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Fig. 1. A in Romanogobio persus

Fig. 1. A neighbor-joining tree for species of Ptychognathus from Taiwan, the Philippines and Indonesia, based on the cytochrome c oxidase subunit I (COI) gene. Probability values at the nodes represent support values. Only values> 50% are shown. For haplotype names, see table 1.

Fig. 4 in Romanogobio persus

Fig. 4. Ptychognathus stimpsoni sp. nov., holotype (male, CW 7.9 mm; NCHUZOOL 16501). A, carapace; B, left infraorbital ridge; C, left third maxilliped; D, left carpus of cheliped (dorsal view); E, outer view of left cheliped; F, pleon; G, left third ambulatory leg; H, left forth ambulatory leg; I–N, right G1; I, J, dorsal view; K, L, lateral view; M, N, ventral view).

Fig. 3 in Romanogobio persus

Fig. 3. Ptychognathus makii sp. nov., holotype (male, CW 23.5 mm; NCHUZOOL 16062). A, carapace; B, left third maxilliped; C, left carpus of cheliped (dorsal view); D, outer view of left cheliped; E, pleon; F, left third ambulatory leg; G, left forth ambulatory leg; H–I, right G1; H, I, dorsal view; J, K, lateral view.

Fig. 2. A–B in Romanogobio persus

Fig. 2. A–B: Ptychognathus makii sp. nov., holotype (male, CW 23.5 mm; NCHUZOOL 16062). C–F: Ptychognathus stimpsoni sp. nov.; C, D: holotype (male, CW 7.9 mm; NCHUZOOL 16501). E, F: paratype (male, CW 10.9 mm; NCHUZOOL 16502).

FIGURE 7 in Romanogobio skywalkeri, a new gudgeon (Teleostei: Gobionidae) from the upper Mur River, Austria

FIGURE 7. From the top. Romanogobio elimeius, not preserved, about 90 mm SL; Greece: Aliakmon north of Neapoli; R. uranoscopus, about 90 mm SL; Romania: Nera at Sasca Montana.

FIGURE 6 in Romanogobio skywalkeri, a new gudgeon (Teleostei: Gobionidae) from the upper Mur River, Austria

FIGURE 6. From the top. Romanogobio banarescui, not preserved, about 80 mm SL; Greece: Axios at Axioupoli; R. carpathorossicus, about 100 mm SL; Romania: Sapanta downstream of Sapanta; R. kesslerii, about 80 mm SL; Romania: Ialomita near Branesti;

FIGURE 3 in Romanogobio skywalkeri, a new gudgeon (Teleostei: Gobionidae) from the upper Mur River, Austria

FIGURE 3. Romanogobio skywalkeri, from the top, not preserved, 109 mm SL; FSJF 3688, 91 mm SL, 96 mm SL; Austria: River Mur at Oberaich.

FIGURE 2. Romanogobio skywalkeri, NMW 99058 in Romanogobio skywalkeri, a new gudgeon (Teleostei: Gobionidae) from the upper Mur River, Austria

FIGURE 2. Romanogobio skywalkeri, NMW 99058, holotype, 65 mm SL; Austria: River Mur at Bruck a.d. Mur. (photographs by Maria Bräuner)

FIGURE 1 in Romanogobio skywalkeri, a new gudgeon (Teleostei: Gobionidae) from the upper Mur River, Austria

FIGURE 1. Phylogenetic relationships among European Romanogobio species based on 553 bp of the COI gene. Shown is the ML tree; identical interspecific relationships were recovered in the BI tree (not shown). As measures of nodal support bootstrap replicates (BS, ML) and posterior probabilities (PP, BI) are shown above the branches (BS and PPs> 50 and 0.70, respectively, are shown)

Figure 4 from: Jelić D, Jelić M, Žutinić P, Šimunović I, Zupančič P, Naseka AM (2018) Distribution of endangered Italian gudgeon Romanogobio benacensis (Cypriniformes, Cyprinidae, Gobioninae) with remarks on distinguishing morphological characters. ZooKeys 729: 103-127. https://doi.org/10.3897/zookeys.729.20615

Figure 4 Lateral view of the head of Romanogobio benacensis (a) and Gobio obtusirostris (b); the 1st and 2nd infraorbital bones are shaded. Scale bar 1 cm.

Figure 2 from: Jelić D, Jelić M, Žutinić P, Šimunović I, Zupančič P, Naseka AM (2018) Distribution of endangered Italian gudgeon Romanogobio benacensis (Cypriniformes, Cyprinidae, Gobioninae) with remarks on distinguishing morphological characters. ZooKeys 729: 103-127. https://doi.org/10.3897/zookeys.729.20615

Figure 2 Lateral view of Romanogobio benacensis from the Mirna River (HDBI 1323), 62.3 mm SL (a) and the Po drainage (NMW 84845), 50.9 mm SL (b); Gobio obtusirostris, the Reka River (PZC), 98.3 mm SL (c) and the Sava River (NMW 87485), 88.4 mm SL (d); and Gobio gobio, the Elbe River (NMW 92127), 72.4 mm SL (e). Scale bar 1 cm.

