Summary: | Fig. 16. A–C. Alkaidia sumralli Blake & Reid, 1998 (NHMUK EE15225). A–B. Abactinal (A) and actinal (B) views of well-preserved individual, retaining spines and pedicellariae. C. Enlargement of ambulacral groove, showing spines and duck-bill pedicellariae. — D. Zoroaster fulgens Thomson, 1873, duck-billed pedicellaria of a zoroasterid (A.S. Gale collection, unregistered). Provenance: A–C. Grayson Formation, Graysonites wacoense ammonite Zone, Dottie Lynn Lane, Fort Worth, Texas, USA (for details of locality, reference is made to Hess 2015 and Gale et al. 2021). D. Recent, Rockall Trough, northeast Atlantic. Scale bars: A–B = 50 mm; C = 5 mm; D = 0.5 mm.
|