Megalagrion oahuense (lat.) Is a species of dragonflies from the Coenagrionidae family, described by Australian black entomologist Thomas Blackburn in 1884 [1] . Endemic to Oahu in the Hawaiian Archipelago [2] . A phylogenetically close species is Megalagrion nesiotes [3] .
| Megalagrion oahuense |
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| No rank : | Bilateral symmetrical |
| Subtype : | Tracheo-breathing |
| Infraclass : | Ancient winged insects |
| Subfamily : | Pseudagrioninae |
| View: | Megalagrion oahuense |
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Megalagrion oahuense (Blackburn, 1884 ) |
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Vulnerable speciesIUCN 3.1 Vulnerable : 12961 |
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Head and chest are black. The upper and lower lip and the back of the head are yellow. Postorbital spots unclear, connected to each other. The prothoracic strip and the lower part of the sides of the chest and the bottom of the chest are yellow. The length of the hind wings is 22 mm. Pterostigma rhomboid. Three cells between the quadrangle and the nodule on the wings. Legs are yellow with black spikes. The abdomen of the male is bright red, black along the posterior edge of the segments, and the female is black. The length of the abdomen is about 40 mm [1] [4] . Larvae are about 14 mm long. At the end of the body, there are short and thick caudal gills [5] .
They are known only from Oahu along the windward side of the ridge in the vicinity of Pearl Harbor [2] . It is found in the mountains at altitudes from 500 to 900 m above sea level [5] .
Larvae develop in plant litter in forests of tree ferns Gleichenia linearis , Freycinetia, and Cibotium [2] . Adults are found far from water bodies. In laboratory conditions, adults lived up to 17 days, eating small lepidopteran , larvae and pupae of beetles . In nature, eating dragonflies, Lepidoptera , Diptera and spiders , was noted. Females lay eggs on decaying fern litter. The color of the eggs is pale orange and a length of 0.82 mm [5] . It is included in the IUCN Red List of Threatened Species with VU ( Vulnerable Species ) status [6] .
A diploid set of chromosomes consists of 28 chromosomes . The length of the bivalents at the metaphase stage lies in the range from 2 to 4.6 μm. Chiasm is solitary [7] .
- ↑ 1 2 Blackburn T. Notes on Hawaiian Neuroptera, with descriptions of new species // Annals Magazine Natural History Series 5: journal. - 1884. - Vol. 14 . - P. 412-421 .
- ↑ 1 2 3 Daigle JJ The distribution of the Odonata of Hawaii // Bulletin of American Odanatology: journal. - 2000. - Vol. 6 , no. 1 . - P. 1-5 . - ISSN 1061-3781 .
- ↑ Scales JA & Butler MA The relationship between microhabitat use, allometry and functional variation in the eyes of Hawaiian Megalagrion damselflies (English) // Functional Ecology: journal. - 2016. - Vol. 30 , no. 3 . - P. 356-368 . - ISSN 1365-2435 . - DOI : 10.1111 / 1365-2435.12479 .
- ↑ Perkins RCL Neuroptera. (English) // Fauna Hawaiiensis. - 1899. - Vol. 2 , no. 2 . - P. 63-77 .
- ↑ 1 2 3 Williams FX Biological studies in Hawaiian water-loving insects. Part 1. Coleoptera or beetles. Part 2. Odonata or dragonflies (Eng.) // Proceedings of the Hawaiian Entomological Society: journal. - 1936. - Vol. 9 . - P. 235-345 .
- ↑ Megalagrion oahuense Blackburn . The IUCN Red List of Threatened Species . Date of treatment January 9, 2019
- ↑ Klauta B. The Chromosomes of the Hawaiian endemic dragonflies, Megalagrion oahuense (Blackburn) (Coenagrionidae: Pseudoagrioninae) and Nesogonia blackburni (McLachlan), (Libellulidae: Sympetrinae), with note on the cytotronomy gene aff (Odonata) (Eng.) // Proceedings, Hawaiian Entomological Society: journal. - 1969. - Vol. 20 , no. 2 . - P. 429-433 . - ISSN 0073-134X .
