![]() Most attention is devoted to the elmids, which are represented by the greatest numbers of both species and individuals. Some aquatic biologists restrict the term "riffle beetles" to members of the family Elmidae, or even to the subfamily Elminae, but in this review I also include the riffle-dwelling members of the family Dryopidae, the genus Lutrochus (Lutrochidae, formerly in the family Limnichidae), and the water penny beetles (family Psephenidae sensu lato). Most are also quite small, about the size of household ants, although giants among them exceed the dimensions of a housefly. Most of them are slow in their movements and cling tenaciously to the substrate. Unlike the familiar and conspicuous water beetles such as dytiscids, gyrinids, and hydrophilids, riffle beetles do not swim and do not come to the surface for air. No formal designation has been proposed for the use of this common name, but many of us have unofficially adopted the term "riffle beetles" for the aquatic dryopoid beetles that typically occur in flowing streams, especially in the shallow riffles or rapids. What are riffle beetles? This question is not new to me, nor is it unexpected, even when it comes from an entomologist. Annual Review of Entomology Annual Reviews larvae and adults demonstrated resistance to drought by their presence in shaded disconnected pools without surface flow for over a month. Most of them are slow in their movements and cling tenaciously to the substrate. Larvae and pupae of caddisflies Mariliaspp., Oecetisspp., Helicopsychespp., and riffle beetle Microcylloepusspp. Larvae and adult elmid beetles were collected. No formal designation has been proposed for the use of this common name, but many of us have unofficially adopted the term "riffle beetles" for the aquatic dryopoid beetles that typically occur in flowing streams, especially in the shallow riffles or rapids. Abstract: We present new data on rare riffle beetle findings (Coleoptera: Elmidae) from the Balkan Peninsula. These lands and waters are currently within the boundaries of Scott State Park.Biology of Riffle Beetles Biology of Riffle Beetles DESIGNATED CRITICAL HABITATSĪs defined by Kansas Administrative Regulations, critical habitats include those areas documented as currently supporting self-sustaining population(s) of any threatened or endangered species of wildlife as well as those areas determined by the Kansas Department of Wildlife, Parks and Tourism to be essential for the conservation of any threatened or endangered species of wildlife.Ĭurrently, the following areas are designated critical for Optioservus Riffle Beetles:Īll springs and spring-fed streams that lie within Section 13, T16S, R33W, Scott County. Department personnel can then advise the project sponsor on permit requirements. Any time an eligible project is proposed that will impact the species' preferred habitats within its probable range, the project sponsor must contact the Ecological Services Section, Kansas Department of Wildlife, Parks and Tourism, 512 SE 25th Ave., Pratt, Kansas 67124-8174. Optioservus Riffle Beetles are protected by the Kansas Nongame and Endangered Species Conservation Act and administrative regulations applicable thereto. SPECIES PROTECTION AND CRITICAL HABITATS:
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