Thorogobius alvheimi Sauberer & Iwamoto & Ahnelt 2018, sp. nov.

• Main Authors: Sauberer, Michael, Iwamoto, Tomio, Ahnelt, Harald
• Format: Other/Unknown Material
• Language: unknown
• Published: 2018
• Subjects: Biodiversity; Taxonomy; Animalia; Chordata; Actinopterygii; Perciformes; Gobiidae; Thorogobius; Thorogobius alvheimi; Fridtjof; Keta; Fridtjof Nansen
• Online Access: https://zenodo.org/record/5996514; https://doi.org/10.5281/zenodo.5996514

Thorogobius alvheimi sp. nov. (Figures 1–3, 7; Tables 1–3) Holotype. CAS 222482, female, standard length+caudal fin length 72.1+ 19.8 mm; Angola, off Luanda (8°24′S, 12°56′E) at depths of 166– 162 m, R/ V Dr. Fridtjof Nansen (DFN) stn. 3713, 15 April 2005. Paratypes. (8 specimens). Angola: CAS 222338, 1 male 51.8+d mm SL+CL, 1 female 52.3+d mm SL+CL, sw. of Congo R. mouth (6°27′S, 11°55′E), 109– 108 m, DFN stn. 3783, 22 April 2005; CAS 244059, 1 male 102.4+d mm SL+CL, same data as for holotype; CAS 225193, 1 female 52.2+d mm SL+CL, off Luanda (8°53.5′S, 13°02.21′E) 190– 187 m, DFN stn. 102, 11 March 2007; NMW 99079, 1 female 62.6+ 20.2 mm SL+CL, same data as for CAS 222338. Ghana: CAS 243855, 1 female 64.1+ 17.4 mm SL+CL, off Accra (5°16.44′N, 0°10.65′W), 91– 88 m, DFN stn. 13, 2 May 2010; CAS 243856, 1 male 51.3+ 15.3 mm SL+CL, off Keta (5°49.26′N, 1°07.57′E), 84– 74 m, DFN stn.4, 1 May 2010; CAS 243857, 1 female 58.6 + d mm SL+CL, se. off Keta, (5°53.89′N, 1°16.37′E), 208– 201 m, DFN stn. 2, 2 May 2010. Non-type specimens. (4 specimens). Excluded from type material because of damage and/or juvenile stage. CAS 244060, 4 specimens of undetermined sex (37.9–46.5 mm SL), same data as for holotype. Diagnosis. Thorogobius alvheimi sp. nov. is distinguished from its congeners in the combination of following characters: Fins: first dorsal fin with six spiny rays, second and third distinctly elongated; pectoral fin ray count 20–21; pelvic disc complete and short with well-developed anterior membrane (frenum), with pointed lateral lobes. Scales: nape and predorsal area naked; no scales on the opercle; scales in longitudinal series 27–31. Pattern of free neuromasts: supratemporal rows tr and trp developed, extending transversally between pores H and K; longitudinal row g short, not passing row m posteriorly and distinctly distant from row h; infraorbital row 6 long, ventrally extending to lower margin of preopercle, its ventral section 6i originating anterior to its dorsal section 6s; posterior lateral row h reaching ...