''Kleptothule rasmusseni'' is a small, elongated

trilobite Trilobites (; meaning "three-lobed entities") are extinction, extinct marine arthropods that form the class (biology), class Trilobita. One of the earliest groups of arthropods to appear in the fossil record, trilobites were among the most succ ...

, about 3 cm in length, and about 5 to 6 mm in width, from the

Sirius Passet Sirius Passet is a Cambrian Lagerstätte in Peary Land, Greenland. The Sirius Passet Lagerstätte was named after the Slædepatruljen Sirius, Sirius sledge patrol that operates in North Greenland. It comprises six places in Nansen Land, on the eas ...

Lagerstätte A Fossil-Lagerstätte (, from ''Lager'' 'storage, lair' '' Stätte'' 'place'; plural ''Lagerstätten'') is a sedimentary deposit that preserves an exceptionally high amount of palaeontological information. ''Konzentrat-Lagerstätten'' preserv ...

. It is currently placed in the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Nevadiidae, though this may change with further study. Its

cephalon Cephalon, Inc. was an American biopharmaceutical company co-founded in 1987 by pharmacologist Frank Baldino Jr., Frank Baldino, Jr., neuroscientist Michael Lewis, and organic chemist James C. Kauer—all three former scientists with the DuPont ...

is composed of at least five segments, and its elongated

thorax The thorax (: thoraces or thoraxes) or chest is a part of the anatomy of mammals and other tetrapod animals located between the neck and the abdomen. In insects, crustaceans, and the extinct trilobites, the thorax is one of the three main di ...

is composed of 27+ segments. The 20 or so segments of the

pygidium The pygidium (: pygidia) is the posterior body part or shield of crustaceans and some other arthropods, such as insects and the extinct trilobites. In groups other than insects, it contains the anus and, in females, the ovipositor. It is compos ...

are poorly defined, as they are fused together.

References

External links

* * Peripatus Homepage "Trilobite Origins

*https://web.archive.org/web/20070831114814/http://www.palaeos.com/Paleozoic/Cambrian/Sirius_Passet.html Redlichiida Cambrian trilobites Cambrian animals of Europe Cambrian arthropods of North America Cambrian Greenland Fossils of Greenland Sirius Passet fossils Buen Formation Fossil taxa described in 1995 {{redlichiida-stub Cambrian genus extinctions