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Lepidurus apus
''Lepidurus apus'', commonly known as tadpole shrimp and belongs to the family triopsidae, which are a lineage of shrimps that have been around in a similar form since the Triassic period and are considered living fossils, and are found in several countries spread throughout the world.
They have a long segmented abdomen with a carapace and large numbers of paddle like legs for movement. The species reproduces by a mixture of sexual reproduction and self-fertilisation of females.
==Description==
''Lepidurus apus'' are known to grow from 42mm-60mm in length and have a long multi segmented abdomen divided up into around 30 ring like sections, with two caudal filaments attached behind the last ring.They have a single pair of compound eyes, a flat carapace with an average length of 19mm that covers up to two thirds of the abdomen that is a mottled dark yellow/brown colour that transitions to a lighter edge. It wraps around most of its body attached only at the front, with its abdomen being multi-segmented with two long protruding tails. 〔(【引用サイトリンク】url=http://eol.org/pages/3209874/overview )〕 At the front of the abdomen are one or more (up to three) sets of feelers. On the bottom of the body are between 41-46 sets of paddle like limbs they use to swim with an average of 44 leg pairs.〔(【引用サイトリンク】url=http://www.landcareresearch.co.nz/resources/identification/animals/freshwater-invertebrates/guide/jointed-legs/crustaceans/others/tadpole-shrimps )〕 Males are readily identifiable by the lack of ovisacs found as well as subtle differences in it carapace. Females and hermaphrodites are virtually the same in appearance however the presence of testicular lobes in amongst the ovarian lobes in the hermaphrodites allows them to reproduce in isolation.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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