Tectonatica spec
Creators: name: Huelsken, Thomas
name: Marek, Carina
name: Schreiber, Stefan
name: Schmidt, Iris
name: Mann, Michael Holl-
Publisher: name: Zenodo
Year: 2008
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Littorinimorpha
Naticidae
Tectonatica
Tectonatica spec

description: Tectonatica spec., probably T. rizzae (Philippi, 1844) – Fig. 8 B [egg mass: Figs. 3, 11 B, b]
Natica rizzae Philippi, 1844. Nachtrag zum zweiten Bande der Enumeratio Molluscorum Siciliae. Zeitschrift für Malakozoologie, 1, 100–112. p. 108.
Natica rizzae Philippi, 1844. Weinkauff (1867), p. 254; Hidalgo (1917), p. 490; Schiró (1978b), p. 4, pl. 1 (second row); Poppe & Goto (1991), p. 121, pl 17, fig. 13; De Smit & Bába (2001), p. 98
+ Natica pyrrhosticta Dautzenberg & Fischer, 1896. Settepassi (1972), p. 22, Bouchet & Warén (1993), p. 764–767, figs. 1822–1823, Barash & Danin (1992), p. 109
Natica (Naticina) rizzae (Philippi, 1844). Kobelt (1901), p. 93, pl. 55, figs. 16–18
Natica (Lunatia) rizzae (Philippi, 1844). Settepassi (1972), p. 14, pl. 9
Lunatia rizzai (Philippi, 1844). Error of Schiró (1977b), p. 17, for Lunatia rizzae (Philippi, 1844)
+ Lunatia macilenta rizzae (Philippi 1844). Nordsieck (1982); p. 184, pl. 58, fig. 62.27
+ Natica settepassii Gaglini in Settepassi, 1985. Settepassi (1972), pls. 9, 10; Fernandez & Rolán (1993), p. 3; Bouchet & Warén (1993), pp. 764–767, figs. 1822–1823
+ Natica settepassii Gaglini in Settepassi, 1985 [= rizzae of authors, non rizzae Philippi, 1844]. sensu Sabelli, Sabelli et al. (1990), p. 169
Description
Size: Up to 13,7 mm m.o.d. (off Almeria, Spain; MHC#970515.5). Height 11 mm; width 10.5 mm. Ratio [h/ w] = 1.04. Aperture approximately 78% of shell height. The planctonic larval shell has a diameter of approx. 300 µm.
General shape: Globose, solid shell, 5 slightly convex whorls [teleoconch: 2.5]; similar to T. sagraiana. Sculpture: Minute axial and concentric striae.
Shell color: Glossy, whitish background, marked by numerous closely spaced, wavy, brown axial lines interrupted by a band below midline of body whorl; band formed by irregularly distributed, arrowhead-shaped marks, branching off from axial lines; band of large, dark-brown blotches below suture; additional narrow band with densely spaced arrowheads formed by kinks in axial lines occasionally found in upper third of body whorl; a band of fuzzy dark blotches encircles umbilical area.
Protoconch: Uncolored or slightly yellowish; 2.5 whorls (Bouchet & Warén 1993). Aperture & outer lip: Aperture half-moon shaped, oblique, lightly angled at top, rounded at bottom; outer lip simple.
Umbilical area: Columellar callus partly overhanging umbilicus from above, covering 2/3 of it; funicle absent; columellar callus brown, red, or purple, sometimes uncolored; border of umbilical canal tinged with brown; parietal callus thick, colored like columellar callus.
Operculum: Calcareous, smooth except for single broad rib on outer lip side.
Animal: Unknown
Egg mass: Flexible, coiled, paucispiral, mucus-cemented band of sand grains with inwardly cambered walls (Figs. 3, 11 B/b); 1.25 circles; outer diameter: 37.0 to 48.4 mm in four egg masses (N = 4; mean: 43.5 ± 5.9 mm [SD]).
Differential diagnosis: The shell morphology of T. sagraiana and T. rizzae shows many homologies. While T. rizzae seems to live in deeper water, shells collected in shallow water (<20 m depth) are always T. sagraiana. Principal distinguishing feature is the operculum that in T. sagraiana lacks a marginal rib that is found in T. rizzae; in addition, T. sagraiana lacks a subsutural band with regularly-spaced brown blotches that is present in T. rizzae.
Geographical distribution
Giglio Island: Pt. delle Secca (3)
General distribution: Distributed in most of the Mediterranean Sea with reports from the Aegean Sea (De Smit & Bába 2001); absent in the Adriatic Sea (Schiró, 1977). The species has also been reported from West Africa south to Angola (Fernandez & Rolán 1993), Cape Verde Islands (Morán et al. 1989).
description: Published as part of Huelsken, Thomas, Marek, Carina, Schreiber, Stefan, Schmidt, Iris & Mann, Michael Holl-, 2008, The Naticidae (Mollusca: Gastropoda) of Giglio Island (Tuscany, Italy): Shell characters, live animals, and a molecular analysis of egg masses, pp. 1-40 in Zootaxa 1770 on pages 27-29, DOI: 10.5281/zenodo.182119