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vittigera, and we transfered to Alotanypus (unpublished data).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.