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 Spined pygmy shark (Squaliolus laticaudus)

  Index
> Photo
> Range Map
> Systematics
> Name
> Appearance
> Coloration
> Distribution
> Biology
> Feeding
> Size
> Reproduction
> Similar Species
> Endangerment
> Danger to Humans

 Photo

Spined pygmy shark
©
 Range Map

Earth Map


 Systematics

Phylum: Vertebates (Chordata)

Class: Carlilagenous Fishes (Chondrichthyes)
  Order: Dogfish sharks (Squaliformes)
    Family: Dogfish sharks (Squalidae)
      Genus: Squaliolus (Squaliolus)


 Name

Scientific: Squaliolus laticaudus
German: Zwerghai
English: Spined pygmy shark
French: Squale nain
Spanish: Tollo pigmeo espinudo


 Appearance

Very small, spindle shaped body. Pointed, long and bulbously shaped snout. The only known shark with a spine on its first dorsal fin but not on the second one. First dorsal fin with its origin opposite to the inner margins or rear tips of pectoral fins. No anal fin.

 Coloration

Dark (black) with conspicuously light-margined fins.

 Distribution

Oceanic and nearly circumtropical. Western Atlantic: Bermuda, southern Brazil, northern Argentina. Eastern Atlantic: France and Madeira. Indian Ocean: Somalia. Western Pacific: Japan, Taiwan, Philippines.

 Biology

This species lives over the continental slopes, between 200 m and 500 m depth. It is known to vertically migrate. Spined pygmy sharks have photophores that produces bioluminescent light on the undersides of their bodies. ( A few are also located on their backs. These photophores are also used for "counter shading", making them less visible against the ligher background (i.e.the surface and surface light) from below and therefore more protected from predators.

 Feeding

Cephalopods, lanternfishes and other fishes of deeper water.

 Size

Probably the smallest shark of all, maximum size about 25 cm.

 Reproduction

Aplacental viviparous (ovoviviparous). Males reach sexual maturity at about 15 cm, females at about 17 cm to 20 cm.

 Similar Species

None.

 Endangerment

Status in the IUCN Red List:


No Entry found in Red List.


 Danger to Humans

Harmless.



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