A lovely beetle, but a bit of a pest!

Coraliomela quadrimaculata (Chrysomelidae)
Coraliomela quadrimaculata (Chrysomelidae)

This lovely beetle, whose full name is Coraliomela quadrimaculata, is a leaf-mining leaf beetle with a fondness for palms and coconut trees.  It is found in South America, so we should give it its Spanish name, Barata-do-coqueiro. This is in fact the name given to several species of chrysomelid beetles, whose larvae feed on the young leaves of palm trees in Argentina and Brazil. The adults are fairly large (2.5 to 3.0 cm long) and feed on palm leaves, although the larvae seem to do the most damage.  This particular species is a minor pest in the group and probably occurs widely without causing too much damage.

I came across these beetles on Yatai poñi or Yatay palms (Butia paraguayensis) whilst touring a ranch (San Juan Poriahu) in Corrientes Province, northeast Argentina.  These small palms are a feature of the Ibara wetlands in this area where they are an important component of the grasslands.

Yatay palms (Butia paraguayensis) in Ibara wetlands
Yatay palms (Butia paraguayensis) in Ibara wetlands
Yatay palm (Butia paraguayensis)
Yatay palm (Butia paraguayensis)

The beetles were abundant in mid-March and could be seen mating on the palms in the late afternoon.

Coraliomela quadrimaculata beetles mating
Coraliomela quadrimaculata beetles mating

Many thanks to Ted MacRae [Beetles In The Bush] for identifying it for me.

One thought on “A lovely beetle, but a bit of a pest!

  1. Osvaldo Di Iorio

    Dear rcannon992
    My name is Osvaldo Di Iorio, an entomologist at the University of Buenos aires. I would like if I can use your Coraliomela photograph in a paper in preparation giving the corresponding credit.
    Thank you very much in advance

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