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| Krapp-Schickel, T.; Koenemann, S.. |
| The amphipod family Stenothoidae contains more than 200 species in about 40 genera; these genera are at present often defined not by the presence, but by the absence of synapomorphies, thus defining grades rather than clades. Our phylogenetic analyses yielded 4 groups of stenothoids: a basic proboloidid clade; an advanced and always clearly separated Austral-Antarctic thaumatelsonid clade, with a possibly related Arctic mesometopid clade; and finally a poorly resolved group, the stenothoids sensu stricto, including the large and probably polyphyletic genera Stenothoe and Metopa, each with more than 50 species. It is proposed to study and analyse these groups separately in future, based on better redescriptions of the individual species. Our analyses... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Taxonomy; Amphipoda; Stenothoidae; Thaumatelsonidae; Phylogenetic analysis; 42.74. |
| Ano: 2006 |
URL: http://www.repository.naturalis.nl/record/214545 |
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| Knopf, F.; Koenemann, S.; Schram, F.R.; Wolff, C.. |
| We have examined the caudal regions of diverse peracarid and pancarid malacostracans using light and scanning electronic microscopy. The traditional view of malacostracan posterior anatomy is not sustainable, viz., that the free telson, when present, bears the anus near the base. The anus either can occupy a terminal, sub-terminal, or mid-ventral position on the telson; or can be located on the sixth pleomere – even when a free telson is present. Furthermore, there is information that might be interpreted to suggest that in some cases a telson can be absent. Embryologic data indicates that the condition of the body terminus in amphipods cannot be easily characterized, though there does appear to be at least a transient seventh segment that seems to fuse... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Anus; Pancarida; Peracarida; Pleomeres; Proctodaeum; Teloblasts; Telson; Urosome; 42.74. |
| Ano: 2006 |
URL: http://www.repository.naturalis.nl/record/210767 |
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