Observation_229893

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Observation_229893
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RS: Nagadeba cinerea Hampson, 1895. The Fauna of British India including Ceylon and Burma. Moths, Vol.3. Taylor & Francis, London. Noctuidae (cont.) to Geometridae 546 p - 226 figs. Text at- https://archive.org/details/moths03hamp/page/52/mode/2up
N. cinerea and N. curvilineata have been synonymized in LepIndex and Funet. Hence, the only two species in the NE are N. castanealis and cinerea.
Hampson describes the difference as cinerea being more grey-brown rather than red. The prominent dentate submarginal line can be seen here and the HW of indecoralis can be compared against the cinerea description with this image (https://en.wikipedia.org/wiki/Nagadeba_indecoralis#/media/File:Nagadeba_indecoralis_09152.jpg)
Fahim's image shows a dentate submarginal line and is otherwise generally similar to indecoralis with the grey tinge and faded lines but is overall brown.

Nagadeba indecoralis is the most common one from the genus and has been photographed and reported from S India but the photographic records of the other 3 species are scanty. https://twmoth.tesri.gov.tw/peo/FBMothQuery?F=Erebidae&G=Nagadeba&S=Nagadeba%20indecoralis

N. indecoralis OD. https://archive.org/details/listofspecimenso3334brit/page/1521/mode/1up?view=theater

JD : agree with Rachit, & this can be compared with https://www.inaturalist.org/observations/196048

Nagadeba Walker, [1866] species known from India.
Nagadeba cinerea Hampson, 1895. India: Sikkim, Nagaland, Andaman Is.
Nagadeba indecoralis Walker, [1866]. India; Nepal; Myanmar; Sri Lanka.
Nagadeba polia (Hampson, 1891). India: “Nilgiris”.
Nagadeba castanealis Hampson, 1895. India: Sikkim, Nagaland.

For me this is a very close match with Nagadeba indecoralis Walker, [1866] with the red-brown visible on the wings. See https://www.inaturalist.org/taxa/204878-Nagadeba-indecoralis

GI: Some of the morphological features such as the tarsi colour are not available for comparison. There appears to be a mixture of features that are seen in cinerea and indecoralis. "dentate submarginal line" is seen in one of the indecoralis image on /twmoth.tesri.gov.tw. There is nothing in this image that can unambiguously point towards cinerea or indecoralis. Why not leave it at the Genus level or the time being. Collection of this species and further analysis is needed to confirm
My id: Nagadeba sp. or at best Nagadeba cf cinerea as its been photographed from North East
Observation Reference