Montfort P. [Denys de]. (1808-1810). Conchyliologie systématique et classification méthodique des coquilles. <em>Paris: Schoell.</em> Vol. 1: pp. lxxxvii + 409 . Vol. 2: pp. 676 + 16 [1810 (before 28 May)]., available online at http://www.biodiversitylibrary.org/bibliography/10571
page(s): 338 [details]
Valdés, Á. (2008). Deep-sea "cephalaspidean" heterobranchs (Gastropoda) from the tropical southwest Pacific. In: Héros, V. et al. (eds) Tropical Deep-Sea Benthos 25. <em>Mémoires du Muséum national d'Histoire naturelle.</em> 196: 587-792. (look up in IMIS) [details]
Harry H.W. 1967. A review of the living tectibranch snails of the genus <i>Volvulella</i>, with descriptions of a new subgenus and species from Texas.
<i>Veliger</i>, 10: 133-147, available online at http://biodiversitylibrary.org/page/42413856 [details]
From editor or global species database
Taxonomy Volvulella versus Rhizorus: Unfortunately many shelled opisthobranchs have been named on the basis of their shells alone, and this is a case in point. For the last 100 years there has been an on-going debate, unhappily still unresolved, over the names Volvulella Newton, 1891 [type species Bulla acuminata Bruguiere, 1792] and Rhizorus Montfort, 1810 [type species R. adelaidis Montfort, 1810] and whether they are synonyms. The shells certainly look the same but as they were described only on the shell it is very difficult. On top of that, Mediterranean and North American workers seem to prefer Volvulella while workers on the European North Atlantic and Australian - New Zealand regions have opted for Rhizorus.
(note posted June 30, 2008 by W.B. Rudman in the Sea Slug Forum, Australian Museum, Sydney) [details]
Taxonomy This name should have priority over Volvulella but predominant usage is maintained herein until the above issue is settled. [details]