Figure 3 from: Jelić D, Jelić M, Žutinić P, Šimunović I, Zupančič P, Naseka AM (2018) Distribution of endangered Italian gudgeon Romanogobio benacensis (Cypriniformes, Cyprinidae, Gobioninae) with remarks on distinguishing morphological characters. ZooKeys 729: 103-127. https://doi.org/10.3897/zookeys.729.20615

Figure 3 Radiographs of unbranched dorsal-fin rays. Specimens as a–d in Fig. 2. Arrow shows presence (a–b) or absence (c–d) of smallest anteriormost unbranched ray.

Figure 5 from: Jelić D, Jelić M, Žutinić P, Šimunović I, Zupančič P, Naseka AM (2018) Distribution of endangered Italian gudgeon Romanogobio benacensis (Cypriniformes, Cyprinidae, Gobioninae) with remarks on distinguishing morphological characters. ZooKeys 729: 103-127. https://doi.org/10.3897/zookeys.729.20615

Figure 5 Result of DFA performed on 15 (8 meristic and 7 morphometric) distinguishing characters to classify Reka and Mirna samples.

Figure 7 from: Jelić D, Jelić M, Žutinić P, Šimunović I, Zupančič P, Naseka AM (2018) Distribution of endangered Italian gudgeon Romanogobio benacensis (Cypriniformes, Cyprinidae, Gobioninae) with remarks on distinguishing morphological characters. ZooKeys 729: 103-127. https://doi.org/10.3897/zookeys.729.20615

Figure 7 Phylogenetic tree inferred by ML analysis using cytb sequences of Romanogobio and Gobio. Newly obtained haplotypes in this study were marked by black rhombi. Node supports are given as bootstrap values (P) in ML and MP analyses (showing values ≥ 70) and posterior probabilities (pp) in IB (showing values ≥ 0.9).

FIGURE 5 in Romanogobio skywalkeri, a new gudgeon (Teleostei: Gobionidae) from the upper Mur River, Austria

FIGURE 5. Mur River, Austria, habitat of R. skywalkeri.

FIGURE 4 in Romanogobio skywalkeri, a new gudgeon (Teleostei: Gobionidae) from the upper Mur River, Austria

FIGURE 4. Distribution of R. skywalkeri, Mur River, Austria

Figure 4 from: Bogutskaya NG, Stefanov T, Naseka AM, Diripasko OA (2019) A recent record of Romanogobio antipai (Actinopterygii, Cyprinidae, Gobioninae) from the Danube River in Bulgaria. ZooKeys 825: 105-122. https://doi.org/10.3897/zookeys.825.32434

Figure 4 - CA (SPSS, k-means) for three groups of samples ( R. antipai , R. kesslerii and R. vladykovi ). No 1 refers to NMNHS specimen identified as Romanogobio antipai .

Figure 2 from: Bogutskaya NG, Stefanov T, Naseka AM, Diripasko OA (2019) A recent record of Romanogobio antipai (Actinopterygii, Cyprinidae, Gobioninae) from the Danube River in Bulgaria. ZooKeys 825: 105-122. https://doi.org/10.3897/zookeys.825.32434

Figure 2 - Dorsal view of the head of Romanogobio antipai , NMNHS specimen 68.7 mm SL, Danube at Vetren (a) MGAB/BN759, SL 47.7 mm, Sulina (b) ANSP syntype 47.8 mm SL, Sulina (c) and R. kesslerii NMNHS, 65.7 mm SL, Tsibritsa River (d).

Figure 1 from: Bogutskaya NG, Stefanov T, Naseka AM, Diripasko OA (2019) A recent record of Romanogobio antipai (Actinopterygii, Cyprinidae, Gobioninae) from the Danube River in Bulgaria. ZooKeys 825: 105-122. https://doi.org/10.3897/zookeys.825.32434

Figure 1 - Lateral view of Romanogobio antipai NMNHS specimen 68.7 mm SL, Danube at Vetren (a) MGAB/BN760 specimen 64.9 mm SL, lower Argeş R. (b) ANSP syntype 47.8 mm SL, Sulina (c) and R. kesslerii NMNHS, 65.7 mm SL, Tsibritsa River (d).

Figure 3 from: Bogutskaya NG, Stefanov T, Naseka AM, Diripasko OA (2019) A recent record of Romanogobio antipai (Actinopterygii, Cyprinidae, Gobioninae) from the Danube River in Bulgaria. ZooKeys 825: 105-122. https://doi.org/10.3897/zookeys.825.32434

Figure 3 - DFA (Euclidean distance, complete linkage clustering algorithm), distribution of discriminant scores along two canonical discriminant functions established to discriminate between three groups of samples ( R. antipai , R. kesslerii and R. vladykovi ). Solid circle corresponds to NMNHS specimen identified as Romanogobio antipai .