6974 E Couple in axillary amplexus.


Samuel Penny, Franco Andreone, Angelica Crottini, Marc Holderied, Lovasoa Rakotozafy, Christoph Schwitzer and Gonçalo Rosa. 2014. A New Species of the Boophis rappiodes group (Anura, Mantellidae) from the Sahamalaza Peninsula, northwest Madagascar, with Acoustic Monitoring of its Nocturnal Calling activity. ZooKeys. 435: 111-132. DOI: dx.doi.org/10.3897/zookeys.435.7383

A new species of endemic treefrog from Madagascar

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