Idiosepius pygmaeus

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Idiosepius pygmaeus
Idiosepius pygmaeus.png
Hatchlings of Idiosepius pygmaeus (ca. 2 mm long) stained with phosphotungstic acid (left) and Lugol's iodine (right)
Tropical Pygmy Squid (Idiosepius pygmaeus) (25377304317).jpg
Tropical Pigmy squid
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
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 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. [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). 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. [5]

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

This species has been reared on a diet of 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]

The Idiosepius pygmaeus is heavily concentrated in seagrass meadows. They are known to attach onto seagrass using a special organ that supports adhesion. However, due to environmental changes caused by human activities, seagrass meadows have been disturbed. This habitat used for shelter by organisms such as the Idiosepius are being threatened.

Related Research Articles

<i>Idiosepius</i> Genus of molluscs

Idiosepius is a genus of squids in the family Idiosepiidae. They are small, reaching mantle lengths of no more than about 21 mm (0.8 in); members of this genus represent no interest to commercial fisheries. They occur in tropical and temperate waters throughout the Indo-Pacific, primarily in association with seagrass and mangrove roots.

<i>Rossia glaucopis</i> Species of mollusc

Rossia glaucopis is a species of bobtail squid native to the southeastern Pacific Ocean, specifically the waters around Chile.

Sepiola steenstrupiana, also known as Steenstrup's bobtail, is a species of bobtail squid native to the Gulf of Aden in the Red Sea, waters off Somalia, and the Mediterranean Sea, including the central Tyrrhenian Sea, the Adriatic Sea, the Aegean Sea, and the Levantine Sea.

Euprymna hoylei is a species of bobtail squid native to the tropical waters of the Indo-Pacific, specifically the western Pacific Ocean and northwestern Australia. Little is known about the size range of this species.

<span class="mw-page-title-main">Idiosepiidae</span> Family of molluscs

Idiosepiidae, also known as the pygmy squids, is a family of squids in the superorder Decapodiformes. They are the smallest known squids.

Euprymna penares is a species of bobtail squid native to waters of the Indo-Pacific; its exact distribution is unknown. Little is known about the size range of this species.

Inioteuthis capensis is a species of bobtail squid native to the southeastern Atlantic Ocean, specifically from Lüderitz Bay to Mossel Bay off South Africa.

Inioteuthis japonica is a species of bobtail squid native to the western Pacific Ocean, specifically the waters off China, Taiwan, and southern Japan.

Rossia brachyura is a species of bobtail squid native to the tropical western Atlantic Ocean, specifically the Greater and Lesser Antilles.

Rossia bullisi, also known as the Gulf bobtail squid, is a species of bobtail squid native to the tropical western Atlantic Ocean, specifically the northern Gulf of Mexico and Straits of Florida.

Rossia moelleri is a species of bobtail squid native to the northern Atlantic Ocean and the Arctic Ocean, eastward to the Laptev Sea and westward to Amundsen Bay. It occurs off western and northeastern Greenland, northeastern Canada, Labrador, Spitsbergen, Jan Mayen, and in the Kara Sea. R. moelleri lives at depths from 17 to 250 m.

Heteroteuthis weberi is a species of bobtail squid native to the Indo-Pacific waters off central Indonesia.

Idiosepius minimus is a species of bobtail squid native to the "coast of Africa" where it occurs in shallow, inshore waters. Specimens collected under the junior synonyms I. biserialis and I. macrocheir were described from Mozambique. Since then, the further collecting effort off Mozambique has seen additional specimens gained. As a result it has been inferred that this species has a relatively restricted distribution since Idiosepius has not been recorded elsewhere in Africa.

Idiosepius picteti is a species of pygmy squid native to the Indo-Pacific waters off eastern Indonesia.

Idiosepius thailandicus, also known as the thai pygmy squid, is a species of bobtail squid native to the Indo-Pacific waters off Thailand. The extent of this species' distribution is still to be determined and records of Idiosepius dwarf squid away from Thailand, south to Indonesia and north to Japan, may be attributable to this species.

<i>Xipholeptos</i> Genus of molluscs

Xipholeptos is a genus of squid in the family Idiosepiidae. It is monotypic, being represented by the single species Xipholeptos notoides, commonly known as the southern pygmy squid. The species was originally classified as Idiosepius notoides. The southern pygmy squid is native to the southwestern Pacific Ocean, off southern and eastern Australia. It inhabits shallow, inshore waters. It has been recorded off the coasts of New South Wales, South Australia, Tasmania and Victoria.

<i>Idiosepius paradoxus</i> Species of mollusc

Idiosepius paradoxus, also known as the northern pygmy squid, is a species of pygmy squid native to the western Pacific Ocean. This species can be found inhabiting shallow, inshore waters around central China, South Korea, and Japan.

<i>Neorossia caroli</i> Species of mollusc

Neorossia caroli, the Carol bobtail squid, is a species of bobtail squid belonging to the family Sepiolidae.

<i>Sepiadarium austrinum</i> Species of cuttlefish

Sepiadarium austrinum, the southern bottletail squid, is a species of cuttlefish in the genus Sepiadarium. It was first described by S. Stillman Berry in 1921 based on a specimen found in St. Vincent Bay in South Australia.

<i>Austrorossia bipapillata</i> Species of squid

Austrorossia bipapillata, or the big-eyed bobtail squid, is a species of cuttlefish.

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 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

Further reading


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