Genus - Gyrinus

Taxonomic Hierarchy for University of Alberta E.H. Strickland Entomological Museum


Results

8 results for "Gyrinus"

Gyrinus affinis

University of Alberta E.H. Strickland Entomological Museum

Gyrinus bifarius

University of Alberta E.H. Strickland Entomological Museum

Gyrinus confinis

University of Alberta E.H. Strickland Entomological Museum

Gyrinus maculiventris

University of Alberta E.H. Strickland Entomological Museum

SeasonalityMay to August. Most Frequently collected July to August. IdentificationElongate and moderately convex (Fall 1922). Dorsum of abdominal segments 4-7 medially black, abruptly changing to orange laterally (Oygur and Wolfe 1991). Hardened fore wing (elytra) with 11th row (most lateral) of elytral punctures (stria) close to margin in apical half (posterior of body). Elytra shiny, lacking evident microreticulation. Apical margin of male genitalia (aedeagus) sinuate, basally flattened. Male length 5.0-5.9 mm and width 2.8-3.1 mm. Female length 6.0-6.5 mm and width 3.1-3.4 mm (Oygur and Wolfe 1991).

Gyrinus minutus

University of Alberta E.H. Strickland Entomological Museum

SeasonalityMarch to October. Most frequently collected July to August. IdentificationDorsum black, body short and narrow (Fall 1922). Dorsal surface dull from scale like microreticulation (net-like pattern visible at 40x magnification) (Oygur and Wolfe 1991). Dorsum of abdominal segments 4-7 black, 8th abdominal segment, thorax, and legs reddish orange (Oygur and Wolfe 1991). Underside of mid-thoracic segment (mesosternum) with a medial groove running anterior-posteriorly (Oygur and Wolfe 1991). Triangular plate (scutellum) between hardened fore-wings (elytra) with a raised ridge running anterior-posteriorally. Gender can be determined by the presence of an expansion of footpads (pro-tarsi) on the front legs of males. Size: male length 3.3-4.9 mm and width 1.7-2.0 mm. Female length 3.7-4.4mm and width 2.0-2.3 mm.

Gyrinus picipes

University of Alberta E.H. Strickland Entomological Museum

SeasonalityJanuary to August. IdentificationAppears highly polished, dorsally black with sides distinctly bronzed (Fall, 1922). Elytra usually without visible microreticulation (netlike structure) at 50x magnification (Oygur and Wolfe 1991). The 11th (most lateral) row of punctures (stria) close to margin in apical third of hardened forewing (elytra) (Oygur and Wolfe 1991). Abdominal segments 4-7 uniformly black (Oygur and Wolfe 1991). Strial punctures finer near suture (medially) (Fall 1922). Male genitalia (aedeagus) flattened throughout, tapering slightly towards apex, apex blunt. Most closely resembles G. sayi and G. dubius. Gyrinus picipes can be separated from G. sayi by absence of or non-uniform microreticulation in G. picipes which are present and uniform in G. sayi (Oygur and Wolfe 1991). Females of G. picipes have the same microreticulations as males, whereas females of G. sayi have more distinct microreticulations than males. Male length 4.6-5.3 mm and width 2.6-2.9 mm. Female length 5.6-6.2 mm, width 2.9-3.3 mm (Oygur and Wolfe 1991).

Gyrinus sayi

University of Alberta E.H. Strickland Entomological Museum

SeasonalityMarch to December. Most commonly collected May to August. IdentificationDorsum 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.

Gyrinus sp.

University of Alberta E.H. Strickland Entomological Museum

Taxonomic Hierarchy for University of Alberta E.H. Strickland Entomological Museum