Alvania candasae Oliver & Gofas, 2022

Oliver, Joan Daniel, Gofas, Serge, Urgorri, Victoriano, Díaz-Agras, Guillermo & Templado, José, 2022, Rissoidae gastropods of the outer continental shelf and slope off Galicia (NW Spain), Zootaxa 5196 (1), pp. 1-45 : 21

publication ID

https://doi.org/ 10.11646/zootaxa.5196.1.1

publication LSID

lsid:zoobank.org:pub:1B12892E-D68F-4BFE-8E9A-7F19E220E73D

DOI

https://doi.org/10.5281/zenodo.7231953

persistent identifier

https://treatment.plazi.org/id/3F33D1C3-4EF1-44EE-8B46-18B62DE67207

taxon LSID

lsid:zoobank.org:act:3F33D1C3-4EF1-44EE-8B46-18B62DE67207

treatment provided by

Plazi

scientific name

Alvania candasae Oliver & Gofas
status

sp. nov.

Alvania candasae Oliver & Gofas View in CoL sp. nov.

( Fig. 13 View FIGURE 13 )

Type material. Holotype: SPAIN • 1 emPty shell ( Fig. 13 View FIGURE 13 ); 42° 51.20′N, 009° 43.85′W to 42° 52.97′N, 009° 44.25′W; 1861– 1177 m; 15–30 Sep. 2008; DIVA-Artabria II DRNp-26; MHNS, deposit number: MHN-USC-10118 GoogleMaps . Paratypes: SPAIN • 3 sh (ParatyPes 1–3); 44° 11.652′N, 008° 58.152′W to 44° 11.539′N, 008° 57.574′W; 908–1106 m; 15–24 Jul. 2008; A SELVA DRN-7 GoogleMaps ; MHN-USC, deposit number: MHN-USC-10118; • 5 sh (1 juv) (paratypes 4–8); 43° 19.92′N, 009° 38.13′W to 43° 21.25′N, 009° 37.11′W; 1267–1286 m; 15–30 SeP. 2008; DIVA-Artabria II EBS-15 GoogleMaps ; MNCN 15.05 About MNCN GoogleMaps /200226.

Type locality: Muxía Canyon off W Galicia (42° 51.20′– 42° 52.97′ N; 009° 43.85′– 009° 44.25′W, 1177–1861 m) GoogleMaps .

Derivatio nominis: This species is dedicated to Dra. María Candás who has participated in the collection of samples in all oceanographic campaigns and has participated in the sorting of the samples and procedure of the species obtained.

Description. Small oval shell (1.8 x 1.1 mm in the holotype with somewhat more than 4 whorls) with moderately high conical sPire and blunt aPex ( Fig. 13a View FIGURE 13 ), aPical angle of about 42°, colour white. APerture Pyriform, Pointed at union with penultimate whorl, height 0.7 mm (about 38% of total height). Teleoconch with slightly convex whorls and channeled suture highlighted by a subsutural spiral depression ( Fig. 13o View FIGURE 13 ). Sculpture of weak, axial ribs almost orthocline, at about 10° with sPire axis; flat sPiral cords towards the base and minute sPiral striae ( Figs. 13j–k View FIGURE 13 ) also in the channeled suture ( Fig. 13e View FIGURE 13 ). On the body whorl there are about 30 ribs disappearing at the base. Rounded aperture with a thin edge, not thickened. Umbilicus open but partly covered by columellar lip; umbilical area with chink and coarse growth lines ( Figs. 13a, f, l View FIGURE 13 ).

Paucispiral protoconch of just over a whorl ( Figs. 13b, c, g, m View FIGURE 13 ) with inconspicuous sculpture of very weak axial threads and scattered or slightly spirally aligned microtubercles ( Figs. 13d, i View FIGURE 13 ). At the base of the nucleus certain roughness can be observed under high magnification ( Fig. 13h View FIGURE 13 ).

Soft parts and radulae unknown.

Remarks. Alvania candasae sp. nov. seems to belong to the same group as A. electa , A. porcupinae , A. adinogramma Bouchet & Warén, 1993 and A. cancapae Bouchet & Warén, 1993 . This last species, from off Morocco and Canary and Madeira Islands, is larger (more than 2 mm) with less numerous and more pronounced axial ribs, as well as A. electa , whose protoconch has a microsculpture of fine spiral threads and microgranules, different from that of the new species. Alvania porcupinae is also larger (more than 2 mm), its suture is not so channeled and its protoconch surface is smooth. A. adinogramma has more convex whorls, less ribbed suture, and a conspicuous spiral sculpture throughout the shell. Alvania adiaphoros Bouchet & Warén, 1993 is somewhat larger, with axial ribs more widely separated and not extending on the abapical part of the body whorl, and its channeled suture is less pronounced. Also, A. microstriata and A. seinensis , from Madeira and Seine Seamount, resemble this new species in their shape and size, but they have a shallow subsutural furrow instead of a channeled suture and their protoconch surface are densely covered by very fine microtubercles.

Nine empty shells were found in samples collected between 900 and 1600 m.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Littorinimorpha

Family

Rissoidae

Genus

Alvania

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