Currently viewing the category: "Beetle Larvae"

Wonders from Malaysian Borneo!
Location: Malaysian Borneo
August 12, 2011 9:09 pm
Hey Bug-people!
A challenge for you!
I took myself backpacking through Southeast Asia a while ago, and came back with some amazing pictures of bugs.
I’ve included three of what were to me the most fascinating and baffling varieties. Can you help me identify them?
Signature: Doug

Netwing Beetle Larva, or Firefly Larva

Hi again Doug,
We have split up your question into separate postings.  …  Your third insect is a larval Firefly not unlike this North American example.  Did we meet your challenge?

Wow!  I guess everything’s bigger on Borneo, because that larval Firefly was  nearly three inches long!
Thanks for that. The info about the flatworm was particularly fascinating.

Hi again Doug,
We are ready to research the Bornean Firefly Larva, though we cannot discount that it might be a Netwing Beetle Larvae.  Eric Eaton says the way to tell the difference it to introduce a snail.  If the beetle larva eats the snail, it is a Firefly Larva.  If it prefers fungus, it is a Netwing Beetle Larva.  We imagine that there may also be snail and fungus specificity in the preferences.  Here is an example from The Flying Kiwi of a Larviform female Netwing Beetle from Viet Nam, and here is another example of a Netwing Beetle and The Flying Kiwi‘s, AKA Richard Seaman’s, written account:  “I didn’t notice that this one in Malaysia was glowing, but it turns out that both this and the Vietnamese “firefly” aren’t fireflies at all, they’re actually the larvae of net-winged beetles in the genus Duliticola, otherwise known as “trilobite larvae” because of their prehistoric shape; the one you see here is Duliticola hoiseni.   The drops of liquid on this one’s back look like they are some toxic substance exuded for protection, I’m not sure if that was for my benefit or whether it was already feeling stressed when I arrived.” Interestingly, last year Bert traveled to Malaysia and he sent us a Netwing Beetle or Firefly Larva as well as a Land Planarian.  Though there are similarities, they are both distinctly different for your examples.  We imagine there is great diversity in the jungles, and there may also be distinct local populations that over time have developed into distinctly different looking relatives that may or may not be different species.

Location: Mogollon Rim, AZ
July 28, 2011 8:12 am
While camping in Mogollon Rim, AZ in July, we rolled over a log and found these bugs, so the images you’re seeing are upside down. These guys were hardly moving, but there were other slow-moving bugs (the black ones) boring into holes in the log. I’m interested in figuring out what these are and I appreciate your time to help in that effort.
Signature: Jenn

Fungus Beetle Pupae

Hi Jenn,
This is a real puzzle for us,  but we believe we know what you encountered.  These look like the Larvae and Pupae of Lady Beetles, commonly called Lady Bugs.  Here is a photo of the Larvae and Pupae of a Twice Stabbed Lady Beetle from BugGuide, and though the match is not exact, we believe you should be able to note the similarities.  We are going to tag this as a mystery because we cannot figure out why such a large number of Larval Lady Beetles would decide to pupate in such a large aggregation under a log.  That does not seem characteristic of what we would expect.  Perhaps we are wrong and they are not Lady Beetle Larvae and Pupae, but we are relatively certain that they are some other group of Beetles.  We will contact Eric Eaton to see if he can provide an answer.  We also want to continue searching to see if there is any documentation of such an occurrence elsewhere on the internet.  Thank you so much for submitting this puzzling identification request.

Aggregation of Fungus Beetle Larvae and Pupae

Eric Eaton makes a correction
August 1, 2011
The beetle pupae are actually of the fungus beetle Gibbifer californicus.


Japanese Bugs
Location: NE Japan
July 27, 2011 6:29 am
Hi Bugman
I’ve just come back from a two week trip in Japan and as well as seeing some amazing shrines and temples I saw some pretty awesome bug life that being resident in the UK where very alien to me (like the Giant Japanese Hornet for example and a (sadly dead) Japanese Rhinoceros beetle). I’ve managed to identify most of my pics of the critters I saw but was hoping you might be able to help out with the three pics below.
Love you website by the way
Signature: Michael

Carrion Beetle Larva

Hi Michael,
This is a larva, and they can often be extremely difficult to identify to the species level.  We believe this is a Carrion Beetle Larva from the family Silphidae.  Though it is a different species, it does look rather similar to this American Carrion Beetle Larva from BugGuide.

What’s this Bug?
Location: Tehachapi, California (about 35 miles East Southeast of Bakersfield). The elevation there is about 3900ft.
May 17, 2011 3:23 pm
Hello, a friend recently (today) found this crawling across her floor at her home in Tehachapi, California (about 35 miles East Southeast of Bakersfield). The elevation there is about 3900ft.
It’s about 2.5in long.
We’ve ruled out millipede and centipede due to the inconsistency of the legs per segment. She assures me there were more legs than the 3 pair that can be seen in the photo. I’m thinking it’s in it’s larval or pupal stage.
What do you think?
Signature: with love? I don’t know what you mean by this.

Beetle Larva

This sure looks like a Western Banded Glowworm to us and you are correct that it is a larva.  Here is a photo on BugGuide that is very similar.

I’m impressed!
I’ve been reading up on your findings and I concur with your ID.  I was leaning towards some form of Coleoptera from Lepidoptera (just didn’t feel very moth-like).  I knew those Entomology classes in college would help out some day.
Thank you very much for helping out.
Mark Meredith
Field Botanist, Graphic Designer