''Lepidocoleus'' is a genus of extinct armored

annelid The annelids (Annelida , from Latin ', "little ring"), also known as the segmented worms, are a large phylum, with over 22,000 extant species including ragworms, earthworms, and leeches. The species exist in and have adapted to various ecol ...

worm Worms are many different distantly related bilateral animals that typically have a long cylindrical tube-like body, no limbs, and no eyes (though not always). Worms vary in size from microscopic to over in length for marine polychaete wor ...

in the class Machaeridia. Two notable species are ''L. caliburnus'' or the "

Excalibur Excalibur () is the legendary sword of King Arthur, sometimes also attributed with magical powers or associated with the rightful sovereignty of Britain. It was associated with the Arthurian legend very early on. Excalibur and the Sword in th ...

worm", and ''L. shurikenus'', or the "

shuriken A ''shuriken'' ( ja, 手裏剣; literally: "hidden hand blade") is a Japanese concealed weapon that was used as a hidden dagger or metsubushi to distract or misdirect. They are also known as throwing stars, or ninja stars, although they were ...

worm". The creature had a "suit" of armor running down its body in the form of overlapping calcite crystals. This worm probably lived in shallow water reefs feeding on organic waste. It lived from the

Hirnantian The Hirnantian is the final internationally recognized stage of the Ordovician Period of the Paleozoic Era. It was of short duration, lasting about 1.4 million years, from to Ma (million years ago). The early part of the Hirnantian was charact ...

of the upper

Ordovician The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start ...

to the

Famennian The Famennian is the latter of two faunal stages in the Late Devonian Epoch. The most recent estimate for its duration estimates that it lasted from around 371.1 million years ago to 359.3 million years ago. An earlier 2012 estimate, still used b ...

of the

Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, whe ...

Description

The worm is tiny, only about a fraction of an inch long. The creatures had two pairs of armor plates on their body, one running the length of the skeleton, and the other on the sides of the body. Because of this, the worm probably could have

rolled Rolling is a Motion (physics)#Types of motion, type of motion that combines rotation (commonly, of an Axial symmetry, axially symmetric object) and Translation (geometry), translation of that object with respect to a surface (either one or the ot ...

into a ball like a

Trilobite Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the At ...

References

{{Taxonbar, from=Q110251947 Prehistoric annelid genera