Yoldiella lucida Loven 1846

Yoldiella lucida (Lovén, 1846)

Fig. 2 o–q

Yoldia lucida Lovén, 1846 (p. 188).

Yoldia lucida Loven—Seguenza 1877 (p. 1179, pl. 5, fig. 26).

Leda lucida Lovén—Jeffreys 1879 (p. 578); Hidalgo 1917 (p. 375).

Yoldiella lucida (Lovén) Verrill and Bush—Verrill & Bush 1898 (p. 861, pl. 77, fig. 2; pl. 80, fig. 3).

Yoldiella lucida (Lovén) — Tebble 1966 (p. 29, text-fig. 15b); Laghi 1986 (p. 184, pl. 7, figs. 3–4; text-fig. 1f).

Yoldiella lucida lucida (Loven, 1846) — Nordsieck 1969 (p. 10, pl. 1, fig. 02.40).

Yoldiella lucida (Loven) — Di Geronimo & Panetta 1973 (p. 94, pl. 3, fig. 6).

Portlandia (Yoldiella) lucida (Lovèn, 1846) — Bogi et al. 1982 (p. 10, fig. 4).

Yoldiella lucida (Lovén, 1846) — Thomsen & Vorren 1986 (pl. 3, figs. A, C (top)); Poppe & Goto 1993 (p. 39, pl. 2, fig. 6); Giribet & Peñas 1997 (p. 80, fig. 86); Giannuzzi-Savelli et al. 2001 (p. 58, figs. 56–57); La Perna 2003 (p. 26, pl. 3, fig. 3); Repetto et al. 2005 (p. 284, bottom right fig.); Oliver et al. 2016 (online resource).

Diagnostic characters. Subrectangular, inequilateral shell with sligthly longer anterior side; evident, nearly pointed postero-dorsal angulation; shiny outer surface with faint growth lines only. Prodissoconch: shell type ST- 1A; P-1: length about 220 µm; ellipsoidal outline; low convex profile; surface apparently smooth; transition to the nepioconch well marked.

Remarks. As for Yoldia minima (see above), the occurrence in some samples of (rare) fresh shells retaining traces of ligament allow to include Yoldiella lucida among the Recent Mediterranean fauna (cf. La Perna 2003).

Occurrence. Box corer samples BC04 (5 specimens), BC05 (5), BC66 (4), BC67 (2), BC71 (3), BC72 (49); cores BC04 (4), BC05 (7), BC21 (8), BC51 (6), BC72 (11). Maximum length: 5 mm.

Distribution and habitat. The species is widely distributed from Arctic waters (also entering Norway fjords) to both sides of the northern Atlantic and the Mediterranean Sea, dwelling on muddy bottoms from shelf depths down to 3500 m (Buhl-Mortensen & Høisaeter 1993; Poppe & Goto 1993; Pons-Moyà & Pons 1999; Oliver et al. 2016). It was reported as a component of Abra-Nucula biocoenosis in the bathyal of Taranto (Di Geronimo & Panetta 1973). In the Santa Maria di Leuca CWC biotope, it was found on the muddy bottoms around the coral colonies (Mastrototaro et al. 2010), being abundant in mollusk mud, and common in foraminifer mud thanatofacies (Rosso et al. 2010).

Fossil record. Pliocene (Astian) of southern Italy (Seguenza 1877); Pleistocene of Denmark, Norway and the Mediterranean (Di Geronimo & Bellagamba 1985; La Perna 2003; Petersen 2004).