ODONATOLOGICA Journal of the Societas Internationalis Odonatologica

Contents Volume 31, Issue 1 2002

Belle, J. Commented checklist of the Odonata of Surinam p. 1-8. A list is given of 283 spp. and sspp., referable to 87 genera of 15 families. Some additional taxa are evidenced but remain unidentified. Notes are supplied on some spp.; Hetaerina cruentata (Ramb.), Argia extranea (Hag.), Phyllocycla signata (Hag.), Phyllogomphoides audax (Hag.), Dythemis sterilis Hag., D. velox Hag., Erythrodiplax attenuata (Kirby), E. ochracea (Burm.), E. aequatorialis Ris and Perithemis waltheri Ris are deleted from the national list.

Beukema, J. J. Survival rates, site fidelity and homing ability in territorial Calopteryx haemorrhoidalis (Vander Linden) (Zygoptera: Calopterygidae) p. 9-22. In a small isolated population along a small stream in NE Spain, a high proportion of the adults present were individually marked. During subsequent days, their locations were assessed by twice-daily surveys along the entire length of the stream. Mean daily survival rates in mature males and females and pre-reproductive males were similar, 94%. Only during the first day after marking were survival rates significantly lower (viz. 77 to 84% in the various groups). High proportions (around 90%) of mature males were found to return to the same (territory) site every morning once they had occupied that site for 2 or more days. Site fidelity was low in pre-reproductive males and intermediate in mature females. In a displacement experiment, 67 territorial males were transferred one by one to distant locations (80 to 240 m along the stream). Half of them returned to their original territory, usually on the same day.

Carvalho, A. L.; Werneck-De-Carvalho, P. C.; Calil, E. R. Description of the larvae of two species of Dasythemis Karsch, with a key to the genera of Libellulidae occurring in the states of Rio de Janeiro and Sao Paulo, Brazil (Anisoptera) p. 23-33. The ultimate instar larvae of D. mincki and D. venosa are described and illustrated, based on material from SE Brazil, and general notes on the breeding habitats are provided. A preliminary key to the genera of Libellulidae larvae occurring in the region is appended.

Novelo-Gutierrez, R. Larvae of the ophibolus-species group of Erpetogomphus Hagen in Selys from Mexico and Central America (Anisoptera: Gomphidae) p. 35-46. Detailed descriptions and illustrations of Erpetogomphus agkistrodon Garrison, E. erici Novelo and E. ophibolus Calvert are provided and a comparison with other larvae of the subgenus Erpetocyclops Carle is also included. Larvae of E. agkistrodon and E. erici show the closest resemblance, while E. ophibolus is more similar to E. constrictor.

Tembhare, D. B.; Wazalwar, S. M. Stomodeal cuticular structures in the dragonfly Brachythemis contaminata (Fabricius) (Anisoptera: Libellulidae) p. 47-54. Light and scanning electron microscopic studies reveal various stomodeal cuticular structures. In the larvae and adults, microspines on the surface of the longitudinal folds of the pharynx, and dome-shaped, beaded structures on the inner surface of the oesophagous are evident. In the larvae, the folds of the crop bear long hairs laterally and parallel rows of microspines medially. In the larvae, the proventriculus is provided with 4 longitudinal plates; 2 large plates with teeth on each lateral side and 2 small plates each with 4 fine apical teeth, on either side. Scale-like acanthae are observed near the stomodeal valve. A whorl of long hairs is evident in the stomodeal valve. In the adult dragonfly, the acanthae and curved spines occupy the anterior and posterior regions of the proventricular dental plates, respectively. The functional significance of various stomodeal cuticular structures is discussed.

Wildermuth, H.; Knaus, P. The impact of incidental summer snowfall on two Alpine metapopulations of Somatochlora alpestris (Selys) (Anisoptera: Corduliidae) p. 55-63. In the course of a 2-yr mark-resighting study on S. alpestris at 2000 m a.s.l. in the Central Alps of Switzerland snow fell during the beginning of the reproductive period in July 2000. The snow cover was up to 30 cm thick and remained for about 8 days. Only 3% of the individuals marked as tenerals and 4% of those marked as matures before the cold spell were resighted afterwards. In 1998 (a season without snow) the corresponding resighting proportions amounted 10% and 54% respectively. In 2000, at a second study site at 1700-1800 m, 11% of the individuals marked as matures before the cold spell were found again. It is concluded that, unlike the aquatic stages, the imagines of S. alpestris are not well adapted to survive cold periods with snowfall lasting more than a few days. Various survival strategies focused on egg and larval development of the sp. are discussed with respect to adaptation to a subarctic climate.

Wilson, K. D. P. Notes on Chlorogomphidae from southern China, with descriptions of two new species (Anisoptera) p. 65-72. Chlorogomphus shanicus sp. n. and Chloropetalia soarer sp. n. are described and illustrated from north Guangdong, China. Chlorogomphus icarus Wilson and Reels is synonymised with C. usudai Ishida and C. papilio Ris is illustrated.

Daigle, J. J. Telebasis gigantea spec. nov. from Bolivia (Zygoptera: Coenagrionidae) p. 73-76. The new sp. is described and illustrated (holotype male: Santa Cruz dept., Ichilo prov., Buena Vista, Feb. 2000; allotype female: same data as holotype). Holotype deposited in Universidad Autonoma "Gabriel Rene Moreno" (U.A.G.R.M.) in Santa Cruz, Bolivia; allotype deposited in Gainesville, Florida, USA. male and female can be distinguished by their very large size, dull gold thorax, and facial color which is sky-blue in male but yellowish-blue in female.

Perepelov, E.; Bugrov, A. G. Constitutive heterochromatin in chromosomes of some Aeshnidae, with notes on the formation of the neo-XY/neo-XX mode of sex determination in Aeshna (Anisoptera) p. 77-83. C-stained male karyotypes of Aeshna crenata (2nmale=27; X0), A. grandis (2nmale=26; neo-XY), A. juncea (2nmale=26; neo-XY), A. nigroflava (2nmale=27; X0) and Anax imperator (2nmale=27; X0) from W Siberia, N Caucasus, Russian Far East and Hokkaido (Japan) are figured and analyzed.

Weihrauch, F.; Borcherding, J. The zebra mussel, Dreissena polymorpha (Pallas), as an epizoon of anisopteran larvae (Anisoptera: Gomphidae, Corduliidae, Libellulidae) p. 85-94. A list of records of anisopteran larvae and final instar exuviae with attached zebra mussels is provided. It contains records of 29 specimens from 10 spp. with zebra mussels including 2 new records. The possibilities how this association between odonate larvae and zebra mussels comes into being are discussed. Considering the biology and the life history of the mussels, from a few of the recorded cases of this interaction it is assumed that the larval development of the Odonata involved is more variable than hitherto known.

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