دانلو پاورپوینت آماده درسی و دانشگاهی

نام فایل : بيولوژي ،اكولوژي كژدم ها وپيشگيري از گزش آنها

فرمت : .ppt

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بنام خداوند جان و خردبيولوژي ،اكولوژي كژدم ها وپيشگيري از گزش آنها
D.R.D
Scorpions, which are grouped in the phylum Arthropoda .
scorpion has a flattened elongated body and can easily hide in cracks.
scorpion has a segmented tail that has a poisonous spike at the end.
Scorpion stings are a major public health problem in many underdeveloped tropical countries, especially Africa, South India, the Middle East, Mexico, and South Latin America.

The estimated annual number of scorpion stings is 1.2 million.

An estimated 5000 deaths occur annually from scorpion stings worldwide

Distribution
Scorpions have a world-wide distribution, being found in deserts, grasslands, forests, intertidal zones (coast) and mountains. 
World distribution of scorpions
Size of scorpions
The average size of a scorpionid is 3 to 9 cm. 
The largest forms are the African genus Pandinus which reaches 18 cm, and Hadogenes spp which measures 21 cm long and weighs 32 grams. 

Some Carboniferous scorpions are known to have attained lengths of 44 to 86 cm or even a meter.

Pandinus imperator King of the Scorpions
Probable reasons for development of venom in scorpions
Food acquisition
A-Venom can be an effective tool for predators.
B-A second advantage of venom is that in many venom, enzymes are a major constituent.
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