Wolfgang Sterrer

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Triploblastic relationships were examined in the light of molecular and morphological evidence. Representatives for all triploblastic "phyla" (except Loricifera) were represented by both sources of phylogenetic data. The 18S ribosomal (rDNA) sequence data for 145 terminal taxa and 276 morphological characters coded for 36 supraspecific taxa were combined in(More)
BACKGROUND The question of how many marine species exist is important because it provides a metric for how much we do and do not know about life in the oceans. We have compiled the first register of the marine species of the world and used this baseline to estimate how many more species, partitioned among all major eukaryotic groups, may be discovered. (More)
Musculature and nervous system of Gnathostomula peregrina (Gnathostomulida, Scleroperalia) were reconstructed from whole animals by immunohistochemistry and confocal laser scanning microscopy. The F-actin muscular subset, stained with FITC-labeled phalloidin, consists of: (1) eleven pairs (four ventral, one ventrolateral, one dorsolateral, five dorsal) of(More)
The geographic distribution of the mesopsammobiont gastropod genusPseudovermis is reconsidered.P. papillifer andP. schulzi were found for the first time in the Northern Adriatic near Rovigno.P. kowalevskyi andP. boadeni are described. A taxonomic survey and a determination key are presented for allPseudovermis species known thus far. 1. Die Kenntnis der(More)
Marine catenulid platyhelminths of the genus Paracatenula lack mouth, pharynx and gut. They live in a symbiosis with intracellular bacteria which are restricted to the body region posterior to the brain. The symbiont-housing cells (bacteriocytes) collectively form the trophosome tissue, which functionally replaces the digestive tract. It constitutes the(More)
The interstitial environment of marine sandy bottoms is a nutrient-rich, sheltered habitat whilst at the same time also often a turbulent, space-limited, and ecologically challenging environment dominated by meiofauna. The interstitial fauna is one of the most diverse on earth and accommodates miniaturized representatives from many macrofaunal groups as(More)
In the theory of the origin of sex as vaccination, I propose that the eukaryote genome accreted from prokaryan symbiont genomes in numerous rounds of lateral gene transfer during which sex diverged from unilateral parasitic infection, as an increasingly ritualized, reciprocal vaccination against superinfection. Sex-as-syngamy (fusion sex) arose when(More)
The microscopic worm group Lobatocerebridae has been regarded a ‘problematicum’, with the systematic relationship being highly debated until a recent phylogenomic study placed them within annelids (Curr Biol 25: 2000-2006, 2015). To date, a morphological comparison with other spiralian taxa lacks detailed information on the nervous and muscular system,(More)
An analysis with SEM of the mouth parts of 16 species belonging to 10 genera of Gnathostomulida resulted in the following new characters and conclusions: 1) At least in the genus Haplognathia, jaw teeth that are visible by conventional light microscopy are composed of the same aggregated needle-like denticles that are found, often in large numbers, on the(More)
We describe two new species, Austrognathia glandifera and Austrognatharia orientis using observations on squeezed, live specimens as well as histological sections and transmission electron microscopy. The protonephridia of Austrognatharia orientis are composed of a terminal cell, a canal cell, and a nephroporus cell. The monociliated terminal cell(More)