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Head development in the onychophoran Euperipatoides kanangrensis with particular reference to the central nervous system
TLDR
Evidence is presented to further support the presence of a terminal mouth in the ground plan of the Onychophora and, hence, an acron may not exist in the arthropod clade. Expand
Onychophoran cephalic nerves and their bearing on our understanding of head segmentation and stem-group evolution of Arthropoda.
TLDR
The model allows the onychophoran cephalic nervous system to be interpreted as a modified circumoral nerve ring, similar to that seen in the nematodes and other cycloneuralians, which is regarded as supporting the Ecdysozoa model of arthropod relationships. Expand
Characterisation and localisation of the opsin protein repertoire in the brain and retinas of a spider and an onychophoran
TLDR
The novel finding that opsins of both the ciliary and rhabdomeric type are present in the onychophoran and a spider suggests that these two types of opsins werePresent in the last common ancestor of the OnyChophora and Euarthropoda. Expand
The function of Notch signalling in segment formation in the crustacean Daphnia magna (Branchiopoda).
TLDR
The expression of homologues of the Drosophila and vertebrate segmentation genes are analysed and it is shown that members of the Notch signalling pathway are expressed at the same time as the pair-rule genes. Expand
Neurogenesis in the water flea Daphnia magna (Crustacea, Branchiopoda) suggests different mechanisms of neuroblast formation in insects and crustaceans.
TLDR
It is shown for the first time that branchiopod neuroblast divide in the same pattern as insect and malacostracan neuroblasts, and the derived characters of malacOSTracans and branchiopods - the absence of neuroblast segregation and proneural clusters - might be used to support or reject the possible groupings of paraphyletic crustaceans. Expand
Unravelling the evolution of neural stem cells in arthropods: notch signalling in neural stem cell development in the crustacean Daphnia magna.
TLDR
The role of Notch signalling is analyzed for the first time in a crustacean, the branchiopod Daphnia magna, and it is shown that it is required in neural stem cells for regulating the time of neural precursor production and for binary cell fate decisions in the ventral neuroectoderm. Expand
Head patterning and Hox gene expression in an onychophoran and its implications for the arthropod head problem
TLDR
Molecular support is provided for the proposal that the onychophoran head possesses a well-developed appendage that corresponds to the anterior, apparently appendage-less region of the arthropod head. Expand
Gene expression patterns in an onychophoran reveal that regionalization predates limb segmentation in pan‐arthropods
TLDR
It is shown that leg regionalization takes place in the legs of onychophorans even though they represent simple and nonsegmented appendages, suggesting that this is the plesiomorphic state in arthropods. Expand
Differential expression of retinal determination genes in the principal and secondary eyes of Cupiennius salei Keyserling (1877)
TLDR
Principle eye development shows pax 6a (ey) expression, suggesting pax6 dependence, although secondary eyes develop independently of pax8 genes and show differential expression of several retinal determination genes. Expand
Expression patterns of neural genes in Euperipatoides kanangrensis suggest divergent evolution of onychophoran and euarthropod neurogenesis
TLDR
It is shown that the nature and the selection of onychophoran neural precursors are distinct from euarthropods, and an evolutionary sequence of arthropod neurogenesis that is in line with the Mandibulata hypothesis is suggested. Expand
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