Published November 28, 2024 | Version v1
Taxonomic treatment Open

Holopus Orbigny 1837

  • 1. Institut de Systématique, Evolution, Biodiversité (ISYEB) UMR 7205 CNRS-MNHN-SU-EPHE-UA, Muséum national d'Histoire naturelle, 57 rue Cuvier, 75005 Paris, France.
  • 2. Institut de Systématique, Evolution, Biodiversité (ISYEB) UMR 7205 CNRS-MNHN-SU-EPHE-UA, Muséum national d'Histoire naturelle, 57 rue Cuvier, 75005 Paris, France. & Institut de Systématique, Evolution, Biodiversité (ISYEB) UMR 7205 CNRS-MNHN-SU-EPHE-UA, Muséum national d'Histoire naturelle, BP 225, 29182 Concarneau Cedex, France.
  • 3. Institut de Systématique, Evolution, Biodiversité (ISYEB) UMR 7205 CNRS-MNHN-SU-EPHE-UA, Muséum national d'Histoire naturelle, BP 225, 29182 Concarneau Cedex, France.

Description

Genus Holopus Orbigny, 1837

Type-species. Holopus rangii Orbigny, 1837, by monotypy.

Remarks. For main discriminating characters between Holopus and Cyathidium, see Table 3. H. fabianii sp. nov. and H. spileccense are the only fossil species of Holopus for which both the aboral cup and brachials are described. H. plaziati is known only from brachials, and the Campanian species in Jagt et al. (2010) is known exclusively from a single aboral cup. We here present the first description of well-differentiated keystone plates as well as distal brachials in a fossil Holopus species.

Included fossil species and occurrences. Holopus fabianii sp. nov. (lower Lutetian of Chiampo Valley, north-eastern Italy), H. plaziati (lower Ypresian, Corbières, southern France), H. spileccense (lower Ypresian, Spilecco Hills near Bolca, north-eastern Italy), Holopus sp. in Jagt et al. (2010) (upper Campanian, Kronsmoor, northern Germany).

Stratigraphic distribution. Upper Campanian–Recent.

Notes

Published as part of Martinez-Soares, Pablo, Roux, Michel, Giusberti, Luca, Gatto, Roberto, Eléaume, Marc & Améziane, Nadia, 2024, New Eocene species of the crinoid genera Holopus and Cyathidium (Cyrtocrinida: Holopodidae) from north-eastern Italy, pp. 401-437 in Zootaxa 5541 (4) on page 417, DOI: 10.11646/zootaxa.5541.4.1, http://zenodo.org/record/14241160

Files

Files (1.5 kB)

Name Size Download all
md5:c0ef6802a4153de260b6806634ae8ed2
1.5 kB Download

System files (13.5 kB)

Name Size Download all
md5:7eaaa71b0906d056523d79ee2177a6db
13.5 kB Download

Linked records

Additional details

Biodiversity

References

  • Jagt, J. W. M., Neumann, C. & Girod, P. (2010) First record of a holopodid crinoid from the late Campanian white chalk facies of northern Germany. In: Reich, M., Reitner, J., Roden, V. & Thuy, B. (Eds.), Echinoderm Research 2010. 7 th European Conference on Echinoderms, Gottingen, 2 - 9 October 2010, Abstract Volume and Field Guide to Excursions. Universitatsdrucke Gottingen, Gottingen, pp. 59 - 60.