General body shape rather stout. SVL 20-27 mm (M 21-22 mm, F 24-25 mm). Upper head surface, dorsum and flanks usually blackish without recognizable dorsolateral colour border. Yellowish rostral stripe present. Femur and humerus yellow to green, this colour extending as large flank blotches onto the flanks and sometimes onto the dorsum. Distinct orange flashmarks present. Tibia, tarsus and foot orange, with or without blackish crossbands and marblings. Iris
mostly containing light pigment in its upper part. Rostral stripe often in contact with flank blotch. Specimens of unknown origin in the pet trade were more variable yellow colour in varying extension can sometimes be present on the dorsum. All intermediate states from a few yellow spots, to a reticulated yellow marbling or a dense yellow speckling are known. A greenish frenal stripe, often interrupted, can be present as well. Other specimens are nearly uniformly yellow dorsally and ventrally, with only a few blackish spots and marblings. In these specimens, the more distinct yellow surface in the flank blotch area is reminiscent of the typical colouration, but it is not clear whether they really are conspecific with M. madagascariensis
. Venter, throat and forelimbs black with light markings (mostly whitish-blue, sometimes yellow to green). These being generally rather large, rounded, and situated posteriorly on the venter. Distinct horseshoe marking present, more extended in males. Femur, tibia (except flashmark area), tarsus and foot often uniformly orange, in other specimens with areas of black and yellow (the latter corresponding to yellow colour on the dorsal surface). Areas of femoral "glands" often darkly pigmented. In some specimens, femur nearly totally black with blue spots. In "variable" specimens, entirely ventral pattern sometimes replaced by a dense yellow marbling.
Variation: Genetically, specimens from the Ranomafana area (in the general region where the types have been collected) are not placed in one clade with specimens from the Moramanga area. These south-eastern specimens which are to be considered as typical M. madagascariensis have a smaller body size but otherwise are not distinguishable from the central-eastern specimens by morphology or colouration.
Similar species: M. baroni is more slender and has no reddish flashmarks, M. pulchra is less colourful dorsally and has no distinct yellowish rostral stripe.
Taken with permission from Glaw and Vences (2007).