The Echinoid Directory

Homoeaster Pomel, 1883, p. 44

[=Ornithaster Cotteau, 1886, p. 72, type species Ornithaster evaristei Cotteau, 1886; = Barnumia Cooke, 1953, p. 30, type species Barnumia browni Cooke, 1953; = Inflataster Anthula 1899, p. 62, type species Inflataster abichi Anthula, 1899 ]

Diagnostic Features
  • Test inflated, ovate typically with faint anterior sulcus; posterior face truncate. Test thick-shelled.
  • Apical disc ethmophract with four gonopores.
  • Frontal ambulacrum shallowly depressed adapically and in a distinct groove adorally. Pore-pairs small and oblique; not differentiated adapically.
  • Paired ambulacra subpetaloid; slightly depressed; parallel-sided and open distally. Posterior petals shorter than anterior petals. Pore-pairs weakly elongate.
  • Peristome small and pentagonal; angled obliquely towards the front.
  • Labral plate longitudinally elongate; extending to midway down ambulacral plate 2. Sternal plates not much longer; median suture vertical; subsequent plating biserial.
  • Periproct small and towards top of posterior truncate face.
  • Peripetalous fasciole present; passing high up on the test behind the apical disc and dropping to become inframarginal around the anterior. Passing a few plates below the ends of the petals.
  • Aboral tuberculation consisting of small scattered tubercles set in a groundmass of granules.
Distribution
Upper Cretaceous (Coniacian-Maastrichtian) to Palaeocene (Danian); Europe, former SSU, North Africa, Greenland, Japan, Caribbean.
Name gender masculine
Type
Homoeaster tunetanus Pomel, 1883, p. 44, by original designation.
Species Included
  • H. tunetanus Pomel, 1883; Coniacian, Tunisia, Spain.
  • H. evaristei (Cotteau, 1886); Campanian, Maastrichtian-Danian, Europe, former Soviet Union, North Africa, Greenland, Mozambique.
  • H. sulcatus Nisiyama, 1968; Maastrichtian, Japan.
  • H. petaloides Lambert, 1924; ?Maastrichtian, Algeria, Coniacian, Tunisia.
  • H browni (Cooke, 1953); Campanian, Guatamala
  • H. abichi Anthula, 1899; Senonian, Senegal, Caucuses
Classification and/or Status

Spatangoida, Hemiasterina, Aeropsidae.

Monophyletic?

Remarks

Ornithaster is supposed to differ from Homoeaster in having circular rather than slightly elongate pore-pairs aborally. It also has no frontal sulcus. However, the difference is slight and the two were synonymized by Smith & Jeffery (2000).

Pomel, A. 1883. Classification méthodique et genera des Échinides vivante et fossiles. Thèses présentées a la Faculté des Sciences de Paris pour obtenir le Grade de Docteur ès Sciences Naturelles, 503, 131 pp. Aldolphe Jourdan, Alger.

Smith, A. B. & Jeffery, C. H. 2000. Maastrichtian and Palaeocene echinoids: A key to world faunas. Special Papers in Palaeontology 63, 1-403.