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<i>Latrodectus mactans</i>. Spiders are "dimerosomatous - that is, have the body divided into two principal regions, the cephalothorax, or head and chest together, and the abdomen, which is generally tumid or globose...In those species which are poisonous the falces are traversed by the duct of a venom-gland." &mdash;Whitney, 1889

Female Black Widow Spider with a View of the Under Side of the Abdomen

Latrodectus mactans. Spiders are "dimerosomatous - that is, have the body divided into two principal…