Probably Giant Silkmoth Caterpillars in the genus Arsenura from Brazil

Subject: Ascalapha (Probrably)
Location: South of Brazil
November 7, 2016 7:38 am
Every year, these caterpillars came and use to stay in different species of trees. The most commum tree is the Prunus selowii. They use to stay in a big group , normally .8 m to 1,0 abovo the ground. They are very predate by hemiptera insesct, as you can see in the picture.
Totally inofensive, I means, they don´t provoque any irritation in the skin when manipulate.
Signature: Wilsonpni

Possibly Morpho Caterpillars
Giant Silkmoth Caterpillars

Dear Wilsonpni,
Though your caterpillars resemble the caterpillar of a Black Witch,
Ascalapha odorata, based on this BugGuide image, we do not believe that is a correct identification.  We are pretty certain Black Witch Caterpillars do not feed in such aggregations.  Though the color is different, your caterpillars remind us of Morpho Caterpillars from our archives.  We will contact Keith Wolfe to get his opinion.  The image of the Predatory Stink Bug nymph feeding on a Caterpillar is a nice addition to our Food Chain tag.

Olá Daniel,
Nope, sorry, these are moth caterpillars, those of Morpho appearing distinctly different.

Aggregation of possibly Morpho Caterpillars
Aggregation of probably Giant Silkmoth Caterpillars

Update:  November 8, 2016
Thanks to a comment from contributor Cesar Crash of Insetologia, we now believe these are Giant Silkmoth Caterpillars from the genus

Predatory Stink Bug preys on Caterpillar
Predatory Stink Bug preys on Caterpillar

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