{"id":26593,"date":"2024-09-15T06:57:34","date_gmt":"2024-09-15T01:27:34","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=26593"},"modified":"2025-04-08T03:18:04","modified_gmt":"2025-04-07T21:48:04","slug":"trilobites","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/trilobites\/","title":{"rendered":"What are Trilobites?"},"content":{"rendered":"<h2><strong>About Trilobites:<\/strong><\/h2>\n<ul>\n<li>They are a group of <strong>extinct marine arthropods.<\/strong><\/li>\n<li>Tri-lob-ite means <strong>three-part-body<\/strong> in Latin.<\/li>\n<li>They <strong>first appeared<\/strong> around <strong>521 million years ago<\/strong>, shortly after the beginning of the <strong>Cambrian period<\/strong>, living through the majority of the Palaeozoic Era for nearly 300 million years.<\/li>\n<li>They <strong>died out at<\/strong> the <strong>end of the Permian<\/strong>, 251 million years ago, killed <strong>by the end Permian mass extinction event<\/strong> that removed over 90% of all species on Earth.\u00a0<\/li>\n<li>Features:\n<ul>\n<li>They are recognized by their <strong>distinctive three-lobed, three-segmented form.<\/strong><\/li>\n<li>Trilobites, like other arthropods, had an <strong>external skeleton<\/strong>, called exoskeleton, composed of chitinous material.<\/li>\n<li>Trilobites periodically <strong>shed their exoskeleton to accommodate growth<\/strong>. This process is <strong>called molting<\/strong>. Most fossil trilobites are actually fossil trilobite molts.<\/li>\n<li>Trilobites were the <strong>first group of animals<\/strong> in the animal kingdom <strong>to develop complex eyes.<\/strong><\/li>\n<li>They were also one of the <strong>first organisms to develop multiple appendages for moving around.<\/strong><\/li>\n<li>Some trilobites could swim, others burrowed or crawled around on muddy sea floors.<\/li>\n<li>The smallest trilobite fossils are a centimeter or less in size. The largest trilobites were more than 70 cm long.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><strong>What are Arthropods?<\/strong><\/h2>\n<ul>\n<li>Arthropods are <strong>invertebrates with<\/strong> a hard <strong>exoskeleton, a segmented body, and jointed appendages.<\/strong><\/li>\n<li>They make up about <strong>75% of all animals on Earth<\/strong>.<\/li>\n<li>Arthropods are <strong>represented in every habitat<\/strong> on Earth and show a great variety of adaptations.<\/li>\n<li>Arthropods are divided into <strong>four major groups:<\/strong>\n<ul>\n<li><strong>insects;<\/strong><\/li>\n<li><strong>myriapods<\/strong> (including centipedes and millipedes);<\/li>\n<li><strong>arachnids<\/strong> (including spiders, mites, and scorpions);<\/li>\n<li><strong>crustaceans<\/strong> (including slaters, prawn, and crabs).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h3><strong>Q1<\/strong>: What are invertebrates?<\/h3>\n<p>Invertebrates are animals without a backbone or bony skeleton. They range in size from microscopic mites and almost invisible flies to giant squid with soccer-ball-size eyes. This is by far the largest group in the animal kingdom: 97 percent of all animals are invertebrates.<\/p>\n<p><strong>Source: <\/strong><a href=\"https:\/\/www.thehindu.com\/sci-tech\/trilobite-fossils-from-upstate-new-york-reveal-extra-set-of-legs\/article68638836.ece\" target=\"_blank\" rel=\"nofollow noopener\"><u>Trilobite fossils from upstate New York reveal extra set of legs<\/u><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Trilobites are a group of extinct marine arthropods.<\/p>\n","protected":false},"author":5,"featured_media":26594,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-26593","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-upsc-prelims-current-affairs","8":"no-featured-image-padding"},"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/26593","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=26593"}],"version-history":[{"count":0,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/26593\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/26594"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=26593"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=26593"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=26593"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}