Platycnemis foliacea sasakii Asahina

Platycnemis foliacea sasakii is Vulnerable with the listing of the species of the wildlife that has the fear of extinction.　Platycnemis foliacea sasakii is few in eastern Japan. However, Platycnemis foliacea sasakii is comparatively many in Western Japan; there is the area where it is seen numerously. This dragonfly inhabits in the river where a plant grows a lot in Hyogo Pref. Also, this dragonfly inhabits in the waterway that a plant grows. The flight period is a July end from the end of May.

Male of Platycnemis foliacea sasakii　There is ' sumo' referee's fan form white part in the middle leg, hind leg of a male.

Emaergence of the male of Platycnemis foliacea sasakii	Exuvia　Caudal gill smaller than Copera annulata although it is big

Oviposition	Platycnemis foliacea sasakii lays eggs to the stalk, the leafstalk of the plant of underwater

State of the change of an egg　An egg period differs with water temperature. The average egg period is 16 days from 11 days. 1：The 2nd day after oviposition 2：The 6th day after oviposition 3：The 8th day after oviposition 　4：The 9th day after oviposition 5：The 13th day after oviposition　

Hatching 　From several hours before a prolarva appears from an egg the anterior part of an egg begins to grow. A prolarva appears from the egg, after the anterior part of the egg grew. And a first instar larva appears from the prolarva.　1：Ten minutes before the prolarva appears 　2，3：Prolarva appears to the anterior part of the egg 4：Prolarva comes out from the egg 5：Prolarva

6：Back of the thorax of the prolarva swells out 7，8，9：First instar larva appears from the prolarva

First instar larva 　The first instar larva of Platycnemis foliacea sasakii is colorful and have the small protrusion with roundness to the head. 　Size Length:1.22 mm Head width :0.35 mm Length of the antenna :0.38 mm Length of the lateral gill :0.93 mm