Idiosepius pygmaeus

Idiosepius pygmaeus
Hatchlings of Idiosepius pygmaeus (ca. 2 mm long) stained with phosphotungstic acid (left) and Lugol's iodine (right)
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Sepiolida
Family: Idiosepiidae
Genus: Idiosepius
Species: I. pygmaeus
Binomial name
Idiosepius pygmaeus
Steenstrup, 1881
Synonyms
  • Idiosepius pygmaeus hebereri
    Grimpe, 1931

Idiosepius pygmaeus, also known as the Two-toned Pygmy Squid, is a species of bobtail squid native to the Indo-Pacific. It occurs in waters of the South China Sea, Japan, Philippines, Palau, Indonesia, Northern Mariana Islands, as well as northern and northeastern Australia. It inhabits shallow, inshore waters.[1][2]

I. pygmaeus weighs 0.00033 g upon hatching and increases in weight to 0.175 g as it reaches maturity in 50 days (1260 degree days). It inhabits waters at a temperature of 25.2°C. Growth rate has been calculated as 12.55 and physiological growth rate as 0.498.[3]

I. pygmaeus grows to 20 mm in mantle length.[1]

This species has been reared on a diet of glass shrimp (Acetes sibogae australis) in the laboratory.[4]

The type specimen was collected in the South China Sea (04°20′N 107°20′E / 4.333°N 107.333°E / 4.333; 107.333) and is deposited at the Zoologisk Museum of Kobenhavns Universitet in Copenhagen.[5]

References

  1. 1 2 Reid, A. 2005. Family Idiosepiidae. In: P. Jereb & C.F.E. Roper, eds. Cephalopods of the world. An annotated and illustrated catalogue of species known to date. Volume 1. Chambered nautiluses and sepioids (Nautilidae, Sepiidae, Sepiolidae, Sepiadariidae, Idiosepiidae and Spirulidae). FAO Species Catalogue for Fishery Purposes. No. 4, Vol. 1. Rome, FAO. pp. 208–210.
  2. ↑ Countries' Exclusive Economic Zones with Idiosepius pygmaeus
  3. ↑ Wood, J.B. & R.K. O'Dor 2000. "Do larger cephalopods live longer? Effects of temperature and phylogeny on interspecific comparisons of age and size at maturity." (PDF). (134 KiB) Marine Biology 136(1): 91–99.
  4. ↑ Jackson, G.D. 1988. The Use of Statolith Microstructures to Analyze Life-history Events in the Small Tropical Cephalopod Idiosepius pygmaeus. Fishery Bulletin (U.S.) 87: 265-272.
  5. ↑ Current Classification of Recent Cephalopoda

Further reading

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