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Documents 137 species and subspecies of Odonata spread over 79 genera, 12 families and 31 subfamilies known to date from Kerala. In many of the scientific literature on Odonata published prior to India's independence, the distributional areas of several species found in Kerala are mentioned as Malabar, Cochin and Travancore, the formerly known princely states/provinces falling partly in the present day limits of the Kerala state. The Malabar area represents currently the Northern Districts of Kerala, falling North of the Palghat gap. Similarly, Cochin represents the present day districts of Trichur and Ernakulam, and Travancore, the districts South of Ernakulam District. Of these 137 species of Odonata, 7 species, Agriocnemis keralensis Peters, Protosticta antelopoides Fraser, Caconeura risi (Fraser), Merogomphus longistigma tamaracherriensis Fraser, Davidioides martini Fraser, Onychogomphus malabarensis (Fraser) and Idionyx rhinoceroides Fraser are endemic to Kerala.
Contents: Preface. 1. Introduction. 2. Biology. 3. Structure of an adult Ononate (Imago). 4. Systematic list of Ononata known from Kerala. 5. Systematic account: i. Key to the suborders of Odonata. ii. Key to the superfamilies of Zygoptera. iii. Key to the families of superfamily Coenagrionoidea. iv. Key to the genera of Family Coenagrionidae. v. Key to the species of Ceriagrion Selys. vi. Key to the species of genus Pseudagrion Selys. vii. Key to the species of genus Aciagrion Selys. viii. Key to the species of genus Ischnura Charpentier. ix. Key to the species of genus Agriocnemis Selys. x. Key to the species of genus Copera Kirby. xi. Key to the genera of Family Platystictidae. xii. Key to the species of genus Protosticta Selys. xiii. Key to the genera of Family Protoneuridae. xiv. Key to the species of genus Caconeura Kirby. xv. Key to the species of Genus Esme Fraser. xvi. Key to the species of genus Elattoneura Cowley. xvii. Key to the genera of Family Lestidae. xviii. Key to the species of Genus Lestes Leach. xix. Key to the families of superfamily Calopterygoidea. xx. Key to the genera of Family Calopterygidae. xxi. Key to the species of Genus Vestalis Selys. xxii. Key to the genera of Family Chlorocyphidae. xxiii. Key to the genera of Family Euphaeidae. xxiv. Key to the species of Genus Euphaea (Selys). xxv. Key to the superfamilies of suborder Anisoptera. xxvi. Key to the families of superfamily Aeshnoidea. xxvii. Key to the genera of Family Gomphidae. xxviii. Key to the species of Genus Merogomphus Martin. xxix. Key to the species of Genus Megalogomphus Campion. xxx. Key to the species of Onychogomphus Selys. xxxi. Key to the genera of family Aeshnidae. xxxii. Key to the species of Genus Anax Leach. xxxiii. Key to the species of Genus.
