Fossil of Protozoea hilgendorfi in the Museo di Storia Naturale, Milano, photographed by Ghedoghedo.

Belongs within: Eumalacostraca.

The Thylacocephala are a group of crustaceans of uncertain affinities known from the Silurian to the Cretaceous (Lange & Schram 2002).

Characters (from Lange & Schram 2002): Entire body typically covered by large carapace. obscuring body segmentation. Antennae and antennules present. Pair of large compound eyes often bulging out from anterior margin of carapace. Three pairs of sub-chelate raptorial limbs present, followed by eight or more small swimming limbs; row of feather-like gills typically present near middle region of body.

    |--Thylacocephalus cymolopos Lange et al. 2001 LS02
    |--Pseuderichthus cretaceus Dames 1886 LS02
    |--Dollocaris ingens van Straelen 1923 LS02
    |--Austriocaris Glaessner 1931 FGS04
    |--Concavicaris Rolfe 1961 [Concavicarida] FGS04
    |--Ostenocaris Arduini et al. 1982 LS02
    |    `--O. cypriformis (Arduini et al. 1980) LS02
    `--Protozoea LS02
         |--P. damesi Roger 1946 LS02
         `--P. hilgendorfi Dames 1886 LS02

*Type species of generic name indicated


[FGS04] Feldmann, R. M., A. A. Garassino & C. E. Schweitzer. 2004. The presumed decapod, Palaeopemphix Gemmellaro, 1890, is a unique member of the Phyllocarida (Palaeopemphicida: Palaeopemphidae). Journal of Palaeontology 78: 340-348.

[LS02] Lange, S., & F. R. Schram. 2002. Possible lattice organs in Cretaceous Thylacocephala. Contributions to Zoology 71 (4): 159-169.

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