Annelida, traditionally divided into Polychaeta and Clitellata, is an evolutionary ancient and
ecologically important group today usually considered to be monophyletic. However, there is …

A comprehensive phylogenetic analysis of the Terebellidae and related families was
undertaken. Type material of all genera of Terebellinae was examined, together with …

The formal definition of species as explanatory hypotheses presented by Fitzhugh (Marine
Biol 26: 155–165, 2005a, b) is emended. A species is an explanatory account of the …

Known as shovel head worms, members of Magelonidae comprise a group of polychaetes
readily recognised by the uniquely shaped, dorso-ventrally flattened prostomium and paired …

The dangers of character reification for cladistic inference are explored. The identification
and analysis of characters always involves theory-laden abstraction—there is no theory-free …

Abstract Members of Parasabella minuta Treadwell, 1941, subsequently moved to
Perkinsiana, were collected during a survey of rocky intertidal polychaetes along the state of …

Orbiniid phylogeny is matter of debate and incongruence between hypothesis based on
molecules and morphology has been repeatedly reported. Moreover, the phylogenetic …

1. Introduction “... it follows that we should not regard the organism or the individual (not to
speak of the species) as the ultimate element of the biological system. Rather it should be …

The emphasis on testing phylogenetic hypotheses has been prominent since the English
language introductions of Willi Hennig's Phylogenetic Systematics (1966) and Karl Popper's …

Abstract Ernst Mayr's (1961, Science 131: 1501–1506) distinction between proximate and
ultimate causation in biology is examined with regard to the acquisition of understanding in …