Rhodeus amarus ( Bloch, 1782 )

Schulz-Mirbach, Tanja & Reichenbacher, Bettina, 2006, Reconstruction of Oligocene and Neogene freshwater fish faunas-an actualistic study on cypriniform otoliths, Acta Palaeontologica Polonica 51 (2), pp. 283-304 : 294

Rhodeus amarus ( Bloch, 1782)

Fig. 17 .

Material and dimensions.—See Table 2.

Description.—The general shape is trapezoid in the posterior portion and more elongated and rounded in the anterior portion. All edges are regularly and well developed, except the posteromedial edge, which is variable and also may be absent (e.g., Fig. 17A 1 ). The medial, lateral, and posterior margins are more or less straight.

Figures

Fig. 17. Utricular otoliths (lapilli) of Recent Rhodeus amarus (Bloch, 1782) from wild catches in Germany. A. BSPG 2003 IV 99, in dorsal view, represented as right lapillus, mirrored (A1) and in anterior view, represented as left lapillus (A2). B, D, E. BSPG 2003 IV 98a, 100, and 97 respectively, in dorsal views, represented as right lapilli (E mirrored). C. BSPG 2003 IV 98b in ventral view, represented as left lapillus. B, C display a lapilli pair. SEM−pictures (A–C), digital photographs (D, E).

Fig. 1. Position and morphology of the otoliths in the head of a carp. A. Computer tomography (CT) of Recent Cyprinus carpio (Linnaeus, 1758) (BSPG 2003 IV 143) and its lapilli; 150 layers of frontal sections were carried out from the dorsal to the ventral side of the head. 3D reconstruction of the head with the position of the otoliths projected (A1), frontal section (layer 36), showing the position of lapillus and asteriscus (A2), and frontal section (layer 38), showing the position of sagitta and asteriscus (A3); right (A4) and left (A5) lapillus in dorsal views (A4 and A5 are digital photographs). B. Digital pictures of the otoliths of Recent Cyprinus carpio (Linnaeus, 1758): lapillus in dorsal view (B1), asteriscus in medial view (B2), and sagitta in medial view (B3) (posterior tip incomplete). Otoliths are represented as right ones (BSPG 2003 IV 156b, d, and e respectively).