The position of the Arthropoda in the phylogenetic system
- A. Schmidt-Rhaesa, T. Bartolomaeus, C. Lemburg, U. Ehlers, J. Garey
- BiologyJournal of morphology
- 1 December 1998
There are morphological characters that support Articulata, but molecular as well as morphological data advocate Ecdysozoa, and comparative morphology suggests Gastrotricha as the sister group of Ecdy sozoa with the synapomorphies.
Comments on a phylogenetic system of the Platyhelminthes
- U. Ehlers
- BiologyHydrobiologia
- 2004
A phylogenetic system of the Platyhelminthes is presented and several hypothesized autapomorphies of the well-known main subordinated monophyla of free-living and parasitic platyhelminths are named.
The syndermatan phylogeny and the evolution of acanthocephalan endoparasitism as inferred from 18S rDNA sequences.
- H. Herlyn, O. Piskurek, J. Schmitz, U. Ehlers, H. Zischler
- BiologyMolecular Phylogenetics and Evolution
- 2003
Ultrastructure and function of the pharynx of Gnathostomula paradoxa (Gnathostomulida)
The monophyly of the Gnathostomulida and Gnathifera is supported, supported by the finding that extended non-contractile regions of both pharyngeal and body wall musculature form the so-called parenchymatous tissue between the digestive tract and the body wall.
Comparative morphology of statocysts in the Plathelminthes and the Xenoturbellida
- U. Ehlers
- BiologyHydrobiologia
- 1 December 1991
It is concluded that the different types of statocysts have evolved independently within the Plathelminthes.
Ultrastructure of the subepidermal musculature of Xenoturbella bocki, the adelphotaxon of the Bilateria
- U. Ehlers, B. Sopott-Ehlers
- BiologyZoomorphology
- 25 June 1997
Xenoturbella bocki is hypothesized to be the sister taxon of the Bilateria, the high-ranked taxon Xenoturbellida that lives on marine mud bottoms at a depth of 20–120 m and moves extremely slowly by ciliary gliding.
Embryonic development of the nervous system of the rhabdocoel flatworm Mesostoma lingua (Abildgaard, 1789)
- A. Younossi‐Hartenstein, U. Ehlers, V. Hartenstein
- BiologyThe Journal of comparative neurology
- 24 January 2000
An antibody against acetylated beta‐tubulin (anti‐acTub) that labels neurotubules reveals an invariant pattern of pioneer neurons in the brain of midstage embryos, which pioneer several commissural tracts of the brain and two pairs of ventral and dorsal connectives.
The embryonic development of the rhabdocoel flatworm Mesostoma lingua (Abildgaard, 1789)
- V. Hartenstein, U. Ehlers
- BiologyDevelopment, Genes and Evolution
- 18 August 2000
A series of stages defined by easily recognizable morphological criteria are introduced, including the apparent absence of gastrulation and the formation of the epithelial junctional complex of the Mesostoma embryogenesis in comparison to other animal phyla.
Organisation of the praesoma in Acanthocephalus anguillae (Acanthocephala, Palaeacanthocephala) with special reference to the muscular system
Abstract The organisation of the praesoma in the parasite Acanthocephalus anguillae was studied on the light and electron microscopic level, with emphasis on the morphology of the musculature. The…
Frontal glandular and sensory structures inNemertoderma (Nemertodermatida) andParatomella (Acoela): ultrastructure and phylogenetic implications for the monophyly of the Euplathelminthes…
- U. Ehlers
- BiologyZoomorphology
- 1 December 1992
In both species, a frontal gland complex with an accumulation of different body wall glands and of ciliated sensory receptors exists at the anterior tip of a specimen, substantiating the hypotheses of a homology of the frontal glandular structures in the Acoelomorpha and the Rhabditophora and of the monophyly of the taxon Euplathelminthes.
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