Blue Riverjack Blourivierjuffer
Also known as Kubusi Streamjack or Blue Streamjack
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Blue Riverjack (Kubusi Streamjack) , Metacnemis valida, Genus Metacnemis, Family Platycnemididae, medium sized, stout, strikingly primarily pale blue, with black stripes on thorax, and conspicuous black rings on abdomen.
Key identification features:
- Face dull black with a little brown. Labrum pale blue dull black with a little brown. Labrum pale blue with a central black spot. Anteclypeus grey. Postclypeus grey with two lateral streaks. Head above, black Neck pale blue with wide central black stripe.
- Eyes dull pale blue, with some brown
- Thorax pale blue, strongly marked with narrow black stripes.
- Wings clear with black veins. Pterostigmas light brown, almost square in shape.
- Segments 2 to 6 with striking incomplete black rings against light blue background. Segment 7 with black stripe running along top. Segments 8 to 10 with fine black rings against light blue. Segments 8 and 9 with small black spots on either side. Superior appendages long, black.
- Patterning similar to male.
- Eyes light brown above with distinct brown bn abobe ligh brown lower margin.
- Black is replaces by brown black, pale blue not so vivid, except lower half of synthorax
- Strong pale white/light brown stripe running across side of thorax;
- Abdomen with brown saddle-like markings at hind margin od segment. S 9-10 distinctly bulbous
- Thorax has light brown white stripe wat lower thorac. Dorsal thorax greenish brown with darke brow dorsal carina stripew
- Head, neck,thorax and segments 9 to 10 greenish brown above.
Compared with other species:
- Colouration, stout body, and its short pterostigmas make this species unmistakable
- Only in the ECP, with few records from southern KZN
- Spesbona angusta (Spesbona) is much lighter blue than, and much larger and more robust.
- Mesocnemis singularis (Savanna Riverjack) has similar behaviour, but is all pale blue,distinctly pruinescent, and inhabits savanna rivers.
- Blue bands on abdomen may be similar to Africallagma sapphirinum, (Sapphire Bluet)
Distribution and habitat:
- ECP, with few records from southern KZN. The species may be more abundant as previously assumed. More records requiered
- Rivers and streams in open landscapes, but sometimes shaded by gallery forest. Usually with rocks and probably often submerged roots and/or dead trunks or branches. Inferred to occur from 0 to 1400 m above sea level.
Powerful flyer that hawks out over fast flowing rivers or stream