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smaller Hydrophilidae - Enochrus

smaller Hydrophilidae - Enochrus
Medford, (~15 miles east of Philadelphia, PA) Burlington County, New Jersey, USA
May 27, 2007
Size: ~4mm
smaller Hydrophilidae - maxilary palpi do not appear longer than antenna on this one.

came to UV light

Images of this individual: tag all
smaller Hydrophilidae - Enochrus smaller Hydrophilidae - Enochrus smaller Hydrophilidae - Enochrus smaller Hydrophilidae - Enochrus

Made a group page, and deleted the perplexus page.

Moved from Enochrus.


This is a species of Enochrus--the palps are indeed longer than the antennae, but they are either broken off or not visible in these shots. Positive species ID is not possible from these two images.

Hi Andrew, good to see you've
Hi Andrew, good to see you've joined in on the fun of Bugguide! It's great to have a Hydrophilid expert and water beetles in general!

E. perplexus
a head shot was added to show light coloration in front of eyes. When combined with 5th abdominal sternum having little to no apical emargination, this one now appears to key to E. perplexus LeConte. Type photo available from MCZ.

Corrections welcome, and another new species for BugGuide :)

This species group of Enochrus is unfortunatley still not identifiable with certainty in these photos. While it is likely that the species is in fact E. fimbriatus (E. perplexus is no longer the valid name), it can only be distinguished from E. interruptus by a notch in the aedeagus, which requires dissection. Since the northeast containes both species, ID from these photos is not recommended. Head coloration can be valuable for ID, but is both sexually dimorphic and varies by region in this genus, which can cause added confusion.

Thanks Andrew
thanks for the correction, Andrew. The Downie and Arnett key didn't mention the head coloration being dimorphic. To try and "unclutter" the genus pages, for this type of situation we usually create a group page that encompasses both species.

Thanks Andrew,
I'll take another look at the palps when I get a chance. And given the genus, perhaps from Downie and Arnett I can figure out what other characteristics to show. Thanks taking a look,