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Helobdella
''Helobdella'' is a genus of leeches in the family Glossiphoniidae, the freshwater jawless leeches. They occur worldwide.〔Kutschera, U., et al. (2013). (Description of a new leech species from North America, ''Helobdella austinensis'' n. sp.(Hirudinea: Glossiphoniidae), with observations on its feeding behaviour. ) ''Zoosyst Evol'' 89(2) 239-46.〕
These are small, flat leeches which do not feed on blood.〔Siddall, M. E. and E. Borda. (2003). (Phylogeny and revision of the leech genus ''Helobdella'' (Glossiphoniidae) based on mitochondrial gene sequences and morphological data and a special consideration of the ''triserialis'' complex. ) ''Zoologica Scripta'' 32(1), 23-33.〕
Several species in this genus are used as model organisms in the study of developmental biology.〔
It has been difficult to define species in this genus without DNA analysis. Like other leeches in this family, some ''Helobdella'' species are polymorphic, coming in different colors and patterns. On the other hand, some uniformly colored species are actually cryptic species complexes that may be divided into separate species with genetic analysis.〔
As of 2004 there were approximately 40 described species, with species being described and reclassified continually.〔Siddall, M. E. and E. Borda. (2004). (Leech collections from Chile including two new species of ''Helobdella'' (Annelida: Hirudinida). ) ''American Museum Novitates'' 1-18.〕
Species include:〔
*''Helobdella austinensis''〔
*''Helobdella chaquensis''
*''Helobdella cordobensis''
*''Helobdella cryptica''
*''Helobdella duplicata''
*''Helobdella elongata''
*''Helobdella europaea''
*''Helobdella longicollis''
*''Helobdella malvinensis''
*''Helobdella michaelseni''
*''Helobdella paranensis''
*''Helobdella pichipanan''
*''Helobdella obscura''
*''Helobdella robusta''
*''Helobdella similis''
*''Helobdella stagnalis''
*''Helobdella triserialis''
*''Helobdella virginiae''〔 Oceguera-Figueroa, A. (2007). (Especie nueva de sanguijuela del género Helobdella (Rhynchobdellida: Glossiphoniidae) del lago de Catemaco, Veracruz, México. ) ''Acta Zoológica Mexicana'' 23(1) 15-22.〕
*''Helobdella wodzickiorum''
*''Helobdella xenoica''
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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