ODONATOLOGICA
Volume 29, Issue 4
2000
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ODONATOLOGICA |
| Contents Volume 29, Issue 4 2000 |
| Cordoba-Aguilar, A. Reproductive behavior of the territorial damselfly Calopteryx haemorrhoidalis asturica Ocharan (Zygoptera: Calopterygidae) pp. 295-305. The reproductive behavior of C. h. asturica is described. Males fought with each other for the possession of territories which contained the oviposition resource required by females. Females arrived at territories and either copulated and left the territory, copulated and oviposited in that territory or oviposited without a preceding copulation with the territorial male. Territorial males seemed to have a higher mating success than nonterritorial males. Males carried out courtship displays before and after copulation until females finished oviposition. Copulation was divided in two stages which were characterized by the nature of the male's abdominal flexions. The number of abdominal flexions during stage I and II was 50.2 +- 7.2 and 54.5 +- 16.7 (mean +- s.d.) respectively. The sexual behavior of both sexes is discussed under current knowledge of sexual selection studies in Calopterygidae. |
| Watanabe, M.;
Taguchi, M. Behavioural protandry in the damselfly Mnais pruinosa costalis Selys in relation to territorial behaviour (zygoptera: Calopterygidae) pp. 307-316. The reproductive strategy of the male M. p. costalis can be defined as an attempt to maximize the number of females mated. Males exhibit wing colour dimorphism: one form has orange wings, and the other has hyaline wings which resemble female wings. The former is usually territorial and the latter uses sneaky mate securing tactics around the territories of orange-winged males. Although the length of the emergence period varied from year to year, no evidence of protandry was observed. Studies over 10 years have shown that if the length of the sexually active period in females is stable, the orange-winged males should become sexually mature before females do to achieve maximal reproductive success. On the other hand, the hyaline-winged males do not mature before females due to the fact that they utilize the territories of orange-winged males. This study shows that behavioral protandry should be considered a reproductive strategy of the orange-winged males for establishing territories. |
| Bede, L. C.;
Piper, W.; Peters, G.; Machado, A. B. M. Phenology and oviposition behaviour of Gynacantha bifida Rambur in Brazil (Anisoptera: Aeshnidae) pp. 317-324. On 2 evenings in late Oct. 1999 several females were observed laying eggs in almost dry mud and sand and under mosses, within a temporary pond system, surrounded by rain forest, nr Tiradentes, Minas Gerais, Brazil. The ponds are filled with water during the rainy season (Oct. - March) but dry up entirely by the end of the dry season (Aug. - Sept.). Data compiled from field records, odonatological collections and literature showed that in Brazil G. bifida stays on the wing throughout the year. Apparently, the sp. possesses a univoltine life cycle with 2 generations of larvae, one during the warmer rainy season and another in the early dry season (Oct./Nov. - Jan./Feb. and Feb./March - May/June, respectively). Mud attached to the terminal abdominal segments of female specimens in odonatological collections was used as an evidence of an oviposition mode comparable to that observed in the field. |
| Daigle, J. J. Metaleptobasis mauffrayi spec. nov. from Equador and Peru (Zygoptera: Coenagrionidae) pp. 325-328. The new sp. is described from Ecuador (holotype male: Napo Province, Parque Nacional Yasuni, July 1996; allotype female: Napo Province, Parque Nacional Yasuni, November 1997; both deposited in FSCA, Gainesville, FL, USA). Males can be distinguished by the long cerci, subequal to epiprocts. |
| Martens,
A. Group oviposition in Coenagrion mercuriale (Charpentier) (Zygoptera: Coenagrionidae) pp. 329-332. Pairs aggregate during oviposition. Discrimination experiments with pairs of floating leaves of Berula erecta show that tandems land preferentially on leaves where a single motionless male in the typical vertical position of a tandem male is present. |
| Capitulo, A.
Rodrigues Population dynamics of larval stages of Tauriphila risi Martin and Erythemis attala (Selys) in Punta Lara gallery forest, Buenos Aires, Argentina (Anisoptera: Libellulidae) pp. 333-340. Larval populations of the 2 spp. were studied in a lentic freshwater environment. 13 larval instars were recognized from plots of head width and length of wing-pads. Density, population dynamics, age structure, flying period and winter quiescence were analysed. Both uni- and semivoline individuals were found. Microhabitat differences were found between the 2 spp, T. risi preferring Pistia stratiotes and Hydrocotyle ranunculoides, whereas E. attala preferred lemnaceas. A life table was constructed for T. risi, which showed mortality rate maxima at hatching and at 10 and 23 months. |
| Babu, B. Suri Description of the larva of Neurothemis intermedia (Rambur), with notes on biology (Anisoptera: Libellulidae) pp. 341-346. The morphology of the final instar larva is described and illustrated, based on exuviae and larvae from Sagar, Madhya Pradesh, India. Notes on the larval habitat, life history pattern and emergence are added. |
| Von
Ellenrieder, N. Aeshna tinti spec. nov. from Chile and redescription of A. elsia Calvert (Anisoptera: Aeshnidae) pp. 347-358. A. tinti sp. n. is described and illustrated from the Chilean Tarapaca and Antofagasta regions (holotype male and allotype female: Chile, Antofagasta, El Loa prov., Tilopozo, 23degree49'S 68degree15'W, I-1996; deposited at MLP, Argentina). A redescription and drawings of A. elsia Calv. are provided, as well as a comparison of the new sp. with all the sympatric Aeshna spp. |
| Wazalwar, S. M. ;
Tembhare, D. B. Innervation of mouthpart sensilla in the dragonfly Brachythemis contaminata (fabricius) (Anisoptera: Libellulidae) pp. 359-364. Neuroanatomical studies demonstrate single dendritic innervation of trichoid sensilla, basiconic sensilla and microtrichia, and multidendritic innervation of the papillae and sensory pegs. These sensilla can therefore be considered as mechano- and chemo-receptors respectively. The campaniform sensilla are innervated by several dendrites and many function as proprioceptors. No innervations of the spines, teeth, hooks and acanthae was observed suggesting non-sensory nature. |
| Zhu,
H.-Q.; Ou-Yan, J. Coenagrion bifurcatum spec. nov., a new damselfly from Heilongjiang, China (Zygoptera: Coenagrionidae) pp. 365-368. The new sp. (holotype male and allotype female: Mao-er shan, Dong-ling, Heilongjiang, China, 15-VII-1999; deposited at Heilongjiang Nonken Teachers' College, Achen) is described, illustrated and compared with hylas. |
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