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For Insects, Spiders & Their Kin
For the United States & Canada
beetle in water - Helophorus

beetle in water - Helophorus
Lucan Conservation Area, Middlesex, Ontario, Canada
April 8, 2004
Size: about 5 mm
In puddle beside road. A poor image but I'm hoping someone will recognize the pattern on this one. It was trying to swim and not making much progress.

Helophorus sp.
This is a typical Helophorus species- note the 5 grooves on the pronotum, which are slightly visible. It was likely not 'swimming' in the water but had been disturbed and caught in the surface tension...which is why it was not 'making progress'. They usually are clinging to grasses or in the mud in such habitats.

Thanks, Andrew. Moved from Hydrophilidae to genus page in Guide.

Helophorus sp. ?

This is either a Helophorus (Hydrophilidae: Helophorinae) or Hydrochus (Hydrophilidae: Hydrochinae) water scavenger beetle. Usually the two genera are pretty easy to tell apart, but the photo is just obscure enough for me to be not absolutely sure it's the former genus.



Helophorus & Hydrochus
Thanks again, Zack. There's several species in both of those genera in Ontario, so I'm afraid distribution info at the provincial level can't help to rule out possibilities for this one.

On second glance - that sounds right.
Robin, try and get a better shot, this would still be a new genus [either one] for the guide.
The guide still needs plenty of genera - I'm still waiting for any Aphodiine Scarab.

A Riffle Beetle?
From the photo its tough, but it looks like a Riffle Beetle [Elmidae]. The adults are aquatic, but they crawl, don't swim.

If you ever get a better photo - post it, this is a new Family for the Guide.