Banded garden spider (Argiope trifasciata)
Banded garden spider (Argiope trifasciata), female head downwards on the web, the characteristic posture. It occurs worldwide. It builds a vertical wheel web about 60 cm across. West MacDonnell National Park, Northern Territory, Australia
© Michael Maconachie/AUSCAPE All rights reserved
Animal, Animals In The Wild, Arachnid, Arachnida, Araneae, Araneidae, Araneomorph, Argiope, Arthropod, Backlit, Black And Yellow Garden Spider, Carnivore, Central Australia, Cobweb, Cosmopolitan, Diurnal, Fauna, Female Larger, Full Length, Garden Spider, One Animal, Orb Weaver, Predator, Sexual Dimorphism, Sexually Dimorphic, Silk, Spider, Wildlife
Coloured SEM of head of the Zora spinimana spider
Common garden spider. Coloured scanning electron micrograph (SEM) of the head of a common garden spider, Zora spinimana. The spider's eight eyes (upper centre) are clearly seen here as rounded bumps. Below the eyes are two large chelicerae which carry teeth for biting prey. Next to the chelicerae are the spider's pedipalps. This spider is extremely common in European gardens. It inhabits moss and grasses especially in damp places. The egg sac is found in summer near ground level. The egg sac has no outer covering so the female will guard it under a dried leaf or a stone. Magnification: x9 at 6x6cm size. Magnification: x22.5 at 7x6.5ins size.
© POWER AND SYRED/SCIENCE PHOTO LIBRARY
Web of spider exposed to caffeine
Effect of caffeine on spiders. Computer artwork of the orb web of a garden spider (Araneus diadematus) exposed to caffeine. Caffeine is a plant alkaloid found naturally in foods such as coffee beans, tea, kola nuts and cacao beans. A normal orb web consists of radiating threads and a sticky spiral hub (see Z430/519). A spider fed on caffeine-dosed flies produces an erratic and incomplete web, with many parts completely absent. Originally published in NASA Tech Briefs, April 1995.
© NASA/SCIENCE PHOTO LIBRARY