- Mar 2021
Was the type specimen for Cassidula nucleus (Gmelin, 1791) collected by James Cook (1728-1779)? The type specimen with catalog number NHMD-155242 is collected at Tahiti and James Cook visited Tahiti during all of his three voyages (1768-1771; 1772-1775; 1776-1779).
Cassidula nucleus (Gmelin, 1791) https://www.gbif.org/species/7932657 https://en.wikipedia.org/wiki/Cassidula_nucleus http://www.wikidata.org/entity/Q3695551 http://www.marinespecies.org/aphia.php?p=taxdetails&id=549377 http://www.marinespecies.org/aphia.php?p=taxdetails&id=882010
original description (of Helix nucleus Gmelin, 1791) Gmelin J.F. (1791). Vermes. In: Gmelin J.F. (Ed.) Caroli a Linnaei Systema Naturae per Regna Tria Naturae, Ed. 13. Tome 1(6). G.E. Beer, Lipsiae [Leipzig]. pp. 3021-3910. , available online at http://www.biodiversitylibrary.org/item/83098#5 page(s): 3193
Original description of Helix nucleus Gmelin, 1791: "Nucleus. 255. H. tefta imperforata ovata glauca transverfim ftriata: cingulis atris, apertura finuola. Martin univ. Conch. 2. t. 67. fig. exter. Habitat in Tahiti."
The first voyage (1768–1771) of James Cook arrived at Tahiti on 13 April 1769. The second voyage (1772–1775) of James Cook also landed at Tahiti to resupply in 1774. And again during his third voyage (1776–1779). https://en.wikipedia.org/wiki/James_Cook
Systema Naturae was originally published in 1735. But does not include Helix nucleus. The 10th edition 1758 does not include Helix nucleus. The 12 edition (1766-68) and last edited by Carl Linnaeus (1707-1778) does not include Helix nucleus. While the 13th edition edited by Johann Friedrich Gmelin between 1788 and 1793 does include Helix nucleus in volume 1 part 1 published in July 1788. https://en.wikipedia.org/wiki/Systema_Naturae
The type specimen held at Zoological museum of the the Natural History Museum of Denmark with catalog number NHMD-155242 is indicated as collected by James Cook at Tahiti. As the type specimen for Helix nucleus Gmelin, 1791, it must have been collected before 1791.