Squalus boretzi

DOLGANOV, 2019



Classification: Elasmobranchii Squaliformes Squalidae

Reference of the original description
DOLGANOV, V.N. (2019)
Squalus boretzi sp. n. (Squalidae), a New Squalid Shark Species from the Emperor Seamount Chain, Pacific Ocean [in Russian with English abstract]. Biology of the Sea, 45 (4): 279-285

Types
Squalus boretzi
Holotype: ZIN: 56397; Paratype: ZIN: 56398; ZIN: 56399;


Description :


Citation: Squalus boretzi DOLGANOV, 2019: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 02/2021

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Common names
eng Boretzi's Dogfish

Short Description
Diagnose after DOLGANOV, 2019 [27588]: Body fairly slender. Воdу length to second dorsal fin 61.6-67.1% ТL, precaudal length 78.4-83.8% TL. Snout moderately long, diagonal distance from snout tip to ехсurreпt aperture of nostril greater than that from excurreпt aperture to upper labial furrow. Distance between second dorsal fin and caudal fin origin са. 2.5 times in interdorsal length (21.4- 28.6% TL). Length of upper caudal lobe approximately equal to distance from snout tip to fifth gill opening. Pectoventral distance (25.2- 30.6% TL) much greater than antepectoral (20.9- 24.1% TL). Dorsal fins large, with first dorsal fin base length 6.7-8.6% TL, second dorsal fin base length 4.5-6.3% TL. Pelvic fm origins much closer to first dorsal fin base than to second. Vertebral number: monospondylous 41-45, precaudal 82-87, caudal 28-32, and total 111-116. Number of spiral valves 11-12. In juveniles and embryos, dorsal fm tip and margins of upper and lower caudal lobes black. Colour of adults grey; fins darker with no black areas.

Distribution
Emperor Seamount Chaio, Pacific Осеаn [27588]

Size / Weight / Age
TL (max, types): 952 mm [27588]

Habitat
marine; depth range: 100-525 m [27588]

Dentition
The teeth of the upper and lower jaw are the same in shape. They are very bent disataly to the corners of the mouth, forming a single cutting row. One male (TL 625 mm) shows on both jaws a symphysis teeth with an upright crown. Dental formula: upper jaw 12-14, 0-1, 12-15; lower 11-13, 0-1, 10-12. [27588]

Remarks
shark-references Species-ID=15503