Key echinoderm plates from the early Cretaceous of Blake Nose (ODP site 1049) with corresponding plates of Recent relatives.

<p>A: <i>Ophiolimna</i> sp. (Ophiacanthidae), lateral arm plate (LAP), Blake Nose (GZG.INV.78777). B: <i>Ophiolimna bairdi</i> (Lyman) (Ophiacanthidae), LAP, Recent, North Atlantic. C: Ophiohelinae gen. nov. (Ophiacanthidae), LAP (GZG.INV.78778), Blake Nose. D: <i>Ophiotholia spathifer</i> (Lyman) (Ophiacanthidae), LAP, Recent, Japan. E: Ophiohelinae gen. nov. (Ophiacanthidae), parasol spine (GZG.INV.78779), Blake Nose. F: <i>Ophiotholia spathifer</i> (Lyman) (Ophiacanthidae), parasol spine, Recent, Japan. G: <i>Ophioleuce</i> sp. (Ophioleucinae), LAP (GZG.INV.78780), Blake Nose. H: <i>Ophioleuce seminudum</i> Koehler (Ophioleucinae), LAP, Recent, Pacific. I: <i>Ophiomusium</i> sp. (Ophiolepididae), LAP (a: external, b: internal) (GZG.INV.78781), Blake Nose. J: <i>Ophiomusium lymani</i> (Wyville-Thomson) (Ophiolepididae), LAP (a: external, b: internal), Recent, North Atlantic. K: Benthopectinidae gen. nov., ambulacral (GZG.INV.78782), Blake Nose. L: <i>Pectinaster filholi</i> Perrier (Benthopectinidae), ambulacral, Recent, Atlantic. M: Benthopectinidae gen. nov., adambulacral (GZG.INV.78783), Blake Nose. N: <i>Pectinaster filholi</i> Perrier (Benthopectinidae), adambulacral, Recent, North Atlantic. O: Laetmogonidae gen. nov., body wall ossicle (lower side) (GZG.INV.45613), Blake Nose. P: <i>Laetmogone olivacea</i> Théel (Laetmogonidae), body wall ossicle (lower side), Recent, North Atlantic. Q: <i>Hemisphaeranthos</i> sp. (Myriotrochidae), body wall ossicle (upper side) (GZG.INV.45634), Blake Nose. R: <i>Myriotrochus rinkii</i> Steenstrup (Myriotrochidae), body wall ossicle, Recent, North Atlantic. S: (?)<i>Myriotrochus</i> sp. (Myriotrochidae), radial calcareous ring element (inner side) (GZG.INV.45623), Blake Nose. T: <i>Myriotrochus rinkii</i> Steenstrup (Myriotrochidae), radial calcareous ring element (inner side), Recent, North Atlantic. Scale bars equal 100 µm.