{"id":9005,"date":"2025-11-23T12:58:37","date_gmt":"2025-11-23T11:58:37","guid":{"rendered":"https:\/\/clientes.munecarusa.com\/mp\/?p=9005"},"modified":"2026-02-18T11:47:59","modified_gmt":"2026-02-18T10:47:59","slug":"trilobites","status":"publish","type":"post","link":"https:\/\/clientes.munecarusa.com\/mp\/trilobites\/","title":{"rendered":"Trilobites"},"content":{"rendered":"<p>[et_pb_section fb_built=\u00bb1&#8243; custom_padding_last_edited=\u00bboff|phone\u00bb disabled_on=\u00bboff|off|off\u00bb admin_label=\u00bbFondo Men\u00fa\u00bb _builder_version=\u00bb4.27.2&#8243; background_color=\u00bb#ff6600&#8243; custom_margin=\u00bb0px||20px||false|false\u00bb custom_padding=\u00bb0px||0px||true|false\u00bb collapsed=\u00bbon\u00bb global_colors_info=\u00bb{}\u00bb][\/et_pb_section][et_pb_section fb_built=\u00bb1&#8243; custom_padding_last_edited=\u00bbon|phone\u00bb disabled_on=\u00bboff|off|off\u00bb admin_label=\u00bbIntroducci\u00f3n\u00bb _builder_version=\u00bb4.27.2&#8243; background_enable_color=\u00bboff\u00bb custom_margin_last_edited=\u00bboff|phone\u00bb custom_padding=\u00bb||0px||false|false\u00bb custom_padding_tablet=\u00bb27px||0px||false|false\u00bb custom_padding_phone=\u00bb37px||||false|false\u00bb collapsed=\u00bbon\u00bb global_colors_info=\u00bb{}\u00bb][et_pb_row make_equal=\u00bbon\u00bb custom_padding_last_edited=\u00bbon|phone\u00bb _builder_version=\u00bb4.27.2&#8243; background_size=\u00bbinitial\u00bb background_position=\u00bbtop_left\u00bb background_repeat=\u00bbrepeat\u00bb custom_margin=\u00bb||||false|false\u00bb custom_padding=\u00bb||0px||false|false\u00bb custom_padding_tablet=\u00bb||0px||false|false\u00bb custom_padding_phone=\u00bb||10px||false|false\u00bb global_colors_info=\u00bb{}\u00bb][et_pb_column type=\u00bb4_4&#8243; _builder_version=\u00bb4.16&#8243; custom_padding=\u00bb|||\u00bb global_colors_info=\u00bb{}\u00bb custom_padding__hover=\u00bb|||\u00bb][et_pb_post_title meta=\u00bboff\u00bb featured_image=\u00bboff\u00bb _builder_version=\u00bb4.27.4&#8243; _module_preset=\u00bbdefault\u00bb title_font=\u00bb|600||on|||||\u00bb title_text_align=\u00bbcenter\u00bb title_text_color=\u00bb#000000&#8243; title_font_size=\u00bb70px\u00bb title_letter_spacing=\u00bb1px\u00bb custom_margin=\u00bb||10px||false|false\u00bb animation_style=\u00bbslide\u00bb animation_direction=\u00bbbottom\u00bb title_font_size_tablet=\u00bb50px\u00bb title_font_size_phone=\u00bb20px\u00bb title_font_size_last_edited=\u00bbon|phone\u00bb title_text_shadow_style=\u00bbpreset1&#8243; global_colors_info=\u00bb{}\u00bb][\/et_pb_post_title][et_pb_text content_last_edited=\u00bboff|phone\u00bb _builder_version=\u00bb4.27.4&#8243; header_4_font=\u00bb|700||on|||||\u00bb header_4_text_align=\u00bbcenter\u00bb header_4_text_color=\u00bb#ff6600&#8243; header_4_font_size=\u00bb30px\u00bb header_4_line_height=\u00bb1.4em\u00bb background_size=\u00bbinitial\u00bb background_position=\u00bbtop_left\u00bb background_repeat=\u00bbrepeat\u00bb text_orientation=\u00bbjustified\u00bb animation_style=\u00bbzoom\u00bb text_font_size_last_edited=\u00bboff|phone\u00bb text_line_height_last_edited=\u00bboff|phone\u00bb header_4_font_size_tablet=\u00bb22px\u00bb