|Cordulegaster is a genus of dragonfly
in family Cordulegastridae. It contains 26 species.
Cordulegaster diadema (Selys, 1868)
is found in Costa Rica, Guatemala, seven states in Mexico and three southwestern
states in the United States of America. C. diadema occurs in many small
populations scattered over a rather large range; the population trend remains
unknown. Small populations of C. diadema in the United States appear secure
from threats. However, Mexican and Central American populations are poorly
known and continuing deforestation of cloud-forest zone could present a
threat there in the future. IUCN Red List accessed as Least Concern. This
species is thought by most workers to include Cordulegaster godmani, usually
considered a distinct subspecies.
This is a apecies of very large size.
Body length 76 - 78 mm. Male abdomen length 58 mm, female abdomen
length 61 mm, female hindwing length 52 mm.
Face dark brown, eyes green and meeting at a point.
Thorax with two bold yellow stripes.
Abdomen black with yellow bands and spots.
Similar to male.
The species has accepted subspecies
Cordulegaster diadema diadema (Selys, 1868)
Cordulegaster diadema godmani (McLachlan, 1878), sometimes as Cordulegaster
godmani (McLachlan, 1878)