Hydaticus tuyuensis Trémouilles (Coleoptera: Dytiscidae): Larval Morphology and Phylogenetic Relationships within Dytiscinae

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.

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Correspondence to Mariano C. Michat.

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Michat, M.C., Torres, P.L.M. Hydaticus tuyuensis Trémouilles (Coleoptera: Dytiscidae): Larval Morphology and Phylogenetic Relationships within Dytiscinae. Hydrobiologia 563, 479–492 (2006). https://doi.org/10.1007/s10750-006-0026-2

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Keywords

  • Hydaticini
  • Hydaticus
  • larvae
  • chaetotaxy
  • phylogeny