The Echinoid Directory

Spatagobrissus Clark, 1923, p. 402

Diagnostic Features
  • Test ovate without anterior sulcus; posterior face forming a rounded point. Test low domal in profile.
  • Apical disc ethmophract with four gonopores; central. Gonopores situated on inner half of genital plates.
  • Anterior ambulacrum flush and narrow with uniserial and undifferentiated pore-pairs.
  • Paired ambulacra petaloid aborally; flush and bowed (closing distally). Anterior petals longer than posterior petals; pore-pairs conjugate. The anterior column of pore-pairs a little more rudimentary adapically than the posterior column in the anterior petals. Petals with wide perradial zone.
  • Peristome ovate and downward-facing. Labrum not projecting.
  • Labral plate longitudinally elongate; extending to ambulacral plate 2. Plastron plating with symmetical sternal plates; fully tuberculate. Episternal plates strongly indented by ambulacral plates at rear.
  • Periproct on posterior truncate face; well below mid-height in posterior view.
  • Subanal and peripetalous fascioles present. Peripetalous fasciole not indented; subanal fasciole shield-shaped and enclosing three ambulacral plates on either side.
  • Aboral tuberculation without larger primaries.
Distribution Middle Miocene to Recent, Australia, South Africa.
Name gender masculine
Type Spatagobrissus mirabilis Clark, 1923, p. 402, by original designation.
Species Included
  • S. mirabilis Clark, 1923; Recent, South Africa.
  • S. laubei (Duncan, 1877); Middle Miocene, Australia.
  • S. incus Baker & Rowe, 1990; Recent, Australia
  • S. dermodyorum Holmes, Ah Yee & Krause, 2005; Middle Miocene, Australia
Classification and/or Status

Spatangoida, Micrasterina, Maretiidae.

Monotypic.

Remarks

Differs from Eupatagus in having shorter petals lacking distinct primary tubercles aborally and in having a convex oral surface.

McNamara, K.J., Philip, G.M. & Kruse, P.D. 1986. Tertiary brissid echinoids of southern Australia. Alcheringa 10, 55-84.