Two-toned Pygmy Squid

Taxobox
name = Two-toned Pygmy Squid


image_caption =
regnum = Animalia
phylum = Mollusca
classis = Cephalopoda
ordo = Sepiolida
familia = Idiosepiidae
genus = "Idiosepius"
species = "I. pygmaeus"
binomial = "Idiosepius pygmaeus"
binomial_authority = Steenstrup, 1881
synonyms =
*"Idiosepius pygmaeus hebereri"
Grimpe, 1931

The Two-toned Pygmy Squid ("Idiosepius pygmaeus") 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.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.] [ [http://www.cephbase.utmb.edu/biogeo/eez.cfm?CephID=180 Countries' Exclusive Economic Zones with "Idiosepius pygmaeus"] ]

"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 25.2ºC. Growth rate has been calculated as 12.55 and physiological growth rate as 0.498. [Wood, J.B. & R.K. O'Dor 2000. PDFlink| [http://www.cephbase.utmb.edu/refdb/pdf/6374.pdf Do larger cephalopods live longer? Effects of temperature and phylogeny on interspecific comparisons of age and size at maturity.] |134 KiB "Marine Biology" 136(1): 91–99.]

"I. pygmaeus" grows to 20 mm in mantle length.

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

The type specimen was collected in the South China Sea (coord|04|20|N|107|20|E|scale:250000) and is deposited at the Zoologisk Museum of Kobenhavns Universitet in Copenhagen. [http://www.mnh.si.edu/cephs/newclass.pdf Current Classification of Recent Cephalopoda] ]

References

Further reading

*Jackson, G.D. 1989. The use of statolith microstructures to analyze life-history events in the small tropical cephalopod "Idiosepius pygmaeus". "Fishery Bulletin" 87: 265-272.
*Jackson, G.D. 1992. Seasonal variation in reproductive investment in the tropical Loliginid squid "Loligo chinensis" and the small tropical Sepioid "Idiosepius pygmaeus". "Fishery Bulletin" 91: 260-270.
*Jackson, G.D. 1992. Seasonal abundance of the small tropical Sepioid "Idiosepius pygmaeus" (Cephalopoda: Idiosepiidae) at two localities off Townsville, north Queensland Australia. "The Veliger" 35(4): 396-401.
*Moynihan, M. 1983. Notes on the behavior of "Idiosepius pygmaeus" (Cephalopoda; Idiosepiidae). "Behaviour" 85: 42-57.
*Sasaki, M. 1923. On an adhering habit of a pygmy cuttlefish, "Idiosepius pygmaeus" Steenstrup. "Annotationes Zoolodicae Japanenses" 10(21): 209-213.

External links

* [http://www.cephbase.utmb.edu/biogeo/latlong.cfm?CephID=180 Latitude and Longitude Data for "Idiosepius pygmaeus"]
* [http://www.cephbase.utmb.edu/spdb/genlinks.cfm?CephID=180 GenBank Links for Genetic Information on "Idiosepius pygmaeus"]