Erythrodiplax cauca
| Erythrodiplax cauca | ||||||||||||
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| Erythrodiplax cauca | ||||||||||||
| Borror , 1942 |
Erythrodiplax cauca is a medium-sized dragonfly species of the genus Erythrodiplax from the subfamily Sympetrinae . The species has so far onlybeen detectedalong the Río Cauca in the province of Colombia of the same name. The species name is derived from this limited occurrence. Neither the larvae nor the female have been described so far.
Construction of the Imago
The male of the Erythrodiplax cauca is intensely dark in color. The face has a very dark reddish brown tone, which is on the forehead ( frons and) labrum in black passes. The forehead, which appears to be two-humped due to a pronounced furrow, is also almost black in places. The back (dorsum) of the thorax is dark brown to black, apart from two smaller yellowish-brown tubercles , while a greenish brown tone dominates on the sides.
The wings are transparent except for a spot at the base. In the forewing this spot is deep dark red-brown and becomes lighter on the outside. Its extension extends almost to the first Antenodal loader . In the hind wing, which is between 24 and 16.5 millimeters long, the spot is black-brown with again lightened edges. Here the stain extends into the area of the first of the seven to eight antenodal veins. In the front wing the animal has between nine and eleven antenodal veins plus the incomplete last antenodal vein that is common in the genus. The yellowish wing mark ( pterostigma ) measures 3.1 to 3.6 millimeters. The membranule is brownish.
The legs are brown from the hip ( coxa ) over the thigh ring ( trochanter ) to the thigh ( femur ) and from there black. The abdomen , which measures between 19 and 22 millimeters, is in turn very dark reddish brown in color. There is a black longitudinal band on the sides and a brownish longitudinal band on the top. The lateral band begins on the fourth segment and is interrupted at the beginning of this and the following two segments. The dorsal ligament also turns black in the eighth to ninth segment. The abdominal appendages have six to eight ( ventral ) bristles located on the underside ( distal ) two-thirds away from the body . The outer part of the hamulus is very short and very roughly rounded. On the slightly shorter, inner part there is a curved hook. This feature allows the species to be distinguished from the extremely similar species E. abjecta and E. melanorubra , as the inner and outer parts of these species are of equal length. Furthermore, both species have a relatively pronounced keel on the hamulus, which is completely absent in Erythrodiplax cauca . The structure of the penis can also be used to differentiate. In contrast to E. abjecta , E. cauca has smaller bumps on the tip. In comparison with E. melanorubra , the abrupt widening of the tip is striking . The last segment of the penis is relatively long.
The previously not described female probably resembles the other representatives of the Connata group , to which Erythrodiplax cauca also belongs.
Individual evidence
- ↑ a b c d e Donald Joyce Borror : A Revision of the Libelluline Genus Erythrodiplax (Odonata) . Ohio State University, Columbus 1942, pp. 198ff
- ^ Garrison, von Ellenrieder , Louton: Dragonfly Genera of the New World . Johns Hopkins University Press, 2006, ISBN 0801884462 , pp. 280f
Web link
- Erythrodiplax cauca inthe IUCN 2013 Red List of Threatened Species . Posted by: von Ellenrieder, N., 2007. Retrieved February 19, 2014.