Diplecogaster tonstricula, a new species of cleaning clingfish (Teleostei: Gobiesocidae) from the Canary Islands and Senegal, eastern Atlantic Ocean, with a review of the Diplecogaster-ctenocrypta species-group Author Fricke, Ronald Lauda-Königshofen, Germany; & Zoology, Staatliches Museum für Naturkunde in Stuttgart, Stuttgart, Germany; Author Wirtz, Peter Centro de Ciências do Mar, Universidade do Algarve, Faro, Portugal; Author Brito, Alberto BIOECOMAC, UD de Ciencias Marinas, Sección de Biología, Facultad de Ciencias, Universidad de La Laguna, La Laguna, Tenerife, Spain text Journal of Natural History 2015 2015-08-31 50 731 748 http://dx.doi.org/10.1080/00222933.2015.1079659 journal article 10.1080/00222933.2015.1079659 5b8d9e7d-dcf7-4ff0-b063-4f0843203f7b 1464-5262 3989731 01E9C7DC-5979-40B6-A356-DF5731265F11 Diplecogaster ctenocrypta Briggs 1955 Eastern Atlantic deep water clingfish ( Figures 7 – 9 ) Diplecogaster ctenocrypta Briggs 1955: 32 , figure 85 [ Gran Canaria , Canary Islands , depth 90 fms ( 164.6 m ); holotype ZMUC P9037 ]. Nielsen 1974: 85 (type catalogue). Dooley et al. 1985: 43 ( Canary Islands ; in checklist). Briggs 1990: 475 ( Canary Islands ). Hofrichter 1995: 156 – 159 , figures 95 – 97. Hofrichter & Patzner 1997: 21 . Fricke 2007: 68 . Almada et al. 2008: 1151 . Hanel et al. 2009: 166 (in checklist). Fricke et al. 2010: 92 . Figure 7. Diplecogaster ctenocrypta Briggs 1955 , ZMUC P9037, holotype, 15.7 mm SL, Gran Canaria. (A) Lateral view; (B) dorsal view. Bar 2 mm. Figure 8. Diplecogaster ctenocrypta Briggs 1955 , ZMUC P9037, holotype, 15.7 mm SL, Gran Canaria. Pelvic disc. Bar 1 mm. Figure 9. Diplecogaster ctenocrypta Briggs 1955 , ZMUC P9037, holotype, 15.7 mm SL, Gran Canaria. (A) dorsal view of head; (B) ventral view of head. Bar 1 mm. Material ZMUC P9037 , holotype , 15.7 mm SL, Eastern Atlantic Ocean , Canary Islands , Gran Canaria, off La Luz , hard bottom with algae, 90 fms [ 165 m ] depth, T . Mortensen, 28 March 1930 . Diagnosis A species of Diplecogaster with 9 dorsal-fin rays, 8 anal-fin rays, 25 pectoral-fin rays, and 16 principal caudal-fin rays; pelvic disc with lateral papillae in region A; disc region B with 5 rows of papillae; principal caudal-fin rays 16; interorbital distance 5.4 in head length; distance between disc and anus 19% of SL; head and body pale, without bars or ocelli. Description Dorsal-fin ix; anal-fin viii; pectoral-fin xxv; caudal-fin xvi. Gill rakers on 3rd arch 18, very small, pointed. Teeth small, conical, slightly recurved, in patches towards the front of each jaw, narrowing to a line of single teeth laterally. Head lateral line system with 3 pores in nasal canal, 3 pores in postorbital canal, 1 pore in mandibular canal, and 2 pores in lacrymal canal ( Figure 9 ). Head broad, depressed. Head length 39.5% SL ( 2.5 in SL). Maximum body depth 17.2% SL ( 5.8 in SL). Maximum head width 16.6% SL (6.0 in SL). Maximum (horizontal) orbit diameter 11.1% SL ( 3.5 in head length). Snout short, anteriorly straight ( Figure 7B ). Preorbital length 7.6% SL ( 5.2 in head length). Interorbital distance 7.3% SL ( 5.4 in head length). Upper jaw length 10.8% SL ( 3.6 in head length). Anus situated much closer to the anal-fin origin than to the disc; distance between disc and anus 19.1% SL, distance between anus and anal-fin origin 7.6% SL. Preanus length 66.8% SL ( 1.5 in SL). Caudal – peduncle length 11.5% SL ( 8.7 in SL). Caudal – peduncle depth 13.4% SL ( 7.5 in SL). Predorsal-fin length 72.0% SL ( 1.4 in SL). Preanal-fin length 73.2% SL ( 1.4 in SL). Prepectoralfin length 40.1% SL ( 2.5 in SL). Predisc length 20.4% SL ( 4.9 in SL). Disc length 25.5% SL ( 3.9 in SL). Disc membrane inserting at base of 21st pectoral-fin ray. Disc with 4 rows of papillae in region A, 5 rows of papillae in region B, and 4 rows of papillae in region C ( Figure 8 ). Several rows of lateral papillae in disc region A. Caudal-fin length 17.2% SL ( 5.8 in SL). Colour in life Unknown. Colour in alcohol Head and body yellowish white; eyes dark grey. Distribution Eastern Atlantic Ocean : Canary Islands (Gran Canaria) . Probably more widespread in the region. The species was collected at 165 m depth, on hard substrate among algae. Remarks A record of Diplecogaster ctenocrypta ( non Briggs 1955 ) from the Gulf of Guinea by Böhlke and Robins (1970 , p. 6) is probably based on a different species.