Montacuta substriata Montagu 1808

• Main Authors: Negri, Mauro Pietro, Corselli, Cesare
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2016
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Bivalvia; Veneroida; Montacutidae; Montacuta; Montacuta substriata; Iceland
• Online Access: https://doi.org/10.5281/zenodo.6082189; http://treatment.plazi.org/id/03C587A5FFE0F951FF3BFD51636CF9C1

Montacuta substriata (Montagu, 1808) Fig. 8 a–c Ligula substriata Montagu, 1808 (p. 25). Montacuta substriata Montagu—Jeffreys 1881 (p. 698); Hidalgo 1917 (p. 450). Montacuta substriata (Montagu) — Deroux 1961 (p. 107, fig. 4 M. s.); Tebble 1966 (p. 89, text-figs. 42a–c). Montacuta substriata (Montagu, 1809) — Nordsieck 1969 (p. 93, pl. 14, fig. 52.40). Montacuta substriata (Montagu, 1808) — Poppe & Goto 1993 (p. 87, pl. 14, fig. 13); Repetto et al. 2005 (p. 315, mid right fig.); Oliver et al . 2016 (online resource). Diagnostic characters . Oval outline; very long anterior side; hinge of the right valve with an obliquely elongate anterior cardinal tooth; 9–10 weak radial ridges in the middle of the shell. Prodissoconch: shell type ST-2A; length about 210 µm (P-1 about 120 µm); slightly oval outline, somewhat more elongated in posteroventral direction; convex profile; P-1 roughly D-shaped, flattened, elevated with respect to P-2; P-1 surface weakly striated around the cicatrix; P-2 with dense fine commarginal growth welts; transition to the nepioconch well marked (no lip). Remarks . The elevated P-1 appears to be rather unusual, as well as the dense growth markings on P-2; consequently, the P-1/P-2 transition could also be interpreted as prodissoconch/nepioconch transition. We consider the concentrically sculptured shell as P-2 because of the clear demarcation with the adult shell and the completely different scupltural features of this latter. Occurrence . Box-corer sample BC72 (1 specimen). Length: 2 mm. Distribution and habitat . Montacuta substriata is distributed from Iceland to the Mediterranean, at infralittoral depths and down to about 600 m, being a commensal organism living attached to the anal spines of the heart urchins Spatangus purpureus and Echinocardium flavescens (Nordsieck 1969; Poppe & Goto 1993; Oliver et al. 2016). Fossil record. Plio-Pleistocene of Norway and Italy (Monterosato 1872; Monegatti & Raffi 2001). Published as part of Negri, Mauro Pietro & Corselli, Cesare, ...