header_4_font_size_phone=\u00bb11px\u00bb header_4_font_size_last_edited=\u00bbon|phone\u00bb header_4_text_shadow_style=\u00bbpreset1&#8243; global_colors_info=\u00bb{}\u00bb header_4_text_color__hover_enabled=\u00bboff|hover\u00bb text_text_color__hover_enabled=\u00bboff|desktop\u00bb]<\/p>\n<h4>Plot, 1698<\/h4>\n<p>[\/et_pb_text][et_pb_divider color=\u00bb#999999&#8243; admin_label=\u00bbSeparador\u00bb _builder_version=\u00bb4.27.0&#8243; _module_preset=\u00bbdefault\u00bb custom_margin=\u00bb-20px||0px||false|false\u00bb custom_padding=\u00bb||||false|false\u00bb animation_style=\u00bbslide\u00bb global_colors_info=\u00bb{}\u00bb][\/et_pb_divider][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=\u00bb4.27.2&#8243; _module_preset=\u00bbdefault\u00bb custom_margin=\u00bb||||false|false\u00bb custom_padding=\u00bb0px||10px||false|false\u00bb global_colors_info=\u00bb{}\u00bb][et_pb_column type=\u00bb4_4&#8243; _builder_version=\u00bb4.27.2&#8243; _module_preset=\u00bbdefault\u00bb animation_style=\u00bbzoom\u00bb global_colors_info=\u00bb{}\u00bb][et_pb_text content_last_edited=\u00bboff|desktop\u00bb disabled_on=\u00bboff|off|off\u00bb admin_label=\u00bbTexto\u00bb _builder_version=\u00bb4.27.5&#8243; text_text_color=\u00bb#444444&#8243; background_size=\u00bbinitial\u00bb background_position=\u00bbtop_left\u00bb background_repeat=\u00bbrepeat\u00bb text_orientation=\u00bbjustified\u00bb text_font_size_tablet=\u00bb16px\u00bb text_font_size_phone=\u00bb14px\u00bb text_font_size_last_edited=\u00bbon|phone\u00bb text_line_height_tablet=\u00bb1.7em\u00bb text_line_height_phone=\u00bb1.6em\u00bb text_line_height_last_edited=\u00bbon|phone\u00bb global_colors_info=\u00bb{}\u00bb]<\/p>\n<h2 style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-4309 alignleft\" src=\"https:\/\/clientes.munecarusa.com\/mp\/wp-content\/uploads\/2025\/01\/margen-huella.png\" alt=\"Trilobites\" width=\"30\" height=\"50\" \/><\/h2>\n<p>Los trilobites (Trilobita, del lat\u00edn tres l\u00f3bulos) constituyen una clase extinta de artr\u00f3podos pertenecientes al subfilo Trilobitomorpha. Son, sin discusi\u00f3n, los f\u00f3siles m\u00e1s representativos y emblem\u00e1ticos de toda la era Paleozoica, hasta el punto de que su presencia define numerosos estratos geol\u00f3gicos. A lo largo de d\u00e9cadas de investigaci\u00f3n se han descrito cerca de 22.000 especies, aunque se sospecha que la diversidad real pudo ser mucho mayor, ya que muchos linajes habitaron ambientes donde la fosilizaci\u00f3n era poco probable.[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=\u00bb2_3,1_3&#8243; _builder_version=\u00bb4.27.2&#8243; _module_preset=\u00bbdefault\u00bb custom_margin=\u00bb||||false|false\u00bb custom_padding=\u00bb0px||10px||false|false\u00bb global_colors_info=\u00bb{}\u00bb][et_pb_column type=\u00bb2_3&#8243; _builder_version=\u00bb4.27.2&#8243; _module_preset=\u00bbdefault\u00bb animation_style=\u00bbzoom\u00bb global_colors_info=\u00bb{}\u00bb][et_pb_image src=\u00bbhttps:\/\/clientes.munecarusa.com\/mp\/wp-content\/uploads\/2025\/11\/Trilobites.webp\u00bb alt=\u00bbTrilobites\u00bb show_in_lightbox=\u00bbon\u00bb use_overlay=\u00bbon\u00bb