Bichos Argentinos #3 – “Bicho Torito”

Diloboderus abderus, male | Buenos Aires, Argentina

In her appeal for submissions for her upcoming issue of An Inordinate Fondness, Susannah lamented the paucity of beetles in the closing weeks of her northern winter and mentioned in passing that even I had gone more than a week without posting about this great order.  I hadn’t realized that myself, so here I present Diloboderus abderus, one of the beetles that I encountered during my visit last weekend to La Reserva Ecológica Costanera Sur in Buenos Aires, Argentina.  This species, known commonly in Argentina as bicho torito (“little bull bug”) is common enough in Argentina and southern Brazil, where its white grub larvae have become somewhat of a pest in lawns, pastures, and grass crops such as wheat by way of feeding on the roots.  I first encountered this species during one of my previous trips to Argentina, where during a rain storm I saw literally hundreds of adults emerging from mowed grass medians in the city streets of Pergamino.  These photographs show two of numerous dead individuals that I found laying on the ground of similar medians just outside the reserve.  As with many scarab beetles in the subfamily Dynastinae (containing also the recently featured Dynastes tityus), males (above) are armed with pronotal and cephalic horns – presumably for use in sexual combat – while females (below) are unarmed.

Diloboderus abderus, female | Buenos Aires, Argentina

Copyright © Ted C. MacRae 2011

About Ted C. MacRae

Ted C. MacRae is a research entomologist by vocation and beetle taxonomist by avocation. Areas of expertise in the latter include worldwide jewel beetles (Buprestidae) and North American longhorned beetles (Cerambycidae). More recent work has focused on North American tiger beetles (Cicindelidae) and their distribution, ecology, and conservation.
This entry was posted in Coleoptera, Scarabaeidae and tagged , , , , , , . Bookmark the permalink.

15 Responses to Bichos Argentinos #3 – “Bicho Torito”

  1. Pretty amazing little bull! What’s the function of the fuzz at the base of the horns? If the that orange color were on a bird, I’d guess it’s used in a mating display.

    • I had suggested the same thing in my Dynastes tityus post, but the consensus seems to be that it helps males get a better grip on their opponent during combat. Makes more sense to me now that I think about it, as these beetles likely don’t have the best eyesight.

  2. Margarethe says:

    Everybody asks about that fuzz during events like ‘Meet the Beetles’ – wished I knew.
    Beetle season is slowly starting again, I was collecting in the dunes of western AZ last week, so now I’m working on one blog on Tenebs and one on Dune Weevils.

  3. James C. Trager says:

    I had noticed the slacking on beetle posts, but would say you’re back on a roll with this one. Wish our lawn grubs/June bugs were this cool!

    (And thanks for the nice ant during the brief break from beetles.)

    • Beetles were not so numerous this time around, and this may well be the most visually impressive beetle of the trip. I do sttill have some beetles from Brazil that I haven’t shared yet, as well as from last fall’s tiger beetle trip.

      The twig ant was the best ant I photographed, but I’ve got a few Camponotus/Ectatomma-looking things (haven’t looked closely at them yet).

  4. nellie says:

    It looks like a construction vehicle like a “Bobcat.”

  5. Pingback: The Sunday Bug Bash 3 | The Bug Whisperer

  6. Chris Brown says:

    Hi Ted,
    I had to do a double take when I looked at this post since I finally took the time to photograph Diloboderus when I was there in February. I’ve always been impressed with these guys but I wasn’t motivated enough to snap a few pics until I finally found one alive. Glad you were able to make it to Costanera Sur– looking forward to hearing more about it.
    Chris

    • I looked all over to see if I could find any adults still alive – I really don’t like photographing dead individuals unless I have to. The pic still turned out pretty good – can’t wait to see yours!

  7. Pingback: An Inordinate Fondness #15! | The Dragonfly Woman

  8. Pingback: The Sunday Bug Bash 3 | Splendour Awaits

Commentaria

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s