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Descriptions of larvae of the North American endemic stygobiontic Ereboporus naturaconservatus Miller, Gibson & Alarie and Haideoporus texanus Young & Longley (Coleoptera: Dytiscidae)

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The larvae of the North American stygobiontic dytiscid species Ereboporus naturaconservatus Miller, Gibson & Alarie, 2009 and Haideoporus texanus Young & Longley, 1976 are described with an emphasis on chaetotaxy of the head capsule, head appendages, legs, last abdominal segment and urogomphi. Both of these species share the presence of a nasale and the absence of the primary pores MXd and LAc, which have been recognized as synapomorphies for members of the subfamily Hydroporinae. Out of the common convergent characteristics associated with hypogaeic living, no synapomorphies were found that could relate Haideoporus texanus and Ereboporus naturaconservatus, which reinforces the hypothesis that these species evolved independently within the subfamily Hydroporinae. In terms of morphological adaptations, E. naturaconservatus stands as a remarkable hydroporine in that its larvae evolved a truncated last abdominal segment and a very elongate urogomphomere 1 relative to urogomphomere 2.

Affiliations: 1: Department of Biology, Laurentian University, Ramsey Lake Road, Sudbury, ON, Canada P3E 2C6. ; 2: National Fish Hatchery and Technology Center, U.S. Fish and Wildlife Service, 500 East McCarty Lane, San Marcos, TX 78666, USA. ; 3: Department of Biology and Museum of Southwestern Biology, University of New Mexico, Albuquerque, NM 87131, USA.


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