Squaliolus laticaudus, Spined pygmy shark

Squaliolus laticaudus Smith & Radcliffe, 1912

Spined pygmy shark
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Native range | All suitable habitat | Point map | Year 2100
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Squaliolus laticaudus   AquaMaps   Data sources: GBIF OBIS
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Image of Squaliolus laticaudus (Spined pygmy shark)
Squaliolus laticaudus
Picture by Fischer, L.G.

Classificação / Names Nomes comuns | Sinônimos | Catalog of Fishes(Gênero, Espécies) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (tubarões e raias) (sharks and rays) > Squaliformes (Sleeper and dogfish sharks) > Dalatiidae (Sleeper sharks)
Etymology: Squaliolus: Latin, squalidus = pale, weak (Ref. 45335).  More on authors: Smith & Radcliffe.

Environment: milieu / climate zone / depth range / distribution range Ecologia

; marinhas batipelágico; oceanódromo (Ref. 51243); intervalo de profundidade 200 - 1200 m (Ref. 27000), usually - m (Ref. ).   Deep-water; 0°C - ; 48°N - 40°S, 180°W - 180°E

Distribuição Países | Áreas da FAO | Ecossistemas | Ocorrências | Point map | Introduções | Faunafri

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 (Ref. 13748), as well as Australia (Ref. 7300).

Comprimento de primeira maturação / Tamanho / Peso / Idade

Maturity: Lm ?, range 17 - 20 cm
Max length : 22.0 cm TL macho/indeterminado; (Ref. 247); 25.0 cm TL (female)

Descrição suscinta Morfologia | Morfometria

Espinhos dorsais (total): 1; Raios dorsais (total): 0; Espinhos anais 0; Raios anais : 0. 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 (Ref. 31367, 6871). Color: dark with conspicuously light-margined fins (Ref. 247) . 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. (Ref. 247, 6871).

Biologia     Glossário (p.ex. epibenthic)

An oceanic, wide-ranging, tropical pelagic species occurring near continental and insular land masses, sometimes over the shelves, but usually over the slopes (Ref. 247). Displays vertical migrations on a diel cycle, seen at the bottom during the day and travels to 200 m at night (Ref. 247). Feeds on deepwater squid, lanternfish, gonostomatids and idiacanthids, and probably follows its prey on their diel migrations (Ref. 247). Ovoviviparous (Ref. 205). Has well-developed photophores densely covering the ventral part of the body and sparsely seen on the sides and hardly developed on the dorsal surface (Ref. 247).

Ciclo de vida ou comportamento de acasalamento Maturidade | Reprodução | Desova | Ovos | Fecundidade | Larvas

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 (Ref. 247). Distinct pairing with embrace (Ref. 205).

Referência principal Upload your references | Referências | Coordenador : Compagno, Leonard J.V. | Colaboradores

Compagno, L.J.V., 1984. FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 1 - Hexanchiformes to Lamniformes. FAO Fish. Synop. 125(4/1):1-249. Rome, FAO. (Ref. 247)

Status na Lista Vermelha da UICN (Ref. 124695)

  Segura ou pouco preocupante (LC) ; Date assessed: 21 November 2019

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Ameaça para os humanos

  Harmless





Uso pelos humanos

Pescarias: sem interesse
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Estimates based on models

Preferred temperature (Ref. 115969): 7.1 - 14.6, mean 10 °C (based on 649 cells).
Índice de diversidade filogenética (Ref. 82805):  PD50 = 0.7520   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00372 (0.00141 - 0.00976), b=3.12 (2.89 - 3.35), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
Nível Trófico (Ref. 69278):  4.2   ±0.73 se; based on food items.
Resiliência (Ref. 120179):  Baixo, tempo mínimo de duplicação da população 4,5 - 14 anos (Fec assumed to be <10).
Vulnerabilidade (Ref. 59153):  Low vulnerability (13 of 100) .
Nutrients (Ref. 124155):  Calcium = 16.5 [2.8, 62.5] mg/100g ; Iron = 0.36 [0.09, 1.01] mg/100g ; Protein = 18.4 [16.5, 20.2] % ; Omega3 = 0.45 [0.16, 1.36] g/100g ; Selenium = 6.34 [1.55, 21.17] μg/100g ; VitaminA = 96.9 [20.1, 471.1] μg/100g ; Zinc = 0.497 [0.230, 1.302] mg/100g (wet weight);