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FIGURE 2 in Eudontomyzon graecus, a new nonparasitic lamprey species from Greece (Petromyzontiformes: Petromyzontidae)

FIGURE 2. Oral disc of Eudontomyzon graecus, sp. n. A: holotype (immature male; CMNFI 1986–0741; disc length, 6.5 mm; TL, 136.5 mm); B: a paratype (immature female; CMNFI 1986–0720; disc length, 7.5 mm; TL, 141 mm). The photo of the paratype is from fig. 12e in Renaud (1982).

FIGURE 3 in Eudontomyzon graecus, a new nonparasitic lamprey species from Greece (Petromyzontiformes: Petromyzontidae)

FIGURE 3. Tail length residuals of 26 adults of Eudontomyzon graecus sp. n. (․) and 40 adults of E. hellenicus (˔) against their total length. The open symbols represent the respective holotypes. The horizontal line in the graph is the line of maximum separation (88%). Two pairs of E. graecus individuals lying above this line had identical coordinates; therefore, only 24 of 26 symbols are visible for this species.

FIGURE 1 in Eudontomyzon graecus, a new nonparasitic lamprey species from Greece (Petromyzontiformes: Petromyzontidae)

FIGURE 1. Lateral view of the holotype (immature male; CMNFI 1986–0741; TL, 136.5 mm) of Eudontomyzon graecus, sp. n.

FIGURE 4. A in Eudontomyzon graecus, a new nonparasitic lamprey species from Greece (Petromyzontiformes: Petromyzontidae)

FIGURE 4. A: Trunk length residuals of 18 ammocoetes of Eudontomyzon graecus sp. n. (․) and 219 ammocoetes of E. hellenicus (˔) against their total length. The horizontal line in the graph is the line of maximum separation (97%). One pair of E. graecus lying below this line had identical coordinates; therefore, only 25 of 26 symbols are visible for this species. Twenty pairs and two sets of three E. hellenicus individuals lying above this line had identical coordinates; therefore, only 195 symbols are visible for this species. B: Tail length residuals of 18 ammocoetes of Eudontomyzon graecus sp. n. (․) and 219 ammocoetes of E. hellenicus (˔) against their total length. The horizontal line in the graph is the line of maximum separation (97%). One E. graecus and one E. hellenicus individual lying above this line had identical coordinates and the symbol for E. graecus is the one that appears; therefore, all 18 individuals of E. graecus are visible on the graph. Twenty-four pairs and four sets of three E. hellenicus individuals lying below this line had identical coordinates; therefore, taking into account the individual with identical coordinates to the E. graecus mentioned above, only 186 symbols are visible for E. hellenicus.

FIGURE 7 in Lethenteron ninae, a new nonparasitic lamprey species from the north-eastern Black Sea basin (Petromyzontiformes: Petromyzontidae)

FIGURE 7. Tongue precursor in ammocoete. a, Lethenteron ninae (paratype); b, Eudontomyzon mariae (ZISP 29159). 1, bulb; 2, cirri.

FIGURE 6 in Lethenteron ninae, a new nonparasitic lamprey species from the north-eastern Black Sea basin (Petromyzontiformes: Petromyzontidae)

FIGURE 6. Lethenteron ninae, holotype (photo made from live specimen, ZISP 54431, TL (measured after preservation) 163.8 mm, Shakhe River).

FIGURE 3. Oral disc. a in Lethenteron ninae, a new nonparasitic lamprey species from the north-eastern Black Sea basin (Petromyzontiformes: Petromyzontidae)

FIGURE 3. Oral disc. a, Lethenteron ninae, holotype (photo made from live specimen, ZISP 54431, TL (after preservation) 163.8 mm, Shakhe River); b, Eudontomyzon mariae (from Berg 1931: Pl. 4, FIGURE 2, syntype, TL 192 mm). 1, supraoral lamina; 2, infraoral lamina; 3, posterial teeth (one incomplete row in L. ninae and three rows in E. mariae); 4, anterior endolateral bicuspid tooth; 5, row of marginal teeth; 6, fimbriae; 7, ventral pigmented neuromast; 8, exolateral teeth; 9, transverse lingual lamina.

FIGURE 4. Transverse lingual lamina. a in Lethenteron ninae, a new nonparasitic lamprey species from the north-eastern Black Sea basin (Petromyzontiformes: Petromyzontidae)

FIGURE 4. Transverse lingual lamina. a, Lethenteron ninae, paratype (formula 6u-I-5u); b, Eudontomyzon mariae, syntype (formula 1u-I-2u). Scale bar: 1 mm. Arrows show the differences.

FIGURE 5 in Eudontomyzon graecus, a new nonparasitic lamprey species from Greece (Petromyzontiformes: Petromyzontidae)

FIGURE 5. Geographic distribution of Eudontomyzon graecus sp. n. (․) and E. hellenicus (●).

FIGURE 5 in Lethenteron ninae, a new nonparasitic lamprey species from the north-eastern Black Sea basin (Petromyzontiformes: Petromyzontidae)

FIGURE 5. Lethenteron ninae, paratype (ZISP 54435, TL 162.5 mm, Mokva River).

FIGURE 1 a-c in Lethenteron ninae, a new nonparasitic lamprey species from the north-eastern Black Sea basin (Petromyzontiformes: Petromyzontidae)

FIGURE 1 a-c. Measurement landmarks of a lamprey adult. For explanations see Table 1.

FIGURE 2 in Lethenteron ninae, a new nonparasitic lamprey species from the north-eastern Black Sea basin (Petromyzontiformes: Petromyzontidae)

FIGURE 2. Ammocoete of Lethenteron ninae, paratype (ZISP 54436, TL 126.9 mm, Mzymta River).

FIGURE 10 in Lethenteron ninae, a new nonparasitic lamprey species from the north-eastern Black Sea basin (Petromyzontiformes: Petromyzontidae)

FIGURE 10. Mzymta River (in the late autumn), a typical habitat of Lethenteron ninae.