Genus - Ophiogomphus

Taxonomic Hierarchy for Freshwater Invertebrate Collection


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3 results for "Ophiogomphus"

Ophiogomphus colubrinus

Freshwater Invertebrate Collection

Common NameBoreal Snaketail SeasonalityFlying from early May to late August or early September (Needham et. al., 1955). IdentificationColoration is dominantly green on the head, eyes and thorax, with a black outline around the labrum and facial sutures as well as black lateral stripes on thorax. Eyes do not meet dorsally on the head. The anterior thoracic strip is divided by a narrow green line seen in many other Ophiogomphus species. Legs are entirely black, except for trace green markings on the femora and tibia of females. The abdomen is primarily black with interrupted dorsal and lateral stripes that appear bright yellow and noticeably widen on enlarged segments 7, 8 and 9 and continue on to the caudal appendages of males. Length of the abdomen can vary up to 10mm between individuals. Unlike most other species, male boreal snaketails have small dark coloured horns on their head similar to females; however, females of this species have two pairs of horns, one in front and one behind the eye (Needham et. al. 2000).

Ophiogomphus severus

Freshwater Invertebrate Collection

Common NamePale Snaketail SeasonalityAdults have a flight season occurring from May to September. IdentificationColoration of Ophiogomphus severus is similar to its close relatives, except that O. severus has a larger proportion of black across the entire body. The head and eyes are yellow with a black line across the frons and a black vertex. Eyes do not meet dorsally. Thorax is more greenish yellow than the head and abdomen with a diagnostic dark brown oval on the prothorax. Both the forewings and the hindwings have a yellow costal vein, but dark venation color throughout the rest of the wing. Leg segments show a mottled color pattern, the leg base yellow, the tarsi black and the femur and tibia displaying both colours. Abdomen is primarily yellow and black. Lateral stripes are continuous from the first to the terminal abdominal segment while the dorsal stripe is arranged as a row of large yellow spots ending on the ninth segment. Caudal appendages are also entirely yellow. Males and females of this species look very similar, but can be differentiated by more color on the legs of the female (Needham, et al 2000).

This species is divided into two subspecies: Ophiogomphus severus severus Hagen (described above) and Ophiogomphus severus montanus Selys which is described as having a larger lateral brown spot on the prothoracic segment and more black on segment 10 of the abdomen (Needham, et. al. 2000).

Ophiogomphus sp.

Freshwater Invertebrate Collection

Taxonomic Hierarchy for Freshwater Invertebrate Collection