overlay_icon_color=\u00bb#ff6600&#8243; hover_overlay_color=\u00bbrgba(255,102,0,0.2)\u00bb align=\u00bbcenter\u00bb force_fullwidth=\u00bbon\u00bb _builder_version=\u00bb4.27.4&#8243; 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} .et_monarch .et_social_shortcode_0 .et_social_icons_container li:hover .et_social_icon, .et_monarch .et_social_shortcode_0 .et_social_networks .et_social_icons_container li:hover .et_social_network_label, .et_monarch .et_social_shortcode_0 .et_social_icons_container li:hover .et_social_networkname, .et_monarch .et_social_rounded.et_social_shortcode_0 .et_social_icons_container li:hover .et_social_count, .et_monarch .et_social_rectangle.et_social_shortcode_0 .et_social_icons_container li:hover .et_social_count { color: #ffffff !important; }<\/style>\n\t\t\t\t\t\n\t\t\t\t\t<ul class=\"et_social_icons_container\"><li class=\"et_social_like\">\n\t\t\t\t\t\t<a href=\"#\" class=\"et_social_follow\" data-social_name=\"like\" data-social_type=\"like\" data-post_id=\"0\" target=\"_blank\">\n\t\t\t\t\t\t\t<i class=\"et_social_icon et_social_icon_like\"><\/i>\n\t\t\t\t\t\t\t<div class=\"et_social_network_label\"><div class=\"et_social_networkname\">Me gusta<\/div><div class=\"et_social_count\">\n\t\t\t\t\t\t<span>0<\/span>\n\t\t\t\t\t\t<span class=\"et_social_count_label\">Likes<\/span>\n\t\t\t\t\t<\/div><\/div>\n\t\t\t\t\t\t\t<span class=\"et_social_overlay\"><\/span>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/li><\/ul>\n\t\t\t\t<\/div>[\/et_pb_code][et_pb_post_title meta=\u00bboff\u00bb featured_image=\u00bboff\u00bb _builder_version=\u00bb4.27.4&#8243; _module_preset=\u00bbdefault\u00bb title_font=\u00bb|600||on|||||\u00bb title_text_align=\u00bbcenter\u00bb title_text_color=\u00bb#000000&#8243; title_font_size=\u00bb35px\u00bb title_letter_spacing=\u00bb1px\u00bb custom_margin=\u00bb||0px||false|false\u00bb animation_direction=\u00bbbottom\u00bb title_font_size_tablet=\u00bb30px\u00bb title_font_size_phone=\u00bb20px\u00bb title_font_size_last_edited=\u00bbon|desktop\u00bb global_colors_info=\u00bb{}\u00bb][\/et_pb_post_title][et_pb_text content_last_edited=\u00bboff|phone\u00bb disabled_on=\u00bboff|off|off\u00bb admin_label=\u00bbSubt\u00edtulo\u00bb _builder_version=\u00bb4.27.4&#8243; header_2_font=\u00bb||||||||\u00bb header_3_font=\u00bb|700||on|||||\u00bb header_3_text_align=\u00bbcenter\u00bb header_3_text_color=\u00bb#444444&#8243; header_3_font_size=\u00bb30px\u00bb header_4_font=\u00bb||||||||\u00bb background_size=\u00bbinitial\u00bb background_position=\u00bbtop_left\u00bb background_repeat=\u00bbrepeat\u00bb text_font_size_last_edited=\u00bboff|phone\u00bb text_line_height_last_edited=\u00bboff|desktop\u00bb header_2_font_size_last_edited=\u00bboff|phone\u00bb header_3_font_size_tablet=\u00bb25px\u00bb header_3_font_size_phone=\u00bb15px\u00bb header_3_font_size_last_edited=\u00bbon|phone\u00bb header_4_font_size_last_edited=\u00bboff|phone\u00bb global_colors_info=\u00bb{}\u00bb header_4_text_color__hover_enabled=\u00bboff|hover\u00bb]<\/p>\n<h3>FAUNA DEL C\u00c1MBRICO<\/h3>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=\u00bb1_3&#8243; 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_module_preset=\u00bbdefault\u00bb