EJE, vol. 92 (1995), issue 3

Fifteenth European Colloquium of Arachnology.


Eur. J. Entomol. 92 (3): 521, 1995


Web construction patterns in a range of orb-weaving spiders (Araneae)


Eur. J. Entomol. 92 (3): 523-541, 1995

We present and compare the spatial and temporal patterns of the capture web-building behaviour in different species from a range of orb weaving and non-orb weaving genera.

Respiratory cycles of Chelifer cancroides (Pseudoscorpiones) and Galeodes sp. (Solifugae)


Eur. J. Entomol. 92 (3): 543-552, 1995

Respiratory functions have been monitored by microrespirographic scanning method in immature and adults of Chelifer cancroides (L.) (Pseudoscorpiones) and male adults of wind scorpions Galeodes sp. (Solifugae). Both species exhibited a more or less continuous respiratory pattern with relatively constant, acyclic CO2 output and CO2/O2 ratio of 0.72-0.73 under conditions of high relative humidity, and during feeding or intensive locomotion. Conversely, under dry environmental conditions, during starvation or arrested locomotion while watching for prey, both pseudoscorpions and much larger wind scorpions...

Drapetisca socialis (Araneae: Linyphiidae): Web reduction - ethological and morphological adaptations


Eur. J. Entomol. 92 (3): 553-563, 1995

The linyphiid spider Drapetisca socialis (Sundevall, 1832) attaches a specialized web vertically to tree trunks: A small sheet is surrounded by signal threads that inform the spider about passing arthropods. Field observations of prey composition revealed the importance of Collembola, especially Sminthuridae, as prey items. As can be seen from video recordings, D. socialis catches prey by a special technique, which is also employed outside the web. The spider moves carefully over its victim, which is grasped from above by means of modified chelicerae and pedipalps. They carry a setal trap, that is unique among linyphiid spiders (in spiders...

Embryonic and postembryonic morphogenesis of the visual, venom- and silk-gland systems in two species of Peucetia (Araneae: Oxyopidae)


Eur. J. Entomol. 92 (3): 565-571, 1995

Morphogenesis and organogenesis were followed in two oxyopid spiders, from egg to spiderling leaving the egg sac. Attention has been paid especially to development of the visual, venom- and silk-gland systems, given that these three systems are functionally implicated in the behaviour of spiders. Chronology of development differs between systems: at the time of emergence, visual and silk-gland systems seem to be functional, while venom glands, together with the digestive tract, are not. This can be correlated with the positive phototaxis and aggregative behaviour of spiderlings.

The role of soil predators in decomposition processes


Eur. J. Entomol. 92 (3): 573-580, 1995

There is a limited number of papers which deal with the significance of predation in the decomposer food chain. Microcosm experiments conducted in order to examine the role of predatory microfauna (Protozoa, Nematoda) showed that they increase the rate of decomposition of organic material and enhance the mineralization rate of nitrogen and phosphorus.

Experimental results on the importance of larger predators, belonging to the meso- and macrofauna (Acarina, Araneae, Carabidae, Formicidae) were less consistent. In most cases ii was found that they can retard the process of organic matter decomposition and contribute to system stabilization. However,...

A review of the family Agelenidae (Araneae) in Bulgaria. Taxonomic, faunistic and zoogeographical analysis


Eur. J. Entomol. 92 (3): 581-588, 1995

The family Agelenidae (sensu Maurer, 1992) is represented in Bulgaria by 35 species, included in 10 genera (Agelena 3, Cicurina 1, Coelotes 8, Cryphoeca 2, Cybaeus 2, Histopona 3, Lycosoides 1, Maimunn 1, Tegenaria 12, Textrix 1, Tuberta 1). This number was established after a taxonomic revision of all available collections containing agelenid spiders in Bulgaria. One new record is also added (Tegenaria zirzulusensis Dresco).

Species of the family Agelenidae are distributed in all districts in Bulgaria, occurring in lowland, forest, mountains, caves and buildings...

The genus Mogrus (Araneae: Salticidae) of Central Asia


Eur. J. Entomol. 92 (3): 589-604, 1995

The genus Mogrus is redefined and diagnosed. Four species of Mogrus are recorded from the former Soviet Central Asia and one from adjacent regions of the Caucasus: M. antoninus, M. larisae sp. n., M. neglectus, M. valerii and Mogrus sp. A key and distributional maps are provided.

Twig-lining in a trapdoor spider Latouchia swinhoei (Araneae: Ctenizidae) from Okinawa


Eur. J. Entomol. 92 (3): 605-608, 1995

A twig-lining population of Latouchia swinhoei Pocock, 1901 (Ctenizidae) was found in Okinawa in a habitat also densely populated by other trapdoor spiders (Ryuthela nishihirai, Mesothelae). Specimens were tested in the laboratory for their utilization of objects offered to them for attachment to the rim of the burrow. The behavioural capacity of twig-lining is discussed in comparison with other trapdoor spiders.