|Sympetrum dilatatum (Calvert, 1892),
the St. Helena Darter (Sympetrum dilatatum) is a species of dragonfly in
family Libellulidae. It is endemic to Saint Helena where the last specimen
recorded was in 1963. The species is assumed to be extinct.
The St. Helena Darter is endemic
to St. Helena Island and is known only from St. Helena. There are very
few published records. The type series (four males, one female) was collected
during the U.S. Solar Eclipse expedition between 20th February and 10th
March 1889-1890. The last known record, a female, was collected at Green
Hill in October 1963. Because there were no records since then the species
was assessed as Extinct. However, there was never a systematic survey for
the species not before and particularly not since the last record. There
is also not aware of any entomological survey, which may have paid attention
to the species. Thus, although the likelihood is high that the species
is now Extinct it is unable to exclude that populations still remain. Because
of the insufficient surveying during the last 50 years, the current accessment
by IUCN Red List on this species is Data Deficient rather than Critically
Endangered (possibly extinct).
The specimen record of the species
length at 30mm and 36mm, meaning they are one of the largest species in
the genus Sympetrum.