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Squalus lobularis
Viana, De Carvalho & Gomes, 2016
Classification: Elasmobranchii Squaliformes Squalidae
Reference of the original description
Taxonomy and morphology of species of the genus Squalus Linnaeus, 1758 from the Southwestern Atlantic Ocean (Chondrichthyes: Squaliformes: Squalidae). Zootaxa, 4133(1), 1–89
Taxonomy and morphology of species of the genus Squalus Linnaeus, 1758 from the Southwestern Atlantic Ocean (Chondrichthyes: Squaliformes: Squalidae). Zootaxa, 4133(1), 1–89
Types
Squalus lobularis
Holotype: HUMZ: 91806; Paratype: HUMZ: 30026; HUMZ: 30032; HUMZ: 91801; HUMZ: 91804; HUMZ: 91807; UERJ: 1661; UERJ: 2024; UERJ: 2025; UERJ: 2026;
Squalus lobularis
Holotype: HUMZ: 91806; Paratype: HUMZ: 30026; HUMZ: 30032; HUMZ: 91801; HUMZ: 91804; HUMZ: 91807; UERJ: 1661; UERJ: 2024; UERJ: 2025; UERJ: 2026;
Images of types
Description :
Citation: Squalus lobularis Viana, De Carvalho & Gomes, 2016: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 12/2024
Please send your images of "Squalus lobularis" to info@shark-references.com
Holotype of Squalus lobularis (HUMZ 91806, juvenile female, 557 mm TL) in lateral and ventral views; © Viana, De Carvalho & GOMES, 2016
Holotype of Squalus lobularis (HUMZ 91806, juvenile female, 557 mm TL) in lateral and ventral views; © Viana, De Carvalho & GOMES, 2016
Common names
Atlantic lobefin dogfish, 
Cação-bagre-de-nadadeiras-lobadas
Atlantic lobefin dogfish, Cação-bagre-de-nadadeiras-lobadas
Short Description
Original diagnosis after DE F. VIANA, DE CARVALHO & GOMES, 2016 [24274]: A species of Squalus from SWAO that differs from its congeners by the combination of having markedly broad and lobe-like dorsal fins and short clasper groove, not reaching the rhipidion. Squalus lobularis sp. nov. is clearly distinct from S. mitsukurii from Japan, its morphologically closest congener, by having a slender body (vs. highly robust body in S. mitsukurii), pectoral-fin posterior margin concave (vs. pectoral-fin posterior margin straight in S. mitsukurii), narrower interorbital space (8.8%, 6.8%–8.5% TL vs. 9.3%, 9.1%–9.8% TL in S. mitsukurii); and inner clasper length 1.4 times pelvic-fin inner margin length (vs. 0.7–1.1 times in S. mitsukurii). Squalus lobularis sp. nov. further differs from species of the Squalus megalops group by: snout relatively long vs. snout short; pectoral fins markedly broad vs. pectoral fins often very narrow; pectoral free rear tips rounded and lobe-like vs. pectoral free rear tips often triangular; dermal denticles tricuspidate vs. lanceolate. It further differs from all its congeners by having a much larger pectoral-inner margin length (10.5%, 9.2%–11.0% TL), except from S. acanthias.
Original diagnosis after DE F. VIANA, DE CARVALHO & GOMES, 2016 [24274]: A species of Squalus from SWAO that differs from its congeners by the combination of having markedly broad and lobe-like dorsal fins and short clasper groove, not reaching the rhipidion. Squalus lobularis sp. nov. is clearly distinct from S. mitsukurii from Japan, its morphologically closest congener, by having a slender body (vs. highly robust body in S. mitsukurii), pectoral-fin posterior margin concave (vs. pectoral-fin posterior margin straight in S. mitsukurii), narrower interorbital space (8.8%, 6.8%–8.5% TL vs. 9.3%, 9.1%–9.8% TL in S. mitsukurii); and inner clasper length 1.4 times pelvic-fin inner margin length (vs. 0.7–1.1 times in S. mitsukurii). Squalus lobularis sp. nov. further differs from species of the Squalus megalops group by: snout relatively long vs. snout short; pectoral fins markedly broad vs. pectoral fins often very narrow; pectoral free rear tips rounded and lobe-like vs. pectoral free rear tips often triangular; dermal denticles tricuspidate vs. lanceolate. It further differs from all its congeners by having a much larger pectoral-inner margin length (10.5%, 9.2%–11.0% TL), except from S. acanthias.
Distribution
southern Brazil to Uruguay and Patagonia in Argentina. Its occurrence in the coast of Espírito Santo, Brazil (C. Magenta, pers. comm.), is still doubtful due to lack of precise locality information [24274]
southern Brazil to Uruguay and Patagonia in Argentina. Its occurrence in the coast of Espírito Santo, Brazil (C. Magenta, pers. comm.), is still doubtful due to lack of precise locality information [24274]
Dentition
Unicuspid teeth, similar in both jaws, markedly broad at crown, flattened labial-lingually and alternating; upper teeth smaller and narrower than lower teeth; cusp thick and short, oblique and directed laterally; mesial cutting edge conspicuously convex; mesial heel pointed; distal heel markedly rounded; apron thick, although larger on lower teeth than upper teeth; two series of functional teeth in upper and lower jaws; tooth rows varying from 13–13 (13–13 paratypes) in upper jaw and 11–10 (12–11 paratypes) in lower jaw [24274]
Unicuspid teeth, similar in both jaws, markedly broad at crown, flattened labial-lingually and alternating; upper teeth smaller and narrower than lower teeth; cusp thick and short, oblique and directed laterally; mesial cutting edge conspicuously convex; mesial heel pointed; distal heel markedly rounded; apron thick, although larger on lower teeth than upper teeth; two series of functional teeth in upper and lower jaws; tooth rows varying from 13–13 (13–13 paratypes) in upper jaw and 11–10 (12–11 paratypes) in lower jaw [24274]
Remarks
shark-references Species-ID=14605;
shark-references Species-ID=14605;
