Rhinogobius flumineus (Mizuno 1960)

Ito, Taiki, Suzawa, Yuzuru & Sato, Yoichi, 2024, Notes on type specimens of Rhinogobius flumineus (Mizuno 1960) (Perciformes: Gobiidae) and Cobitis takatsuensis Mizuno 1970 (Cypriniformes: Cobitidae) in Tokushima Prefectural Museum, Tokushima, Japan, Zootaxa 5446 (4), pp. 564-572 : 567

Rhinogobius flumineus (Mizuno 1960)

( Figs. 4 – 7 )

Holotype: TKPM-P 3000 , female, 37.0 mm SL, Sojya-gawa River , Oshita, Ochi District, Ehime, Japan, 31 August 1959, N. Mizuno.

Paratypes: All paratypes collected with holotype. TKPM-P 3001 , female, 34.2 mm SL ; TKPM-P 3002 , male, 33.5 mm SL ; TKPM-P 3003 , male, 32.3 mm SL ; TKPM-P 3004 , male, 38.2 mm SL ; TKPM-P 3005 , female, 34.3 mm SL .

Remarks. Mizuno (1960b) noted that while he had preserved the type specimens of the species in “my collection,” each type specimen had not been individually assigned a number. After TKPM received these type specimens, TKPM-P registration numbers were assigned to the holotype and five paratypes.

Specimen jars containing the holotype and paratypes were labeled with their type status, localities, and collection dates. The collection date indicated on these jar labels was 31 August 1959, whereas Mizuno (1960b) erroneously described the collection date of the holotype and paratypes as 30 August 1959.

In Mizuno (1960b), neither the vertebral count nor details of the cephalic sensory system of each of the type specimens of R. flumineus were provided. Herein, in Fig. 6 , we present an illustration of the cephalic sensory system of the holotype, as well as the vertebral counts (abdominal + caudal) of the holotype and five paratypes as follows: TKPM-P 3000 : 11+17, TKPM-P 3001 : 11+16, TKPM-P 3002 : 11+17, TKPM-P 3003 : 11+17, TKPM-P 3004 : 11+17, TKPM-P 3005 : 11+17.

Figures

FIGURE 4. Holotype of Rhinogobius flumineus (Mizuno 1960), TKPM-P 3000, 37.0 mm SL. Lateral (upper) and dorsal (lower) views.

FIGURE 5. Paratypes of Rhinogobius flumineus (Mizuno 1960). (A) TKPM-P 3001, 34.2 mm SL. (B) TKPM-P 3002, 33.5 mm SL. (C) TKPM-P 3003, 32.3 mm SL. (D) TKPM-P 3004, 38.2 mm SL. (E) TKPM-P 3005, 34.3 mm SL.

FIGURE 6. Cephalic sensory system of Rhinogobius flumineus (Mizuno 1960), TKPM-P 3000, holotype, 37.0 mm SL. Dorsal (upper), lateral (middle), and ventral (lower) views. Sensory canal pores [B’, C, D (S), E, F’, H’, K’, L’, M’, N, and O’] and sensory papillae (small dots) are shown. AN, anterior nasal pore; PN, posterior nasal pore. Scale bar represents 1 mm.

FIGURE 7. Soft X-ray negatives of holotype and five paratypes of Rhinogobius flumineus (Mizuno 1960). (A) TKPM-P 3000, holotype, 37.0 mm SL. (B) TKPM-P 3001, paratype, 34.2 mm SL. (C) TKPM-P 3002, paratype, 33.5 mm SL. (D) TKPM-P 3003, paratype, 32.3 mm SL. (E) TKPM-P 3004, paratype, 38.2 mm SL. (F) TKPM-P 3005, paratype, 34.3 mm SL.