global_colors_info=\u00bb{}\u00bb]Era: Paleozoica<br \/>\nPeriodo: C\u00e1mbrico[\/et_pb_accordion_item][et_pb_accordion_item title=\u00bbDescubridor\u00bb _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb global_colors_info=\u00bb{}\u00bb open=\u00bboff\u00bb]Plot, 1698[\/et_pb_accordion_item][et_pb_accordion_item title=\u00bbOrigen\u00bb _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb global_colors_info=\u00bb{}\u00bb open=\u00bboff\u00bb]Per\u00fa[\/et_pb_accordion_item][et_pb_accordion_item title=\u00bbGrupo\u00bb _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb global_colors_info=\u00bb{}\u00bb open=\u00bboff\u00bb]Invertebrado[\/et_pb_accordion_item][et_pb_accordion_item title=\u00bbFamilia\u00bb _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb global_colors_info=\u00bb{}\u00bb open=\u00bboff\u00bb]Phacopida[\/et_pb_accordion_item][\/et_pb_accordion][et_pb_counters bar_bg_color=\u00bb#ff6600&#8243; 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_module_preset=\u00bbdefault\u00bb custom_margin=\u00bb||||false|false\u00bb custom_padding=\u00bb30px||||false|false\u00bb animation_style=\u00bbzoom\u00bb global_colors_info=\u00bb{}\u00bb][et_pb_column type=\u00bb4_4&#8243; _builder_version=\u00bb4.27.2&#8243; _module_preset=\u00bbdefault\u00bb global_colors_info=\u00bb{}\u00bb][et_pb_text content_last_edited=\u00bboff|desktop\u00bb disabled_on=\u00bboff|off|off\u00bb admin_label=\u00bbTexto\u00bb _builder_version=\u00bb4.27.5&#8243; text_text_color=\u00bb#444444&#8243; background_size=\u00bbinitial\u00bb background_position=\u00bbtop_left\u00bb background_repeat=\u00bbrepeat\u00bb text_orientation=\u00bbjustified\u00bb text_font_size_tablet=\u00bb16px\u00bb text_font_size_phone=\u00bb14px\u00bb text_font_size_last_edited=\u00bbon|phone\u00bb text_line_height_tablet=\u00bb1.7em\u00bb text_line_height_phone=\u00bb1.6em\u00bb text_line_height_last_edited=\u00bbon|phone\u00bb global_colors_info=\u00bb{}\u00bb]Aparecieron durante el C\u00e1mbrico temprano, hace unos 540 millones de a\u00f1os, justo despu\u00e9s de la desaparici\u00f3n de la fauna ediac\u00e1rica. Desde sus primeras formas simples, los trilobites iniciaron una r\u00e1pida diversificaci\u00f3n durante el C\u00e1mbrico inferior, ocupando una enorme variedad de nichos ecol\u00f3gicos. Tras la extinci\u00f3n masiva del final del C\u00e1mbrico, \u00fanicamente sobrevivieron las especies adaptadas a ambientes pel\u00e1gicos profundos, lo que demuestra su capacidad de resistencia y adaptaci\u00f3n. Durante el Ordov\u00edcico, alcanzaron su m\u00e1ximo esplendor evolutivo: colonizaron pr\u00e1cticamente todos los ecosistemas marinos, desde plataformas someras hasta taludes profundos, y desarrollaron una variedad morfol\u00f3gica impresionante. A partir del Sil\u00farico, su evoluci\u00f3n se estabiliz\u00f3 y los cambios morfol\u00f3gicos se hicieron m\u00e1s lentos, aunque siguieron siendo un grupo abundante.