The Echinoid Directory

Contributed by Andreas Kroh, August 2010

Araeolampas Serafy, 1974, p. 43

Diagnostic Features
  • Test large, ovate with shallow anterior sulcus; depressed in profile; base flattened.
  • Apical disc ethmolytic, with 4 gonopores.
  • Ambulacrum non-petaloid and flush with interambulacra.
  • Pore-pairs rudimentary (single or double) and placed obliquely near perradial suture.
  • Periproct on short vertical truncate face.
  • Labral plate narrow and strongly elongated, Paired sternal plates with tuberculation confined to posterior part only.
  • Aboral tuberculation mostly fine and uniform but with a few large primary tubercles sunken in camellae in columns 1b, 2a, 3b, 4a and adapically along the midline of interambulacrum 5. Primary tubercles crenulate, perforate and forming a slight internal ampullae.
  •  Peripetalous and subanal fasciole present.
  • Tridentate, rostrate and triphyllous pedicellariae present.
  • Spheridia not in pits.
Distribution Recent; Circumtropical.
Name gender feminine
Type Homolampas fulva A. Agassiz, 1879. by original designation.
Species Included
  • A. atlantica Serafy, 1974; Recent, N-Atlantic.
  • A. fulva (A. Agassiz, 1879); Recent, Central and Eastern Pacific.
  • A. glauca (Wood-Mason & Alcock, 1891); Recent, Indian Ocean.
  • A. hastata (A. Agassiz, 1898); Recent, Tropical Eastern Pacific.
  • A. rostrata (de Meijere, 1903); Recent, Indonesia.
Classification and/or Status Spatangoida, Micrasterina, Loveniidae or Maretiidae.
Remarks Araeolampas differs from Homolampas by the presence of a peripetalous fasciole, crenulate primary tubercles, presence of enlarged tubercles in adapical interambulacrum 5, and four genital pores (usually 3 in Homolampas). Furthermore Araeolampas in contrast to Homolampas is reported to lack globiferous pedicellariae.
Serafy, D. K. 1974. A new heart-urchin, Araeolampas atlantica, new genus, new species, from the North Atlantic and notes on the closely related Homolampas. Proceedings of the Biological Society of Washington 87, 41-48.