We describe two new frog species of the Madagascarendemic genus Gephyromantis, belonging to the G. tandroka
complex in the subgenus Duboimantis. Gephyromantis
(Duboimantis) saturnini sp. nov. is known from specimens
collected at Ampotsidy, in the District de Bealanana of the
Région Sofia of northern Madagascar. It is a large and
genetically distinct species with small interocular tubercles and
indistinct femoral glands that emits calls in series composed of
couplets and triplets. Morphologically and bioacoustically, it is
most similar to G. tandroka, but genetically it was recovered
as sister to G. schilfi, from which it is separated by an
uncorrected p-distance of 5.1 % in the mitochondrial 16S rRNA
gene. Gephyromantis (Duboimantis) grosjeani sp. nov. was
collected on the Sorata massif, in the District de Vohemar of
the Région Sava of northern Madagascar. It is a medium-sized
species with large and distinct femoral glands, which are a
distinctive characteristic from other members of this complex.
Genetically, it is distinguished from all other Gephyromantis
species by uncorrected p-distances of at least 5.1 % in the 16S
rRNA gene.