Schismatogobius hoesei, Keith & Lord & Larson, 2017

Keith, Philippe, Lord, Clara & Larson, Helen K., 2017, Review of Schismatogobius (Gobiidae) from Papua New Guinea to Samoa, with description of seven new species, Cybium 41 (1), pp. 45-66 : 60-62

publication ID	https://doi.org/ 10.26028/cybium/2017-411-005
persistent identifier	https://treatment.plazi.org/id/2F75C925-CE41-FB3B-FC7A-2C6A28A6CEB3
treatment provided by	Felipe
scientific name	Schismatogobius hoesei
status	sp. nov.

Treatment

Schismatogobius hoesei View in CoL , new species

( Figs 1-2D View Figure 1 View Figure 2 , 4 View Figure 4 , 9 View Figure 9 ; Tabs I-III)

Schismatogobius sp. – Allen, 1989: 209 (Plate 52).

Schismatogobius sp. – Allen et al., 2002: 273.

Schismatogobius insignum View in CoL – Hoese and Larson, 2006:

1682.

Material examined. – 64 specimens, all from Queensland, Australia, with a size range of 16-39.3 mm SL .

Holotype. – AMS I.21272-011, male (33.8 mm SL); South branch of Endeavour River, west of Cooktown, Queensland, Australia, 19 Sep. 1979, coll. Hoese.

Paratypes. – AMS I 21272-0012 , 4 males, 4 females (28.1-36.2 mm SL); same data as holotype . MNHN 2016- 0293 About MNHN , 1 male, 1 female (30.9-32.7 mm SL); same data as holotype . AMS I.22058-007, 1 male, 1 female, 2 juv. (16- 29.8 mm SL), Daintree River , 18 Sep. 1980, coll. Hoese & Larson. QM I.40661, 1 male (29.8 mm SL); Daintree River , 1 Jul. 1995, coll. Hales. QM I.29399, 1 male and 1 female (37.3-39.3 mm SL); Mulgrave River , 13 Jul. 1994, coll. Graham. NTM S.14191-003, 1 male and 1 female (29-29.8 mm SL); Daintree River , 1 Sep. 1993, coll. Pusey. NTM S.14188- 002, 1 male and 1 female (33-33.1 mm SL); Daintree River , 27 Aug. 1994, coll. Pusey. NTM S.16057-001, 1 male (34.3 mm SL); Daintree River , 8 Dec. 2004, coll. Kroon. WAM P.26968-001, 2 males and 1 female (26.5-29.5 mm SL); Daintree River , 18 Sep. 1980, coll. Hoese. WAM P.28545-009, 1 female (35.4 mm SL); Hilda Creek River , 24 Nov. 1985, coll. Allen and Stark. BLIP 19790085 , 1 male, 2 females (30.9-31.7 mm SL); same data as holotype .

Non types. – QM I.36404, 1 specimen, Johnstone River ,

Aug. 2002, coll. Hagedorn. QM I.31250, 1 spm, Annan River , 17 Jun. 1998, coll. McDougall. QM I.33215, 1 spm, trib. Barron River , Cairns , Aug. 1997, coll. McDougall. QM I.30766, 2 spms, Behana Creek , Nov. 1996, coll. Schmida. QM I.30474, 1 spm, 1 male, Daintree River , 1 Jul. 1995, coll. Hales. AMS I.22067-001, 1 spm, Mulgrave R., 6 km SW of Gordonvale on Goldsborough Rd. , 20 Sep. 1980, coll. Hoese. AMS I.21272-001, 23 spms, South branch of Endeavour River, west of Cooktown , 19 Sep. 1979, coll. Hoese. AMS I.22086-007, 2 spms, S of Innisfail on highway, Liverpool Creek , 4 Oct. 1980, coll. Hoese. AMS I.22711-001, 3 spms, Little Mulgrave River , near Gordonvale turnoff , 30 Sep. 1981, coll. Hoese.

Diagnosis

Usually 16 pectoral rays; pectoral fins banded with rows of dark spots. Membrane in first dorsal fin posterior to spine 6 connected to base of spine of second dorsal fin. Ventral surface of head in male entirely white to yellowish, with variably dark areas on chin and isthmus, or with a blackish lower border to preopercle, blackish lips and black mentum. Ventral surface of head in female white to yellowish with variably developed blackish area around mentum.

