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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)
In this spider diagram, the position of the book lungs is labelled 1. Spider book lungs (cross section) Internal anatomy of a female spider, book lungs shown in pink A book lung is a type of respiration organ used for atmospheric gas-exchange that is present in many arachnids, such as scorpions and spiders.
These points may be joined forming a shape like a spider. Joined points represent an "or" condition, also known as a logical disjunction. A spider diagram is a boolean expression involving unitary spider diagrams and the logical symbols ,,. For example, it may consist of the conjunction of two spider diagrams, the disjunction of two spider ...
In all the spider anatomy diagrams in all of my books, including Biology of Spiders, The Spider Book, and Invertebrate Zoology (all of which are scholarly works with countless diagrams), the coxal gland is not illustrated once. I really don't think it's worth removing a leg (and associated parts) to show it.
In addition to preserving spiders' anatomy in very fine detail, pieces of amber show spiders mating, killing prey, producing silk and possibly caring for their young. In a few cases, amber has preserved spiders' egg sacs and webs, occasionally with prey attached; [93] the oldest fossil web found so far is 100 million years old. [94]
The label hasn't been updated since 1988 when it was introduced. Dr. Laura Catena, a winemaker and doctor based in San Francisco, said in a written statement she welcomes any kind of alert or ...
Highly simplified and stylized diagram of the main parts of an inflated palpal bulb, based loosely on Coddington (1990); [19] hardened parts shown darker, membranous parts shown lighter Palpal bulb (also called bulbus , palpal organ , genital bulb ): The copulatory organ of the male spider, carried on the modified last segment of the pedipalp ...