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The ventral side of a brown widow spider. The epigastric plates and furrow are visible, as well as the hourglass marking on the underside of the abdomen, which is a characteristic feature of widow spiders. The anatomy of spiders includes many characteristics shared with other arachnids.
This image comes from the following images: File:Spider_internal_anatomy.png licensed with PD-US . 2009-06-27T01:33:45Z Kaldari 5000x2500 (10823835 Bytes) {{Information |Description={{en|1=Diagram of the internal anatomy of a two-lunged spider.}} |Source=Scanned from the 1920 edition of ''The Spider Book'', published by Doubleday, Page & Company (originally published in 1912)
The cymbium is a spoon-shaped structure located at the end of the spider pedipalp that supports the palpal organ. [3] The cymbium may also be used as a stridulatory organ in spider courtship. [6] The embolus is a narrow whip-like or leaf-like extension of the palpal bulb.
Pholcus phalangioides, commonly known as the cosmopolitan cellar spider, long-bodied cellar spider, or one of various types called a daddy long-legs spider, is a spider of the family Pholcidae. This is the only spider species described by the Swiss entomologist Johann Kaspar Füssli , who first recorded it in 1775. [ 1 ]
The posterior lateral eyes (PLEs) are wide-angle motion detectors that sense motions from the side and behind. Combined with the other eyes, PLEs give the spider a near 360° view of the world. The anterior lateral eyes (ALEs) have the best visual acuity of the secondary eyes. [12]
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Anasaitis canosus, previously of the genus Corythalia, is a small jumping spider that can typically be found atop leaf-litter or man-made structures such as fences and exterior walls. This species is more commonly known as the twin-flagged jumping spider due to the two pennant shaped markings on the dorsal side of the cephalothorax.