Tamisiocaris

Tamisiocaris (from Latin tamisium, sieve, and Greek karis, crab, shrimp) is a radiodont genus from the Cambrian period. The taxon was initially described in 2010 based on frontal appendages discovered from the Sirius Passet lagerstatte in northern Greenland^[1] and is also known from the Kinzers Formation in Pennsylvania.^[2] A subsequent study by Vinther and colleagues in 2014 revealed that the frontal appendages were segmented and bore densely packed auxiliary spines, which were adapted to suspension feeding in a manner analogous to modern baleen whales.^[1] It is assigned to the family Tamisiocarididae, and is measured about 22.8–33.6 cm (0.75–1.10 ft) long.^[3]

Life reconstruction of Tamisiocaris borealis alongside other organisms from the Sirius Passet.

Size diagram

Tamisiocaris Temporal range: Cambrian Stage 3 PreꞒ Ꞓ O S D C P T J K Pg N
Movement of a frontal appendage
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	†Dinocaridida
Order:	†Radiodonta
Family:	†Tamisiocarididae
Genus:	†Tamisiocaris Daley & Peel, 2010
Species:	†T. borealis
Binomial name
†Tamisiocaris borealis Daley & Peel, 2010

Phylogeny

Tamisiocaris in cladogram after Vinther et al., 2014.^[1]

Radiodonta	Caryosyntrips Anomalocarida Anomalocarididae Amplectobeluidae Tamisiocarididae Echidnacaris briggsi Tamisiocaris borealis Hurdiidae