Entomology Collection TitleImage Bugs Pinned
Species Page - Gyrinus sayi
browse search results ->Gyrinus sayi ->species page

E-mail this Page   
Print this Page   
Link to this Page   

scientific name    Gyrinus sayi    

More prevalent in lentic waters but commonly found on lotic waters in high numbers.

March to December. Most commonly collected May to August.

Dorsum black, body long and broad, 11th (most lateral) row of punctures (stria) on hardened fore-wings (elytra) close to the margin in the apical third (posterior), uniform net-like pattern (microreticulations) and sparse, uniformly spaced circular pits (micropuncturation) on elytra (visible at 50X magnification) (Oygur and Wolfe 1991). Elytra very shinny, sides of elytra bronzed, rows of punctures (different from micropunctures visible under low power called elytral stria) more deeply impressed laterally than medially (Fall 1922). Dorsum of abdominal segments 4-7 uniformly black, legs uniformly red (Oygur and Wolfe 1991). Most closely resembles Gyrinus picipes and G. dubius. Examination of male genitailia (aedeagus) may be necessary for a definitive identification. Male genitalia (aedeagus) medially ridged, tapering moderately towards apex, margin moderately sinuate. Gyrinus sayi can be separated from G. picipes by the presence of uniform microreticulation which is absent or non-uniform in G. picipes (Oygur and Wolfe 1991). Females of G. sayi have more distinct microreticulations than males, whereas females of G. picipes have the same microreticulations as males. Male length 5.5-6.4 mm and width 2.8-3.2 mm; female length 5.8-6.6 mm and width 3.2-3.6 mm.

Not apparently threatened

Newfoundland to coast of British Columbia, Northwest Territories to New Jersey.

Gyrinus lugens LeConte is a junior synonym (Oygur and Wolfe 1991).

quick link

Comments (0)Add New Comment

Comments are published according to our submission guidelines. The EH Strickland Entomological Museum does not necessarily endorse the views expressed.

Add New Comment (all fields are required)


Related Species Info
Display Hierarchy
References (2)
Specimen Info
There are 41 specimens of this species in the online database
Map Distribution
Adult Seasonal Distributioncreate a collection histogram with specimens
Specimen List (41)


Logo Department of Museums and Collections ServicesLogo University of Alberta