A new species of Crenigomphus is described and illustrated from a type series of eight males and eight females, all collected along the Okavango River in Namibia during December 2004, three non-type adult specimens and several exuviae (holotype ♂ Namibia, N’Kwazi Lodge, 19 xii 2004, deposited at NMNW). Both sexes lack foliations at S8-9 as…
From 12 to 25 August 2009, the odonate fauna of Santo Antão, Cape Verde was surveyed by recording adults and collecting larvae and exuviae at 26 localities, mostly situated in the northwest of the island. Based on the results of this survey and literature data on the Cape Verdes it appears that the resident odonate…
During a period of nine years, from 2000 to 2008, two consecutive studies—one focusing on observations of adult Odonata, the other on collection of larvae—were carried out in the basin of the Guadiamar River in the southwestern Iberian Peninsula. In addition to monitoring Odonata, several environmental variables were assessed, including an index based on macroinvertebrate…
Castoraeschna corbeti sp. nov. is described and diagnosed based on four males (holo- type: Brazil, Para State, Floresta Nacional de Carajás [6°06′13.9″S, 50°08′13.1″W, ca 600 m a.s.l.], 28 ix 2007 to be deposited in Museu Nacional, Universidade Federal do Rio de Janeiro, Rio de Janeiro). This species is similar to C. longfieldae and C. coronata…
Brachythemis leucosticta was found to include two morphotypes, which we consider to represent separate species. Males are separable by the ventral structure of S8 and often differ in the colour of the venation and genital lobe. Females are as yet not reliably distinguishable. Examination of 1,154 males demonstrated that both species are widespread: the true…
Austroaeschna ingrid, a new telephlebiid from the Grampians in Victoria, Australia, is described (holotype: McKenzie Falls, 21-23 January 2008, to be deposited in Museum of Victoria, Melbourne). This species is most similar to A. Christine, A. multipunctata and A. obscura but may be distinguished by the length and slenderness of the male anal appendages, particularly…
Of the many Zygopteran genera that occur in the Neotropics, only five (Hetaerina, Archilestes, Lestes, Argia, and Ischnura) are represented north of 40°N in North America, and only three of these (Hetaerina, Archilestes, and Argia) probably had a tropical origin. In the two genera of Lestidae (Archilestes and Lestes) the life history of temperate-zone populations…
In a large population of Lestes viridis inhabiting a complex, extended system of channels in the floodplain of the Upper Rhine River near Weisweil (Baden-Württemberg, Germany) detailed samples of exuviae were collected from several subpopulations. For each sample the sex ratio was determined. For statistical reasons only samples with at least 700 exuviae were considered.
Examination of diagnostic features for all known species of Acanthagrion and Oxyagrion shows color pattern alone not to be a reliable diagnostic character. Both genera are redefined based on morphological characters, and some color pattern characters which further aid in their diagnoses. A preliminary phylogenetic analysis indicates both genera are monophyletic. They are distinguished from…
Male, female and larva of Neocordulia caudacuta sp. nov. (holotype: Río Castaño, Aragua State, Venezuela; 21 vi 2007; deposited in MIZA) are described and illustrated. The new species belongs in the subgenus Mesocordulia. Male N. caudacuta differs from N. batest in details of hamule and penis, and in possessing a sharp, erect dorsomedian spine on…