ODONATOLOGICA Journal of the Societas Internationalis Odonatologica

Contents Volume 29, Issue 1 2000

Costa, J. M.; De Souza, L. O. Irinue; Santos, T. C. Two new species of Oxyagrion Selys, 1876, with a description of five new larvae (Zygoptera: Coenagrionidae) pp. 1-15. O. pseudocardinale sp. n. (holotype male: Brazil, Minas Gerais, Fazenda da Cachoeira F.F. de Souza, 13-II-1990) and O. sulmatogrossense sp. n. (holotype male: Brazil, Mato Grosso do Sul, Campo Grande, Campus UFMS, 24-XII-1997) are described and illustrated. The larvae of O. basale Selys, 1876: O. haematinum Selys, 1876; O. pavidum Selys, 1876; O. santosi Martins, 1967 and O. sulinum Costa, 1978 are described and illustrated for the first time. Keys are provided for the known Oxyagrion spp. and for the known larvae.

Von Ellenrieder, N. Species composition and temporal variation of odonate assemblages in the subtropical-pampasic ecotone, Buenos Aires, Argentina pp. 17-30. Odonata assemblages present in the ecotone between subtropical forest and pampasic grassland in Punta Lara were characterized and compared. Four pools, one in the forest, 2 in grassland (one within a protected area) and one at the limit of both environments, were sampled during July 1996-June 1998. For each sampling station species richness and diversity were calculated, and were compared through 2 similarity coefficients (Jaccard and Winer). The highest species richness and diversity were registered in the forest, and the lowest in the protected grassland. Cluster analysis showed different schemes according to the similarity coefficient considered; a greater similarity between the forest and intermediate pools (Jaccard coefficient), or a greater similarity between grassland areas (Winer coefficient). Some biogeographical implications are discussed.

Wasscher, M. T.; Bos, F. G. The European dragonflies: Notes on the checklist and on species diversity pp. 31-43. Casing natural geographical boundaries, 130 spp. can be considered as European, though when broader political borders are followed this number rises to 136. In addition 20 exotic spp. have been recorded as a result of accidental importation. The highest diversity, defined by the number of spp. per standard area of 250X250 km2, is found in the Alps, while the lowest diversity occurs in the northern parts of mainland Europe and on some islands. Surprisingly, the Mediterranean region is not as rich in spp. as the central part of Europe. When compared with other continents, it is clear that Europe has the lowest number of spp. However, when compared specifically with areas at the same latitude, the Odon. diversity in Europe is relatively average: somewhat higher than expected in the northern regions, somewhat lower than expected in southern regions.

Wilson, K. D. P. Distributional notes on the genus Rhipidolestes, with descriptions of two new species from South China (Zygoptera: Megapodagrionidae) pp. 45-50.  R. alleni sp. n. (holotype male: Da Ming Shan, Guangxi) and R. cyanoflavus sp. n. (holotype male: Bai Yong, Guangdong) are described from South China. A table and map is provided detailing the distribution of all known Rhipidolestes species and subspecies.

Abro, A. Sperm clusters in Zygoptera (Coenagrionidae, Lestidae, Calopterygidae) pp. 51-56. When within the testicular cyst, individual, immature sperm of Lestes sponsa acquire a cap of periacrosomal material. During passage through the spermiducts and vas deferens, the caps of individual sperm coalesce, producing clusters of sperm under a common cap. In Calopteryx virgo, entire sperm cells become embedded in an extracellular homogeneous substance. The joining substance in both species appear to be derived from decomposed surplus cytoplasm sloughed off from developing spermatids. The epithelial lining of the spermiducts adds secretions to this. Clustering of sperm cells was not demonstrated in species of the Coenagrionidae.

Bedjanic, M. Description of the last larval instar of Epophthalmia vittata cyanocephala Hagen, 1867 (Anisoptera: Corduliidae) pp. 57-61. The ultimate instar larva is described and figured from exuviae, collected near Anuradhapura, Sri Lanka. Our present knowledge of the larval forms of the genus is briefly discussed.

Karube, H. Microgomphus jurzitzai spec. nov., a new dragonfly from southern Vietnam (Anisoptera: Gomphidae) pp. 63-65. The new sp. is described and illustrated from 2 male. Holotype male: Lamdong prov., Bao Lok to Ho-Chi-minh Rd, 15-VI-1996; deposited in Author's institution. It is similar to M. loogali Fraser, from northern Burma, from which it is easily distinguished by the longer inner superior appendages, and by strongly bent, bifid inferior appendages. This is the first member of the genus recorded from Vietnam.

Tennessen, K. J. Micrathyria sympriona spec. nov., a new dragonfly from Ecuador and Peru (Anisoptera: Libellulidae) pp. 67-73. The new sp. (holotype male, allotype female: Ecuador, Zamora Chinchipe prov., grassy marsh 5.5 km SE of Zamora, ca 3000 ft, 4degree10'S, 78degree56'W, 5-XI-1997; deposited at FSCA, Gainesville, FL, USA) is described and compared with M. hypodidyma Calvert. M. sympriona differs in the low, laterally rounded transverse ridge on the venter of abdominal segment 1 which bears 0 to 3 widely spaced black denticles on each side of the median depression, the tips of the outer arms of the hamules surpassing the anterior laminae, and segment 9 all black. Females have abdominal segment 9 sternite convex instead of flat as in M. hypodidyma.

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