Phylogenetic systematics is the discipline concerned with reconstructing the evolutionary relationships among organisms by analysing shared derived characteristics. It provides a framework for ...
Sponges (phylum Porifera) represent the earliest-diverging lineage of multicellular animals, distinguished by their porous bodies, internal skeletal elements and remarkable morphological diversity.
Reflections on the history of systematics / Robert E. Kohler -- Willi Hennig's part in the history of systematics / Michael Schmitt -- Homology as a bridge between evolutionary morphology, ...
Also available electronically via World Wide Web in PDF format from BioOne and from the AMNH website. Squamata (amphisbaenians, "lizards," mosasaurs, and snakes) is an extremely diverse clade with a ...
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