Squaliolus laticaudus

Smith & Radcliffe, 1912

Spined pygmy shark
Classification: Elasmobranchii Squaliformes Dalatiidae

Reference of the original description
Smith, H.M. (1912)
The squaloid sharks of the Philippine Archipelago, with descriptions of new genera and species. Proceedings of the United States National Museum, 41, 677–685

Image of the original description

Squaliolus laticaudus Smith & Radcliffe, 1912

Synonyms / new combinations and misspellings
Euprotomicrus laticaudus, Euprotomicrus sarmenti, Squaliolus sarmenti

Squaliolus laticaudus
Holotype: USNM: 70259; Paratype: USNM: 76679;
Squaliolus sarmenti
Holotype: FMNH: 58862;

Description :

Citation: Squaliolus laticaudus Smith & Radcliffe, 1912: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 07/2024

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Squaliolus laticaudus Smith & Radcliffe, 1912, © NOOA www.photolib.noaa.gov/
Common names
deu \(T\) Zwerghai, spa Tollo pigmeo espinudo, fra \(T\) Squale nain, eng Dwarf shark, eng Spined pigmy shark, eng Spined pygmy shark, por Cação-espinho, por Tubarão-anão

Short Description
The spined pygmy shark Squaliolus laticaudus is a very small dogfish (about 25cm) with a large eye (diameter 73-86% of interorbital width), upper margin nearly straight; upper lip without papillae [544] [1388]. Color: dark with conspicuously light-margined fins [518] . Edge of fins with bright border (Ref. 43998). S. laticaudus is the type species of the genus which has the following distinctive features: fin spine on its first dorsal fin but not on its second dorsal fin; second dorsal fin long-based and low, about twice the length of first dorsal fin base; first dorsal-fin base closer to pectoral fins than to pelvic fins; and caudal fin nearly symmetrical, paddle-shaped, with subterminal notch present; low lateral keels on caudal peduncle . Body cigar-shaped; snout very long, bulbously conical but slightly pointed; mouth ventral; lips thin; teeth strongly different in both jaws, uppers small, narrow and erect cusps, lowers larger, blade-like and semi erect. Tooth rows 22-23/16-21. [518] [1388].

Nearly circumtropical. Western Atlantic: off Bermuda, southern Brazil, and northern Argentina. Eastern Atlantic: off France and Madeira. Western Indian Ocean: off Somalia. Western Pacific: Japan, Taiwan and Philippines [3749], as well as Australia (Ref. 7300). Source: www.gbif.org

Human uses
fisheries: of no interest

Probably ovoviviparous. Twelve mature eggs have been found in a single ovary of a mature female but this does not imply that large litters are produced [518]. Distinct pairing with embrace [17086]. An oceanic, wide-ranging, tropical pelagic species occurring near continental and insular land masses, sometimes over the shelves, but usually over the slopes . Displays vertical migrations on a diel cycle, seen at the bottom during the day and travels to 200 m at night. Feeds on deepwater squid, lanternfish, gonostomatids and idiacanthids, and probably follows its prey on their diel migrations.

Size / Weight / Age
22.0 cm TL (male/unsexed; [518]); 25 cm TL (female)

bathypelagic; oceanodromous [17660]; marine; depth range 200 - 1200 m [17657]

tooth formula (upper/lower): 10-11/9 [1131];

Links: SEM-images of teeth

shark-references Species-ID=6677;