Alkaidia Blake & Reid, 1998

Alkaidia Blake & Reid, 1998: 529, fig. 8.

Type species

Alkaidia sumralli Blake & Reid, 1998, by original designation.

Diagnosis

Terminasteridae with elongated rhombic superomarginals directed obliquely towards radials; inferomarginals with tall, distally swollen central spine bases and prominent groove for spine attachment; radials (except primary radial) rhombic in outline.

Assigned species

In addition to the type species, A. megaungula Ewin & Gale, 2020 .

Remarks

Alkaidia ranges from the Barremian to Cenomanian and appears to be restricted to the western Tethys.