Luciogobius fonticola Kanagawa, Itai & Senou, 2011
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Family:  Gobiidae (Gobies), subfamily: Gobionellinae
Max. size:  3.29 cm SL (male/unsexed); 3.7 cm SL (female)
Environment:  demersal; brackish
Distribution:  Northwest Pacific: Abe and Oi River Systems entering Suruga Bay, on the Pacific coast of Shizuoka Prefecture in Japan.
Diagnosis:  Dorsal soft rays (total): 7-9; Anal spines: 1-1; Anal soft rays: 7-9; Vertebrae: 30-31. Diagnosed from all other species of Luciogobius by having the following combination of characters: eye small and degenerated, embedded beneath skin, obscured after fixation; body naked, without scales; dermal ridge on cheek lacking barbels; second dorsal-fin origin slightly anterior ro anal fin; pelvic fin present; no free soft rays on upper and lower ends of pectoral fin; second dorsal-fin rays modally I,8; anal-fin rays modally I,8; branched caudal-fin rays modally 8+7; vertebrae modally 15=16=31; interorbit region flat; upper jaw length 10.5% in SL; 39.2% in head length; predorsal length 261.2% head length; preanal length 267.9% in head length; caudal peduncle depth 7.3% in SL (Ref. 86963).
Biology:  Found in the river mouth on a gravel substrate composed of sand and pebbles, where freshwater springs flow from gaps between the pebbles (Ref. 86963).
IUCN Red List Status: Data deficient (DD); Date assessed: 23 July 2018 Ref. (124695)
Threat to humans:  harmless
Country info:  Type locality, Shizouka Pref., lower reaches of Oi River, KPM-NI 27293 (holotype of Luciogobius fonticola, 3.09 cm SL, male) (Ref. 86963). Found only in the Abe and Oi River Systems entering Suruga Bay, on the Pacific coast of Shizuoka Prefecture in southern Japan. Collected from river mouth (Ref. 86963). Status of threat: Near threatened (Ref. 94887).

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