Yoldiella philippiana ( Nyst, 1845 )

Negri, Mauro Pietro & Corselli, Cesare, 2016, Bathyal Mollusca from the cold-water coral biotope of Santa Maria di Leuca (Apulian margin, southern Italy), Zootaxa 4186 (1), pp. 1-97 : 18-20

Yoldiella philippiana ( Nyst, 1845)

Fig. 3 d–f

Nucula tenuis Philippi, 1836 (p. 65, pl. 5, fig. 9).

Nucula philippiana Nyst, 1845 (p. 224, pl. 17, fig. 5).

Yoldiella lenticula philippiana (Nyst, 1871) — Nordsieck 1969 (p. 11, pl. 2, fig. 02.46).

Yoldiella philippiana ( Nyst, 1845) — Poppe & Goto 1993 (p. 40, pl. 2, fig. 8); Salas 1996 (p. 44, figs. 37–39); Giribet & Peñas 1997 (p. 82, figs. 88–93); Giannuzzi-Savelli et al. 2001 (p. 58, fig. 55); La Perna 2003 (p. 26, pl. 3, fig. 1); Repetto et al. 2005 (p. 285, mid left fig).

Yoldiella philippiana (Nyst, 1844) — Oliver et al. 2016 (online resource).

Diagnostic characters. Suboval shell; pointed posterior side; hinge line anteriorly convex and posteriorly concave; outer surface with growth lines only. Prodissoconch: shell type ST-1A; P-1: length about 170 µm; ellipsoidal outline; convex profile; surface with a net-like sculpture of radial anc concentric wrinkles; transition to the nepioconch well marked.

Remarks. The specific name philippiana Nyst is a replacement name for tenuis Philippi , a name preoccupied by Nucula tenuis Montagu, 1808 (now accepted as Ennucula ).

Occurrence. Box-corer samples BC04 (1 specimen), BC05 (2), BC67 (8), BC72 (6); cores BC04 (6), BC05 (15), BC21 (9), BC51 (6), BC67 (6), BC72 (6). Maximum length: 4 mm.

Distribution and habitat. The species ranges from Norway to NW Africa and the Mediterranean, reaching Israel coasts; it thrives on muddy bottoms in the upper bathyal zone, although it reachs also infralittoral depths in the northern Atlantic ( Poppe & Goto 1993; Pons-Moyà & Pons 1999; La Perna 2003; Galil 2004; Ceregato et al. 2007; Oliver et al. 2016). It was found living in the bathyal of Taranto, belonging to Abra-Nucula biocoenosis ( Di Geronimo & Panetta 1973). In Santa Maria di Leuca CWC biotope, it was found on the muddy bottoms around the coral colonies (Mastrototaro et al. 2010).

Fossil record. Pleistocene of Denmark and the Mediterranean (Di Geronimo & La Perna 1997; La Perna 2003; Petersen 2004). The species was originally described (as Nucula tenuis ) on fossil shells from Sicily.

Figures

FIGURE 3. a – c: Yoldiella nana (Sars M., 1865); RV (b, c) and LV (a), sample BC 72, scale bars: 0.5 mm (a – b), 0.1 mm (c, prodissoconch); d – f: Yoldiella philippiana (Nyst, 1844); RV, sample BC 72, scale bars: 1 mm (d – e), 0.1 mm (f, prodissoconch); g – i: Yoldiella striolata (Brugnone, 1876); RV, sample BC 72, scale bars: 1 mm (g – h), 0.1 mm (i, prodissoconch); j – m: Asperarca nodulosa (Müller, 1776); LV, sample BC 11, scale bars: 5 mm (j – k), 1 mm (l, juvenile), 0.1 mm (m, prodissoconch).