Studeria elegans, from the Natural History Museum.

Belongs within: Cassiduloida.

The Pliolampadidae are a heterogenous group of irregular echinoids known from the Upper Cretaceous to the present (Kier 1966).

Characters (from Kier 1966): Medium-sized to large, apical system monobasal, three or four genital pores; petaloid pores strongly conjugate, single pore in all ambulacral plates beyond petals; periproct marginal, inframarginal or supramarginal, usually longitudinal; bourrelets usually well developed; buccal pores present; usually no naked zone in interambulacrum 5 adorally.

    |--+--Santeelampas Cooke 1959K66
    |  |    `--*S. oviformis (Conrad 1850) [=Catopygus oviformis]K66
    |  |--Gitolampas Gauthier 1889 (see below for synonymy)K66
    |  |    |--*G. tunetana (Gauthier 1889) [=Pliolampas tunetana, *Bothriolampas tunetana]K66
    |  |    |--‘Echinanthus’ georgiensis Twitchell 1915 [=*Echanthus georgiensis]K66
    |  |    |--G. lamberti Checchia-Rispoli 1921 [=*Gitolampopsis lamberti]K66
    |  |    `--G. zuffardii Checchia-Rispoli 1921SG93
    |  `--+--Neocatopygus Duncan & Sladen 1882K66
    |     |    `--*N. rotundus Duncan & Sladen 1882K66
    |     |--Ilarionia Dames 1878K66
    |     |    `--*I. beggiatoi (Laube 1868) [=Echinanthus beggiatoi]K66
    |     |--Kephrenia Fourtau 1909K66
    |     |    `--*K. lorioli Fourtau 1909K66
    |     `--Daradaster Tessier 1952K66
    |          `--*D. peroni Tessier 1952K66
    `--+--Zuffardia Checchia-Rispoli 1931K66
       |    `--*Z. sanfilippoi (Checchia-Rispoli 1914) [=Pseudocatopygus sanfilippoi]K66
       `--+--Termieria Lambert 1931K66
          |    `--*T. henrici Lambert 1931K66
          |--Pseudopygaulus Coquand 1862 (see below for synonymy)K66
          |    |--*P. trigeri (Coquand 1862) [=Catopygus trigeri]K66
          |    |--*Eolampas’ antecursor Duncan & Sladen 1882K66
          |    |--*Petalaster’ maresi Cotteau 1885K66
          |    `--*Ottiliaster’ pusillus Penecke 1885K66
          `--+--Pliolampas Pomel 1888 (see below for synonymy)K66
             |    |--*P. gauthieri (Cotteau 1880) [=Echinolampas gauthieri, *Plesiolampas gauthieri]K66
             |    |--P. baixadoleitensis (Maury 1934) [=Breynella baixadoleitensis]SG93
             |    |--‘Echinolampas’ elegantulus Cotteau 1883 [=*Milletia elegantula]K66
             |    `--‘Pygorhynchus’ vassalli Wright 1855 [=*Breynella vassalli]K66
             `--Studeria Duncan 1891 (see below for synonymy)K66
                  |--*S. elegans (Laube 1869) [=Catopygus elegans]K66
                  |--*Phaleropygus’ oppenheimi de Loriol 1902K66
                  |--S. recens Agassiz 1879 [=*Hypselolampas recens]K66
                  `--‘Nucleolites’ subcarinatus Goldfuss 1826 [=*Tristomanthus subcarinatus]K66

Gitolampas Gauthier 1889 [=Bothriolampas Gauthier 1889; incl. Echanthus Cooke 1942, Gitolampopsis Checchia-Rispoli 1921]K66

Pliolampas Pomel 1888 [=Plesiolampas Pomel 1883 non Duncan & Sladen 1882; incl. Breynella Gregory 1891, Milletia Duncan 1891]K66

Pseudopygaulus Coquand 1862 [incl. Eolampas Duncan & Sladen 1882, Ottiliaster Penecke 1885, Petalaster Cotteau 1885 non Gray 1840]K66

Studeria Duncan 1891 [incl. Hypselolampas Clark 1917, Phaleropygus de Loriol 1902, Tristomanthus Bittner 1892]K66

*Type species of generic name indicated


[K66] Kier, P. M. 1966. Cassiduloids. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt U. Echinodermata 3 vol. 2 pp. U492–U523. The Geological Society of America, Inc., and The University of Kansas Press.

[SG93] Simms, M. J., A. S. Gale, P. Gilliland, E. P. F. Rose & G. D. Sevastopulo. 1993. Echinodermata. In: Benton, M. J. (ed.) The Fossil Record 2 pp. 491–528. Chapman & Hall: London.

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