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Montana Field Guide

Montana Field Guides

Bilobed Tadpole Shrimp - Lepidurus bilobatus

Native Species

Global Rank: G2G3
State Rank: SNR

Agency Status


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General Description
This species of tadpole shrimp (order Notostraca) is a member of the crustacean class Branchiopoda. Their large, hardened carapace (shell) makes them look like a fat tadpole swimming through the water or crawling along the bottom. They are important components of many freshwater and saline intermittent or temporary wetlands (Dodson and Frey 2001, Brendonk et al. 2008). These animals are especially common in seasonal wetlands, where populations are maintained by banks of resting eggs that may remain dormant and can survive drying periods of decades or longer (Brendonck 1996).

Observations in Montana Natural Heritage Program Database
Number of Observations: 2

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

  • Literature Cited AboveLegend:   View Online Publication
    • Brendonck, L, D.C Rogers, J Olesen, S Weeks, and W.R Hoeh. 2008. Global Diversity of Large Branchiopods (crustacea: Branchiopoda) in Freshwater. Hydrobiologia. 595.1 167-176.
    • Brendonck, L. 1996. Diapause, Quiescence, Hatching Requirements: What We Can Learn from Large Freshwater Branchiopods (crustacea: Branchiopoda: Anostraca, Notostraca, Conchostraca). Hydrobiologia: the International Journal of Aquatic Sciences. 320 p. 85-97
    • Dodson, S.I. and D.G. Frey. 2001. In: Thorp, V.H. and A.P. Covich. Ecology and classification of North American Freshwater Invertebrates. Academic Press, San Diego, CA.
  • Additional ReferencesLegend:   View Online Publication
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    • B.R. Hossack, R.L. Newell and D.C. Rogers. 2010. Branchiopods (Anostraca, Notostraca) from protected areas of western Montana. Northwest Science. 81(1): 52-57.
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Citation for data on this website:
Bilobed Tadpole Shrimp — Lepidurus bilobatus.  Montana Field Guide.  .  Retrieved on , from