Tectonatica spec

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, Zootaxa 1770, pp. 1-40 : 27-29

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).

Figures

FIGURE 3: Photos of all egg masses used for molecular analysis (see Figure 1) in this study. For details concerning collection sites and the sequences amplified see Table 2. The pictures were taken immediately after the collars has been collected. DNA samples from egg masses were marked with C followed by a reference number when DNA was extracted directly from an egg mass; they were marked with L followed by a reference number if DNA extraction was performed from hatched larvae. Scale bars represent 0.5 cm.

FIGURE 8: A, Tectonatica sagraiana (Orbigny, 1842); B, Tectonatica rizzae (Philippi, 1844). Further details as in Figure 3. Scale bars represent 0.5 cm.

FIGURE 11: Naticid egg masses collected on Giglio Island. A / a, Neverita josephinia (Campese Bay); B / b, probably Tectonatica rizzae (Pt. delle Secche); C / c, Notocochlis dillwynii (Pt. delle Secche); D / d, Notocochlis dillwynii (Cala dell´Allume); E / e, Notocochlis dillwynii (Fenaio); F / f, Tectonatica sagraiana (Campese Bay); G / g, Naticarius hebraeus (Pt. del Morto); H-I, egg capsules in egg masses of T. sagraiana (10 days old); J-K, egg capsules in egg masses of N. josephinia (1 day old).