IADIZA   20886
INSTITUTO ARGENTINO DE INVESTIGACIONES DE LAS ZONAS ARIDAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
On the systematic position of Endeius Coiffait and Sáiz (Staphylinidae, Staphylininae)
Autor/es:
CHANI POSSE, M.
Lugar:
Stuttgart, germany
Reunión:
Congreso; 22nd Internacional Meeting on Biology and Systematics of Staphylinidae; 2007
Institución organizadora:
Staatliches Museum für Naturkunde Stuttgart (Germany)
Resumen:
The Austral South American genus Endeius Coiffait and Sáiz belongs to the Philonthina, a very speciose subtribe of Staphylinidae, particularly in the tropics where many genera have not been revised since their original description. Endeius, as it is currently known, comprises eight valid species distributed from Chile and Argentina through Juan Fernández Is. and Ga-lapagos Is.: E. nitidipennis (Solier), E. punctipennis (Solier), E. loensis Coiffait & Sáiz, E. subpunctipennis Coiffait & Sáiz, E. franzi Sáiz, E. lugubris Sáiz, E. multipunctatus Coiffait and E. ovaliceps Coiffait. Coiffait´s treatment of the Staphylininae relied heavily on the structures of male genita-lia, and affected the natural classification both at the generic and species level within the sub-family. The systematic position of Endeius was estimated by a cladistic analysis and its phy-logenetic relationships with other representatives within Philonthina were evaluated. Twenty terminal units were included in the cladistic analysis, the eight species of Endeius, and twelve outgroup taxa. Chosen outgroups to root the tree were one representative within Xanthopygi-na, one within Quediina and ten representatives within Philonthina: one in the genus Chroap-tomus Sharp, two in Gabrius Stephens, two in Bisnius Stephens, two in Belonuchus Nord-mann and three in Philonthus Stephens. Fifty-six characters were used, from which 35 were derived from the external morphology, 19 from male genitalia and two from female genitalia. Twenty-one multistate characters were treated as unordered (non-additive). Two search crite-ria were used: a) equally weighted analysis (EW), and b) implied weighting method (IW, Go-loboff 1993). Data matrix was analyzed with TNT (Goloboff 1999). The EW analysis of the data matrix produced one cladogram with 178 steps. Results from the IW analysis were congruent with those from the EW criteria. The cladogram shows the eight Endeius species as a non-monophyletic group. Its com-parison with a re-rooted tree supports this hypothesis. Endeius can be considered as a "natural group" only for four of its species including the type species, E. loensis. The group is defined by: second segment of maxillary palpus moderately to distinctly swollen, and more than five punctures at dorsal rows of pronotum. Endeius Coiffait and Sáiz belongs to the Philonthina, a very speciose subtribe of Staphylinidae, particularly in the tropics where many genera have not been revised since their original description. Endeius, as it is currently known, comprises eight valid species distributed from Chile and Argentina through Juan Fernández Is. and Ga-lapagos Is.: E. nitidipennis (Solier), E. punctipennis (Solier), E. loensis Coiffait & Sáiz, E. subpunctipennis Coiffait & Sáiz, E. franzi Sáiz, E. lugubris Sáiz, E. multipunctatus Coiffait and E. ovaliceps Coiffait. Coiffait´s treatment of the Staphylininae relied heavily on the structures of male genita-lia, and affected the natural classification both at the generic and species level within the sub-family. The systematic position of Endeius was estimated by a cladistic analysis and its phy-logenetic relationships with other representatives within Philonthina were evaluated. Twenty terminal units were included in the cladistic analysis, the eight species of Endeius, and twelve outgroup taxa. Chosen outgroups to root the tree were one representative within Xanthopygi-na, one within Quediina and ten representatives within Philonthina: one in the genus Chroap-tomus Sharp, two in Gabrius Stephens, two in Bisnius Stephens, two in Belonuchus Nord-mann and three in Philonthus Stephens. Fifty-six characters were used, from which 35 were derived from the external morphology, 19 from male genitalia and two from female genitalia. Twenty-one multistate characters were treated as unordered (non-additive). Two search crite-ria were used: a) equally weighted analysis (EW), and b) implied weighting method (IW, Go-loboff 1993). Data matrix was analyzed with TNT (Goloboff 1999). The EW analysis of the data matrix produced one cladogram with 178 steps. Results from the IW analysis were congruent with those from the EW criteria. The cladogram shows the eight Endeius species as a non-monophyletic group. Its com-parison with a re-rooted tree supports this hypothesis. Endeius can be considered as a "natural group" only for four of its species including the type species, E. loensis. The group is defined by: second segment of maxillary palpus moderately to distinctly swollen, and more than five punctures at dorsal rows of pronotum. Endeius was estimated by a cladistic analysis and its phy-logenetic relationships with other representatives within Philonthina were evaluated. Twenty terminal units were included in the cladistic analysis, the eight species of Endeius, and twelve outgroup taxa. Chosen outgroups to root the tree were one representative within Xanthopygi-na, one within Quediina and ten representatives within Philonthina: one in the genus Chroap-tomus Sharp, two in Gabrius Stephens, two in Bisnius Stephens, two in Belonuchus Nord-mann and three in Philonthus Stephens. Fifty-six characters were used, from which 35 were derived from the external morphology, 19 from male genitalia and two from female genitalia. Twenty-one multistate characters were treated as unordered (non-additive). Two search crite-ria were used: a) equally weighted analysis (EW), and b) implied weighting method (IW, Go-loboff 1993). Data matrix was analyzed with TNT (Goloboff 1999). The EW analysis of the data matrix produced one cladogram with 178 steps. Results from the IW analysis were congruent with those from the EW criteria. The cladogram shows the eight Endeius species as a non-monophyletic group. Its com-parison with a re-rooted tree supports this hypothesis. Endeius can be considered as a "natural group" only for four of its species including the type species, E. loensis. The group is defined by: second segment of maxillary palpus moderately to distinctly swollen, and more than five punctures at dorsal rows of pronotum. Endeius species as a non-monophyletic group. Its com-parison with a re-rooted tree supports this hypothesis. Endeius can be considered as a "natural group" only for four of its species including the type species, E. loensis. The group is defined by: second segment of maxillary palpus moderately to distinctly swollen, and more than five punctures at dorsal rows of pronotum.