| Fossil oligochaetes are much rarer, and there are almost no fossil hirudineans known. |
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| The oligochaetes include earthworms and a group of related, mostly freshwater, species of annelids. |
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| The littoral zone was dominated by oligochaetes, gastropods, sphaerid clams, and chironomid larvae. |
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| Limited support for hirudineans and oligochaetes, the Clitellata, within polychaetes was also found. |
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| We thought that leeches were one group and their sister group with the oligochaetes, earthworms and a variety of other aquatic annelids. |
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| For example, bacterial endosymbionts as found in the giant vent Pogonophora are also present in many meiofaunal oligochaetes, nematodes and flatworms. |
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| Only oligochaetes were more abundant in the sediments than in Limnoperna druses. |
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| Smith and Hendry studied oligochaetes and aphanoneurans in Lake Louise in 1989 using multi-plate samplers suspended above the bottom of the lake. |
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| Bivalves were in Big and Marijilda Canyon creeks, and oligochaetes were only in Moonshine, Wet Canyon, and Lower Grant creeks. |
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| The burrowing activities of oligochaetes can often prevent tubicolous polychaetes from becoming established in a particular habitat. |
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| However, other types of organisms can be commonly found in the water, such as crustaceans, oligochaetes, mollusks, and arachnids. |
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| With almost 200 described species, including more than 160 endemics, the center of diversity for aquatic freshwater oligochaetes is Lake Baikal. |
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| Lawrence estuary had large numbers of nematodes and oligochaetes within their stomachs, which would indicate that these habitats are feeding areas. |
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| It would be important to evaluate the amplification rate of these four OTUs when oligochaete communities change and when other taxocenoses than oligochaetes are present. |
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