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beetle? on the beach - Collops

beetle? on the beach - Collops
Baiting Hollow, Suffolk County, New York, USA
September 8, 2009
Size: tiny
I looked through rovebeetles and earwigs and decided it was probably not those. I don't have another idea for this one.
Very tiny, looked like a traveling thread on the beach. Came out from under an old log.
I only have this one photo.

Moved from Larvae.

Beetle on the Beach.
This is a larva of a species of Collops. The internal teeth on the prongs (urogomphi) at the tip of the abdomen are diagnostic for Collops. The species is most likely C. nigriceps (Say) which is a common eastern species found on beaches.

There were adult C. nigriceps nearby as well.
But getting this guy down to genus was beyond my expertise! Thanks for the info, I'll move it to Collops

Moved from ID Request.

I heard the news too.

good girl

I think I've got it!
So I think we should wait for the opinion of V Belov's friend, but this is what I found.

Melyridae! Immature insects states:

A number of larvae occur in on the ground or in soil and leaf litter, where they feed on living or dead animals. They are particularly common in sand, soils and on beaches; Amecocerus larvae were found in soils beneath dune vegetation. Endoeodes species occur in the debris accumulated the the high tide mark on beaches along the Pacific Coast.

Mature larvae 2.5-25mm (Usually 5-10). Body elongate and usually narrow, sometimes wider at middles, subcylindrical to slightly flattened. Lightly sclerotized except for head, usually tergum A9 , and paired plates (or pigmented areas) on thoracic terga; color cream to pink, red, or purple; vestiture of fine hairs, usually short and scattered but sometimes long and dense.

great call -- this is it
check Zaitsev's comment on about the prothoracic pattern

Ah, I did look at that one.
The really different color threw me off though.

you're an editor now, in case you haven't noticed
drinks on you

Yeah I heard :)
Just got my first practice moving it :)

Aha! I think you do have it!
I found this adult 8-30-09 very near where I found the immature:

The adult Collops does not match any on Bugguide.
None have the large thoracic spot.

I guess that you already checked these larvae.

No its not an elaterid.
Elaterid larvae have a nasale. This one has a free moving labrum. I also don't think its a tenebrionid since its pretty flattened. Tenebrionids are more round and the head is sort of "tucked in" to the body, not as distinct as this one. Also, elaterids and tenebrionids are often heavily sclerotized although not all tenebrionids are.

not an elaterid
When the photo is made a little larger (I don't know if you can view it that way so I'm adding this note) it looks like the abdominal segments flair out at the edges a bit and also looks like pale setae (don't know if I'm using the word correctly) or bristles catching the light along the thorax and abdomen.

Thanks, Natalie for trying to find out who this is.

How can you tell this is not an adult something?

Well I don't really know how to explain...
for one it doesn't have compound eyes, which means it is not an adult, and there are no wings. Obviously there are some wingless adult insects but that's a good place to start. Other than that I just know by looking at it that it is a beetle larva. A professor once told me "I don't really know how to explain how you're Natalie, but I know you are..." when I asked him how he knew something was in a certain family :-P Its kind of like that with a lot of things, this beetle being one of them.

And yes you are using setae correctly :) Thanks for pointing that out since I am not an editor I can't see enlarged images, that might help.

Thanks Natalie .. that is a very good explanation in it's unique way.

Check this .. New "expert" category .. Forum topic. (I don't know how to make this a live link)

It provides a way for contributer experts to view photos larger.
Not sure if this is finalized or still in the discussion stage.

Expert category
I just sent an e-mail to John asking him to make Natalie an expert. He will decide.
Update: Natalie is now an expert and can see full size images. Maybe she would make a nice editor, too.

Awesome thanks!
That does help alot. V Belov is going to show this to someone, he thinks it looks like a tenebrionid. Now that I can see the bigger picture I'll look through Immature Insects some more when I get home.

i said 'tenebrionoid', not 'tenebrionid' :-]
i don't feel confident enough about larvae to be any more specific...

Oops sorry!
I know you said tenebrionoid and just typed tenebrionid because I wasn't really thinking as I was typing.

Beetle larva
Larva of some kind of beetle to be sure. Maybe a rove beetle?

Not a staphylinid
According to Immature Insects staphylinid urogomphi are are on abdominal segment 9, cerci-like with large conspicuous setae, and segment 10 is an elongate cylinder, truncated cone or something inbetween.

This looks like some kind of fungus-eating larva to me. Unfortunately there are not a whole lot of (or any) pictures to compare to!

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