Alvania angioyi van Aartsen, 1982

Amati, Bruno, Appolloni, Massimo, Giulio, Andrea Di, Scuderi, Danilo, Smriglio, Carlo & Oliverio, Marco, 2020, Revision of the Recent Alvania scabra (Philippi, 1844) complex (Mollusca, Gastropoda Rissoidae) from the Mediterranean Sea with the description of a new species, Zootaxa 4767 (3), pp. 415-458 : 447

Alvania angioyi van Aartsen, 1982

( Fig 19G, H )

Alvania angioyi van Aartsen, 1982: 4

Alvania watsoni —Dautzenberg, 1889: 51, pl. 3, fig. 8 (non Schwartz in R. B. Watson, 1873)

Other references.

Alvania angioyi ; Gofas, 1990: 113, figs 7a-c, figs 54–57; Ávila et al., 2002: 362, figs 41–43; Ávila, 2005: 264–267, pl. I, figs 1–13 and pl. II, figs 1–6; Martins et al., 2009: 41, figs 133, 134.

Type Material. Lectotype and 20 paralectotypes (coll. H. Fischer ex Dautzenberg, MNHN), type locality: Faial, bay of Horta 15–20 m depth, ‘Hirondelle sta 103’, Azores; paralectotypes from shore sand of Sao Miguel (Dautzenberg ex d’Aguyar, MOM) and from off Pico 38°34’30”N– 28°06’15”W, 1287 m (“Hirondelle” st. 112, MOM) ( Gofas, 1990).

Material examined. Azores: Ponta Delgada (Saõ Miguel Is.), beached, 7 sh ( JT, JDO); Biscoitos (Terceira), 1 m depth, 24 sh ( JT, JDO); unprecised locality, 18 m depth, 13 shells ( JT, JDO); unprecised data, 3 sh (MO).

Distribution. It is endemic to the Azores.

Remarks. A. angioyi lives in algal facies, more commonly in shallow waters, can reach 35 m depth ( Ávila, 2005: 51). The sculpture of the teleoconch is rather variable. It has three spiral cords above the aperture, rarely four. A common variant has weak or almost absent axial sculpture. It is very similar to A. canariensis , from which it differs in the protoconch sculpture, with marked spirals ( Ávila 2005).

Figures

FIGURE 19. Alvania spp. A, B. Alvania canariensis (d’Orbigny, 1840), Candelara la Caleta, Tenerife, Canary Island (Spain), height 2 mm (BA). C, D. Alvania sp. aff. canariensis (d’Orbigny, 1840), Gando Bay, Gran Canaria, Canary Islands (Spain), height 1. 85 mm (BA). E, F. Alvania canariensis (d’Orbigny, 1840), Monterosato coll. ex Mac Andrew coll., MCZR-M-30074, Canary Islands (Spain), height 1.8 mm with original label. G, H. Alvania angioyi vanAartsen, 1982, Biscoitos, Terceira (Azores), 1 m depth, height 1.7 mm (JT, JDO). I–K. Alvania sp., Monterosato coll. ex Mac Andrew coll., MCZR-M-30074, Azores, height 2 mm. L–P. Alvania grancanariensis Segers, 1999, Maspalomas, Gran Canaria, Canary Islands (Spain) height 1.7 mm (L: JT, JDO), 1.7 mm (M: JT, JDO), 1.85 mm (N–P: JT, JDO).