Rictaxis punctocaelatus

{{Short description|Species of marine gastropod}} {{Use dmy dates|date=April 2024}} {{Speciesbox |taxon =Rictaxis punctocaelatus |image = Rictaxis punctocaelatus 01.jpg |image_caption = Shell of ''Rictaxis punctocaelatus'' |authority = (Carpenter, 1864) |synonyms_ref =<ref name="WoRMS" /> |synonyms = * ''Acteon punctocaelatus'' (P. P. Carpenter, 1864) * ''Acteon punctocaelatus vancouverensis'' I. S. Oldroyd, 1927 * † ''Acteon punctocaelatus var. coronadensis'' Stearns, 1899 * ''Tornatella punctocaelata'' P. P. Carpenter, 1864 (original combination) |range_map= Rictaxis punctocaelatus - distribution.jpg |display_parents = 3 }}

'''''Rictaxis punctocaelatus''''', common name '''Barrel shell''' or '''Carpenter's baby bubble''', is a species of sea snail, a marine gastropod mollusc in the family Acteonidae.<ref name="WoRMS">{{BioRef|WoRMS|title=''Rictaxis punctocaelatus'' (P. P. Carpenter, 1864) |id=581391|access-date=2 April 2024}}</ref>

==Description== The length of the shell attains 10 mm, its diameter 4.5 mm.

The oblong shell has a large, conoidal spire. It is white with two alternating broad ashy or brown zones. The outer lip and the columellar folds are whitish. The shell contains five convex whorls, separated by impressed and narrowly channelled sutures. The surface is sculptured throughout with spiral equidistant conspicuously punctate grooves, the raised intervals smooth except for a fine engraved line along the middle of each. There are about 26 grooves on the body whorl. The aperture measures two-fifths to two-thirds of the length of the shell. The ovate columella is strongly twisted with a spiral fold above and is obliquely truncated at base. The base of the shell is rounded.<ref>[https://www.biodiversitylibrary.org/item/77919#page/190/mode/1up G.W. Tryon, (1893) – Manual of conchology, structural and systematic : with illustrations of the species ser;1 vol. 15; Philadelphia, Published by the Author, Academy of Natural Sciences, 1879–1898] {{source-attribution}}</ref>

==Distribution== This species occurs in the Pacific Ocean off the western coasts of Canada, US and Mexico; also in the Atlantic Ocean off Brazil.

Fossils have been found in Pliocene strata in San Diego Bay.

==References== {{Reflist}} * Turgeon, D., Quinn, J. F., Bogan, A. E., Coan, E. V., Hochberg, F. G., Lyons, W. G., Mikkelsen, P. M., Neves, R. J., Roper, C. F. E., Rosenberg, G., Roth, B., Scheltema, A., Thompson, F. G., Vecchione, M., Williams, J. D. (1998). Common and scientific names of aquatic invertebrates from the United States and Canada: mollusks. 2nd ed. American Fisheries Society Special Publication, 26. American Fisheries Society: Bethesda, MD (USA). ISBN 1-888569-01-8. IX, 526 + cd-rom pp * Gosliner T.M. (1996). The Opisthobranchia. In: Taxonomic Atlas of the Benthic Fauna of the Santa Maria Basin and Western Santa Barbara Channel. The Mollusca Part 2 – The Gastropoda. Santa Barbara Museum of Natural History. volume 9: 161–213.

==External links== * [https://www.biodiversitylibrary.org/page/29370651 Carpenter, P. P. (1864). Supplementary report on the present state of our knowledge with regard to the Mollusca of the West Coast of North America. Reports of the British Association for the Advancement of Science. (1863) 33: 517–686.] * [https://www.biodiversitylibrary.org/page/15716288 Stearns, R. E. C. (1899). Description of a species of Actaeon from the Quaternary bluffs at Spanish Bight, San Diego, California. Proceedings of the United States National Museum. 21: 297–299, 1 fig] * [https://www.biodiversitylibrary.org/page/58081753 Oldroyd, I. S. (1927). The marine shells of the west coast of North America. Stanford University Publications in Geological Sciences. Volume 2, part 1, pp. 1–298, 29 pls] * [https://dx.doi.org/10.11646/zoosymposia.13.1.21 Valdés A. (2019). Northeast Pacific benthic shelled sea slugs. Zoosymposia. 13: 242–304.] * [http://researcharchive.calacademy.org/research/scipubs/pdfs/v55/proccas_v55_n02.pdf Pacific Coast nudibranchs, Supplement II. New species to the Pacific Coast and new information on the oldies. Proceedings of the California Academy of Sciences (4) 55(2): 11–54]

punctocaelatus Category:Gastropods described in 1864