Genus - Coenagrion

Taxonomic Hierarchy for Freshwater Invertebrate Collection


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5 results for "Coenagrion"

Coenagrion angulatum

Freshwater Invertebrate Collection

Common NamePrairie bluet SeasonalityAdults fly from late May until early August, later in the southern part of its range. IdentificationThe prairie bluet is more robust and darker blue in colour than the other Eurasian bluets (C. interrogatum and C. resolutum) found in North America (Walker 1953). Males have a distinct colour pattern on the abdomen; segments 3 to 7 are black with blue bands that become progressively smaller towards the end of the abdomen. The end of the abdomen is almost completely blue (Walker 1953, Acorn 2004). Males also have a distinctive black spot on the top of the second abdominal segment and slightly widened terminal abdominal segments (Westfall and May 1996). Female colours are usually yellow-green to tan but can be blue like the males (Westfall and May 1996). Abdominal segments 3 to 7 are dark without coloured rings and segment 8 has pale colouration on top at the base (Walker 1953, Acorn 2004). The dorsal surface immediately behind the head on females has three lobes on the posterior margin; the middle lobe projects above the other two (Walker 1953). Prairie bluets are small damselflies, rarely exceeding 3 cm in length. Larvae of the prairie bluet are difficult to distinguish from the other Eurasian bluets or even American bluets (genus Enallagma) or forktails (genus Ischnura). The prairie bluet has no obvious characters that allows for identificaion in the field. Coenagrion larvae are of average stature with the posterior margin of the head rounded and eyes not very prominent (Walker 1953).

Coenagrion cyathigerum

Freshwater Invertebrate Collection

Coenagrion interrogatum

Freshwater Invertebrate Collection

Common NameSubarctic bluet SeasonalityAdults fly late May to late July depending on latitude. IdentificationThe subarctic bluet is similar in size and proportions to the taiga bluet (C. resolutum) but has different colour patterns and markings (Walker 1953). Males have a black mark on the underside of the thorax in the shape of a Y while the taiga bluet has no markings (Westfall and May 1996). On each side of the top of the thorax are wide, broken blue strips (appear to be on their shoulders) that are wider than the black strips below (Walker 1953, Acorn 2004). Female subarctic bluets also have black markings on the underside of the thorax (Westfall and May 1996) Abdominal segments 3 to 7 have dark streaks on the underside and blue or greenish rings, segments 8 and 9 have blue or greenish areas on the dorsal surface (Walker 1953, Acorn 2004). Subarctic bluets are small damselflies, rarely exceeding 3 cm in length. Larvae of the subarctic bluet are difficult to distinguish from the other Eurasian bluets (C. angulatum and C. resolutum) or even American bluets (genus Enallagma) or forktails (genus Ischnura). The subarctic bluet has no obvious characters that allows for identification in the field; two published keys use very finely detailed characters (Baker and Clifford 1980, Canning and Canning 1980). Coenagrion larvae are of average stature with the posterior margin of the head rounded and eyes not very prominent (Walker 1953).

Coenagrion resolutum

Freshwater Invertebrate Collection

Common NameTaiga bluet SeasonalityAdults fly late-May to mid-August depending on the location. IdentificationThe taiga bluet has pale blue to almost turquoise colouration (Westfall and May 1996). It is similar in size and proportions to the subarctic bluet (C. interrogatum) but has different colour patterns and markings (Walker 1953). Males do not have a black mark on the underside of the thorax like that which is found on the subarctic bluet (Westfall and May 1996). On each side of the top of the thorax are narrow blue stripes (appear to be on their shoulders) that are sometimes broken and resemble an exclamation mark. These shoulder strips are narrower than the black strips below and come to point above the dot in the exclamation mark (Westfall and May 1996). Abdominal segments are mostly pale blue on top and yellowish-green on bottom with distinctive markings: segments 1 and 2 have narrow dark rings; segment 2 has a black U-shape on top with arms of the U on each side of the segment; segments 3 and 4 segments are blue at the end; half of segment 5 and segments 6 and 7 form one large black ring; segments 8 and 9 are blue and the terminal segment is black (Walker 1953, Cannings 2002, Acorn 2004). Female taiga bluets can be coloured like the males or yellow-green to brownish (Walker 1953). Females do not have a black mark on the underside of the thorax. Most of the abdomen is dark with pale rings, some in the mid-abdomen are interrupted, more prominent on the terminal segments (Walker 1953, Westfall and May 1996, Acorn 2004). ). Taiga bluets are small to medium damselflies that can be just over 3 cm in length. Larvae of the taiga bluet are difficult to distinguish from the other Eurasian bluets (C. angulatum and C. interrogatum) or even American bluets (genus Enallagma) or forktails (genus Ischnura). The taiga bluet has no obvious characters that allows for identification in the field; two published keys use very finely detailed characters (Baker and Clifford 1980, Canning and Canning 1980). Coenagrion larvae are of average stature with the posterior margin of the head rounded and eyes not very prominent (Walker 1953).

Coenagrion sp.

Freshwater Invertebrate Collection

Taxonomic Hierarchy for Freshwater Invertebrate Collection