Amphicnemis ecornuta Selys, 1889

Dow, Rory A., Choong, Chee Yen & Ng, Yong Foo, 2010, A review of the genus Amphicnemis in Peninsular Malaysia and Singapore, with descriptions of two new species (Odonata: Zygoptera: Coenagrionidae), Zootaxa 2605, pp. 45-55 : 49-50

publication ID	https://doi.org/ 10.5281/zenodo.197652
DOI	https://doi.org/10.5281/zenodo.5196156
persistent identifier	https://treatment.plazi.org/id/9A1C8796-C737-EF7B-3F96-FA09FBDDF175
treatment provided by	Plazi
scientific name	Amphicnemis ecornuta Selys, 1889
status

Treatment

Amphicnemis ecornuta Selys, 1889 View in CoL

( Figs. 1 View FIGURES 1 – 2 , 4 View FIGURES 3 – 6 , 10 View FIGURES 9 – 14 , 16 View FIGURES 15 – 17 , 19 View FIGURES 18 – 21 , 23 View FIGURES 22 – 25 )

Amphicnemis ecornuta Selys 1889: 482 View in CoL –483 (original description ♂, Sumatra); — Krüger 1898: 123 –125 (Sumatra); — Laidlaw 1913: 74 (brief characterisation); — Lieftinck 1935: 10 (records from Sumatra); — Lieftinck 1937: 101 (note); — Lieftinck 1940: 363 View Cited Treatment (♂ key), 366 (Ψ key), 367–368 (discussion), fig. 15 (♂ synthorax), pl. 15, fig. 3 (♂ appendages); — Lieftinck 1954: 65 (distribution); — van Tol 1992: 88 (index to references to this species in Lieftinck’s publications); — Hämäläinen 2000: 54 (Pahang); — Orr 2005: 9, 42 (brief description, illustration of male appendages and pterostigma).

Material. Indonesia, Sumatra (in RMNH): ɗ, south Sumatra, Lampongs, Kedaton, Wai Rilau, 150 m, 26 iii 1937, leg. J. van der Vecht; Ψ, north-east Sumatra, Deli, Laut Tador, 90 m, 15 i 1951, leg. R. Straatman. Malaysia: Ψ, Johor, Panti Forest Reserve, swamp forest, 5 viii 2006, leg. C.Y. Choong, coll. Choong; ɗ, 2 ΨΨ, Sarawak, Kuching division, Kuching, Sama Jaya Nature Reserve, disturbed low pH swamp forest, 11 iv 2006, leg. R.A. Dow, coll. R.A. Dow; 2 ɗɗ, 2 ΨΨ, same location, 22 ii 2008, leg. R.A. Dow, coll. Dow.

Remarks. The material from Sarawak listed above represents the first record of A. ecornuta from Borneo. As the measurements of male specimens from Sarawak differ somewhat from those provided by Lieftinck (1940), they are given here. Males: abdomen plus appendages 40–44.5 mm, Hw 23–25 mm. Females: abdomen with ovipositor 42.5– 43 mm, Hw 26.5– 27 mm. In contrast to the other species treated here, A. ecornuta lacks a prominent epiproct.

The genital opening of male A. ecornuta is placed less apically on the sternum of S9 than in the other species considered here, so that the tips of the genital valves fall well short of the sternum of S10 ( Fig. 16 View FIGURES 15 – 17 ). In the other species the tips of the genital valves overlap the sternum of S10 at least to some extent ( Figs. 15, 17 View FIGURES 15 – 17 ). The shape of the genital valves is distinctive, and possibly of some diagnostic value.