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Spider Palpus - DIY Wiring Diagram

Spider Palpus

Posted by Cassandra W. Thomas in Spider
Spider Palpus -
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Spider Palpus

Spider Palpus-
Spider Palpus,
PLATE V. Xysticus lam'o, C. L. Koch—Enlarged; (1, eyes from behind ; 6,0, palpus in two positions; d, natural length of spider. Philodromus margaritatus, Clerck.—Var., jqjunus, Panz.; a, profile outline, without legs or palpi; b, palpus ; natural length of spider, indicated by line, unlettered. Philodromus, sp. ?—Eyes from in front. Lycosa herbiqmda, Black—Enlarged; a, profile outline, without legs or palpi; 6, eyes from in front; 0, palpus ; natural length of spider, shown by line unlettered.The genital appendage of the palpus of the male is exceedingly complicated in structure in the more specialized spiders, as in the Argiopida?; but it is comparatively simple in some of the more generalized families. A few illustrations of

the.simpler forms will be given here. The Filistata Type of Palpus. — In Filistata bibernalis, which is a very common house spider in the South, is found the most simple type of male palpus that I have seen among spiders. In the males of this species, the i9o9] Evolution in Palpus of Spiders 6i primitive type, and moreover it generally coincides with the long axis of the bulb, whenever this is in evidence. This line or axis is a valuable basis for orientation in the manifold changes in form undergone by the bulb in the higher families, and I will, for convenience, term it the principal axis of the bulb. This axis, as the figure shows, generally forms an angle of from 50 to 90 degrees with the long axis of the tarsal joint. Four

characters.are to be 269. a, i, palpus in two positions ; c, eyes and falces ; d, natural length of Spider, and profile without legs; /, extremity of tarsus, showing terminal claws. 7. (Ecobius trimaculatus 3 , p. 219. a, b, palpus of male in two positions ; c, natural length of female ; d, cephalothorax and eyes of male ; e, natural length of male ; f, female without legs. 8. (Ecobius teliger 3 , p. 221 . a, palpus ; b, oephalothorax and eyes ; e, natural length of Spider. 10. Argyrodts syriaca £ , p. 279. a, female without legs; Plate XXXIII. No. 1. Heca'erge nemoralis, Bl., 3 . a, natural size of spider ; b, c, palpus, in two positions; d, tarsus and metatarsus of fore leg. No. 2. Thomisus simplex, Cambr., 3 . a, natural

size.of spider; b, palpus. No. 3. Drassus subniger, Cambr., <J . a, natural size of spider ; b, c, palpus, in two positions; d, profile of ce phalothorax without legs; e, eyes and falces, from the front ; /, maxillae and labium. No. 4. Liocranum pralongipes, Cambr., <j & $ . a, natural size of spider ; b, c, palpus, It is by means of these organs that spiders kill their prey. The palpi are leglike in form, but differ greatly according to sex. In the female the last segment of the palpus resembles a foot of the spider, and is usually armed with a welldeveloped curved claw. But in the male the corresponding segment is more or less enlarged, and very complicated in structure (Fig. 16). The greater number of spiders have four

pairs.of eyes (Fig. 17), but there may be only one, two, or three pairs ; and certain Possibly the extrusion of the sperma by the male upon the little silken receptacle from which it is absorbed into the palps takes place very rapidly; or it may be done long before the act of fertilization ; perhaps, as Thorell suggests, immediately after the last change of the skin. The Cymbium is that part of the modified digital joint of the male spider's palpus upon which is placed the copulatory apparatus which it sustains. In many species of Orbweavers it covers one side of bium. the diSital, Levi, H. W. 1961. Evolutionary trends in the development of the palpal sclerites in the spider family Theridiidae. Journal of Morphology 108,

1–9..Levi, H. W. 1965. Techniques for the study of spider genitalia. Psyche 72, 152–158. Levi, H. W. 1968. The spider genera Gea and Argiope in America (Araneae: Araneidae). Bulletin of the Museum of Comparative Zoology 136, 319–352. Levi, H. W. 1970. Problems in the reproductive physiology of the spider palpus. Bulletin du Musée national Despite the spiders being large and conspicuous, and subject to recent descriptive and revisionary work (AlayonGarcia 1992, 2001, 2003, 2005; Corronca 1996, 1998; ValdezMondragon 2007, 2010), several previously undescribed species have been found. There is no doubt that there are still more If only a right palpus was available, it was photographed and the photo was inverted horizontally for

consistency.using Adobe Photoshop. In most descriptive work and revisionary