Showing papers in "Arthropod Structure & Development in 2002"

TL;DR: The present account describes immunocytochemical and neuroanatomical observations that reveal common design principles amongst midline neuropils in four arthropod clades, the hexapods, crustaceans, chilopods, and chelicerates and the absence of midline neuroscience in diplopods and suggests that the 'Myriapoda' are an artificial paraphyletic group.

TL;DR: Body size, rather than species-specific ecological adaptation, is the major (97%) determinant of the number of ommatidia per eye in diurnal, as well as nocturnal foragers.

TL;DR: No clear functional distinction between the two morphological types of sensilla was found, although the few cells that responded specifically to non-host volatiles were associated with sensilla basiconica II.

TL;DR: The morphological specializations in the DRA of the locUST eye most likely maximize the polarization sensitivity and suggest that the locust uses this eye region for analysis of the sky polarization pattern.

TL;DR: The results indicate that the shape of the developing larval brain in A. salina closely resembles that in malacostracan embryos and the organization of the central complex as well as the tritocerebral innervation pattern of the labrum is homologous in this species and in Malacstraca.

TL;DR: The independent organization of sperm storage organs, spermathecal ducts, associated musculature, gland cells, and innervation offer possible mechanisms by which sperm movement may be influenced by females.

TL;DR: External and internal features of minute reared ex ovo larvae of Ptinella tenella Erichson with the head widths ranging from 108 to 138mum are described and the monophyly of a ptiliid subgroup which does not comprise Nossidium is suggested.

TL;DR: Morphological, ultrastructural and immunocytochemical studies of adult female antennae were conducted by scanning and transmission electron microscopy, showing a strong labeling in olfactory sensilla, specifically in the sensillum lymph surrounding the dendritic branches of SW-WP sensilla and in the uninnervated lumen between the two concentric walls of DW-WP type 1 sensilla.

TL;DR: Molecular evidence (repo) suggests the labrum is not only appendicular but also articulated, comprising two jointed elements homologous to the coxa and trochanter of the leg.

TL;DR: The ossicles of the cardiac and pyloric foregut of three species of decapods are described and illustrated in detail, providing new additional evidence for brachyuran monophyly and the paraphyletic status of the podotrematan crabs.

TL;DR: The results extend the cell lineage of S. ingentis from the egg to the nauplius larva, and demonstrate that endoderm forms dorsal to teloblastic mesoderm from an early stage.

TL;DR: An overview of the endoskeletal structures of the head and trunk in the different arthropod groups: Chelicerata, Crustacea, Myriapoda and Hexapoda is proposed and may be considered as a first step to use morphological characteristics of theendoskeleton in future cladistic analyses to assess the phylogeny of arthropods.

TL;DR: Morphological innovations are described for flower visiting insects that are crucial for the production of a long proboscis such as the formation of a closed, air-tight food tube, specializations in the apical intake region, modification of the basal articulation of the glossa, and novel means of retraction, extension and storage of the elongated parts.

TL;DR: The general arrangement of leg motoneurons in the central nervous system and motoneuron anatomy conforms to the situation in pterygote insects and decapod crustaceans.

TL;DR: The comparison with the respiratory system of the jumping spider Salticus scenicus reveals that the lungs have very similar mass-specific D(O2) in both species, and that, in addition, jumping spiders possess a much better developed tracheal system.

TL;DR: Successive intracellular muscle fiber recordings from antagonists, and correlation of the monitored inhibitory postsynaptic potentials with spikes in motor nerves, suggest supply of the scorpion leg musculature by common inhibitory motoneurons.

TL;DR: The Malpighian tubules of workers of the fire ant Solenopsis saevissima (Myrmicinae) were analyzed by scanning and transmission electron microscopy in order to determine their functional organization and association with the hindgut epithelium.

TL;DR: Ultrastructure and motility pattern of spermatozoa of the rove beetle Aleochara curtula were examined using electron and light microscopic methods to study the effect of the mitochondrial derivatives on sperm motility.

TL;DR: The phase-dependent morphology of the surface structure and the cuticular layers of the alloscutum are described qualitatively and quantitatively and the presence of systematic deposits of resilin in the allOScutum, which are significant for the flexibility, is demonstrated.

TL;DR: It is concluded that the secondary headspot cells are neurons which direct axonal processes into the developing optic tract and so contribute to the primary axon scaffold of the brain and do not represent a segmental border in the brain.

TL;DR: In these cells different evolutionary trends are shown in the structure of the cuticular apparatus, particularly in the number, size and position of the Cuticular apertures as well as in the length and abundance of epicuticular filaments.

TL;DR: The fine structure of male sex pheromone disseminating structures on abdominal segments of five species of Lutzomyia sandflies was analyzed and it was shown that in L. cruzi and L. longipalpis pupae, the structures are located in pale spots on abdominal tergites and appear as small round cuticular elevations with a central pore.

TL;DR: Scanning and transmission electron microscopy were used to study the morphology and formation of the eggshell in the tarnished plant bug, Lygus lineolaris, where the primordial innermost chorionic layer is formed.

TL;DR: Histological, histochemical and ultrastructural studies revealed that the extrachromosomal amplification of rDNA takes place in the oocyte nucleus of Polystoechotes punctatus, a type of ovary of meroistic-polytrophic type.

TL;DR: The results of this study are consistent with the hypothesis that the functional morphology of the tracheal system of harvestmen represents an 'intermediate state' between the trachae system of insects in which gas exchange is focused on the distal portions and that of spiders, in which the walls of all tracheae serve in gas exchange.

TL;DR: The observed differences between T. basteri and H. thomasi sperms support the placing of the two halacarid mites in separate genera.

TL;DR: Quantitative studies show that the total production of secretion increases with proceeding age and can be correlated with a rising egg-laying activity, starting on the eighth day of adult's life, which underlines the main function of the secretion as a lubricant for a facilitated transport of the eggs through the ovipositor.

TL;DR: The goal was to describe the ultrastructure of the Hagen's glands and determine whether they contain DlEPV virions and/or proteins as well as PSP 24, which were detected in homogenates of male wasps.

TL;DR: A panel of monoclonal antibodies was raised against late yolk sacs of the stick insect Carausius morosus and tested by immunoblotting to establish the extent vitellin polypeptides are processed proteolytically during embryonic development.

TL;DR: The results support the suggestion that Systellognatha is a monophyletic group, showing a single sperm pattern and a phylogenetic affinity between Plecoptera and the other orders of Polyneoptera has been confirmed.