<\/p>\n<p>La extinci\u00f3n masiva del Dev\u00f3nico supuso un punto de inflexi\u00f3n: todos los \u00f3rdenes desaparecieron excepto Proetida, que sobrevivi\u00f3 hasta el final del Paleozoico. Durante el Carbon\u00edfero, los trilobites se volvieron escasos y quedaron restringidos a ambientes arrecifales y zonas muy concretas. Finalmente, los \u00faltimos representantes del grupo \u2014ya muy especializados y de distribuci\u00f3n limitada\u2014 desaparecieron durante la extinci\u00f3n masiva del P\u00e9rmico\u2011Tri\u00e1sico, hace unos 250 millones de a\u00f1os, junto con euript\u00e9ridos, blastoideos, numerosos peces y otros grupos marinos. Su historia abarca casi 300 millones de a\u00f1os, lo que los convierte en uno de los linajes m\u00e1s longevos de la historia de la vida.<\/p>\n<p>En sus inicios, los trilobites fueron considerados antepasados de los crust\u00e1ceos, especialmente por su parecido superficial con las cochinillas de humedad. Tambi\u00e9n se propuso que pod\u00edan ser los ancestros de todos los artr\u00f3podos, ya que fueron los primeros en aparecer en el registro f\u00f3sil. Sin embargo, los estudios modernos han demostrado que constituyen un grupo independiente, separado tanto de los mandibulados como de los quelicerados, con caracter\u00edsticas propias que no encajan en ning\u00fan linaje actual.<\/p>\n<p>El cuerpo de los trilobites era aplanado, liso y generalmente ovalado, dividido en tres tagmas: c\u00e9falon (cabeza), t\u00f3rax y pigidio. Dos surcos longitudinales recorr\u00edan el cuerpo, dividi\u00e9ndolo en tres l\u00f3bulos: uno central (glabela en el c\u00e9falon, raquis en el tronco) y dos laterales (genas en la cabeza, pleuras en el tronco). Esta divisi\u00f3n es la que da nombre al grupo. Su tegumento dorsal era una cut\u00edcula gruesa impregnada de carbonato c\u00e1lcico, lo que favoreci\u00f3 su fosilizaci\u00f3n y explica la abundancia de restos en el registro geol\u00f3gico. El tama\u00f1o variaba enormemente: desde especies diminutas de pocos mil\u00edmetros hasta gigantes como Isotelus rex, que superaba los 60 cm.<\/p>\n<p>El c\u00e9falon era el resultado de la fusi\u00f3n de varios segmentos. Las genas se prolongaban hacia los lados y hacia atr\u00e1s formando puntas genales. Una sutura facial divid\u00eda las genas en una parte fija (fixigena) y otra m\u00f3vil (librigena). La glabela y las fixigenas formaban el cranidio. En la cara ventral se encontraba el hipostoma, una placa que proteg\u00eda la boca y que pod\u00eda estar libre o articulada, dependiendo de la especie.<\/p>\n<p>Sobre las genas se situaban los ojos compuestos, sorprendentemente avanzados para su antig\u00fcedad. Algunos trilobites ten\u00edan ojos sobre ped\u00fanculos, similares a los de ciertos crust\u00e1ceos modernos. Fueron los primeros animales en desarrollar ojos complejos, con lentes de calcita perfectamente orientadas, lo que probablemente contribuy\u00f3 a su \u00e9xito evolutivo. En la parte ventral del c\u00e9falon se insertaban antenas unirr\u00e1meas largas y articuladas, equivalentes a las de insectos y miri\u00e1podos.<\/p>\n<p>El t\u00f3rax estaba formado por entre 2 y 40 segmentos articulados, lo que permit\u00eda al animal enrollarse en forma de bola como mecanismo defensivo, igual que hacen hoy las cochinillas. Cada segmento llevaba un par de patas similares a las del c\u00e9falon.<\/p>\n<p>El pigidio, parte final del cuerpo, estaba formado por met\u00e1meros fusionados. En algunos casos presentaba cercos apicales multiarticulados.