Lampris incognitus
| Lampris incognitus | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Lampris incognitus | ||||||||||||
| Underkoffler , Luers , Hyde & Craig , 2018 |
Lampris incognitus (English: Smalleye Pacific Opah) is a species of god salmon ( Lampris ) that occurs in the central and northeastern Pacific. It was onlydescribedas adifferent speciesfrom Lampris guttatus in 2018, after a study based on DNA comparisons from 2014 revealed thatfive cryptic species were hiddenbehind the name Lampris guttatus .
features
Like all divine salmon, Lampris incognitus is a large fish with an approximately round, laterally flattened body. The type specimens examined in the first description had standard lengths of 82.8 and 86.2 cm, the body length being 1.4 to 1.5 times the body height. The fish are steel blue on the back and silvery on the belly. The head and the entire body are densely covered with numerous white spots that come in two sizes. The fins are bright red. The dorsal fin and caudal fin sometimes have white tips. The rear edge of the caudal fin is transparent. The tongue is usually pink in color. The scales are small, thin, and easily fall off. The sideline begins at the upper gill slit, then runs in a high arc above the base of the pectoral fin and then along the middle of the body to the middle of the caudal peduncle. The mouth is strongly protruding (protractile). The upper jaw is shorter than the slightly protruding lower jaw. The jaw and palate are toothless.
- Fin formula : dorsal I / 49–50, anal 40, pectoral 22, ventral 15.
Lampris incognitus is difficult to distinguish from Lampris megalopsis , with which it shares a small part of the range in the central North Pacific. In Lampris incognitus , the horizontal eye diameter is usually less than 5% of the total length, in L. megalopsis the eye diameter is usually greater than 5% of the total length. Lampris incognitus feeds mainly on epipelagic fish, while L. megalopsis eats zooplankton .
In 2015 it became known that god salmon can keep their blood temperature five degrees above that of the surrounding water by generating heat with the movements of the pectoral fins, which is distributed throughout the body. The fish examined at that time were identified as Lampris guttatus . In fact, they were specimens of Lampris incognitus .
Individual evidence
- ↑ a b c d e Underkoffler, KE, Luers, MA, Hyde, JR & Craig, MT (2018): A taxonomic review of Lampris guttatus (Brünnich 1788) Lampridiformes; Lampridae) with descriptions of three new species. Zootaxa, 4413 (3): 531-540. DOI: 10.11646 / zootaxa.4413.3.9
- ↑ Hyde, J., Underkoffler, K. & Sundberg, M. (2014): DNA barcoding provides support for a cryptic species complex within the globally distributed and fishery important opah ( Lampris guttatus ). Molecular Ecology Resources, 14, 1239-1247. doi: 10.1111 / 1755-0998.12268
- ↑ Choy, C., Portner, E., Iwane, M. & Drazen, JC (2013) Diets of five important predatory mesopelagic fishes of the central North Pacific. Marine Ecology Progress Series, 492, 169-184. doi: 10.3354 / meps10518
- ↑ Nicholas C. Wegner, Owyn E. Snodgrass, Heidi Dewar, John R. Hyde: Whole-body endothermy in a mesopelagic fish, the opah, Lampris guttatus. Science 348 (6236): 786-789, 2015. doi : 10.1126 / science.aaa8902