Schismatogobius bussoni, Keith & Lord & Darhuddin & Limmon & Sukmono & Hadiaty & Hubert, 2017

Keith, Philippe, Lord, Clara, DarHuddin, Hadi, Limmon, Gino, Sukmono, Tedjo, Hadiaty, Renny K. & Hubert, Nicolas, 2017, Schismatogobius (Gobiidae) from Indonesia, with description of four new species, Cybium 41 (2), pp. 195-211 : 203

Schismatogobius bussoni , n. sp. Keith, Hubert, Limmon & Darhuddin

( Figs 1-2 ; 4-5 ; Tabs I-III)

Material examined. – Eleven specimens from Moluccas with a size range of 16-24.3 mm SL .

Holotype. – MZB 23798, male (22 mm SL); Ambon, Wai Kalauli , Moluccas, 3 Apr. 2016, coll. Hubert, Keith, Busson, Darhuddin et al.; BIF 5547.

Paratypes. – MZB 23799, 1 male, 4 females (17.4- 24.3 mm SL); Ceram Tengah , Wai Tuni, Moluccas, 29 Mar. 2016, coll. Hubert et al.; BIF 5349 to 5353. MNHN 2016- 0305, 1 female, 4 males (16-24.2 mm SL); Ceram Tengah, Wai Tuni, Moluccas, 29 Mar. 2016, coll. Hubert et al.; tags 12162, 12167, 12168, 12169, 12173 .

Diagnosis

Usually 15 pectoral rays; pectoral fins with a large oval transverse dorsal black band. First dorsal fin membrane posterior to spine 6 not connected to base of spine of second dorsal fin. Ventral surface of head in male, and sometimes frenum, blackish. Ventral surface of head in female whitish, slightly pigmented with dark dots around the mouth and usually with a blackish ring around mentum. A single mitochondrial lineage (BOLD:ADF3589).

Description

A small sized Schismatogobius (average adult size <25 mm SL). Body naked, slender, almost circular in cross-section. Head rounded, snout rather pointed. Mouth oblique, lower lip more prominent. Jaw lengths in male much greater than in female; jaw length 47.6-57.6% of HL in males and 31.7-39.7% of HL in females. Lower jaw reaching vertical brown. Belly whitish to greyish. First dorsal fin with large horizontal black band. Second dorsal fin with rows of black spots on rays. Caudal fin mainly black with two median white spots dorsally and ventrally. Pectoral fin translucent with a large black spot at the base dorsally. Caudal and pectoral fins translucent. Inside of mouth bright orange. Female: usually four vertical black bands in dorsal view; first band below first dorsal fin, second and third bands below second dorsal fin and fourth band at hypural crease, so the two middle bands are very close to each other. Colour of body between each band mottled and brownish-red. Nape orange. Cheeks and snout marbled with black and dusky markings. Belly greyish to yellow. Caudal fin mainly black with two median white spots dorsally and ventrally. Pectoral fins translucent with a large black spot at the base dorsally. Caudal and pectoral fins translucent. Inside of mouth grey.

Figures

Figure 1. – A: Most likely ML tree inferred using the TrN+I model (-lnL = 2888.77, I = 0.655, f(A) = 0.23025, f(C) = 0.31193, f(G) = 0.17856, f(T) = 0.2926, AC =AT = CG = GT = 1.0; AG = 13.12; CT = 6.72). BP are given above each branches. B: Distribution of TrN+I genetic distance within and among species.

Figure 2. – Schematic drawings of the ventral surface of head of Schismatogobius species from Indonesia. A: 14-15 pectoral rays; B: 15-16 pectoral rays; C: 16-17 pectoral rays.

Figure 4. – Distribution area of Schismatogobius species from Indonesia.

Figure 5. – A: Schismatogobius bus- soni n. sp., male, paratype in MZB 23799, BIF 5353 (Photo N. Hubert). B: Schismatogobius bussoni n. sp., female, paratype in MZB 23799, BIF 5349 (Photo N. Hubert).