Monday, September 6, 2010

Spider on Tanzania stamps 1994

The Spider species on stamps has been issued by Tanzania on 1994. The Spider or order Aranea is air-breathing arthropods that have eight legs, and chelicerae with fangs that inject venom. Spiders are found worldwide on every continent except for Antarctica, and have become established in nearly every habitat with the exception of air and sea colonization. The stamps have featured Micrommata rosea, Micrathena, Araneus diadematus , Araneus,Trombidium, Eurylpelma and Salticus species.

Micrommata rosea, synonyms with Micrommata virescens, or called as “The green huntsman spider” is a spider of the family Sparassidae. Due to does not build a web, they have well camouflaged when hunts insects in green vegetation.

Micrathena is the spider genus which has more than hundred species, most of them Neotropical woodland orb-weavers.

Araneus diadematus or the European garden spider lives in Western Europe, North America, and New England. Individual spiders' colouring can range from extremely light yellow to very dark grey, but all this spiders have mottled markings across the back with five or more large white dots forming a cross. The third pair of legs of garden spiders is specialized for assisting in the spinning of orb webs. These spiders also use them to move around on their web without getting stuck. These legs are useful only in the web and its contrary if they are in the ground.

Araneus is a genus of orb-weaving spiders including the European garden spider and the barn spider. In females, the epigyne has a long scape (a tongue-like appendage). Male pedipals have a hook-like terminal apophysys. Abdominal tubercles are present anterolaterally.

Trombidium is a genus of mite that divided in to 30 species. The best known is the Palearctic T. holosericeum. Mites caused several forms of allergic diseases, including hay fever, asthma and eczema and are known to aggravate atopic dermatitis. Mites are usually found in warm and humid locations, including beds. It is thought that inhalation of mites during sleep exposes the human body to some antigens that eventually induce hypersensitivity reaction. Dust mite allergens are thought to be among the heaviest dust allergens.

Eurypelma sp is Tarantula species.The most common North American tarantula is Eurypelma californicum, which is found in California, Texas, and Arizona. A 30-year life span has been recorded for one individual of this species.

Salticus is a spider genus of the Salticidae family (jumping spiders).It is typically marked with a black and white pattern, with some featuring transverse stripes, often gaining them the popular name "zebra spiders". Mature males have very long chelicerae on which they rest their long, thin pedipalps. Females are from 3.5 to 7 mm long, males up to 5 mm. Salticus are often found on rocks and tree trunks, where the sun can reach. This species distributed in the Mediterranean region, South Asia, South Africa.

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