The mean measure of divergence and the use of non-metric data in the estimation of biological distances

The mean measure of divergence as a means of comparing two populations on the basis of non-metric data is described. Some statistical properties of this measure are derived and it is shown that its variance has frequently been misquoted in the literature. Alternative means of comparing two populations are presented and some improvements to the measure of divergence are suggested.     

Rock Art: A Potential Source of Information about Past Maritime Technology in the South-East Asia-Pacific Region

It is possible that most or all boats and rig-types used in prehistoric times in the South-East Asia-Pacific region have completely disappeared from the record, and that those recorded by Europeans in the 17th century may have been relatively recent innovations. The purpose of this paper is to introduce to the literature a new source of information on ancient boat and rig designs. This source is the information encoded in rock-art depictions of watercraft. This paper provides a technical appraisal of 18 images of watercraft from the Tutuala region of East Timor.
© 2007 The Authors     

Mecochirus Germar (Decapoda: Glypheoidea) in the Lower Cretaceous of Queensland

JELL, P.A., WOODS, J.T. & COOK, A.G., May 2017. Mecochirus Germar (Decapoda: Glypheoidea) in the Lower Cretaceous of Queensland. Alcheringa 41, 514–523 ISSN 0311-5518.

Three new species of glypheoid decapod crustaceans, Mecochirus mcclymontorum, M. bartholomaii and M. lanceolatus, are described from the late Aptian of the Eromanga, Carpentaria and Maryborough basins, respectively. The first two occur in the Doncaster Member of the Wallumbilla Formation and the last in the Maryborough Formation. This is the first record of Mecochirus Germar, 1827 or the Mecochiridae Van Straelen, 1925 in Australia and one of only a few Cretaceous occurrences of this largely Jurassic genus.

Peter A. Jell [amjell@bigpond.com], Jack T. Woods and Alex G. Cook [alex.cook@y7mail.com], School of Earth Sciences, The University of Queensland, St Lucia Queensland 4072, Australia.