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Cellular morphology of leg musculature in the water bear Hypsibius exemplaris (Tardigrada) unravels serial homologies
(2019-10-16)
Tardigrades (water bears) are microscopic, segmented ecdysozoans with four pairs of legs. Lobopodous limbs that are similar to those seen in tardigrades are hypothesized to represent the ancestral state of Panarthropoda (Tardigrada + Onychophora + Arthropoda), and their evolutionary history is important to our understanding of ecdysozoan evolution. Equally important is our understanding of the functional morphology of these legs, which requires knowledge of their musculature. Tardigrade musculature is well documented ...
Aufsatz
Evidence for cell turnover as the mechanism responsible for the transport of embryos towards the vagina in viviparous onychophorans (velvet worms)
(2019-06-07)
Background
Onychophorans, commonly known as velvet worms, display a remarkable diversity of reproductive strategies including oviparity, and placentotrophic, lecithotrophic, matrotrophic or combined lecithotrophic/matrotrophic viviparity. In the placentotrophic species, the embryos of consecutive developmental stages are attached to the uterus via a placental stalk, suggesting they might be transported passively towards the vagina due to proximal growth and distal degeneration of tissue. However, this assumption has ...
Aufsatz
Der „Sekundenkleber“ der Stummelfüßer
(2019-12-05)
Der biologische Sekundenkleber der Stummelfüßer ist eine Quelle der Inspiration für die nachhaltige Produktion „intelligenter“ polymerbasierter Materialien. In der Natur jagen die Stummelfüßer ihre Beute mit dem proteinreichen Sekret, welches in der Lage ist, enorm belastbare Fasern zu bilden. Die Anleitung für diese Transformation ist in den Bausteinen programmiert und läuft selbstständig ohne jegliche Regulation durch den tierischen Körper ab. Elektrostatische Wechselwirkungen zwischen geladenen Proteinarealen und ...