Coelorinchus robustus ( Robba, 1970 )

Lin, Chien-Hsiang, Brzobohatý, Rostislav, Nolf, Dirk & Girone, Angela, 2017, Tortonian teleost otoliths from northern Italy: taxonomic synthesis and stratigraphic significance, European Journal of Taxonomy 322, pp. 1-44 : 23

Coelorinchus robustus ( Robba, 1970)

The material of C. robustus known from the literature ( Robba 1970: pl. 10, figs 4–6, pl. 11, figs 1–2; Nolf & Steurbaut 1983: pl. 5, fig. 11; Brzobohatý 1995: pl. 2, figs 1–2; Lin et al. 2015: fig. 3(12)) as well as our material ( Fig. 8 L–M) all consist of huge adult otoliths. At a first glance, they resemble those of large Coelorinchus caelorhincus (Risso, 1810) (see Fig. 8A ) a lot, but, apart from the extraordinary size of the specimens, the cauda is much longer in C. robustus , the posterior tip of the otolith is slightly directed upwards, and the collicula are wider and closer to each other at the collum, sometimes they are even fused together dorsally. One of the otoliths of C. caelorhincus figured by Lin et al. (2015: fig. 3(12)) exhibits the aforementioned features, suggesting much closer similarities to C. robustus than C. caelorhincus .

Figures

Fig. 8. Tortonian fish otoliths from northern Italy. A. Coelorinchus caelorhincus (Risso, 1810), Montegibbio (IRSNB P 9772). B. Coryphaenoides contortus (Bassoli, 1906), Sant’Alosio (IRSNB P 9773). C–D. “Merluccius” rattazzii sp. nov., Sant’Alosio (IRSNB P 9686 (holotype)–P 9687). E–F. Coryphaenoides biobtusus sp. nov., Alba, Tanaro (5 m) (IRSNB P 9684 (holotype)–P 9685). G–H. Nezumia aff. sclerorhynchus (Valenciennes, 1838), Alba, Tanaro (5 m) (IRSNB P 9774–P 9775). I–J. Moridae indet., Sant’Agata Fossili (IRSNB P 9776–P 9777). K. Nezumia ornata (Bassoli, 1906), Montegibbio (IRSNB P 9778). L–M. Coelorinchus robustus (Robba, 1970); L. Stazzano, M. Sant’Alosio (IRSNB P 9779–P 9780). N. Gadiculus labiatus (Schubert, 1905), Torrente Stirone (IRSNB P 9781). O–P. Melanonus paralyconus Schwarzhans, 1986, Mondovi, Madonna della Neve (IRSNB P 9782– P 9783). Q–R. Melanonus triangulus (Robba, 1970), Costa Vescovato (IRSNB P 9784–P 9785). S. Gadiculus argenteus Guichenot, 1850, Torrente Stirone (IRSNB P 9786). 1 = ventral view; 2 = inner view. Scale bars = 1 mm.