Megalagrion jugorum
| Megalagrion jugorum | ||||||||||||
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| Scientific name | ||||||||||||
| Megalagrion jugorum | ||||||||||||
| ( Perkins , 1899) |
Megalagrion jugorum is anextinct dragonfly species from the family of slender dragonflies(Coenagrionidae), as far as the IUCN is aware. It occurred on the Hawaiian islands of Maui and Lānaʻi .
features
Megalagrion jugorum reached a body length of 50 to 57 mm and a wing span of 60 to 65 mm. It was an elongated red and black species that superficially resembled a very large form of Megalagrion hawaiiense . The head was black. The face and the horizontal stripes behind the eyes were red. The thorax had wide red and black stripes. The legs were red with black thorns. The abdomen was reddish. The dorsum was tinted black on segments V to VIII. The segments VI to VII were completely black on the top. The upper abdomen appendages of the males were longer than the lower ones and broadly forked at the tips. The females were similar in general body color to the males, but they were duller and more brown in color. The larvae are undescribed.
Habitat and way of life
The habitat was at altitudes of over 1000 meters. The species probably occurred in forested hills far away from watercourses, where they laid their eggs in seepage water or in damp foliage, probably in a similar way to the species Megalagrion oahuense, which still occurs on Oahu today . Nothing is known about their way of life.
Systematics
Robert Cyril Layton Perkins described this form as Agrion jugorum in 1899 . Clarence Hamilton Kennedy placed them in the genus Megalagrion in 1917 .
status
The IUCN lists Megalagrion jugorum since 1986 in the category "extinct" ( extinct ). According to the Bernice P. Bishop Museum , this species has not been seen since 1917. Ants and introduced ungulates are believed to be possible causes for the species' disappearance.
literature
- EC Zimmerman: Insects of Hawaii. Volume 2: Apterygota To Thysanoptera. 1948, p. 365.
- Dan A. Polhemus: Damsels in distress: A review of the conservation status of Hawaiian Megalagrion damselflies (Odonata: Coenagrionidae). In: Aquatic Conservation: Marine and Freshwater Ecosystems. Special Issue: Endangered Aquatic Habitats - A Symposium of the Entomological Society of America December 1992. Volume 3, No. 4, 1993, pp. 343-349.
- Dan A. Polhemus, Adam Asquith: Hawaiian Damselflies. A field identification guide. A Hawaii Biological Survey Handbook. Bishop Museum Press, Honolulu 1996, ISBN 0-930897-91-9 , p. 59.
Web links
- Megalagrion jugorum inthe IUCN Red List of Threatened Species 2016.3. Listed by: Odonata Specialist Group, 2006. Retrieved May 6, 2017.
Individual evidence
- ^ RCL Perkins: Neuroptera. Fauna Hawaiiensis 2 (2), Cambridge University Press, 1899: 31-89
- ^ CH Kennedy: Notes on the penes of damselflies (Odonata). No. 2. The close relations inter se of the Hawaiian agrionines. Entomological News 28, 1917: 9-14. pls. 2–3, figs. 149.
- ^ Hawaii's Extinct Species - Insects