''Idiosepius pygmaeus'', also known as the two-toned pygmy squid, Tropical Pygmy squid, is a species of

bobtail squid Bobtail squid (order Sepiolida) are a group of cephalopods closely related to cuttlefish. Bobtail squid tend to have a rounder mantle than cuttlefish and have no cuttlebone. They have eight suckered arms and two tentacles and are generally qui ...

native to the Indo-Pacific. It occurs in waters of the

South China Sea The South China Sea is a marginal sea of the Western Pacific Ocean. It is bounded in the north by the shores of South China (hence the name), in the west by the Indochinese Peninsula, in the east by the islands of Taiwan and northwestern Phi ...

, Japan,

Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...

Palau Palau,, officially the Republic of Palau and historically ''Belau'', ''Palaos'' or ''Pelew'', is an island country and microstate in the western Pacific. The nation has approximately 340 islands and connects the western chain of the ...

Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guine ...

Northern Mariana Islands The Northern Mariana Islands, officially the Commonwealth of the Northern Mariana Islands (CNMI; ch, Sankattan Siha Na Islas Mariånas; cal, Commonwealth Téél Falúw kka Efáng llól Marianas), is an unincorporated territory and commonw ...

, 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. ''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. ''I. pygmaeus'' grows to 20 mm in mantle length. This species has been reared on a diet of

glass shrimp ''Palaemon'' is a genus of caridean shrimp of the family Palaemonidae. The conventional circumscription of the genus ''Palaemon'' is probably paraphyletic. Molecular data suggest that ''Palaemonetes'', as well as the genera ''Exopalaemon'' and '' ...

(''

Acetes sibogae australis ''Acetes'' is a genus of small shrimp that resemble krill, which is native to the western and central Indo-Pacific, the Atlantic coast of the Americas, Pacific coast of South America and inland waters of South America. Although most are from mar ...

'') 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 In biology, a type is a particular specimen (or in some cases a group of specimens) of an organism to which the scientific name of that organism is formally attached. In other words, a type is an example that serves to anchor or centralizes th ...

was collected in the

() and is deposited at the

Zoologisk Museum The Copenhagen Zoological Museum ( Danish: ''Zoologisk Museum'') is a part of the Natural History Museum of Denmark, which is affiliated with the University of Copenhagen. History The Zoological Museum It is among the world's oldest natural his ...

Kobenhavns Universitet The University of Copenhagen ( da, Københavns Universitet, KU) is a prestigious public research university in Copenhagen, Denmark. Founded in 1479, the University of Copenhagen is the second-oldest university in Scandinavia after Uppsala Unive ...

Copenhagen Copenhagen ( or .; da, København ) is the capital and most populous city of Denmark, with a proper population of around 815.000 in the last quarter of 2022; and some 1.370,000 in the urban area; and the wider Copenhagen metropolitan ar ...

.Current Classification of Recent Cephalopoda
/ref>

References

External links

Latitude and Longitude Data for ''Idiosepius pygmaeus''

GenBank Links for Genetic Information on ''Idiosepius pygmaeus''
* Bobtail squid Cephalopods described in 1881 {{sepiolida-stub

References

Further reading

External links