The order Notostraca (colloquially referred to as notostracans, called Triops, tadpole shrimp or shield shrimp) are small crustaceans in the class Branchiopoda. Triops have three internal compound eyes and a flattened carapace covering the head and leg-bearing segments of the body. The order contains a single family, with only two extant genera. Their external morphology has apparently not changed since the Triassic appearance of Triops cancriformis around 220 million years ago. Triops cancriformis may therefore be the "oldest living animal species on earth" Kelber, K.-P. (1999). Triops cancriformis (Crustacea, Notostraca): Ein bemerkenswertes Fossil aus der Trias Mitteleuropas. — In: Hauschke, N. & Wilde, V. (eds.): Trias - Eine ganz andere Welt, III.16: 383-394. Verl. Dr. F. Pfeil, Munich..
Notostracans sometimes even cannibalise freshly moulted members of the same species. In northern and central Europe, with few exceptions, all tadpole shrimps are female, whereas the sexes in southern and western Europe as well as in northern Africa are nearly equal in number. These "females" possess hermaphroditic glands, but instead of selfing, parthenogenesis takes place. Modified appendages of the 11th pair of limbs bear the ovisacs with the mature eggs.
More on [ Notostraca ]

Triops - Information about the various species of triops in the wild and as pets, including effects on the environment and natural history.
Triops Information Page - Natural history and care of the tadpole shrimp, living fossils of the genus Triops.
MyTriops - Articles on the physiology, natural history, and care of triops, and galleries of high-resolution, larger-than life photos.
Meta Description: [ All you need to know about Triops and how to care and look after them. Triops are also called tadpole shrimp, shield shrimp, dinosaur shrimp. ]
Netfysh: Triops - Commercial site with rearing information, FAQ, photographs, and video clips.
Meta Description: [ The Netfysh Internet Shopping Educational and Fun UK Mail Order ]
Our Triops - Personal page with photographs and descriptions.
Shield Shrimp - Information about the triops and Lepidura species found in Australia.
Steve's Triops Diary - Includes day by day notes, photographs, and video clips.
Meta Description: [ Steve's Triops Diary ]
Tadpole Shrimp: US Parks and Wildlife Department - Article about the vernal tadpole shrimp discussing its life cycle, habitat, and status as an endangered species.
The Amazing World of Triops - Features facts and some short videos of triops.
The Story of the Tadpole Shrimp - Includes photographs, facts, and a personal story.
The Triops Project 2000 - Personal page with a triops growth diary, and rearing tips.
Triops - Personal page with photographs and rearing tips.
Meta Description: [ Triops ]
Triops WebRing - Sites in the webring are in English, German, and Dutch.
Meta Description: [ Bringing together the Triops on the Web. ]
Triops, Inc. - Commercial site with lesson plans for educators, FAQ, and instructions for rearing the creatures.
Meta Description: [ Educational toys! ]
Triops.cc - Commercial site that includes a FAQ, forum, and scientific articles.
Meta Description: [ Triops Triops Triops ... Triops.cc ist seit über 10 Jahren die erste Adresse für Triops-Freunde weltweit. Informationen über TRIOPS und andere Urzeitkrebse gibt es auch auf www.urzeitkrebse.at ]
Yahoo! Groups : triopsforever - Discussion group.
Meta Description: [ triopsforever: Triops Forever - Triop Lovers Unite! ]
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