Squalus albicaudus

VIANA, DE CARVALHO & GOMES, 2016



Classification: Elasmobranchii Squaliformes Squalidae

Reference of the original description
VIANA, S.T.F.L. & DE CARVALHO, M.R. & GOMES, U.L. (2016)
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 albicaudus
Holotype: MNRJ: 30188; Paratype: MNRJ: 30173; MNRJ: 30174; MNRJ: 30175; MNRJ: 30176; MNRJ: 30177; MNRJ: 30181; MNRJ: 30183; MNRJ: 30184; MNRJ: 30185; MNRJ: 30186; MNRJ: 30187;

Images of types

Description :


Citation: Squalus albicaudus VIANA, DE CARVALHO & GOMES, 2016: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 03/2021

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Holotype of Squalus albicaudus (MNRJ 30188, adult male, 525 mm TL) in lateral and ventral views © VIANA, DE CARVALHO & GOMES, 2016
Common names
eng Brazilian whitetail dogfish, por Cação-bagre-de-cauda-branca

Short Description
Original diagnosis after DE F. VIANA, DE CARVALHO & GOMES, 2016 [24274]: Squalus albicaudus sp. nov. can be distinguished from its congeners by the following combination of characters: caudal fin with a mostly white ventral caudal lobe, dorsal caudal margin white at midline, and postventral caudal margins broadly white; pectoral-fin posterior margin broadly white; first dorsal fin with anterior margin also conspicuously white on its anterior half. Squalus albicaudus sp. nov. differs from all species of the S. mitsukurii group by: snout short vs. snout large; pectoral-fin free rear tips pointed vs. pectoral-fin free rear tips rounded; dermal denticles lanceolate and unicuspid vs. dermal denticles rhomboid and tricuspid. Squalusalbicaudus sp. nov. is clearly distinct from S. cubensis by: snout strongly pointed (vs. snout somewhat rounded); second dorsal-fin spine not reaching second dorsal-fin apex (vs. spine reaching second dorsal-fin apex); first dorsal fin with dark apex, but not as a black blotch (vs. conspicuous black blotch on both dorsal fins); pectoral fins with posterior margin broadly white (vs. narrowly white). These two species also differ in external morphometrics such as: shorter first dorsal fin (anterior margin length 10.9%, 9.7%–11.2% TL vs. 11.6%, 11.6%–12.7% TL in S. cubensis); shorter second dorsal fin (anterior margin length 9.2%, 8.8%–10.8% TL vs. 12.3%, 11.2%–11.6% TL in S. cubensis; inner margin length 5.0%, 4.1%–5.2% TL vs. 5.6%, 5.5%–6.0% TL in S. cubensis); more slender second dorsal-fin spine (width at base 0.9%, 0.6%–0.9% TL vs. 1.0%, 1.0%–1.2% TL in S. cubensis); and clasper much more elongated in (inner margin length 7.1%, 6.9%–7.7% TL vs. 8.0%, 3.3%–3.8% TL in S. cubensis).

Distribution
In warm tropical waters between the northeastern and southeastern Brazilian coast and is often registered between the states of Bahia and Espírito Santo. Its distribution to southern Brazil is unknown. [24274]

Size / Weight / Age
425 mm - 610 mm TL (types) [24274]

Habitat
marine [24274]

Dentition
Teeth unicuspid and similar in both jaws, wide and flattened labial-lingually at crown, imbricate laterally; upper teeth much smaller than lower teeth; cusp oblique, somewhat elongate and heavy, directed laterally; mesial heel slightly notched; distal heel rounded; mesial cutting edge somewhat straight; apron thick and rather elongate. Three series of teeth in upper jaw and two series of teeth in lower jaw in holotype (paratypes 2–3 series in both jaws); tooth rows ranging from 12–12 (13–14 paratypes) in upper jaw and 11–11 (11–12 paratypes) in lower jaw [24274]

Remarks
shark-references Species-ID=14606;