Idiosepius pygmaeus

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Idiosepius pygmaeus
Tropical Pygmy Squid (Idiosepius pygmaeus) (25377304317).jpg
Adult
Idiosepius pygmaeus.png
Hatchlings (c. 2 mm long) stained with phosphotungstic acid (left) and Lugol's iodine (right)
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Idiosepida
Family: Idiosepiidae
Genus: Idiosepius
Species:
I. pygmaeus
Binomial name
Idiosepius pygmaeus
Steenstrup, 1881 [2]

Idiosepius pygmaeus, also known as the two-toned pygmy squid or tropical pygmy squid, is a species of bobtail squid native to the Indo-Pacific. It resides in the South China Sea, Japan, Philippines, Palau, Indonesia, the Northern Mariana Islands, as well as northern and northeastern Australia. The squid traditionally inhabits shallow, inshore waters. [3] [4]

Contents

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). The squid prefers waters at a temperature of 25.2 °C. Growth rate has been calculated as 12.55 and physiological growth rate as 0.498. [5]

I. pygmaeus grows to a mantle length of 20 mm. [3]

This species eats glass shrimp ( Acetes sibogae australis) in the laboratory. [6]

The type specimen was collected in the South China Sea ( 04°20′N107°20′E / 4.333°N 107.333°E / 4.333; 107.333 ) and is deposited at the Zoologisk Museum of Kobenhavns Universitet in Copenhagen. [7]

Habitat

I. pygmaeus is heavily concentrated in seagrass meadows. They are known to attach to seagrass using a special organ that supports adhesion. However, human activities have disturbed seagrass meadows. This habitat used for shelter by organisms such as Idiosepius is threatened. [3] [8]

References

  1. ↑ Barratt, I.; Allcock, L. (2012). "Idiosepius pygmaeus". IUCN Red List of Threatened Species . 2012: e.T162604A926579. doi: 10.2305/IUCN.UK.2012-1.RLTS.T162604A926579.en . Retrieved 19 November 2021.
  2. ↑ "WoRMS - World Register of Marine Species - Idiosepius pygmaeus Steenstrup, 1881". www.marinespecies.org. Retrieved 2022-02-25.
  3. 1 2 3 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.
  4. ↑ "Countries' Exclusive Economic Zones with Idiosepius pygmaeus". Archived from the original on 2003-05-23. Retrieved 2007-02-26.
  5. ↑ 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). Archived from the original (PDF) on 2004-12-14. (134  KiB)Marine Biology136(1): 91–99.
  6. ↑ 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.
  7. ↑ Current Classification of Recent Cephalopoda
  8. ↑ "Countries' Exclusive Economic Zones with Idiosepius pygmaeus". Archived from the original on 2003-05-23. Retrieved 2007-02-26.

Further reading

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