Know what it is?

To speak of trilobites, we must go back to the Paleozoic era. These are arthropods that inhabited the seas specifically from the early Cambrian to the late Permian, that is, from 521 million years ago to 252 million years ago.

Its name (from the Latin 'Three lobes') is due to the 3 segments into which they were divided longitudinally: a central lobe called the Axial Lobe that was flanked on both sides by the Right Pleural Lobe and the Left Pleural Lobe, as can be seen in the following picture:


As we can see in the image, the trilobites were also divided transversely into 3 sections, called Cephalon (or head), Thorax and Pigidium.

They had legs, antennas, and other fine structures that were more difficult to fossilize and therefore are rarely preserved today. However, the appearance of the trilobites was similar to the following:

Reconstruction of Nobu Tamura

One of the highlights of trilobites is the composition of their exoskeleton, consisting of calcium phosphate and calcium carbonate in the form of calcite. This feature has allowed them to fossilize very easily, since naturally the trilobites were already formed by 'rock'. Thanks to this and that they inhabited the earth for almost 300 million years, they are currently one of the most widely known fossil organisms. Its fossil remains can be found on all continents in the petrified sediments of those oceans.

As a curiosity, to point out that the trilobites had to change their armor in order to grow, due to their great rigidity. Currently, fossilized molts are preserved, as well as trilobites that died in the molting process.

After surviving 2 extinctions that caused a drastic decline in many trilobite families, they finally disappeared in the largest extinction in Earth's history, the Permian-Triassic mass extinction, in which 90% of marine species and 70% of terrestrial. The studies explain that when the ecosystems of the seabed collapsed, the trilobites were left without food. This, added to the acidification of the ocean floor, prevented them from correctly forming their calcium exoskeletons.

We invite you to visit our Trilobite collection to learn more about these fascinating specimens. Each piece is properly documented, classified and can be shipped anywhere in the world:


Enjoy it!


Sources consulted:;


Reconstrucción de Nobu Tamura

Uno de los aspectos más destacados de los trilobites es la composición de su exoesqueleto, formado por fosfato de calcio y carbonato de calcio en forma de calcita. Esta característica ha permitido que fosilicen con mucha facilidad, puesto que de manera natural los trilobites ya estaban formados por 'roca'. Gracias a ello y a que habitaron la tierra durante prácticamente 300 millones de años, actualmente son uno de los organismos fósiles más ampliamente conocidos. Sus restos fósiles pueden encontrarse en todos los continentes en los sedimentos petrificados de aquellos océanos. 

A modo de curiosidad, señalar que los trilobites para poder crecer tenían que mudar su armadura, debido a su gran rigidez. Actualmente, se conservan mudas fosilizadas, así como trilobites que murieron en el proceso de muda. 

Tras sobrevivir a 2 extinciones que provocaron una disminución drástica de muchas familias de trilobites, finalmente desaparecieron en la mayor extinción de la historia de la Tierra, la extinción masiva del Pérmico-Triásico, en la que desaparecieron el 90 % de las especies marinas y el 70 % de las terrestres. Los estudios explican que al colapsar los ecosistemas del fondo marino, los trilobites se quedaron sin alimento. Esto, sumado a la acidificación de los fondos oceánicos impidió que pudieran formar correctamente sus exoesqueletos de calcio. 

Le invitamos a que visite nuestra colección de Trilobites para conocer más acerca de estos ejemplares fascinantes. Cada pieza está debidamente documentada, clasificada y puede enviarse a cualquier parte del mundo.



Fuentes consultadas:;


Tel/Phone: 627 64 88 98 - 680 36 96 12



Write us