Oelandocaris

Oelandocaris
Temporal range: Upper Cambrian
Holotype specimen
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Family: †Oelandocarididae
Genus: †Oelandocaris
Müller, 1983
Species:
†O. oelandica
Binomial name
†Oelandocaris oelandica
Müller, 1983

Oelandocaris is an extinct genus of stem-mandibulate,[1] or possibly a megacheiran,[2] within the family Oelandocarididae.

Description

Reconstruction of Oelandocaris

Oelandocaris has a large head segment with a possible median eye, similar to peytoiids, making up roughly one half of its body.[3] It has five tergites, each with a biramous limb pair and a spike on their ends, and a cylindrical tail segment. In addition, the head has two biramous limb pairs, antennae and antennules, the posterior similar in structure to the bodily limbs, the anterior including the possible mandibles. It also has a pair of possible great appendages. The whole animal only measures about a millimetre long, similar in size to other Orsten fauna.

Ecology

As the exopods of Oelandocaris's limbs are large and flattened, it is very likely that it was a swimming animal, and presumably planktonic, based on its size.

Etymology

Oelandocaris derives from the island of Öland in Sweden, a primary location for Orsten fossils, and the Greek word καρίς, meaning "shrimp" or "crab".[3]

Distribution

Oelandocaris is known from six specimens, all from the Orsten lägerstatten. The original specimen only preserved the body, however more complete specimens including limbs have been found.

References

  1. ^ Stein, Martin; Waloszek, Dieter; Maas, Andreas (27 April 2005). "Oelandocaris oelandica and the stem lineage of Crustacea". Crustacea and Arthropod Relationships. 16: 57–71. doi:10.1201/9781420037548.ch3 (inactive 2024-11-12).{{cite journal}}: CS1 maint: DOI inactive as of November 2024 (link)
  2. ^ Aria, Cédric; Caron, Jean-Bernard (2017). "Burgess Shale fossils illustrate the origin of the mandibulate body plan". Nature. 545 (7652): 89–92. Bibcode:2017Natur.545...89A. doi:10.1038/nature22080. PMID 28445464. S2CID 4454526.
  3. ^ a b Müller, Klaus J. (1983). "Crustacea with preserved soft parts from the Upper Cambrian of Sweden". Lethaia. 16 (2): 93–109. doi:10.1111/j.1502-3931.1983.tb01704.x.