Cylichna collyra Melvill, 1906

Albano, Paolo G., Steger, Jan, Bakker, Piet A. J., Bogi, Cesare, Bosnjak, Marija, Guy-Haim, Tamar, Huseyinoglu, Mehmet Fatih, LaFollette, Patrick I., Lubinevsky, Hadas, Mulas, Martina, Stockinger, Martina, Azzarone, Michele & Sabelli, Bruno, 2021, Numerous new records of tropical non-indigenous species in the Eastern Mediterranean highlight the challenges of their recognition and identification, ZooKeys 1010, pp. 1-95 : 1

Cylichna collyra Melvill, 1906 Figure 30

New records.

Israel • 1 spcm; Palmachim; 31.9477°N, 34.6562°E; depth 37.5 m; 18 Oct. 2017; soft substrate; box-corer; Shafdan project (sample 22(A)); size: H 4.2 mm, W 1.5 mm (illustrated specimen) • 1 spcm; Palmachim; 31.9424°N, 34.6551°E; depth 36.3 m; 2 May 2018; soft substrate; box-corer; Shafdan project (sample 21(A)); size: H 7.2 mm, W 4.0 mm • 2 spcms; Palmachim; 31.9376°N, 34.6515°E; depth 36.7 m; 2 May 2018; soft substrate; box-corer; Shafdan project (sample 5(B)) • 1 spcm; Palmachim; 31.9685°N, 34.6732°E; depth 35.6 m; 2 May 2018; soft substrate; box-corer; Shafdan project (sample 26(A)) • 1 spcm; Palmachim; 31.9477°N, 34.6562°E; depth 37.5 m; 2 May 2018; soft substrate; box-corer; Shafdan project (sample 22(B)) • 3 spcms; Palmachim; 31.9424°N, 34.6551°E; depth 36.3 m; 2 May 2018; soft substrate; box-corer; Shafdan project (sample 21(C)) • 2 spcms; Palmachim; 31.9327°N, 34.6495°E; depth 36.2 m; 2 May 2018; soft substrate; box-corer; Shafdan project (sample 4(A)) • 1 spcm; Palmachim; 31.9574°N, 34.6645°E; depth 36.2 m; 2 May 2018; soft substrate; box-corer; Shafdan project (sample 24(C)) • 1 spcm; Palmachim; 31.9477°N, 34.6562°E; depth 37.5 m; 20 Oct. 2018; soft substrate; box-corer; Shafdan project (sample 22(A)).

Additional material examined.

Oman • 13 shs; off Muscat; 24°58'N, 56°54'E; 156 fathoms (285 m) depth; NMW.1955.158.00578 (F.W. Townsend coll.).

Remarks.

We record here for the first time in the Mediterranean 13 living individuals of Cylichna collyra , a cephalaspidean originally described from the Gulf of Oman ( Melvill 1906b). Cylichna collyra can be distinguished from the native Mediterranean C. cylindracea (Pennant, 1777) by its more elongated and slender shell, the more tapering apical part, the color pattern characterized by fine brown spiral lines apically and abapically, and the smaller size ( C. cylindracea commonly reaches 1 cm in height whereas C. collyra attains approximately half that size). Cylichna villersii (Audouin, 1826), another non-indigenous species of Red Sea origin recorded from the Mediterranean coast of Israel ( Bogi and Galil 2013a), is smaller (less than 2 mm), less slender, has a more rounded base and stronger growth marks (not visible in C. collyra ), and bears two brown bands apically and abapically instead of the fine brown lines. Cylichna biplicata (A. Adams in Sowerby, 1850), a species occurring on the continental platform in the Indo-West Pacific, shares with our specimens the cylindrical shape and the color pattern of reddish-brown spiral bands apically and abapically ( Valdés 2008), but is larger, more elongated anteriorly, with a stronger columellar tooth, and the colored spiral bands become a compact larger band apically. Cylichna collyra has not been recorded from the Red Sea yet ( Dekker and Orlin 2000).

Figures

Figure 30. Cylichna collyra Melvill, 1906, Palmachim, Israel, Shafdan project (sample 22 (A )): front (A, B), side (C) and back (D) views, and apical (E) and anterior (F) microsculpture. Scale bars: 1 mm (A-D); 0.2 mm (E, F).