The Echinoid Directory

Eurypatagus Mortensen, 1948, p. 133

Diagnostic Features
  • Test ovate without anterior sulcus; posterior face short and truncate. Test flattened in profile with flat base.
  • Apical disc ethmolytic, with 4 gonopores. Madreporic plate projecting beyond the posterior ocular plates. Anterior of centre.
  • Anterior ambulacrum narrow and flush; pore-pairs small, simple isopores.
  • Other ambulacra petaloid and flush. Lateral petals flexed anteriorly and extending to ambitus; almost at 180 degrees. Posterior petals also extending to ambitus and only weakly diverging. Pore-pairs conjugate; no occluded plates distally.
  • Periproct large; on short, steeply inclined truncate face; bound on oral side by paired Iamb plates 4a/b.
  • Peristome large and kidney-shaped; rather distant from the anterior border.
  • Phyllodes extremely well developed in lateral ambulacra.
  • Plastron plating: labral plate very long and wedge-like; extending to 4th ambulacral plate; may be disjunct in some species. Sternal plates short and triangular; tubercle-free. Episternal plates symmetrically paired; strongly indented to rear by ambulacral plates 6-8.
  • Scattered primary tubercles in interambulacral zones over aboral surface, especially anteriorly. Areoles weakly indented but not sunken.
  • On oral surface lateral interambulacra with large, aligned tubercles with sunken areoles.
  • Plastron short and triangular; primary tubercles confined to very posterior section (sternal plates almost naked).
  • No fascioles as adult.

Recent, Indo-Pacific.

Eurypatagus ovalis Mortensen, 1948, p. 133, by original designation.
Species Included
  • E. ovalis Mortensen, 1948; Recent, Philippines.
  • E. parvituberculatus (Clark, 1924); Recent, S Africa.
  • E. grandiporus Mortensen, 1948; Recent, Cape Gardafui.
  • Classification and/or Status

    Spatangoida, Micrasterina, unnamed taxon 2.



    Differs from Maretia in having distally open petals which are narrow with narrow perradial zones. Resembles Platybrissus but can be distinguished in having a different shaped peristome, longer petals and better developed phyllodes.

    Mortensen, T. 1950. A monograph of the Echinoidea. V. Spatangoida 1. C. A. Reitzel, Copenhagen.