Psychotic disorders are severe mental disorders that cause abnormal thinking and perceptions. People with psychoses lose touch with reality. Two of the main symptoms are delusions and hallucinations.
How many dragonfly species are there? Answer: The actual number of described species of Suborder Anisoptera (dragonflies) at this time is 2,874. The Suborder Zygoptera (damselflies) consists of about 2,698 species, and the Suborder Anisozygoptera contains only 2 species. Thus, there are 5,574 recognized species of odonates at the present time.
Dragonflies come in many sizes. The average size of a dragonfly is from 1 to 4 inches in length. In prehistoric times dragonflies were much larger - the largest flying insects ever. The largest member of extinct dragonflies had a wing span of about 70-75 cm or about 30 inches.