Meeting Abstract

33.9  Friday, Jan. 4  Phylogenetic relationships among the Dendrobranchiata based on morphological characters TAVARES, C.*; MARTIN, J.; Museu Nacional/UFRJ; Natural History Museum of Los Angeles County cr_tavares@hotmail.com

Dendrobranchiata comprises two superfamilies: Penaeoidea (Aristeidae, Benthesicymidae, Penaeidae, Sicyoniidae and Solenoceridae) and Sergestoidea (Luciferidae and Sergestidae). This work intends to do a phylogenetic analysis of Dendrobranchiata based on cladistic methodology. Twenty species of Dendrobranchiata were used as ingroup and 3 species of Caridea as outgroup. Matrix was prepared using the program Delta, with 92 morphological unordered characters. Programs Nona and Pee-Wee were used to search trees. Optimization of characters was done using program Winclada. Nona trees were searched using heuristic option. The method used was Branch Swapping (TBR swapping algorithm), and 75 trees were found (CI=0.51; RI=0.61; 287 steps). A strict consensus tree and a majority rule consensus tree were calculated. In both trees, Dendrobranchiata, Luciferidae, Sergestidae, Aristeidae, Sicyoniidae and Solenoceridae are monophyletic groups; Sergestoidea and Penaeidae are non-natural groups; Benthesicymidae is monophyletic in majority rule consensus and is polytomous in strict consensus. With Pee-wee one tree was found (CI=0.51; RI=0.60; 288 steps), with Dendrobranchiata, Luciferidae, Sergestidae, Aristeidae, Sicyoniidae and Solenoceridae as monophyletic groups and Sergestoidea, Benthesicymidae and Penaeidae as non-natural groups. The main topology differences among Nona and Pee-wee trees concern: the position of Benthesicymidae and the relationship among members of Penaeidae and Solenoceridae. In all options above the position of Luciferidae is ambiguous, because with its inclusion, Dendrobranchiata is defined by a series of simplesiomorphies (5 characters of a total of 8), and if the family is excluded from the suborder, Dendrobranchiata would be defined by 9 sinapomorphies.