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The following description of characters, from Mukhacheva (1980), includes an average value followed by range in parentheses: dorsal-fin rays 13 (12–13), anal-fin rays 15 (14–16), pectoral-fin rays 7(7–8), pelvic-fin rays 7 (1), branchiostegal rays 13 (12–13): gill rakers on first arch 22 (21–23), lateral-line scale 37 (37–39).

Greatest depth contained 3.1 (2.8–3.1) times into SL, depth of caudal peduncle 9.2 (8.0– 9.4) times. Head length contained 3.5 (3.0– 3.3) times in SL. Interorbital distance narrow, width 15.5 (12.0–18.0) times into head length. Supraorbital crests strongly converged, but upper parts not contacting above middle of omit (Fig. 2, c).

Photophores: ORB 2(2); OP 3(3); SO l(l); BR 12 (12–13); OA 24 (23–25), most often 24, final one on vertical through anus; IV 25(25–26), most often 25; 26 on one side in 1 specimen), row of IV photophores uneven, photophores arranged as follows before base of pectoral fin: 8th displaced dorsally and laterally; 9th displaced medially and reduced in size: 10th shifted laterally, but less than 9th ; 11th displaced medially; thereafter the photophores gradually even out, forming a straight row beyond the base of the pectoral fins; VAV 9(9–10, usually 9, 10 on one side in 1 specimen); AC 14(12–14, most often 13), of which 9(7–9) along base of anal fin and 5(4–6) on caudal peduncle, this row interrupted to rear of anal fin, so that the 4–6 photophores on the caudal peduncle are separated from the preceding ones by an increased distance; distance between final and penultimate photophores above anal fin also increased in holotype and 2 paratypes. IC 48 (46–48).

For a key to photophore terminology, click here.


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© Kenaley, Christopher

Source: Deep-sea Fishes of the World

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