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Ultrastructure of the subepidermal musculature of Xenoturbella bocki, the adelphotaxon of the Bilateria
TLDR
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.
Functional aspects of the intercentriolar body in the spermiogenesis of Nematoplana coelogynoporoides (Plathelminthes, Proseriata)
SummaryThe intercentriolar body in the biciliary spermatids of Nematoplana coelogynoporoides and its changes during spermiogenesis are described. Different functional aspects of the body, for example
On the spermiogenesis of Invenusta aestus (Plathelminthes, Proseriata) an ultrastructural study with implications for plathelminth phylogeny
TLDR
The spermiogenesis of Invenusta aestus (Coelogynoporidae) is described based on electron microscopical observations and the importance of the organelles mentioned for discussion of phylogenetic relationships within the Plathelminthes is considered.
Comparative morphology of photoreceptors in free-living plathelminths — a survey
In free-living Plathelminthes, the best-known photoreceptors are pigment-cup ocelli, eyes formed of one or several pigmented supportive cells into whose cup-shaped cavity project the light-sensitive
Comparative morphology of photoreceptors in free-living plathelminths — a survey
In free-living Plathelminthes, the best-known photoreceptors are pigment-cup ocelli, eyes formed of one or several pigmented supportive cells into whose cup-shaped cavity project the light-sensitive
Electron microscopical observations on vitellocytes and germocytes inNematoplana coelogynoporoides (Plathelminthes, Proseriata)
SummaryFine-structural features of vitellaria and germaria inNematoplana coelogynoporoides are documented and compared with those of other free-living plathelminths with ectolecithal eggs. Emphasis
Photoreceptors in species of the Macrostomida (Plathelminthes): ultrastructural findings and phylogenetic implications
TLDR
The submicroscopic anatomy of intracerebral and pericerebral photoreceptors in six species of the Macrostomida is described and it is concluded that the characteristic ”two cup cells in rhabdomeric photoreCEPTors” has evolved in the stem lineage of the taxon Mac Frostomida or MacrostOMorpha, respectively.
Ultrastructural studies on vitellocytes of Parotoplaninae (Plathelminthes, Proseriata) with special reference to the structure of eggshell-forming granules
TLDR
In all parotoplanid species studied the eggshell granules show uniformly shaped substructures typical of all the Proseriata and besides this feature, globules exist which are bipartite, i.e. two different patterns exist within the same granule.
Ultrastructure of spermiogenesis and spermatozoa in Bradynectes sterreri and remarks on sperm cells in Haplopharynx rostratus and Paromalostomum fusculum: phylogenetic implications for the
TLDR
The two lateral ledges found in spermatozoa of B. sterreri are discussed to correspond to the pair of ’lateral bristles’ known from Macrostomum species, indicating a sister-group relationship of these two taxa.
A new type of photoreceptor in Anthopharynx sacculipenis (Plathelminthes, Solenopharyngidae)
The unpaired eye of A. sacculipenis consists of two sensory cells and one pigmented mantle cell. The light-sensing organelles are formed by flattened and rolled lamellae, which are not of ciliary
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