Comprehensive DescriptionRead full entry
A member of the Mantidactylus boulengeri-group, which contains M. boulengeri, M. boulengeri "leucocephalus", M. decaryi, M. eiselti, M. thelenae, M. klemmeri and M. webbi. This group is composed of rather small species (20-35 mm). Lateral metatarsalia are connected. An outer metatarsal tubercle is present, with the exception ofM. webbi. Webbing is absent between the fingers and reduced between the toes, except for M. webbi, in which the feet are moderately webbed. Nostrils are situated nearer to the tip of the snout than the eye. Males have paired subgular vocals sacs which are white in M. webbi and dark in the other species. Femoral glands are distinct in males, absent in females. These frogs are active and call mainly during the day. M. webbi and M. klemmeri live on mossy stones along brooks; calling males of the other species do not aggregate around water. Direct development has been observed in M. eiselti. On the lip, alternating light and dark transverse bands are present, as in the subgenus Brygoomantis, whose species are also mainly terrestrial with at least partial diurnal activity. Representatives can be distinguished from most other Mantidactylus by the paired subgular vocal sacs of males, only also present in the M. granulatus-group, which is composed of larger and mainly nocturnal species.
Mantidactylus eiselti (GUIBÉ 1975) is a small brownish species of Mantidactylus, males 20-23 mm. Dorsum more or less uniformly light brown. Lips with alternating yellow and brown transverse bands. Ventral surface with dark punctations. Hind legs with bands. Skin more or less smooth. Tympanum distinct, minimum about 2/5 of eye diameter. Tibiotarsal articulation reaches the nostril. Lateral metatarsalia connected. Webbing reduced. Males with a subgular vocal sac, which appears to be paired when not inflated because of the two blackish lateral skin folds on the throat. However the inflated sac is clearly single subgular as was also observed in M. thelenae. Males with oblong but rather indistinct femoral glands, not recognizable in preserved material.
Similar species: M. thelenae is the most similar species. M. boulengeri from Andasibe is similar in appearance, but its skin is usually more granular. Males can easily be distinguished by call and colouration. In M. decaryi, the tibiotarsal articulation reaches beyond the tip of snout. M. klemmeri differs in appearance and by its smaller tympanum. M. pseudoasper is larger.
Taken with permission from Glaw and Vences (2007).