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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Mayflies (Ephemeroptera) » Pisciforma » Heptagenioidea » Flatheaded Mayflies (Heptageniidae) » Maccaffertium » Maccaffertium vicarium
Photo#250237
Flatheaded Mayfly - Maccaffertium vicarium
Copyright © 2009 Stephen Luk

Flatheaded Mayfly - Maccaffertium vicarium
Eramosa River, Guelph, Wellington, Ontario, Canada
January 13, 2009
Size: 12 mm
In detritus. Size measurement excludes cerci. Stenonema sp., I think.
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Contributed by Stephen Luk on 24 January, 2009 - 3:10pm
Last updated 15 February, 2009 - 8:26am

Moved
Moved from Maccaffertium.
… tom murray, 15 February, 2009 - 8:26am login or register to post comments

Checked
The posterolateral projections on Ab9 are indeed longer than the ones on Ab8.
… Stephen Luk, 26 January, 2009 - 10:54pm login or register to post comments

ID
Yes, it does look like vicarium. I'll check for the spines
… Stephen Luk, 26 January, 2009 - 10:48pm login or register to post comments

Maccaffertium vicarium
Although a ventral view would help to confirm the identification, the dorsal pattern of dark bands across the the rear of the abdominal segments is typical of vicarium. (Older synonyms are Stenonema vicarium and fuscum.) This species also has a posterolateral projection on Ab9 that is as long or longer than the projection on Ab8.
… Lloyd Gonzales, 26 January, 2009 - 10:28pm login or register to post comments

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