Description

A large Schismatogobius (average adult size> 30 mm SL). Body naked, slender, almost circular in cross-section. Head rounded, snout obtuse, cheeks may be bulbous in large males. Mouth oblique, tip of lower lip anteriormost. Jaw lengths in males much greater than in females, with jaws reaching back to rear half of eye in large females (40-47% of HL) and nearly to rear edge of preopercle in large males (up to 70% in HL). Eyes high on head, close together with interorbital width of 6.4-10.6% of HL. Anterior nostril in short tube.

Dorsal fins VI-I,9, membrane in first dorsal fin posterior to spine 6 connected to base of spine of second dorsal fin. D1 with all spines about equal in length; fifth spine usually long- est. Anal fin I,9, slightly behind or approximately below second dorsal fin origin. Caudal fin with 11-12 branched rays, posterior margin rounded. Pectoral fins rounded to slightly pointed, with 15(6)-16(30)-17(1) rays ( Tab. I), ventralmost ray unbranched. Pelvic fins always I,5, with both fins joined together their entire length between rays 5, forming strong cup-like disc; well-developed frenum with two distinctly pointed lobes between spines; fins not extending beyond anus. Morphomeristic data given in table III.

Tongue variably bilobed. Teeth in upper jaw (13-18) usually in two rows, teeth conical and slightly recurved. Teeth in lower jaw (9-12) usually in one or two rows of teeth anteriorly and single row laterally, all teeth conical with outer row teeth only slightly enlarged and somewhat recurved.

Cephalic sensory pore system always with pores B, D, F, K, L, N and O; pore D singular with all other pores paired; oculoscapular canal absent between pores F and K. Anterior interorbital extension of anterior oculoscapular canal with double terminal pores B slightly posterior to posterior nostril. D pore at rear of interorbital. Posterior extension of anterior oculoscapular canal terminating laterally on each side of head at pore F, just behind posterior edge of eye. Posterior oculoscapular canal with 2 terminal pores, K and L; preopercular canal with 2 pores, N and O. Cutaneous sensory papillae similar to pattern described by Akihito et al. (1988) for Schismatogobius roxasi .

Urogenital papilla broadly rounded in females and slightly triangular in males.

Colour in preservation ( Fig. 9 View Figure 9 )

Head and body pale brown with brown to blackish markings; basic pattern as in living fish, but duller; orange, blue and yellow being replaced by fawn to whitish pigment.

Colour in life

Based on photos of living fish by Keith Martin and Gunther Schmida. Head and body whitish to pinkish brown with three vertical dark brown to black bands crossing dorsum and short saddle across nape just before first dorsal fin (latter may be indistinct); first band below first dorsal fin, second below second dorsal fin and third band below rear of second dorsal fin; bands may have narrow blue edges and may be diffuse or broken-up into blotches; dark bands reach to mid-side of body where they become variable blotches and oblique blotchy lines. Dorsal half of body between bars with indistinct whitish to pale bluish rounded spots and speckles and network of thin brown to red-brown lines, forming variable vermiculate pattern. Underside of body pinkish white to whitish. Head dusky brown dorsally, cheeks and snout may be darker than rest of head, with small dark brown spots on cheek close to eye; may be indistinct dusky bar from eye crossing both lips. Lips brownish to greyish, and mouth lining bright orange in males. Iris mottled grey-gold. First dorsal fin transparent with median dusky stripe or row of dusky spots and thin blackish margin. Second dorsal fin transparent to faintly yellowish with 2-3 rows of small dark spots and dusky margin. Anal fin transparent to faintly dusky. Pectoral fins translucent to yellowish with 3-4 rows of dusky to dark brown spots, plain dusky brownish basally. Pelvic fins translucent to whitish. Caudal fin translucent to pale yellowish, with large brown to blackish blotch extending from base onto fin; blotch roughly diamond-shaped and may have darker edges extending out from margins forming large X; on either side of posteriormost point of diamond shape, two white oblong blotches or oval spots; 1-3 rows of small dark spots on remainder of fin.

Allen (1989) and Allen et al. (2002) illustrated this species alive and freshly dead; Schmida (2008: 81) illustrated a live specimen. Pusey et al. (2004) noted that the isthmus of mature males becomes orange along with the mouth and their pelvic fins become almost black with orange margin.