Ichthyococcus parini Mukhacheva 1980

View data on Catalog of Fishes here.

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; 9^th displaced medially and reduced in size: 10^th shifted laterally, but less than 9^th ; 11^th 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.

I. parini is very similar to I. irregularis in the arrangement of the IV photophores before the base of the pectoral fin, and in the interrupted row of AC photophores, but is well differentiated from I. irregulais, both by the slightly different position of these photophores, and by narrower interorbital distance (narrower by 1.5–2 times), fewer gill rakers on 1st arch (21–23, vs. 25–28) and more photophores in the OA (23–25,vs. 23) and IV (25–26, vs, 23–24).

Ichthyococcus parini has a fairly narrow range with all records from the northern Inidan Ocean, the south of the Arabian Sea, in the Bay of Bengal, and around Sri Lanka.

Mukhacheva V. 1980. A review of the genus Ichthyococcus Bonaparte (Photichthyidae). Voprosy Ikhtiologii 20(6):771–786.

The following description from Mukhacheva (1980) applies to all species of Ichthyococcus.

Eye large, telescopic, directed obliquely or dorsally. Interorbital distance less than snout length and eye diameter, thin supraorbital crest above each orbit. Snout short, blunt. Mouth small, straight or slightly oblique; anterior part of lower jaw contained in upper jaw with mouth closed. Teeth on both jaws very small, closely set, of uniform size, in a single row. Vomer lacking teeth, or with few, barely perceptible teeth; palatine, pterygoid and tongue lacking teeth. Gill rakers short, smooth, 19–37 on first arch. Pseudobranchia absent. Body covered with large deciduous scales. Origin of dorsal fin equidistant from end of snout and base of caudal fin or nearer former. Origin of anal fin far beyond vertical through end of dorsal fin. Origin of dorsal adipose fin on vertical through anus. Bases of pelvic fins above middle of dorsal fin. Ventral adipose fin small or absent. Anus immediately in front of anal fin.

Dorsal-fin rays 10–16; Anal-fin rays 12–17; Pectoral-fin rays 7–8; V 6–8; lateral line scales 32–44; vertebrae 38–42 . Photophores. SO 0-1, ORB 2, in front of eyes and beneath center of orbit: OP 3, upper on same level as center of eye or slightly higher, lower anterior approximately on same level as end of maxillary, lower posterior behind it, nearer margin of operculum, BR 11-13. Body with 2 rows of photophores: IV 23-28, 1–7 in straight row, 8th displaced upward and outward, others in straight row, or partly on broken line from 8th to 14th, others in straight row; VAV 9–16; AC 11–15, in unbroken row or with hiatus above last few anal-fin rays. OA 23–34, not reaching anal fin.

Mukhacheva V. 1980. A review of the genus Ichthyococcus Bonaparte (Photichthyidae). Voprosy Ikhtiologii 20(6):771–786.

To at least 49 mm SL.

Northern Indian Ocean, 9°22'N, 69°16'E, depth 870-985 meters.

Holotype: ZIN 44083.

Dorsal spines (total): 0; Dorsal soft rays (total): 12 - 13; Analspines: 0; Analsoft rays: 14 - 16

Ichthyococcus parini és una espècie de peix pertanyent a la família Phosichthyidae.

Ichthyococcus parini is a lightfish of the genus Ichthyococcus.

Ichthyococcus parini​ es un pez que pertenece a la familia Phosichthyidae.​ Esta especie fue reconocida por primera vez en 1980 por Valentina A. Mukhacheva.​

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Ichthyococcus parini Ichthyococcus generoko animalia da. Arrainen barruko Phosichthyidae familian sailkatzen da.