Squalus acutirostris

CHU, MENG & LI, 1984


Shortspine spurdog
Classification: Elasmobranchii Squaliformes Squalidae

Reference of the original description
CHU, Y.-T. & MENG, Q.-W. & LI, S. (1984)
Description of a new species of Squalidae of China. Oceanologia et Limnologia Sinica, 15 (4): 283–286

Image of the original description
Image in copyright.

Types
Squalus acutirostris
Holotype: SCSFRI: D01562; Paratype: SFC: D01473 SFC: D01548 SFC: D01567


Description :


Citation: Squalus acutirostris CHU, MENG & LI, 1984: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 03/2021

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Squalus acutirostris (A–E): HUMZ 74990, juvenile female, 536 mm TL in lateral (A) and ventral (B) views; first (C) and second (D) dorsal fins and caudal fin (E). S. suckleyi in lateral view (F): HUMZ 90963, adult female, 784 mm TL. Scale bars: 50 mm (A, B, F); 20 mm (C–E) © Viana & de Carvalho (2020)
Common names
Shortspine spurdog

Short Description
Diagnosis after VIANA & DE CARVALHO, 2020 [28564]: Single values correspond to holotype first followed by a single paratype and a specimen from Japan between brackets. Squalus acutirostris is separated from its congeners by a combination of characters: large sized species (635–975 mm maximum TL in adults) with body moderately slender and fusiform (Fig. 6A), its greatest width at head (head width 1.4(1.4, 1.2) times trunk width and 1.3(1.1, 1.2) times abdomen width); head small, its length 24.4%(22.6%, 22.1%) TL; snout rounded at tip and short, preorbital length 8.2%(7.3%, 8.1%) TL; nostrils nearer to snout than to mouth (Fig. 6B); first dorsal fin oblique, wide at fin web and low, its height 6.0%(5.6%, 8.6%) TL; first dorsal fin concave at the lower half of posterior margin, not raked (Fig. 6C); second dorsal fin with raked posterior margin (Fig. 6D); dorsal-fin spines robust and short, never reaching the fin apex (first dorsal-fin spine length 2.8%(2.7%, 3.2%)TL; second dorsal-fin spine length 2.8%(1.9%, 4.8%) TL; pectoral fins moderately wide with posterior margin length 11.0%(10.3%, 10.1%) TL; pectoral-fin posterior margin concave, although not falcate; pectoral-fin free rear tips rounded; caudal fin rectangular with conspicuous caudal fork (Fig. 6E); caudal fin small with dorsal caudal margin length 0.7(0.9, 1.0) times head length; lower caudal lobe much shorter than upper caudal lobe (preventral caudal margin length 0.7(0.6, 0.5) times dorsal caudal margin length); body brownish-grey to dark grey dorsally and light brown ventrally; first and second dorsal-fin apex slightly black; conspicuous black upper caudal blotch and small black caudal bar; black basal marking conspicuous at the origin of caudal fin; lower caudal lobe mostly white.

Distribution
Western Pacific: South China Sea [785] and off New South Wales, Australia. Not contained in Compagno"quot;s (1999) Checklist [529].

Size / Weight / Age
60.7 cm TL (male/unsexed; [3755])

Habitat
bathydemersal; marine; depth range 394 - 394 m [3755]