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Eremidrilus n. gen. (Annelida, Clitellata, Lumbriculidae) and new species from California, U.S.A.

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A new Nearctic lumbriculid genus, Eremidrilus, includes four new California species (E. elegans, E. coyote, E. ritocsi, and E. felini) plus the new combination of Trichodrilus allegheniensis Cook, 1971 from the eastern U.S.A. Eremidrilus has the Trichodrilus arrangement of reproductive organs, but is distinguished by a filiform proboscis and male pores on folded porophores. A combination of other characters distinguishes most Eremidrilus species from most Trichodrilus species: (i) elongate-tubular thin-walled atria, (ii) posterior vasa deferentia forming a loop in XI, (iii) no posterior blood vessels, (iv) nephridia not present in VII. Spermathecae restricted to the first postatrial segment and laterally displaced spermathecal pores differentiate the western Eremidrilus species from the single eastern species.

Le nouveau genre néarctique de lumbriculidés, Eremidrilus, comprend quatre nouvelles espèces californiennes (E. elegans, E. coyote, E. ritocsi et E. felini) et la nouvelle combinaison de Trichodrilus allegheniensis Cook, 1971 de l'est des États-Unis. Eremidrilus a le même arrangement d'organes reproducteurs que Trichodrilus, mais s'en distingue par son proboscis filiforme et par les pores mâles sur les porophores repliés. La combinaison des caractères additionnels suivants permet de distinguer la plupart des espèces d'Eremidrilus de la plupart des Trichodrilus : (i) les atriums tubulaires allongés à parois minces, (ii) les canaux déférents postérieurs qui forment une boucle dans le segment XI, (iii) l'absence de vaisseaux sanguins postérieurs et (iv) l'absence de néphridies dans le segment VII. Les spermathèques confinées au premier segment post-atrial et les pores des spermathèques qui occupent une position plus latérale distinguent les espèces d'Eremidrilus de l'ouest de l'unique espèce de l'est. [Traduit par la Rédaction]

Document Type: Research Article

Publication date: March 1, 2003

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