WALOSZEK, D.; University of Ulm: Evolutionary History of Crustacean Segmentation and Tagmosis: A Fossil-Based Perspective Evolution of crustacean segmentation, the formation of jointed body segments, the formation of groups of segments (tagmosis), and the formation of jointed articles along segmental appendages cannot be viewed separately from historical traits and functional constraints. Much of this system […]

BUDD, Graham E; ERIKSSON, B. Joakim; WENNBERG, Sofia; Uppsala University; Uppsala University; Uppsala University: The evolution of terminal patterning in arthropods Living arthropods represent one of the three classically “eusegmented” clades, the others being annelids and vertebrates, but the relationship between the patterning of these groups is unclear. Such problems may be resolved in two […]

KAUFMAN, Thomas C.; LIU, Paul Z.; Indiana University; Indiana University: The Role of Gap and Pair Rule Genes in the Segmentation of the Germband of Oncopeltus Segmentation in long germband insects occurs simultaneously across the entire body. A cascade of genes patterns the embryo along its anterior-posterior axis by subdivision of the blastoderm. This is […]

PATEL, Nipam H.; University of California, Berkeley: The Evolution of Segmentation – Mechanisms of Terminal Addition Pattern formation is particularly well understood in the model species, Drosophila melanogaster. Arthropods, however, display remarkably diverse modes of early embryogenesis and striking variations in morphology. I will present our efforts to examine early events of pattern formation in […]

DAMEN, W.G.M.; Institute for Genetics, University of Cologne, 50931 Cologne, Gemany: Terminal addition in arthropods: The molecular basis of segmentation in spiders and millipedes There is an ongoing discussion whether segmentation in different phyla has a common origin sharing a common genetic program. We study the evolution of the segmentation process in the arthropod phylum […]

POURQUIE, Olivier; Stowers Institute for Medical Research: Segmental Patterning of the Vertebrate Axis The vertebrate body can be subdivided along the antero-posterior (AP) axis into repeated structures called segments. This periodic pattern is established during embryogenesis by the somitogenesis process. Somites are generated in a rhythmic fashion from the paraxial mesoderm and subsequently differentiate to […]

MOOI, R.*; DAVID, B.; WRAY, G.; California Academy of Sciences, San Francisco; University of Burgundy, France; Duke University, Durham: Arrays in rays: terminal addition in echinoderms by the “Ocular Plate Rule” The echinoderms are deuterostomes that superimpose radial symmetry upon a bilateral larval morphology. Consequently, they are not the first animals that come to mind […]

MINELLI, A.; University of Padova: A morphologist’s perspectives on terminal growth and segmentation In many lophotrochozoans and crustaceans, the main body axis is elongated by the proliferative activity of teloblasts. There are ecto- and mesoteloblasts, but no endoteloblasts: the elongation of the main body axis is led by the external �somatic animal�. From the point […]

LEVITAN, D.R.; Florida State University: Theory and empirical evidence for the role of egg size on fertilization success in marine invertebrates The amount of energy invested in individual eggs is a critical life history trait. The obvious cost of producing relatively large eggs is decrease in the number of eggs that can be produced per […]

EMLET, R.B.; Univ. of Oregon, OIMB: Linking stages of life history: How larval quality translates into juvenile performance Experimental manipulations of offspring quality combined with outplanting of juveniles in the natural environment allow strong tests of the influence of offspring quality on juvenile performance. By experimentally manipulating food given to larval barnacles (Balanus glandula) and […]