Squalus

De, Sarah T., De, Marcelo R. & Gomes, Ulisses L., 2016, Taxonomy and morphology of species of the genus Squalus Linnaeus, 1758 from the Southwestern Atlantic Ocean (Chondrichthyes: Squaliformes: Squalidae), Zootaxa 4133 (1), pp. 1-89: 83

publication ID

http://doi.org/10.11646/zootaxa.4133.1.1

publication LSID

lsid:zoobank.org:pub:E7276A63-67C8-4BC5-8419-2EBDAE4432B0

persistent identifier

http://treatment.plazi.org/id/282F878E-FFDB-FFDD-14C0-2398FA615889

treatment provided by

Plazi

scientific name

Squalus
status

 

Key to species of Squalus  from the Southwestern Atlantic Ocean

1 a. First dorsal spine placed well behind vertical line traced at adpressed pectoral free rear tips; white spots dorsally on body; unilobed anterior margin of nostrils; pectoral girdle with anterolateral segmented processes................... S. acanthias  .

1 b. First dorsal spine placed over or before vertical line traced at adpressed pectoral rear tips; body uniformly colored dorsally; bilobed anterior margin of nostrils; pectoral girdle without any segmented processes............................... 2.

2 a. Prenarial length smaller than distance between nostril and upper labial furrow; upper caudal lobe very narrow; pectoral fins very narrow with pectoral free rear tips pointed and angular; caudal fin mostly white; dermal denticles unicuspid and lanceolate; dorsal terminal cartilage (claw) short, thick and straight at tip; accessory terminal cartilage (spur) broad and small.............................................................................................. S. albicaudus  .

2 b. Prenarial length greater than distance between nostril and upper labial furrow; upper caudal lobe broad and rectangular; pectoral fins broad with pectoral free rear tips rounded and lobe-like; caudal fin grayish; dermal denticles tricuspid and rhomboid; dorsal terminal cartilage (claw) very elongate, slender and hook-like at tip; accessory terminal cartilage (spur) thin and large.................................................................................................... 3.

3 a. Body robust and markedly humped dorsally; first dorsal fin conspicuously slender only from its midline to apex; second dorsal fin upright and markedly tall (height 4.0%– 5.3 % TL); dermal denticles markedly imbricate and broad at crown...................................................................................................... S. quasimodo  .

3 b. Body very slender throughout, without a dorsal hump; first dorsal fin uniformly slender; second dorsal fin raked and low (height 3.7 %– 4.4 % TL); dermal denticles not imbricate and very narrow.......................................... 4

4 a. First and second dorsal fins very broad; caudal fin dark gray with dorsal caudal margin light gray and ventral caudal lobe uniformly dark gray; interdorsal space 21.9 %– 24.1 % TL; dorsal caudal space 10.4 %– 10.9 % TL; pectoral-caudal space 20.3 %– 24.4 % TL in adults; pectoral inner margin 9.2 %– 10.6 % TL........................................... S. lobularis  .

4 b. First and second dorsal fins narrow; caudal fin light gray with dorsal caudal margin white and ventral caudal lobe mostly white; interdorsal space (24.4 %– 26.8 % TL); dorsal-caudal space 11.0%– 12.2 % TL; pectoral-caudal space 19.5 %– 20.3 % TL; pectoral inner margin 8.4 %– 8.9 % TL........................................................... S. bahiensis  .