Mygalomorph Trapdoor Spider, Kempner, TX 111208, pg 2

This photo, and those that follow, were taken of the first spider Marvin's wife found on their patio. It shows the spider's head and thorax (the cephalothorax, or dorsal prosoma, covered by a sclerotized plate, the carapace) , part of the abdomen, and the proximal three segments of the legs and pedipalps. Notice the robust jaws (chelicerae) that project outward as a forward extension of the face. This structure typifies spiders in the infraorder Mygalomorphae. As noted in Ubick et al. (2005), pg. 25, such spiders also have two pairs of book lungs and eight eyes, are without the anterior median spinnerets (AMS) found in many araneomorphs, and have stout legs. The cephalothorax is smooth and glabrous. Notice the deep, procurved thoracic furrow (an important, though not definitive, anatomical marker for the Ctenizidae) that separates the slightly bulging head (pars cephalica) from the thoracic region (pars thoracica) posterior to it. The musculature for the spider's sucking stomach attaches at the thoracic furrow, to the underside of the carapace. A portion of the lateral anterior abdomen is a lighter color, due in part to a paucity of hairs over the spider's anterior book lungs. The abdomen has no dorsal tergites, which rules out the Antrodiaetidae, Atypidae, and Mecicobothriidae. A more complete view of the coverings over this spider's book lungs is shown on the NEXT PAGE ----  PAGE MENU:  1 * 2 * 3 * 4 * 5 * 6 * 7 * 8 *

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