Atlantica (Canaridiscus) anagaensis Ibáñez & D. Holyoak, 2011

Yanes, Yurena, Holyoak, Geraldine A., Holyoak, David T., Alonso, Maria R. & Ibáñez, Miguel, 2011, A new Discidae subgenus and two new species (Gastropoda: Pulmonata) from the Canary Islands, Zootaxa 2911, pp. 43-49 : 45

publication ID	https://doi.org/ 10.5281/zenodo.203498
DOI	https://doi.org/10.5281/zenodo.6183703
persistent identifier	https://treatment.plazi.org/id/3D4B87E5-FFD6-C71B-8DBA-8D5F77FEF83E
treatment provided by	Plazi
scientific name	Atlantica (Canaridiscus) anagaensis Ibáñez & D. Holyoak
status	sp. nov.

Treatment

Atlantica (Canaridiscus) anagaensis Ibáñez & D. Holyoak , sp. nov.

Type locality. Montaña Tafada, Anaga, Tenerife. UTM: 28 RCS 8761, 650 m altitude.

Holotype ( Fig. 3 View FIGURE 3 E; shell). TFMC (MT 0427). Leg. M. Valido, 14 November 1987.

Paratypes. 8 alcohol specimens and 5 shells, collected at the type locality, deposited in AIT.

Etymology. The specific epithet derives from the Anaga mountains.

Distribution and habitat ( Fig. 1 View FIGURE 1 ). Endemic to Tenerife. It has been collected only at the type locality, in rotten trunks of tree heath Erica arborea Linnaeus.

Description. Shell small ( Fig. 2 View FIGURE 2. A, a B), fragile, flattened, discoidal, with 5¾–6¼ uniformly convex whorls, regularly increasing in size, and deep sutures; base excavated with a widely open umbilicus, which reaches nearly onethird of the shell maximum diameter; aperture rounded, almost circular but slightly ovate in the columellar zone; peristome simple, acute, without parietal callus, parietal and columellar lip terminations widely separated. Shell colour brown with small pale-brown patches. Protoconch smooth, with about 1¾ whorls. Teleoconch regularly ribbed, with about 5 thick radial ribs/mm.

Genital system ( Fig. 4 View FIGURE 4 A–D; four specimens dissected). Atrium short. Distal genital system with a ring ( Fig. 4 View FIGURE 4 A), similar to that of A. saproxylophaga . Penis tubular, long and folded, occupying about one-half of the body whorl length ( Fig. 4 View FIGURE 4 A, B), but reaching about 45 mm in length when extended ( Fig. 4 View FIGURE 4 B). Penis thickest in its proximal part, intermediate in the middle part, and thinnest in the distal part; penial cavity occupied mainly by a thick pilaster, the penial cavity being small. Entrance to vas deferens close to insertion of penial retractor muscle. Wall of the proximal end of penis with an inner, apparently muscular thickening inside the point where the penial retractor muscle inserts on the outside ( Fig. 4 View FIGURE 4 D). Penial retractor long, running close to columellar muscle pack but shorter than the pack muscles and with single attachment to the visceral tegument. Bursa copulatrix small ( Fig. 4 View FIGURE 4 B); bursa duct long and very thin, without diverticulum. Hermaphroditic duct long, regularly kinked in the middle part ( Figs 4 View FIGURE 4 A, B). Albumen gland and talon short ( Figs 4 View FIGURE 4 A, C).