ANCISTROGOBIUS DIPUS - (SHIBUKAWA, YOSHINO & ALLEN, 2010)
Picture courtesy of: Alain Daoulas
Actinopterygii (Gigaclass) > Actinopteri (Class) > Teleostei (Subclass) > Gobiiformes (Order) > Gobioidei (Suborder) > Gobiidae (Family) > Gobiinae (Subfamily) > Ancistrogobius (Genus)
Doublefoot goby, Double-fin cheek-hook goby, Largetooth goby, Futahire ho’okagi-haze, フタヒレホオカギハゼ,
Description
Dorsal spines (total): 7; Dorsal soft rays (total): 9-10 (usually: 10) ; Anal spines: 1; Anal soft rays: 9; Pectoral fin rays: 19-21 (usually: 20); Pelvic fin rays: I, 5; Segmented caudal fin rays: 9+8, including: 6+6 branched rays; Dorsal unsegmented caudal-fin rays: 7-9; Ventral unsegmented caudal-fin rays: 5-8; Longitudinal scales: 24-26; Transverse scales from anal-fin origin upward and forward to dorsal-fin base: 8-10; Transverse scales from anal-fin origin upward and backward to dorsal fin base: 7-9; Transverse scales from second dorsal fin base downward and backward to anal-fin base: 7-8; Circumpeduncular scales: 12; Gill rakers: 1+9 or 2+8 or 2+9; Pseudobranchial filaments: 8-9. Largely separated pelvic fin with rudimentary connecting membrane and no frenum; Fifth segmented ray of pelvic fin short, its length: 67.9–71.9 % of preceding ray; Head and most of nape naked and no predorsal scales (except for a single specimen, with one predorsal scale); Third spine of first dorsal fin greatly elongated, filamentous, obviously longer than preceding spine. Max. length: 4.2 cm SL. Depth range: 15 - 35 m.
Color
Ground color of head and body pale brown or pale gray dorsally, becoming paler ventrally; Cheek with at least some dark brown spots smaller than pupil (sometimestinged with yellow), those at corner of mouth typically largest and most conspicuous; In addition, several faint yellowish small spots sometimes present on cheek; Dorsal part of operculum with several faint dusky spots, sometimes tinged with yellow; Dorsal surface of eye with several small, irregular (typically elongate) black or dark brown spots; Dorsal surface of snout and nape scattered small dark brown spots about size of pupil or slightly smaller; Two dark brown spots, sometimes tinged with yellow, on pectoral-fin base; Dorsum of body mottled with dark brown; Lateral wall of abdominal cavity bright white; Most of scales on body with faint yellow center in larger specimen; About five small saddle-like bright white blotches along bases of dorsal fins (obscure in freshly collected specimen); Midlateral body with series of alternating large and small dark brown spots, typically enclosed by faint dark brown horizontal lines dorsoventrally; T or Y-shaped, faint dark brown marking at midlateral base of caudal fin; Spines of first dorsal fin with alternating dark brown and white bands; A small but distinct black blotch at distal tip of first dorsal fin from first and second interradial membrane, not reaching posteriorly to third spine; Black dorsal-fin spot bordered by white anteroventrally, orange yellow posteroventrally; A wavy dark brown horizontal line along base of first dorsal fin; Dorsal filaments typically with alternating bands of orange and white (filament of holotype short and entirely whitish); Second dorsal fin nearly translucent, tinged with narrow gray distally; Rays of second dorsal fin sometimes with alternative white and dusky markings; One or two faint, horizontal rows of orange spots near base of second dorsal fin visible in some specimens just after fixation; Anal fin subtranslucent, whitish or grayish, with several faint orange spots on posterior part in some specimens; caudal fin subtranslucent, with faint orange spots at middle rays forming some transverse bars in some specimens; Pectoral fin translucent; Pelvic fin white, dark brown, or grayish.
Etymology
Ancistrogobius: from Greek, agkistros = fishhook + from Latin, Gobius = a genus name of gobiine fish. Named in reference to the short, ventrally directed, spur-like preopercular spine.
dipus: from Greek, dis = two + from Greek, pous = foot. Referring to its largely separated pelvic fins.
Original description: Ancistrogobius dipus Shibukawa, Yoshino & Allen, 2010 - Type locality: Funauki Bay, Iriomote-jima Island, Yaeyama Group, Ryukyu Islands, Japan, depth 35 meters, 11 May 2002 (collected by K. Yano).
Distribution
Southern Japan, Papua New Guinea, Solomon Islands, Indonesia, Micronesia, Australia and New Caledonia.
Biology
Reported from sandy-mud or silt bottoms with dead-coral rubble.
Similar species
Ancistrogobius yanoi (Shibukawa, Yoshino & Allen, 2010) - Reported from Red Sea; Indo-West Pacific: Indonesia east to Caroline Islands and New Ireland (Papua New Guinea), south to Solomon Islands.
