Gastecrinus vinealis, Roux & Philippe, 2021

Roux, Michel & Philippe, Michel, 2021, Early Miocene stalked crinoids (Echinodermata) from the southern Rhodanian basin (southeastern France). Paleoenvironments and taxonomy, Zootaxa 5052 (3), pp. 301-331 : 326-327

Gastecrinus vinealis n. gen., n. sp.

Fig. 12L

Type material. A single aboral cup ( MHNL 20062729) .

Etymology. From Vigne, reference to the type-locality Vigne Gaste.

Diagnosis. As in description.

Type stratum. Just above the calcareous limestone dated Late Burdigalian.

Type locality. Vigne Gaste (Istres).

Description. Dorsal cup of inverted truncated cone-shape, wider than high, external surface convex and smooth, conspicuous stalk socket forming a conical depression, sutures between cup plates indistinct, adoral D 6.11 mm, stalk socket D 2.45 mm, estimated H 4.3 mm. Adoral part recrystallized and worn, location of radials suggested by a discrete relief allowing to estimate a maximum width of about 2.6 mm.

Remark. This aboral cup differs from that of the Rhizocrinidae in having large radials suggesting robust arms and a very large stalk socket. The poor preservation of its adoral side does not allow to attribute it to a known post- Paleozoic taxon.

Occurrence. Only known from Vigne-Gaste (Istres), Late Burdigalian.

Figures

FIGURE 12. Isocrinid and rhizocrinid columnals. A–K: from Palais des Papes in Avignon; A–C: Metacrinus berthei (MHNL 20.062719), A–B: symplexies with anomalous 4-symmetry, C: distal internodal from a young individual; D–F: Papacrinus avignonensis n. gen., n. sp. (MHNL 20.062726), D: oblique distal view, E–F: oblique proximal view, F: close up of cirrus socket; G–K: Paraconocrinus rhodanicus n. sp. (MHNL 20.062727), G–H: columnal from dististele, G: proximal view, H: close up of fulcral ridge, oblique view, I: columnal from middle mesistele, J: columnal from proximal dististele, proximal view, K: columnal from proximal dististele, side distal view; L: Gastecrinus viticolis n. gen., n. sp. from Vigne Gaste (Istres), aboral cup (MHNL 20.062729). Scale bar equals 1 mm in A–F and L, 0.5 mm in G and I–K, 0.1 mm in H.