![\"\"](\"http:\/\/upload.wikimedia.org\/wikipedia\/commons\/3\/3c\/NIEdot298A.jpg\")
<\/p>\n<\/p>\n
204.<\/em><\/p>\n \u00a0<\/em><\/p>\n \u00a0Kirby has remarked (and I have observed the same fact) that the anterior tarsi, or feet, of many male dung-feeding beetles are often broken off; he examined seventeen specimens in his own collection, and not one had even a relic left. In the Onites apelles<\/span> the tarsi are so habitually lost that the insect has been described as not having them. In some other genera they are present, but in a rudimentary condition. In the Ateuchus or sacred beetle of the Egyptians, they are totally deficient. The evidence that accidental mutilations can be inherited is at present not decisive; but the remarkable cases observed by Brown-Sequard in guinea-pigs, of the inherited effects of operations, should make us cautious in denying this tendency. Hence, it will perhaps be safest to look at the entire absence of the anterior tarsi in Ateuchus, and their rudimentary condition in some other genera, not as cases of inherited mutilations, but as due to the effects of long-continued disuse; for as many dung-feeding beetles are generally found with their tarsi lost, this must happen early in life; therefore the tarsi cannot be of much importance or be much used by these insects.<\/em><\/p>\n \u00a0<\/em><\/p>\n Kirby ha se\u00f1alado -y yo he observado el mismo hecho- que los tarsos o pies anteriores de cole\u00f3pteros copr\u00f3fagos machos est\u00e1n frecuentemente rotos: examin\u00f3 diez y siete ejemplares de su propia colecci\u00f3n, y en ninguno quedaba ni siquiera un resto de tarso. En el Onites apelles<\/span> es tan habitual que los tarsos est\u00e9n perdidos, que el insecto ha sido descrito como no teni\u00e9ndolos. En algunos otros g\u00e9neros, los tarsos se presentan, pero en estado rudimentario. En el Ateuchus, o escarabajo sagrado de los egipcios, faltan por completo. La prueba de que las mutilaciones accidentales pueden ser heredadas actualmente no es decisiva; pero, los notables casos de efectos hereditarios de operaciones observados por Brown-S\u00e9quard en los conejillos de Indias nos obligan a ser prudentes en negar esta tendencia. Por consiguiente, quiz\u00e1 sea lo m\u00e1s seguro considerar la completa ausencia de tarsos anteriores en el Ateuchus y su condici\u00f3n rudimentaria en algunos otros g\u00e9neros, no como casos de mutilaciones heredadas, sino como debidos a los efectos del prolongado desuso, pues, como muchos cole\u00f3pteros copr\u00f3fagos se encuentran generalmente con sus tarsos perdidos, esto tuvo que haber ocurrido al principio de su vida, por lo cual los tarsos no pueden ser de mucha importancia ni muy usados en estos insectos.<\/em><\/p>\n **********************************************************************************************<\/p>\n El autor sigue dando ejemplos del efecto de las condiciones sobre los organismos.<\/p>\n Varios autores han observado con frecuencia la mutilaci\u00f3n en los tarsos de escarabajos. La prueba de que las mutilaciones accidentales pueden ser heredadas actualmente no es decisiva, informa el autor.<\/p>\n Menciona asimismo los trabajos de Brown-Sequard. Publicados en The Lancet y severamente criticados por Weissman conten\u00edan los experimentos principales a favor de la herencia de caracteres adquiridos:<\/p>\n <\/p>\n C. E. Brown<\/em>-S\u00e9quard, \u00abOn the Hereditary Transmission of Effects of Certain Injuries to the Nervous System<\/em>,\u00bb The Lancet (January 2, 1875): 7-8.<\/p>\n <\/p>\n Habr\u00e1 que volver pronto sobre estos trabajos, \u2026\u2026\u2026.Tal vez contengan resultados importantes ocultos bajo la influencia de las concepciones dogm\u00e1ticas de Weissman\u2026\u2026<\/p>\n","protected":false},"excerpt":{"rendered":" 204. \u00a0 \u00a0Kirby has remarked (and I have observed the same fact) that the anterior tarsi, or feet, of many male dung-feeding beetles are often broken off; he examined seventeen specimens in his own collection, and not one had even a relic left. In the Onites apelles the tarsi are so habitually lost that the insect has been described as not having them. In some other genera they are present, but in a rudimentary condition. In the Ateuchus or sacred beetle of the Egyptians, they are totally deficient. The evidence that accidental mutilations can be inherited is at present not\u2026<\/p>\n","protected":false},"author":86,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0},"categories":[467,468,14322,14331],"tags":[22775],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":4}},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/posts\/135777"}],"collection":[{"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/users\/86"}],"replies":[{"embeddable":true,"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/comments?post=135777"}],"version-history":[{"count":6,"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/posts\/135777\/revisions"}],"predecessor-version":[{"id":136689,"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/posts\/135777\/revisions\/136689"}],"wp:attachment":[{"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/media?parent=135777"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/categories?post=135777"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/tags?post=135777"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}