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Post by sebbe67 on Jun 17, 2005 17:08:10 GMT
Hydropsyche tobiasi
was described in 1977 from specimens collected on the Rhine River, Germany in the 1920s. None have been seen since.
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Post by Melanie on Jun 19, 2005 16:09:56 GMT
German sources telling of last reports in 1938.
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Post by another specialist on Aug 8, 2005 14:03:15 GMT
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Post by Melanie on Jun 14, 2014 16:10:37 GMT
Scientific Name: Hydropsyche tobiasi Species Authority: Malicky, 1977 Common Name(s): English – Tobias' Caddisfly Assessment Information [top] Red List Category & Criteria: Extinct ver 3.1 Year Published: 2014 Date Assessed: 2013-10-03 Assessor(s): Malicky, H. Reviewer(s): Gerlach, J. Justification: This species occurred in an intensively studied part of the world and has not been recorded since 1938 despite searches for it in all recorded localities. Voucher specimens were only found in collections originating from the start of the 20th century and the last specimen was found on 4 August 1938. The Rhine and Main rivers were heavily polluted during the 20th century and almost all Trichoptera species became extinct there. Many caddis species have recovered since but Hydropsyche tobiasi was not found despite intensive searching in 1979 near Oppenheim, Wiesbaden-Schierstein, Ingelheim and in 2003-2004 near St. Goarshause und Kaub. The species was never found elsewhere and it was probably an endemic of the middle Rhine and Main rivers. It is therefore considered to be Extinct. The cause of extinction was probably the extensive river pollution in the Rhine and Main rivers in the early 20th century. History: 1996 – Extinct 1994 – Extinct (Groombridge 1994) Geographic Range [top] Range Description: This species was endemic to Germany and known only from eight sites along the Rhine and Main rivers (Assmannshausen, zwischen Biebrich und Assmannshausen 1906, Siegmundung 1908, Konigswinter 1909, Rudesheim 1913, Neuenahr 1914, Bonn 1914, near Klingenberg am Main 1938). It has not been recorded since 1938. Range Map: Click here to open the map viewer and explore range. Population [top] Population: No data are available as the species is extinct. Habitat and Ecology [top] Habitat and Ecology: Hydropsyches tobiasi was found only along the middle Rhine River and Main River, both of which are large rivers. Systems: Terrestrial; Freshwater Threats [top] Major Threat(s): The extinction of this species was probably caused by river pollution during the early 20th century. Conservation Actions [top] Conservation Actions: No conservation actions were taken specifically for this species but the Rhine River has been intensively managed and pollution controlled. However, this followed the extinction of Hydropsyche tobiasi. www.iucnredlist.org/details/biblio/10332/0 |
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