Descriptions of larvae of Megadytes (Coleoptera: Dytiscidae: Dytiscinae): The subgenera Trifurcitus and Megadytes s. str., ground plan of chaetotaxy of the genus and phylogenetic analysis
The three larval instars of Megadytes (M.) carcharias Griffini and M. (Trifurcitus) fallax (Aubé) are described and illustrated in detail for the first time, with an emphasis on morphometry and chaetotaxy of the cephalic capsule, head appendages, legs, last abdominal segment and urogomphi. The groun...
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todo:paper_12105759_v107_n3_p377_Michat2023-10-03T16:09:00Z Descriptions of larvae of Megadytes (Coleoptera: Dytiscidae: Dytiscinae): The subgenera Trifurcitus and Megadytes s. str., ground plan of chaetotaxy of the genus and phylogenetic analysis Michat, M.C. Chaetotaxy Cybistrini Diving beetles Dytiscidae Ground plan Larva Megadytes Phylogenetic relationships Trifurcitus beetle cladistics larva morphometry phylogenetics Carcharias Coleoptera Cybistrini Dytiscidae Dytiscinae Fallax Hydroporinae Hygrobiidae Megadytes The three larval instars of Megadytes (M.) carcharias Griffini and M. (Trifurcitus) fallax (Aubé) are described and illustrated in detail for the first time, with an emphasis on morphometry and chaetotaxy of the cephalic capsule, head appendages, legs, last abdominal segment and urogomphi. The ground plan of chaetotaxy of the genus Megadytes Sharp is described and illustrated based on three of the four recognised subgenera. First-instar larvae of Megadytes are characterised by the presence of a large number of additional sensilla on almost every part of the body. Primary chaetotaxy of the subgenera (Bifurcitus Brinck based on third instar) is very similar, with few differences including (1) shape of the setae on the anterior margin of the frontoclypeus; (2) presence or absence of a ring of multi-branched setae on distal third of mandible; and (3) number of setae on the urogomphus. A cladistic analysis of Dytiscidae, based on 169 larval characters and 34 taxa, indicates that: (1) Trifurcitus Brinck deserves generic status; (2) Cybistrini are not closely related to Hydroporinae; (3) the absence of a galea in Cybistrini is a secondary loss independent of that in Hydroporinae; (4) Cybistrini are well supported by many characters (including several aspects of first-instar chaetotaxy). © 2003 Institute of Entomology. Fil:Michat, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_12105759_v107_n3_p377_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 |
Chaetotaxy Cybistrini Diving beetles Dytiscidae Ground plan Larva Megadytes Phylogenetic relationships Trifurcitus beetle cladistics larva morphometry phylogenetics Carcharias Coleoptera Cybistrini Dytiscidae Dytiscinae Fallax Hydroporinae Hygrobiidae Megadytes |
| spellingShingle |
Chaetotaxy Cybistrini Diving beetles Dytiscidae Ground plan Larva Megadytes Phylogenetic relationships Trifurcitus beetle cladistics larva morphometry phylogenetics Carcharias Coleoptera Cybistrini Dytiscidae Dytiscinae Fallax Hydroporinae Hygrobiidae Megadytes Michat, M.C. Descriptions of larvae of Megadytes (Coleoptera: Dytiscidae: Dytiscinae): The subgenera Trifurcitus and Megadytes s. str., ground plan of chaetotaxy of the genus and phylogenetic analysis |
| topic_facet |
Chaetotaxy Cybistrini Diving beetles Dytiscidae Ground plan Larva Megadytes Phylogenetic relationships Trifurcitus beetle cladistics larva morphometry phylogenetics Carcharias Coleoptera Cybistrini Dytiscidae Dytiscinae Fallax Hydroporinae Hygrobiidae Megadytes |
| description |
The three larval instars of Megadytes (M.) carcharias Griffini and M. (Trifurcitus) fallax (Aubé) are described and illustrated in detail for the first time, with an emphasis on morphometry and chaetotaxy of the cephalic capsule, head appendages, legs, last abdominal segment and urogomphi. The ground plan of chaetotaxy of the genus Megadytes Sharp is described and illustrated based on three of the four recognised subgenera. First-instar larvae of Megadytes are characterised by the presence of a large number of additional sensilla on almost every part of the body. Primary chaetotaxy of the subgenera (Bifurcitus Brinck based on third instar) is very similar, with few differences including (1) shape of the setae on the anterior margin of the frontoclypeus; (2) presence or absence of a ring of multi-branched setae on distal third of mandible; and (3) number of setae on the urogomphus. A cladistic analysis of Dytiscidae, based on 169 larval characters and 34 taxa, indicates that: (1) Trifurcitus Brinck deserves generic status; (2) Cybistrini are not closely related to Hydroporinae; (3) the absence of a galea in Cybistrini is a secondary loss independent of that in Hydroporinae; (4) Cybistrini are well supported by many characters (including several aspects of first-instar chaetotaxy). © 2003 Institute of Entomology. |
| format |
JOUR |
| author |
Michat, M.C. |
| author_facet |
Michat, M.C. |
| author_sort |
Michat, M.C. |
| title |
Descriptions of larvae of Megadytes (Coleoptera: Dytiscidae: Dytiscinae): The subgenera Trifurcitus and Megadytes s. str., ground plan of chaetotaxy of the genus and phylogenetic analysis |
| title_short |
Descriptions of larvae of Megadytes (Coleoptera: Dytiscidae: Dytiscinae): The subgenera Trifurcitus and Megadytes s. str., ground plan of chaetotaxy of the genus and phylogenetic analysis |
| title_full |
Descriptions of larvae of Megadytes (Coleoptera: Dytiscidae: Dytiscinae): The subgenera Trifurcitus and Megadytes s. str., ground plan of chaetotaxy of the genus and phylogenetic analysis |
| title_fullStr |
Descriptions of larvae of Megadytes (Coleoptera: Dytiscidae: Dytiscinae): The subgenera Trifurcitus and Megadytes s. str., ground plan of chaetotaxy of the genus and phylogenetic analysis |
| title_full_unstemmed |
Descriptions of larvae of Megadytes (Coleoptera: Dytiscidae: Dytiscinae): The subgenera Trifurcitus and Megadytes s. str., ground plan of chaetotaxy of the genus and phylogenetic analysis |
| title_sort |
descriptions of larvae of megadytes (coleoptera: dytiscidae: dytiscinae): the subgenera trifurcitus and megadytes s. str., ground plan of chaetotaxy of the genus and phylogenetic analysis |
| url |
http://hdl.handle.net/20.500.12110/paper_12105759_v107_n3_p377_Michat |
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AT michatmc descriptionsoflarvaeofmegadytescoleopteradytiscidaedytiscinaethesubgeneratrifurcitusandmegadytessstrgroundplanofchaetotaxyofthegenusandphylogeneticanalysis |
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1807318907077263360 |