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Hogna wolf spider (family Lycosidae) showing the enlarged posterior median eyes typical of the family. The eyes of spiders vary significantly in their structure, arrangement, and function. They usually have eight, each being a simple eye with a single lens rather than multiple units as in the compound eyes of insects. The specific arrangement ...
English: A diagram of the CT (canoe type) secondary eye in spiders 1: lens 2: vitreous layer 3: visual cells 4: rhabdomeres (light-sensitive component of the visual cells) 5: tapetum 6: retina 7: optical nerve
Eyes: The basic number of eyes is eight, typically arranged in two rows (e.g. as in Gnaphosidae); the front row are the anterior eyes, the row behind the posterior eyes; the four eyes to the edges are the lateral eyes, the four eyes in the centre the median eyes; the anterior median eyes are called the main eyes or direct eyes, while the other ...
Most external appendages on the spider are attached to the cephalothorax, including the eyes, chelicerae and other mouthparts, pedipalps and legs. Like other arachnids, spiders are unable to chew their food, so they have a mouth part shaped like a short drinking straw that they use to suck up the liquefied insides of their prey.
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The invasive Joro spider has been spotted in Pennsylvania as it continues to spread in the U.S. The giant species was first seen in Georgia a decade ago.
Their eye pattern is the clearest single identifying characteristic. They have eight eyes, as illustrated. [3] [4] Most diagnostic are the front row of four eyes, in which the anterior median pair are more dramatically prominent than any other spider eyes apart from the posterior median eyes of the Deinopidae. There is, however, a radical ...
The giant huntsman spider is the largest member of the family Sparassidae, boasting a 30 cm (12 in) leg-span, and 4.6 cm (1.8 in) body-length. [2] The largest known member of the Sparassidae known prior to the discovery of H. maxima was the Australian Beregama aurea (L. Koch, 1875) with a body length of about 4 cm (1.6 in). [ 5 ] (