Two new species of Pseudogobio pike gudgeon (Cypriniformes: Cyprinidae: Gobioninae) from Japan, and redescription of P. esocinus (Temminck and Schlegel 1846)
Tominaga, K. (Kyoto University, Kyoto (Japan). Graduate School of Science, Division of Biological Sciences) | Kawase, S.
Two new species of pike gudgeon, Pseudogobio agathonectris from western Honshu, Japan, and P. polysticta from eastern Honshu, Japan, are described, and P. esocinus (Temminck and Schlegel 1846) is redescribed. The two new species were previously considered to be P. esocinus, which had been only a nominal species of the genus from Japan. The two species are distinguishable from P. esocinus by following a combination of characters: tip of pectoral spiny soft ray not reaching that of 6th soft fin ray, and tip of outer edge of pectoral fin strongly curved posteriorly; long barbel (15.3-36.9% of HL in P. agathonectris, 16.9-34.8% in P. polysticta, respectively), with the tip commonly extending beyond vertical through anterior edge of eye; 10-14 (modally 13) and 12-14 (13) pectoral soft fin rays; long mouth (33.2-45.3% of HL and 29.6-42.0%); short length between anus and anal fin origin (16.5-21.4% of SL and 15.9-22.4%), with 11-14 (12) and 11-16 (12) scales; and small body size (at most 150 mm SL). Pseudogobio agathonectris is distinguishable from P. polysticta by the canonical discriminant functions based on five meristic and 25 morphometric characters, and distinct dark blotches and obscure black spots on dorsal and lateral body (vs. obscure blotches and many distinct spots).
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