ODONATOLOGICA Journal of the Societas Internationalis Odonatologica

Contents Volume 29, Issue 2 2000

Costa, J. M.; Santos, T. C. Two new species of Santosia Costa and Santos, 1992 with a description of five new corduliid larvae (Anisoptera: Corduliidae) pp. 95-111. S. machadoi sp.n. (holotype male: Parque Nacional da. Serra da Bocaina, Sao Paulo, Brazil; 25-II-1977) and S. newtoni sp.n. (holotype male: Brejo da Lapa, Itatiaia, Rio de Janeiro, Brazil; 19-II-1974) are described and illustrated along with their exuviae. The exuviae of Aeschnosoma marizae Santos, Neocordulia androgynis (Sel.) and N. setifera (Hag.) are also described and illustrated for the first time. The known Santosia spp. and the neotropical corduliid larvae are keyed.

De Marmels, J. The larva of Allopetalia pustulosa Selys, 1873 (Anisoptera: Aeshnidae), with notes on aeshnoid evolution and biogeography pp. 113-128. The larva is described and illustrated from four ultimate instar exuviae (2  reared) and from a younger larva, all from Venezuela. Main characters are a pointed epiproct and spinous mesial carinae of paraprocts. There is some general similarity with larvae of Boyeria McL., but the latter have angled occipital lobes, longer labium and, in some species, a bifid epiproct. Penis is strikingly similar in Allopetalia and Boyeria, the "cornua" coming closer to those found in Gomphaeschna Sel. than to the "flagella" as found in the brachytrine Spinaeschna Theisch. and in the austropetaliine Rheopetalia Carle. The "pryeri-group" of Oligoaeschna Sel. is adscribed to Gomphaeschnata LOHMANN (1996, Ent. Z., Essen 106: 209-252), while the "poeciloptera-group" is considered a representative of the archaic Gynacanthini (Aeshnata). Biogeographical problems of Anisoptera, especially those of Gomphaeschnini and Gynacanthini, and of Euphaeida (Zygoptera) are discussed, considering the Pangaea-model and panbiogeographic criteria. Maps and a glossary of some panbiogeographic terms are added.

Westman, A.; Johansson, F.; Nilsson, A. N. The phylogeny of the genus Leucorrhinia and the evolution of larval spines (Anisoptera: Libellulidae) pp. 129-136. A cladistic analysis of the genus Leucorrhinia, based on adult morphological characters, found one most parsimonous tree with a consistency index of 0.35. The evolution of large dorsal larval spines was mapped on the resulting tree. This mapping suggests that the presence of spines is the primitive state within Leucorrhinia and that they have disappeared on five different occasions, or have disappeared twice on lower branches and reappeared three times higher up in the tree.

Yeh, W. C.; Chen, Y. M. Descriptions of two new species of the genus Oligoaeschna from northern Taiwan, with notes on the status of the pryeri-group (Anisoptera: Aeshnidae) pp. 137-150. 2 syntopic new sp. of the pryeri-group Oligoaeschna, O. lieni sp. n. (holotype male: Tsaopi bog, 850m, Yuanshan, Ilan county, northern Taiwan, 11-V-1997) and O. tsaopiensis sp. n. (holotype male: Tsaopi bog, 850m, Yuanshan, Ilan county, northern Taiwan, 11-V-1997) collected from northern Taiwan are named, described and diagnosed. Relationship amongst the members of eastern Asian pryeri-group is discussed and inferred mainly from their male penile structure. With regard to male penile glans structure, the pryeri- group is considered to be the extant sister-group of the nearctic genus Gomphaeschna.

Assis, J. C. F. ; Carvalho, A. L.; Dorville, L. F. M. Aspects of larval development of Limnetron debile (Karsch), in a mountain stream of Rio de Janeiro State, Brazil (Anisoptera: Aeshnidae) pp. 151-155. Quantitative and qualitative samplings performed in a first order mountain stream in the State of Rio de Janeiro, southeastern Brazil, provided 121 larval specimens in the 6 last instars. The total number of larval instars estimated, using Dyar's rule, is 13, based on head width measurements. There was no significant difference between the number of males and females.

Switzer, P. V.; Schultz, J. K. The male-male tandem: A novel form of mate guarding in Perithemis tenera (Say) (Anisoptera: Libellulidae) pp. 157-161. Observations on male-male tandems are reported; these tandems occur at very low frequency during mate guarding sequences. When initiating a tandem, a male territory resident grabs an intruding male behind the head and flies with him. This behavior is similar to the tandem formation more usually associated with male-female pairs. Because the male-male tandems occurred during mate-guarding and because tandems do not follow courtship of the intruder by the resident, this rare behavior is interpreted as a form of mate guarding rather than misdirected mating behavior.

Zhu, H.-q. ; Han, F.-y. Cercion yunnanensis spec. nov., a new damselfly from Yunnan, China (Zygoptera: Coenagrionidae) pp. 163-166. Both sexes are described, illustrated and the new sp. is compared with Coenagrion impar Needham. Holotype male, allotype female: China, Yunnan prov., Zong-dian, 29-VII-1998, deposited at Shanxi University; paratypes of both sexes from same locality and date, deposited at Dali Teachers Training School, Dali, Yunnan, China. This is the eighth member of the genus known from China. The transfer of Coenagrion impar Needham to Cercion is suggested.

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