<\/p>\n<p>Las patas de los trilobites eran birr\u00e1meas, con un exopodio foli\u00e1ceo probablemente branquial y nadador, y un endopodio de seis artejos con una u\u00f1a terminal. Este tipo de ap\u00e9ndice no es hom\u00f3logo al de otros artr\u00f3podos modernos, lo que subraya la singularidad del grupo.<\/p>\n<p>En 2003, gracias a la abundancia de f\u00f3siles en los yacimientos c\u00e1mbricos de Murero, se identific\u00f3 por primera vez dimorfismo sexual en trilobites, el caso m\u00e1s antiguo conocido en el reino animal. Se estudiaron cuatro especies del g\u00e9nero Paradoxides y se observaron dos morfotipos persistentes a lo largo del tiempo. Las diferencias inclu\u00edan la longitud del pigidio y variaciones en segmentos tor\u00e1cicos, probablemente relacionadas con la posici\u00f3n del poro genital.<\/p>\n<p>El desarrollo de los trilobites inclu\u00eda varios estadios larvarios. El primero, protaspis, consist\u00eda en un c\u00e9falon y un protopigidio. Le segu\u00eda el estadio meraspis, donde aparec\u00edan los primeros segmentos tor\u00e1cicos. Finalmente, el estadio holaspis correspond\u00eda a larvas con metamerizaci\u00f3n completa, que alcanzaban el tama\u00f1o adulto tras varias mudas.<\/p>\n<p>Eran animales exclusivamente marinos. Su forma aplanada, ojos dorsales y cut\u00edcula dura sugieren que la mayor\u00eda eran bent\u00f3nicos, aliment\u00e1ndose de part\u00edculas del sedimento. Carec\u00edan de ap\u00e9ndices excavadores o piezas bucales trituradoras, por lo que probablemente eran micr\u00f3fagos. Algunas especies se volvieron pel\u00e1gicas y desarrollaron espinas para mejorar la flotabilidad. Las larvas protaspis, con espinas prominentes, eran formas pel\u00e1gicas con gran capacidad colonizadora.<\/p>\n<p>La reducci\u00f3n o p\u00e9rdida de ojos en algunas especies indica adaptaci\u00f3n a aguas profundas y zonas af\u00f3ticas.<\/p>\n<p>Las mudas eran frecuentes, por lo que los f\u00f3siles suelen consistir en exuvias desarticuladas: cranidios, mejillas libr\u00edgenas y pigidios.<\/p>\n<p>Los trilobites son responsables de varios icnof\u00f3siles caracter\u00edsticos:<\/p>\n<ul>\n<li>Cruziana: pistas de locomoci\u00f3n y alimentaci\u00f3n, con surcos paralelos y estriaciones en \u201cV\u201d.<\/li>\n<li>Diplichnites: huellas de desplazamiento r\u00e1pido, formadas por peque\u00f1as marcas paralelas.<\/li>\n<li>Rusophycus: huellas de reposo o acecho, m\u00e1s profundas y aisladas.<\/li>\n<\/ul>\n<p>Los trilobites m\u00e1s antiguos pertenecen a los falotaspidoideos y redlichioideos (orden Redlichiida), datados entre 540 y 520 millones de a\u00f1os. Entre los primeros se encuentran Profallotaspis jakutensis (Siberia), Fritzaspis (EE. UU.), Hupetina antiqua (Marruecos) y Serrania gordaensis (Espa\u00f1a). Se cree que el grupo se origin\u00f3 en la regi\u00f3n que hoy es Siberia, desde donde se expandi\u00f3 globalmente.<\/p>\n<p>Los trilobites, con su extraordinaria diversidad, su compleja anatom\u00eda y su larga historia evolutiva, son uno de los grupos f\u00f3siles m\u00e1s estudiados y admirados. 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