Last update: 1, April 2023
Actinopterygii (Gigaclass) > Actinopteri (Class) > Teleostei (Subclass) > Gobiiformes (Order) > Gobioidei (Suborder) > Gobiidae (Family) > Gobiinae (Subfamily) > Ancistrogobius (Genus)
Doublefoot goby, Double-fin cheek-hook goby, Largetooth goby, Futahire ho’okagi-haze, フタヒレホオカギハゼ,
Description
Dorsal spines (total): 7; Dorsal soft rays (total): 9-10 (usually: 10) ; Anal spines: 1; Anal soft rays: 9; Pectoral fin rays: 19-21 (usually: 20); Pelvic fin rays: I, 5; Segmented caudal fin rays: 9+8, including: 6+6 branched rays; Dorsal unsegmented caudal-fin rays: 7-9; Ventral unsegmented caudal-fin rays: 5-8; Longitudinal scales: 24-26; Transverse scales from anal-fin origin upward and forward to dorsal-fin base: 8-10; Transverse scales from anal-fin origin upward and backward to dorsal fin base: 7-9; Transverse scales from second dorsal fin base downward and backward to anal-fin base: 7-8; Circumpeduncular scales: 12; Gill rakers: 1+9 or 2+8 or 2+9; Pseudobranchial filaments: 8-9. Largely separated pelvic fin with rudimentary connecting membrane and no frenum; Fifth segmented ray of pelvic fin short, its length: 67.9–71.9 % of preceding ray; Head and most of nape naked and no predorsal scales (except for a single specimen, with one predorsal scale); Third spine of first dorsal fin greatly elongated, filamentous, obviously longer than preceding spine. Max. length: 4.2 cm SL. Depth range: 15 - 35 m.
Color
Ground color of head and body pale brown or pale gray dorsally, becoming paler ventrally; Cheek with at least some dark brown spots smaller than pupil (sometimestinged with yellow), those at corner of mouth typically largest and most conspicuous; In addition, several faint yellowish small spots sometimes present on cheek; Dorsal part of operculum with several faint dusky spots, sometimes tinged with yellow; Dorsal surface of eye with several small, irregular (typically elongate) black or dark brown spots; Dorsal surface of snout and nape scattered small dark brown spots about size of pupil or slightly smaller; Two dark brown spots, sometimes tinged with yellow, on pectoral-fin base; Dorsum of body mottled with dark brown; Lateral wall of abdominal cavity bright white; Most of scales on body with faint yellow center in larger specimen; About five small saddle-like bright white blotches along bases of dorsal fins (obscure in freshly collected specimen); Midlateral body with series of alternating large and small dark brown spots, typically enclosed by faint dark brown horizontal lines dorsoventrally; T or Y-shaped, faint dark brown marking at midlateral base of caudal fin; Spines of first dorsal fin with alternating dark brown and white bands; A small but distinct black blotch at distal tip of first dorsal fin from first and second interradial membrane, not reaching posteriorly to third spine; Black dorsal-fin spot bordered by white anteroventrally, orange yellow posteroventrally; A wavy dark brown horizontal line along base of first dorsal fin; Dorsal filaments typically with alternating bands of orange and white (filament of holotype short and entirely whitish); Second dorsal fin nearly translucent, tinged with narrow gray distally; Rays of second dorsal fin sometimes with alternative white and dusky markings; One or two faint, horizontal rows of orange spots near base of second dorsal fin visible in some specimens just after fixation; Anal fin subtranslucent, whitish or grayish, with several faint orange spots on posterior part in some specimens; caudal fin subtranslucent, with faint orange spots at middle rays forming some transverse bars in some specimens; Pectoral fin translucent; Pelvic fin white, dark brown, or grayish.
Etymology
Ancistrogobius: from Greek, agkistros = fishhook + from Latin, Gobius = a genus name of gobiine fish. Named in reference to the short, ventrally directed, spur-like preopercular spine.
dipus: from Greek, dis = two + from Greek, pous = foot. Referring to its largely separated pelvic fins.
Original description: Ancistrogobius dipus Shibukawa, Yoshino & Allen, 2010 - Type locality: Funauki Bay, Iriomote-jima Island, Yaeyama Group, Ryukyu Islands, Japan, depth 35 meters, 11 May 2002 (collected by K. Yano).
Distribution
Southern Japan, Papua New Guinea, Solomon Islands, Indonesia, Micronesia, Australia and New Caledonia.
Biology
Reported from sandy-mud or silt bottoms with dead-coral rubble.
Similar species
Ancistrogobius yanoi (Shibukawa, Yoshino & Allen, 2010) - Reported from Red Sea; Indo-West Pacific: Indonesia east to Caroline Islands and New Ireland (Papua New Guinea), south to Solomon Islands.
Last update: 1, April 2023