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Rugathodes sexpunctatus
''Rugathodes sexpunctatus'' is a minute species of spider in the family Theridiidae, the cobweb or tangle-web spiders. This family includes the medically important Latrodectus genus—the widow spiders. The species in the ''Rugathodes'' genus are too small to be dangerous to humans. There is very little known about most species in this genus.
==Description==
Total length (of body, excluding legs) is 1.5-2.5 mm.〔〔 Typically, the cephalothorax is pale yellow-brown with a dark/blackish median band, usually extending the full length of the carapace, widest at the posterior eye row, surrounding the eyes. The cephalothorax margins are dusky. The abdomen is pale yellow-brown with a variable pattern of three pairs of black and white spots, giving the species its name (from the Latin sex meaning "six" and punctum meaning "spot"). There is often a broken white band bordering the rows of spots. The sides of the abdomen are dusky and the ventral surface is pale. There is considerable variation within the species, with east coast specimens tending to have distinct spots, while west coast specimens can have a totally black abdominal dorsum. Alaska specimens tend to be intermediate in coloration,〔 but are variable, with overall coloration from the typical pale yellow-brown to dark brown or greenish-gray, and occasionally pinkish areas on the dorsum between the spots. Darker individuals can be very difficult to differentiate from the closely related ''Rugathodes aurantius''.
Female distinguishing characteristics: The paired openings of the epigynum (epigyne) are nearly merged into a single oval opening, with a variable median divider extending in from the anterior side, giving the impression of a rounded ‘B’ lying on its back.
Male distinguishing characteristics: The chelicerae (fangs) are enlarged with a very distinctive shape, as shown in the photograph.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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