Triops australiensis explained

Triops australiensis, sometimes referred to as a shield shrimp,^[1] is an Australian species of the tadpole shrimp Triops.

Distribution

Triops australiensis has a wide distribution across Australia, excluding the northernmost parts of Western Australia, and Queensland.^[2] It is also absent from Tasmania in the south, where it is replaced by Lepidurus apus.^[3] The two species can be distinguished by the presence of a supra-anal plate between the caudal rami at the end of the abdomen in L. apus, which is lacking in T. australiensis.^[4]

Biology

T. australiensis inhabits temporary pools of water in the arid regions of the Australian outback. When desiccated pools fill with water, the resting eggs hatch into nauplii, and rapidly develop to adulthood. Reproduction succeeds within a few weeks of hatching.^[5] Adults achieve a maximum size of around 3inches, which is considered large for a tadpole shrimp.

Water chemistry

Triops australiensis can tolerate a pH of 7–9, and can live in both hard and soft water, but the eggs of T. australiensis are more likely to hatch in water with a low mineral content.

Notes and References

1. Web site: Shield Shrimp . Queensland Museum . 2010–2013 . 2013-06-13.
2. Michael J. Tyler . Margaret Davies . Graeme F. Watson . David J. Williams . amp . 1996 . Significant extension in northern Australia of the known geographic range of the Shield Shrimp Triops australiensis (Crustacea: Notostraca) . . 318 . 3 . 135–137 . 10.1007/BF00016675. 33070845 .
3. W. D. Williams . 1968 . The distribution of Triops and Lepidurus (Branchiopoda) in Australia . . 14 . 2 . 119–126 . 10.1163/156854068X00476 . dead . https://web.archive.org/web/20100921224806/http://www.triops.es/articulos/paper2.pdf . 2010-09-21 .
4. Book: William David Williams . 1980 . Australian freshwater life: the invertebrates of Australian inland waters . 2nd . . 978-0-333-29894-7 . Arachnids and Crustaceans . 118–184 . https://books.google.com/books?id=2qqrV5WaJ4sC&pg=PA129.
5. Book: Donald Thomas Anderson . 1996 . Atlas of Invertebrate Anatomy . . 978-0-86840-207-9 . Phylum Crustacea . 26–28 . https://books.google.com/books?id=lZaXdYuN8IIC&pg=PA26.