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Moths of the Amazon and Andes
Twin-spot Myonia
Myonia graba  DRUCE, 1899
Superfamily - NOCTUOIDEA
Family - NOTODONTIDAE
subfamily - DIOPTINAE
Tribe - DIOPTINI
Myonia graba, Satipo, Peru  Adrian Hoskins
Introduction
The subfamily Dioptinae comprises of 456 known species arranged into 2 tribes and 43 genera. The moths are almost entirely neotropical in distribution: only one species Phryganidia californica being found north of Mexico. All are day-flying, and most are brightly coloured, typically with aposematic patterns in yellow, orange or white on a black ground colour. They are involved in Batesian mimicry rings with various Ithomiine butterflies, and with moths from the subfamilies Arctiinae ( Erebidae ) and Sterrhinae ( Geometridae ).
Dioptinae, like most other moths have tympanal organs 'ears' at the base of the thorax. These are generally accepted as having evolved to allow them to detect the echo-location calls of predatory bats. These moths however are all day-flying species, and experiments have shown that they are virtually deaf. This implies that their ancestors were nocturnal, and that the ability to hear was lost when they evolved to become day-flying and were no longer exposed to bats.
The genus Myonia ( previously known as Erbessa ) comprises of 59 known species. All are brightly coloured black and yellow day-flying moths.
Myonia graba is found in Colombia, Ecuador, Peru and Brazil.
Habitats
This species inhabits rainforest and cloudforest at elevations between about 200-800m.
Lifecycle
To be completed.
Adult behaviour

The adults are active in bright sunshine and can often be found as singletons imbibing mineralised moisture from the edges of puddles or small streams.

 

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