DS1 Arachnida Fall 2015

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Note on collected specimen in photo: Photo is of the ventral side of the spider. Spider contained intermittent long white and dark colored spiny hairs. The overall color of the thorax and abdomen is blackish brown. The legs are banded in black/dark brown and white stripes which also contained spiny hair like projections. It had four visible pairs of compound eyes (large anterior median eyes, small anterior lateral) and the overall size of the specimen was no more than 4mm. The eye pattern, overall physical appearance, and shape were clues that the spider may belong to the Salticidae family (commonly referred to as a jumping spider).

Location of collection: Downstream location Latitude 33° 97'79.56N/ Long: 84° 01'97.25W

Date of collection: August 28, 2015

Shannon-Wiener Index of Biodiversity: H’ 2.64

Order/Family of collected specimen: Araneae (most likely in the Salticidae family)

Distinguishing morphological features of Order Araneae: Segmented bodies (cephalothorax, thorax and abdomen). Cephalothorax and Thorax contain: Chelicerae (contains fangs among other functions), Pedipalps (uses include sensory and for the transfer of sperm in males), eyes (usually 8 with the exception of a few species with only 6, such as the brown recluse), Legs (8 on all Araneae orders),

Geographical Distribution of Araneae: Widely distributed around the world except in the Arctic

Life cycle of Araneae: The majority of spiders live no more than one or two years, however, larger species have been known to live decades longer, especially in captivity.

Diet: Insects, although some very large species of arachnids can consume small mammals and birds. Spiders need to liquefy food before consumption this is done in a variety of ways but most can inject digestive fluids then siphon out the innards of the prey.

Habitat of Araneae: Live in a variety of habitats however many species have little tolerance for excessive cold most species physically can’t tolerate movement from native habitat

Ecological Importance: Araneae are crucial towards the control of insect populations

Economic/agricultural/human health importance: Araneae are also important in areas of agriculture, economic and human health due to their efficacy in controlling insects that spread disease and illness. Most Araneae do not pose a threat to human health particularly in North America, as very few species contain venom which is medically significant to humans.

Collector/Contributor: Holly Ertley

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