. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 238 Katharina Händeler & Heike Wägele: Phyiogeny of Sacoglossa. Fig. 5. Sacoglossa; Neighbor network analysis applying SplitsTree4 to visualize conflict in the whole sacoglossan data set. Par- allel edges with same length indicate a split and visualize the distances between the two groups involved. Note the long edges bet- ween (he Plakobrancliacca and the Oxynoacea + Cyliiulrohulla. Fit value: 95,85. sal surface. Marcus du Bois-Rfymond (1980) and later Thompson
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 238 Katharina Händeler & Heike Wägele: Phyiogeny of Sacoglossa. Fig. 5. Sacoglossa; Neighbor network analysis applying SplitsTree4 to visualize conflict in the whole sacoglossan data set. Par- allel edges with same length indicate a split and visualize the distances between the two groups involved. Note the long edges bet- ween (he Plakobrancliacca and the Oxynoacea + Cyliiulrohulla. Fit value: 95,85. sal surface. Marcus du Bois-Rfymond (1980) and later Thompson and Jaklin (1988) positioned Boselliu in the family Plakobranchidae, but Marcus du Bois-Reymond (1982) transfened it in its own family Boselliidae based on the difference in number of chromosomes in Bosellia (n=7) and other sacoglossans (n=17), as well as the lack of parapodia. Jensen (1996) criticized that the number of chromosomes is only known for the species Bosellia miiuetica and not for other species of this genus but de- cided to retain the family status until the phylogenctic po- sition of the genus is solved. According to our results. Bosellia seems to represent an own evolutionaiy line, in- dependent of the family Plakobranchidae (with the gen- era Elysia, Thwidilla and Plakobranclnis), but its posi- tion varies within the Plakobranchacea. The result of the Maximum Likelihood analysis places Bosellia as sister- taxon of Plakobranchidae, similar to the results obtained by Jensen (1996). Bass and Karl (2006) used Bosellia miiuetica and Bosellia inareiisi in their phylogenctic analy- sis of Plakobranchidae. Similar to our results, B. miiuet- ica fonns the sister taxon to the further included genera Elysia, Elysiella, Plakobranclnis and Thwidilla. But the other included member of Bosellia, B. marcusi, represents the sistertaxon to Elysia timida. The authors considered a wrong detemiination of their animal. The family Plakobranchidae appears monophyletic only in the Ma
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