{{Short description|Species of gastropod}} {{Use dmy dates|date=January 2024}} {{Speciesbox | taxon =Cymatosyrinx johnsoni | image = Cymatosyrinx johnsoni 001 bis.jpg | image_caption = Shell of ''Cymatosyrinx johnsoni'' (holotype) | authority = Arnold, 1903 | synonyms_ref = <ref name="WoRMS" /> | synonyms = ''Drillia johnsoni'' <small>R. Arnold, 1903</small> | display_parents = 3 }}

'''''Cymatosyrinx johnsoni''''' is a species of sea snail, a marine gastropod mollusk in the family Drilliidae.<ref name="WoRMS">Rosenberg, G. (2015). Cymatosyrinx johnsoni. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581084 on 22 August 2016</ref>

==Description== The length of the shell attains 32 mm, its diameter 11 mm

(Original description) This medium-sized, turreted shell comprises eight or nine nearly flat whorls. Each whorl is adorned with approximately thirteen prominent, rounded, and equally spaced oblique ribs, which originate from the anterior and extend two-thirds across the whorl before becoming nearly obsolete. A distinct sutural band occupies the upper third of each whorl, while the lower portion features five deep, channel-like sulcations (channel-like depression on the surface of the shell). The sutural band itself is marked by strong, oblique incremental lines, and the suture is appressed and undulating.

The aperture is subelliptical with an arcuate outer lip. It presents a narrow, rather deep posterior sinus and a short, recurved anterior sinus. The columella is incrusted. The convex body whorl extends downward, exhibiting revolving sulcations on its lower part, where transverse ridges are obsolete. <ref>{{cite journal |last1=Arnold |first1=R. |title=The paleontology and stratigraphy of the marine Pliocene and Pleistocene of San Pedro, California |journal=Memoirs of the California Academy of Sciences |date=1903 |volume=3 |page=206 |url=https://www.biodiversitylibrary.org/page/3136160 |access-date=18 September 2025}} {{PD-notice}}</ref>

==Distribution== This species occurs in the Western Atlantic Ocean.

==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.

{{Taxonbar|from=Q3734509}}

{{DEFAULTSORT:Cymatosyrinx Johnsoni}} johnsoni Category:Gastropods described in 1903 Category:Taxa named by Ralph Arnold (palaeontologist)