Larval morphology of Paroster Sharp, 1882 (Coleoptera: Dytiscidae: Hydroporinae): Reinforcement of the hypothesis of monophyletic origin and discussion of phenotypic accommodation to a hypogaeic environment

The larvae of 13 species (six epigaeic and seven hypogaeic) of the Australian endemic genus Paroster Sharp, 1882 are described with an emphasis on chaetotaxy of the head capsule, head appendages, legs, last abdominal segment and urogomphi. A cladistic analysis of 41 Hydroporinae species and 63 infor...

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Autor principal: Michat, Mariano C.
Publicado: 2009
Materias:
Dytiscidae
Hydroporini
Larval chaetotaxy
Paroster
Sstygobitic
Coleoptera
Hydroporinae
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11755326_v_n2274_p1_Alarie
http://hdl.handle.net/20.500.12110/paper_11755326_v_n2274_p1_Alarie
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_11755326_v_n2274_p1_Alarie2023-06-08T16:09:45Z Larval morphology of Paroster Sharp, 1882 (Coleoptera: Dytiscidae: Hydroporinae): Reinforcement of the hypothesis of monophyletic origin and discussion of phenotypic accommodation to a hypogaeic environment Michat, Mariano C. Dytiscidae Hydroporini Larval chaetotaxy Paroster Sstygobitic Coleoptera Dytiscidae Hydroporinae Hydroporini Paroster The larvae of 13 species (six epigaeic and seven hypogaeic) of the Australian endemic genus Paroster Sharp, 1882 are described with an emphasis on chaetotaxy of the head capsule, head appendages, legs, last abdominal segment and urogomphi. A cladistic analysis of 41 Hydroporinae species and 63 informative characters supports a monophyletic origin of members of Paroster, which share a labial palpus comprised of three palpomeres and the absence of the primary seta FE7. Contrary to their epigaeic counterparts, larvae of hypogaeic Paroster species have turned out to be very divergent morphologically. In addition to the common characteristics associated with hypogaeic living (i.e., absence of eye, reduced pigmentation, and thin or soft exoskeleton), larvae of these species have undergone a relative elongation/ enlargement of the head capsule and a more elongate and narrower mandible and have developed a variable number of secondary temporal spines. Compared to the other stygobitic species studied, larvae of Paroster hinzeae (Watts & Humphreys, 2001), P. macrosturtensis (Watts & Humphreys, 2006), P. stegastos (Watts & Humphreys, 2003) and P. darlotensis (Watts & Humphreys, 2003) evolved a disproportionately large head capsule relative to body size. Larvae of P. wedgeensis (Watts & Humphreys, 2003) and P. mesosturtensis (Watts & Humphreys, 2006) are deemed to have deviated the least from the hypothetical epigaeic Paroster groundplan. © 2009 Magnolia Press. Fil:Michat, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11755326_v_n2274_p1_Alarie http://hdl.handle.net/20.500.12110/paper_11755326_v_n2274_p1_Alarie
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Dytiscidae
Hydroporini
Larval chaetotaxy
Paroster
Sstygobitic
Coleoptera
Dytiscidae
Hydroporinae
Hydroporini
Paroster
spellingShingle Dytiscidae
Hydroporini
Larval chaetotaxy
Paroster
Sstygobitic
Coleoptera
Dytiscidae
Hydroporinae
Hydroporini
Paroster
Michat, Mariano C.
Larval morphology of Paroster Sharp, 1882 (Coleoptera: Dytiscidae: Hydroporinae): Reinforcement of the hypothesis of monophyletic origin and discussion of phenotypic accommodation to a hypogaeic environment
topic_facet Dytiscidae
Hydroporini
Larval chaetotaxy
Paroster
Sstygobitic
Coleoptera
Dytiscidae
Hydroporinae
Hydroporini
Paroster
description The larvae of 13 species (six epigaeic and seven hypogaeic) of the Australian endemic genus Paroster Sharp, 1882 are described with an emphasis on chaetotaxy of the head capsule, head appendages, legs, last abdominal segment and urogomphi. A cladistic analysis of 41 Hydroporinae species and 63 informative characters supports a monophyletic origin of members of Paroster, which share a labial palpus comprised of three palpomeres and the absence of the primary seta FE7. Contrary to their epigaeic counterparts, larvae of hypogaeic Paroster species have turned out to be very divergent morphologically. In addition to the common characteristics associated with hypogaeic living (i.e., absence of eye, reduced pigmentation, and thin or soft exoskeleton), larvae of these species have undergone a relative elongation/ enlargement of the head capsule and a more elongate and narrower mandible and have developed a variable number of secondary temporal spines. Compared to the other stygobitic species studied, larvae of Paroster hinzeae (Watts & Humphreys, 2001), P. macrosturtensis (Watts & Humphreys, 2006), P. stegastos (Watts & Humphreys, 2003) and P. darlotensis (Watts & Humphreys, 2003) evolved a disproportionately large head capsule relative to body size. Larvae of P. wedgeensis (Watts & Humphreys, 2003) and P. mesosturtensis (Watts & Humphreys, 2006) are deemed to have deviated the least from the hypothetical epigaeic Paroster groundplan. © 2009 Magnolia Press.
author Michat, Mariano C.
author_facet Michat, Mariano C.
author_sort Michat, Mariano C.
title Larval morphology of Paroster Sharp, 1882 (Coleoptera: Dytiscidae: Hydroporinae): Reinforcement of the hypothesis of monophyletic origin and discussion of phenotypic accommodation to a hypogaeic environment
title_short Larval morphology of Paroster Sharp, 1882 (Coleoptera: Dytiscidae: Hydroporinae): Reinforcement of the hypothesis of monophyletic origin and discussion of phenotypic accommodation to a hypogaeic environment
title_full Larval morphology of Paroster Sharp, 1882 (Coleoptera: Dytiscidae: Hydroporinae): Reinforcement of the hypothesis of monophyletic origin and discussion of phenotypic accommodation to a hypogaeic environment
title_fullStr Larval morphology of Paroster Sharp, 1882 (Coleoptera: Dytiscidae: Hydroporinae): Reinforcement of the hypothesis of monophyletic origin and discussion of phenotypic accommodation to a hypogaeic environment
title_full_unstemmed Larval morphology of Paroster Sharp, 1882 (Coleoptera: Dytiscidae: Hydroporinae): Reinforcement of the hypothesis of monophyletic origin and discussion of phenotypic accommodation to a hypogaeic environment
title_sort larval morphology of paroster sharp, 1882 (coleoptera: dytiscidae: hydroporinae): reinforcement of the hypothesis of monophyletic origin and discussion of phenotypic accommodation to a hypogaeic environment
publishDate 2009
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11755326_v_n2274_p1_Alarie
http://hdl.handle.net/20.500.12110/paper_11755326_v_n2274_p1_Alarie
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