Tectonatica rizzae (Philippi, 1844)
Cantabrian Sea to Cabo Verde; Azores, Madeira and lusitanian seamounts to Mediterranean. Infralittoral to shelf depths (20-400m in Beck, Metzger & Freiwald; very rare above the 30m depth, rare to uncommon below). Predator on mobile preys.
Original taxon: Natica rizzae.
150-180m deep, Estepona, Málaga, Andalucia, S. Spain. 12mm.
Original pictures provided by J. M. Martin (ES).
(CC BY-NC-SA)
« Testa ventricoso-ovata, tenui, albida, lineis longitudinalibus ferrugineis confertissimis picta; strigis obscurioribus suturam, fasciis duabus albis interruptis anfractum ultimum cingentibus; umbilico subnudo; labio adnato, calloso, cum columella rufo. » – R. A. Philippi: “Nachtrag zum zweiten Bande der Enumeratio Molluscorum Siciliae”, Zeitschrift für Malakozoologie Jahrgang 1844, Hannover 1845, page 108.

Synonyms: pyrrhosticta, settepassii.
250m deep, on mud, Motril, Granada, Andalucia. 10,3mm.
Original pictures provided by J. M. Martin (ES).
(CC BY-NC-SA)
 

Here is the description of Natica pyrrhosticta (picture above) by Dautzenberg & Fischer after a specimen from the Azores:
 
« Shell fairly solid, globular, slightly transverse, tightly perforated. Surface smooth and shiny, showing only superficial growth streaks. Spire little salient, composed of four slightly convex whorls, the last very large, separated by a shallow suture. Aperture semilunar. Columella a little oblique, with a thick callus filling much of the umbilicus, which is reduced to a crescent-shaped slit. Labrum rounded, simple, sharp. This yellowish-white shell is decorated with brown longitudinal lines arranged in zigzags, subsutural blotches of the same shade, and with a large tawny peripheral zone. »

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