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Abstract:

The three larval instars of Hydaticus (Guignotites) tuyuensis Trémouilles are described and illustrated for the first time, emphasizing the morphometry and chaetotaxy. Second- and third-instar larvae of the known species of the subgenus Guignotites Brinck are characterized by a trilobate median process of prementum. All larval instars of H. tuyuensis, however, have a bilobate process, similar to that present in the known species of the subgenus Hydaticus Leach. This implies that a trilobate process cannot be used as a diagnostic character for Guignotites. Alternatively, Guignotites as presently defined may not represent a natural group. A cladistic analysis of 57 larval characters suggests that the genus Hydaticus shares a common origin with the clade composed of the genera Eretes Laporte and Thermonectus Dejean, based on the following synapomorphies: (i) abdominal segment VII almost completely sclerotized ventrally; the absence of (ii) additional ventroapical pores on the third antennomere, (iii) setae FE4 and FE6, (iv) additional setae on the femur and (v) additional setae on the tibia; and the presence of (vi) setae on the median process of prementum and (vii) spinulae on the second labial palpomere. A bilobate or trilobate median process of the prementum and the submedial insertion of seta AN3 distinguish Hydaticus from the remaining genera of Dytiscinae studied. © Springer 2006.

Registro:

Documento: Artículo
Título:Hydaticus tuyuensis Trémouilles (Coleoptera: Dytiscidae): Larval morphology and phylogenetic relationships within Dytiscinae
Autor:Michat, M.C.; Torres, P.L.M.
Filiación:Laboratorio de Entomología, Departamento de Biodiversidad Y Biología Experimental, Ciudad Universitaria, Av. Int. Güiraldes s/n, C1428EHA, Buenos Aires, Argentina
Palabras clave:Chaetotaxy; Hydaticini; Hydaticus; Larvae; Phylogeny; Biological organs; Biomass; Diagnosis; Ecology; Microbiology; Morphology; Chaetotaxy; Hydaticini; Hydaticus; Larvae; Phylogeny; Biodiversity; beetle; larva; morphology; phylogenetics; Coleoptera; Dytiscidae; Dytiscinae; Eretes; Hydaticini; Hydaticus; Thermonectus
Año:2006
Volumen:563
Número:1
Página de inicio:479
Página de fin:492
DOI: http://dx.doi.org/10.1007/s10750-006-0026-2
Título revista:Hydrobiologia
Título revista abreviado:Hydrobiologia
ISSN:00188158
CODEN:HYDRB
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00188158_v563_n1_p479_Michat

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Citas:

---------- APA ----------
Michat, M.C. & Torres, P.L.M. (2006) . Hydaticus tuyuensis Trémouilles (Coleoptera: Dytiscidae): Larval morphology and phylogenetic relationships within Dytiscinae. Hydrobiologia, 563(1), 479-492.
http://dx.doi.org/10.1007/s10750-006-0026-2
---------- CHICAGO ----------
Michat, M.C., Torres, P.L.M. "Hydaticus tuyuensis Trémouilles (Coleoptera: Dytiscidae): Larval morphology and phylogenetic relationships within Dytiscinae" . Hydrobiologia 563, no. 1 (2006) : 479-492.
http://dx.doi.org/10.1007/s10750-006-0026-2
---------- MLA ----------
Michat, M.C., Torres, P.L.M. "Hydaticus tuyuensis Trémouilles (Coleoptera: Dytiscidae): Larval morphology and phylogenetic relationships within Dytiscinae" . Hydrobiologia, vol. 563, no. 1, 2006, pp. 479-492.
http://dx.doi.org/10.1007/s10750-006-0026-2
---------- VANCOUVER ----------
Michat, M.C., Torres, P.L.M. Hydaticus tuyuensis Trémouilles (Coleoptera: Dytiscidae): Larval morphology and phylogenetic relationships within Dytiscinae. Hydrobiologia. 2006;563(1):479-492.
http://dx.doi.org/10.1007/s10750-006-0026-2