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Functional morphology, ontogeny and evolution of mantis shrimp‐like predators in the Cambrian
TLDR
The arrangement of the elbow joint supports the view that the great appendage evolved into the chelicera of Chelicerata sensu stricto, as similar joints are found in various ingroup taxa such as Xiphosura, Opiliones or Palpigradi.
Morphology and function in the Cambrian Burgess Shale megacheiran arthropod Leanchoilia superlata and the application of a descriptive matrix
TLDR
Different aspects of the morphology, for example, the morphology of the great appendage and the presence of a basipod with strong median armature on the biramous appendages indicate that L. superlata was an active and agile necto-benthic predator (not a scavenger or deposit feeder as previously interpreted).
A holomorph approach to xiphosuran evolution—a case study on the ontogeny of Euproops
TLDR
A holomorph approach is proposed, i.e., reconstructing ontogenetic sequences for fossil and extant species as a sound basis for a taxonomic, phylogenetic, and evolutionary discussion of Xiphosura.
A new species of Markuelia from the Middle Cambrian of Australia
TLDR
A new species of 'Markuelia' from the Middle Cambrian of Australia, a taxon based exclusively on embryonic specimens found amongst material collected in 1986, which differs from the previously described species in size and in the presence of an abaxial row of four soft, slim, elongate, tubulous outgrowths dorsally in the anterior region.
The implications of a Silurian and other thylacocephalan crustaceans for the functional morphology and systematic affinities of the group
TLDR
While the new features reported here are consistent with a eucrustacean affinity, most previous hypotheses for the position of Thylacocephala within Eucrustacea (as Stomatopoda, Thecostraca or Decapoda) are shown to be unlikely.
Evolving Pathways Key Themes in Evolutionary Developmental Biology: Basal euarthropod development: a fossil-based perspective
TLDR
This chapter reviews the morphological development of early arthropods from two perspectives, that provided by ontogenetic series based on the well-preserved biomineralised exoskeletons of trilobites and ‘Orsten’-type preserved faunas, in which patterns of segment generation common to these different sources may provide insight into the developmental mode of basal Euarthropoda and thus into the evolution of arthropod ontogeny.
†Henningsmoenicaris scutula, †Sandtorpia vestrogothiensis gen. et sp. nov. and heterochronic events in early crustacean evolution
TLDR
Based on new information and data of other ‘Orsten’ taxa, particularly those assigned already to the early evolutionary lineage of Crustacea, a small-scale computer-based phylogenetic analysis was performed, detecting three peramorphic heterochronic events in the evolutionary lineage towards Eucrustacea.
Evolution of insect wings and development – new details from Palaeozoic nymphs
TLDR
It is demonstrated that some Carboniferous nymphs – those of Palaeodictyopteroidea – possessed movable wing pads and appear to have been able to perform simple flapping flight, and the reconstructed evolutionary scenario contains gaps and uncertainties.
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