ILPLA   05424
INSTITUTO DE LIMNOLOGIA "DR. RAUL A. RINGUELET"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
FIRST PHYLOGENETIC ANALYSIS OF THE GENUS ALOTANYPUS (DIPTERA: CHIRONOMIDAE: TANYPODINAE)
Autor/es:
SIRI AUGUSTO; DONATO MARIANO
Lugar:
La Plata
Reunión:
Congreso; IX Reunión Argentina de Cladística y Biogeografía; 2010
Resumen:
The Macropelopini genus Alotanypus is presently known by four species, A. venustus (Coquillett) and A. aris Roback from the Nearctic Region, A. dalyupensis (Freeman) from the Australian Region and A. kuroberobustus (Sasa and Okazawa) from the Palearctic Region. In the present analysis, we also included to A. vittigera (Edwards) from Patagonia, Argentina. This species was firstly described as Anatopynia vittigera, and we transfered to Alotanypus (unpublished data). In addition, we included one representative species of each of Macropelopini tribe, two of Pentaneurini and one species of Natarsini. Characters used for the analysis consist of 56 continuous characters and 48 discrete ones. Characters of male and female adults, as well as characters of pupa and larva were included in the analysis. A data set with all quantitative characters standardized and expressed as ranges together with discrete characters coded as non-additive were analyzed with the program TNT version 1.1 under maximum parsimony using equal and implied weights. Analyses with implied weighting were conducted by means of values for the concavity constant k= 5-16. All tree searches were performed using a Wagner tree as starting tree and 1000 random addition sequences plus TBR with 100 trees to save per replication, followed by TBR branch swapping. The results obtained in this analysis were estimated as absolute and GC (Group present/Contradicted) frequencies with 1000 replicates of jackkinfe symmetrical resampling plus TBR (jackknife symmetric resampling is not affected by weighted characters), 10 random addition sequences, and saving 100 trees per replicate. Results of the analysis show Guassutanypus oliveirai as the sister group the genus Alotanypus. The clade including all Alotanypus species has a high support, sharing the antennal ratio, leg ratio III, wing length, absence of posnotals, presence of tibial comb I and spatullated or pointed claws on male adults; L / W of thoracic horn, relative possition of lateral seta 1 on abdominal s.VII and VIII of pupa; cephalic index on larva. Alotanypus vittigera is closely related with A. kuroberobustus, and the clade is highly supported. The clade [A. aris-A. vittigera-A. kuroberobustus] as well as the clade [A. dalyupensis-A. aris-A. vittigera-A. kuroberobustus] have a low support.