Areia fritschi, from here.

Belongs within: Phacopida.
Contains: Parapilekia, Cyrtometopinae.

The Pilekiinae as recognised by Přibyl et al. (1985) is known from the Upper Cambrian and Lower Ordovician, though it is largely defined by plesiomorphies and probably paraphyletic to other subfamilies of the Cheiruridae. Members of the Pilekiinae generally have a pygidium consisting of 3‒5(+1) axial rings and three or four pairs of pleurae bearing longitudinal furrows and elongated into spines (Přibyl et al. 1985). Derivatives of the Pilekiinae include the Areiinae, a group of burrowing trilobites known from the Lower to Upper Ordovician (Přibyl et al. 1985).

    |  i. s.: Metapilekia Harrington 1938PVP85
    |           |--*M. bilirata Harrington 1938PVP85
    |           `--M. martelli (Kobayashi 1934)PVP85
    |         Seisonia Kobayashi 1934PVP85
    |           `--*S. sphericauda Kobayashi 1934PVP85
    |--Metapliomerops Kobayashi 1934PVP85
    |    |--*M. extenuatus (Raymond 1924)PVP85
    |    `--M. latidorsatus Raymond 1937PVP85
    |--Pilekia Barton 1916PVP85
    |    |--*P. apollo (Billings 1860)PVP85
    |    |--P. eryx (Billings 1860)PVP85
    |    |--P. transversalis (Zhou 1984)PVP85
    |    `--P. trio Hintze 1953PVP85
    `--+--Eocheirurus Rosova 1960PVP85
       |    |--*E. salairicus (Rosova 1960)PVP85
       |    |--E. probus Rosova 1960PVP85
       |    `--E. subtilis Rosova 1960PVP85
          |--Demeterops Přibyl & Vaněk in Přibyl, Vaněk & Pek 1985PVP85
          |    `--*D. loella (Demeter 1973) [=Pilekia loella]PVP85
          |--Macrogrammus Whittard 1966PVP85
          |    `--*M. scylfense Whittard 1966PVP85
          |--Koraipsis Kobayashi 1934PVP85
          |    |--*K. spina Kobayashi 1934PVP85
          |    |--K. punctata (Kobayashi 1934)PVP85
          |    `--K. shansiensis Chang 1966PVP85
          |--Anacheirurus Reed 1896PVP85
          |    |--*A. frederici (Salter 1864)PVP85
          |    |--A. atecae (Hammann 1971)PVP85
          |    |--A. discretus (Barrande 1868)PVP85
          |    |--A. plutonis Rushton 1973PVP85
          |    `--A. sougyi (Destombes 1969)PVP85
          `--+--Ibexaspis Přibyl & Vaněk in Přibyl, Vaněk & Pek 1985PVP85
             |    |--*I. brevis (Young 1973) [=Protopliomerops quattuor brevis]PVP85
             |    `--I. quattuor (Hintze 1953)PVP85
                     |--Areiaspis Přibyl & Vaněk 1964PVP85
                     |    `--*A. barrandei (Perner 1918)PVP85
                     `--Areia Barrande 1872PVP85
                          |--A. (Areia)PVP85
                          |    |--*A. (A.) bohemica Barrande 1872PVP85
                          |    `--A. (A.) suecica Olin 1906PVP85
                          `--A. (Turantyx Přibyl & Vaněk in Přibyl, Vaněk & Pek 1985)PVP85
                               `--A. (*T.) fritschi Barrande 1872PVP85
Nomen nudum: Areia bussacensis Delgado in Thadeau 1947PVP85

*Type species of generic name indicated


[PVP85] Přibyl, A., J. Vaněk & I. Pek. 1985. Phylogeny and taxonomy of family Cheiruridae (Trilobita). Acta Universitatis Palackianae Olomucensis Facultas Rerum Naturalium Geographica-Geologica XXIV 83: 107–193.

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