Descriptions of the preimaginal stages of Lancetes marginatus (Steinheil) and L. biremis Ríha (Coleoptera: Dytiscidae), and comparative notes with other Lancetes larvae

All the preimaginal stages of Lancetes marginatus (Steinheil) and third instar larva of L. biremis Říha are described and figured for the first time. Detailed analyses of the morphometry, chaetotaxy and porotaxy are provided, and comparisons with the immatures of other species of the genus are inclu...

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Autores principales: Michat, M.C., Archangelsky, M., Torres, P.L.M.
Formato: JOUR
Materias:
Argentina
Coleoptera
Dytiscidae
Lancetes
Larvae
Biremis
Dytiscinae
Insecta
Lancetes angusticollis
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01650521_v40_n2_p129_Michat
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_01650521_v40_n2_p129_Michat2023-10-03T15:02:47Z Descriptions of the preimaginal stages of Lancetes marginatus (Steinheil) and L. biremis Ríha (Coleoptera: Dytiscidae), and comparative notes with other Lancetes larvae Michat, M.C. Archangelsky, M. Torres, P.L.M. Argentina Coleoptera Dytiscidae Lancetes Larvae Biremis Coleoptera Dytiscidae Dytiscinae Insecta Lancetes Lancetes angusticollis All the preimaginal stages of Lancetes marginatus (Steinheil) and third instar larva of L. biremis Říha are described and figured for the first time. Detailed analyses of the morphometry, chaetotaxy and porotaxy are provided, and comparisons with the immatures of other species of the genus are included. The larvae described have multifragmented urogomphi, the only larval synapomorphy that defines the genus Lancetes Sharp. Third instars also present a secondary subdivision in some of the cephalic appendages, which is a synapomorphy of Lancetes plus Dytiscinae. First instar larva of L. marginatus is distinguished from the remaining known first instars of Lancetes by the absence of primary pores FRe and MXa, and the presence of one additional minute seta on the dorsal surface of antennomere 4 and one additional pore on the urogomphus. The third instar of L. marginatus is unique by the absence of secondary dorsal setae on the femur. The pupa of L. marginatus differs from that of L. angusticollis by the presence of fewer setae on the head, pronotum and abdominal terga V to VIII. © Taylor & Francis. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01650521_v40_n2_p129_Michat
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
Coleoptera
Dytiscidae
Lancetes
Larvae
Biremis
Coleoptera
Dytiscidae
Dytiscinae
Insecta
Lancetes
Lancetes angusticollis
spellingShingle Argentina
Coleoptera
Dytiscidae
Lancetes
Larvae
Biremis
Coleoptera
Dytiscidae
Dytiscinae
Insecta
Lancetes
Lancetes angusticollis
Michat, M.C.
Archangelsky, M.
Torres, P.L.M.
Descriptions of the preimaginal stages of Lancetes marginatus (Steinheil) and L. biremis Ríha (Coleoptera: Dytiscidae), and comparative notes with other Lancetes larvae
topic_facet Argentina
Coleoptera
Dytiscidae
Lancetes
Larvae
Biremis
Coleoptera
Dytiscidae
Dytiscinae
Insecta
Lancetes
Lancetes angusticollis
description All the preimaginal stages of Lancetes marginatus (Steinheil) and third instar larva of L. biremis Říha are described and figured for the first time. Detailed analyses of the morphometry, chaetotaxy and porotaxy are provided, and comparisons with the immatures of other species of the genus are included. The larvae described have multifragmented urogomphi, the only larval synapomorphy that defines the genus Lancetes Sharp. Third instars also present a secondary subdivision in some of the cephalic appendages, which is a synapomorphy of Lancetes plus Dytiscinae. First instar larva of L. marginatus is distinguished from the remaining known first instars of Lancetes by the absence of primary pores FRe and MXa, and the presence of one additional minute seta on the dorsal surface of antennomere 4 and one additional pore on the urogomphus. The third instar of L. marginatus is unique by the absence of secondary dorsal setae on the femur. The pupa of L. marginatus differs from that of L. angusticollis by the presence of fewer setae on the head, pronotum and abdominal terga V to VIII. © Taylor & Francis.
format JOUR
author Michat, M.C.
Archangelsky, M.
Torres, P.L.M.
author_facet Michat, M.C.
Archangelsky, M.
Torres, P.L.M.
author_sort Michat, M.C.
title Descriptions of the preimaginal stages of Lancetes marginatus (Steinheil) and L. biremis Ríha (Coleoptera: Dytiscidae), and comparative notes with other Lancetes larvae
title_short Descriptions of the preimaginal stages of Lancetes marginatus (Steinheil) and L. biremis Ríha (Coleoptera: Dytiscidae), and comparative notes with other Lancetes larvae
title_full Descriptions of the preimaginal stages of Lancetes marginatus (Steinheil) and L. biremis Ríha (Coleoptera: Dytiscidae), and comparative notes with other Lancetes larvae
title_fullStr Descriptions of the preimaginal stages of Lancetes marginatus (Steinheil) and L. biremis Ríha (Coleoptera: Dytiscidae), and comparative notes with other Lancetes larvae
title_full_unstemmed Descriptions of the preimaginal stages of Lancetes marginatus (Steinheil) and L. biremis Ríha (Coleoptera: Dytiscidae), and comparative notes with other Lancetes larvae
title_sort descriptions of the preimaginal stages of lancetes marginatus (steinheil) and l. biremis ríha (coleoptera: dytiscidae), and comparative notes with other lancetes larvae
url http://hdl.handle.net/20.500.12110/paper_01650521_v40_n2_p129_Michat
work_keys_str_mv AT michatmc descriptionsofthepreimaginalstagesoflancetesmarginatussteinheilandlbiremisrihacoleopteradytiscidaeandcomparativenoteswithotherlanceteslarvae
AT archangelskym descriptionsofthepreimaginalstagesoflancetesmarginatussteinheilandlbiremisrihacoleopteradytiscidaeandcomparativenoteswithotherlanceteslarvae
AT torresplm descriptionsofthepreimaginalstagesoflancetesmarginatussteinheilandlbiremisrihacoleopteradytiscidaeandcomparativenoteswithotherlanceteslarvae
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