Notocochlis dillwynii (Payraudeau, 1826)

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 : 22-23

Notocochlis dillwynii (Payraudeau, 1826) [new comb.]— Fig. 6 B [egg mass: Figs. 3 , 11 C, D, E, c, d, e]

Natica dillwynii Payraudeau, B. -C. 1826. Catalogue descriptif et méthodique des annelides et des mollus- ques de l'ile de Corse; avec huit planches representant quatre-vingt-huit especes, dont soixante-huit nouvelles. Béchet, Paris, 218 pp., p. 120, pl. 5, figs. 27-28.

Natica dillwynii Payraudeau, 1826 . Weinkauff (1867), p. 248; Kobelt (1901), p. 81, pl. 49, Figs. 11-10 ; Hidalgo (1917), p. 483; Villa (1986b), pp. 179-180, p. 180; Alf et al. (1993), p. 190; Demir (2002), p. 110; Terreni (1981), p. 31

+ Nacca fasciata Risso 1826 . Sabelli et al. (1990), p. 169

Natica (Naticarius) dillwynii (Payraudeau, 1826) . Settepassi (1972), p. 23, pls. 4, 8

+ Tectonatica operculata farolita Nordsieck, 1973 . Bouchet & Warén (1993), p. 759

Naticarius (Naticarius) dillwini (Payraudeau, 1826) . Schiró (1978c), p. 3, fig. 1 (first row)

Naticarius dillwynii (Payraudeau, 1826) . Nordsieck (1982), p. 186, pl. 57, fig. 63.13 (Ibiza, Mediterraneo); Sabelli & Spada (1980), pp. 2-3, figs. 4a-b; Poppe & Goto (1991), p. 119, pl. 17, fig. 23, Barash & Danin (1992), p. 108

Description

Size: Up to 19.7 mm height (Djidjelli, France; MNHN, Paris). Specimens (n = 30) from Giglio Island: 5.5 - 17.0 mm (mean: 11.0 mm ± 0.6 mm) height; 5.2 – 16.8 mm (mean: 10.8 ± 0.6 mm) width. Ratio [h/w] = 1.03 ± 0.006. Aperture approximately 80% of shell height. The larval shell has a diameter of approx. 135 µm. General shape: Globose, slightly elevated spiral whorls, rather thin, 5.5 [teleoconch: 4] whorls. Sculpture: Axial wrinkles on shoulder; fine growth striae.

Shell color: Whitish-cream, yellowish-grey or light-brown with three distinct horizontal white bands with chevron-shaped brown marks; one band on shoulder, one around periphery, broadest band with somewhat fuzzy marks encircles umbilicus; in addition, unmarked yellowish band below suture. Protoconch: Dark protoconch, 1.5 embryonal whorls.

Aperture & outer lip: Aperture half-moon shaped, oblique, angled at the top; outer lip simple, sharp; basal lip slightly drawn out.

Umbilical area: Open umbilicus; relatively large, centrally located whitish funicle; funicular callus slightly enlarged, merging anteriorly with columellar callus which is tapering towards basel lip; distinctive sulcus; distinct, whitish parietal callus.

Operculum: Calcareous, glossy, with a deep, broad (as broad as ribs) furrow in front of two distinctive, massive ribs separated by a narrow ridge next to outer lip.

Animal: Propodium and mesopodium translucent whitish-grey, speckeled with red, irregularly shaped dots; dots more dense on propodium, which appears darker colored than mesopodium; when extended, mesopodium twice the length of the shell; propodium about as long as the shell; tentacles nearly as long or longer than propodium, colored with red dots on a whitish grey background, similar to coloration of foot.

Egg mass: Rigid, multispiral, even-walled coil of mucus-cemented sand grains ( Figs. 3 , 11 C,D,E/c,d,e), 3–5 circles; outer diameter 20–40 mm (N = 6; mean: 30.25 mm ± 7.961 [SD]).

Differential diagnosis: This species cannot be confused with any other Mediterranean species; distinct morphological features include the operculum with the furrow in front of two distinctive, thick ribs next to the outer lip; the reddish color pattern of the shell and foot, the long tentacles, and the elongated mesopodium.

Geographical distribution

Giglio Island: Cala dell´Allume (4), Pt. del Corvo (5), Pt. del Morto (6), Cannelle Bay, Pt. della Campana (7), (8), Pt. delle Secche (3)

General distribution: Common in the entire Mediterranean Sea and the Eastern Atlantic, South to Ghana (Villa 1986), and offshore to the Cape Verde Islands ( Rolán 2005).

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 6: A, Naticarius hebraeus (Martyn, 1786); B, Notocochlis dillwynii (Payraudeau, 1826). 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).