Protrusion like the horns of other species

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Mortonagrion selenion (Ris) Coenagrionidae

There are few species with a protrusion like the horn with Coenagrionidae.

Platycnemis echigoana Asahina Platycnemididae

Many species of Platycnemididae are seem to have a protrusion like the horn.

Epophthalmia elegans(Brauer) Corduliidae Cordulia aenea amurensis Selys  Corduliidae
Sympetrum frequens (Selys) Libellulidae Sympetrum kunckeli (Selys) Libellulidae