Butterflies of the
Amazon and Andes
SALVIN & GODMAN, 1868
Family - NYMPHALIDAE
subfamily - SATYRINAE
Tribe - SATYRINI
subtribe - EUPTYCHIINA
Oressinoma sorata, Machu Picchu, Peru ©
Oressinoma is classified, perhaps
( as the venation has unique characteristics ) under the same
subtribe as the Euptychiine ringlets and
Taygetis deadleafs. As well as differences in venation, the
wing shape and lack of ocelli point to the need for taxonomic
The two species are typhla, found from
Costa Rica to Bolivia, and sorata,
found only in southern Peru and Bolivia. The latter differs in
having the white zone on the wings narrower, more clearly
delineated, and more rectangular in profile.
Oressinoma sorata is
localised in distribution, occurring near streams, or in association
with swampy areas where the larval foodplants grow. It is
generally found at higher elevation, circa 2000-2800 metres, and is
restricted to southern Peru and Bolivia.
Oressinoma sorata, Manu cloudforest, 2600m, Peru ©
The eggs are pale shining green, spherical, and laid singly on the
The fully grown larvae are
green, with a rough texture, with dark green longitudinal lines
along the back and sides. They feed nocturnally on
Cyperus ( Cyperaceae ).
butterflies are usually encountered singly, or in two's and three's.
They are active only in cloudy weather or weak hazy sunlight. Males
perch on sedges or ferns, often for long periods, but remain alert at
all times. If disturbed they dart up rapidly, but then lazily descend
to resettle on foliage a short distance away. Both sexes feed at
rotting fruit, decomposing fungi and dung.
Courtship takes place in late
morning. The perching male flies up to intercept a passing female,
hovering above her ( probably while disseminating pheromones ) until
she settles. At this point the pair face each-other, and the male
leans forward to press his antennae against hers, while vibrating his
wings. If receptive, the female allows him to manoeuvre alongside her