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Author: Collett, 1889

Photostomias guernei Collett, 1889

Diagnosis: body rather slender, its depth 8-20 times in SL. Head moderate, its length 4 1/3-6 1/4 times in SL; snout shorter than eye, two nostrils on each side; no chin barbel. Dorsal finrays 22-29; anal finrays 25-33: pectoral fins absent; dorsal and anal fins not partly covered by black skin; pelvic fins very long, 38-56% of SL, their innermost ray attached tc body by a membrane. Serial photophores conspicuous; in ventral row from front of isthmus to tail (IC) 55-60; in lateral series to above anterior end of anal fin (OA) 34-39, photophores in both rows evenly spaced; a single row of photophores on each side of isthmus. Pre-orbital luminous organ present; sub-orbital organ absent; post- orbital organ more or less triangular, longer than wide; no pale luminous spots or lines on head. Colour: head and body black; no pale spots or lines on head. Size: to about 13.5 cm.

Habitat, etc.: see family.

Distribution: northward to 45° N, 18° W. Elsewhere, Gulf of Mexico and probably across the North Atlantic between about 17° and 40° N.

Note: Two very similar new species that occur in the Clofnam area are being described by R. H. Goodyear. Both have 3 paired groups of teeth on the basibranchials (guernei has 2 paired groups) and both attain a larger maximum size than guernei. One of the undescribed species extends to about 20° S in the Atlantic.

Eggs, larvae and young stages. No data.
Otoliths (sagitta). No data.

Photostomias guernei