Please use the images and descriptions below to move down through a set of decisions.
Some groups may be very general and you may have to try selecting different groups, exploring
further choices to decide what best describes your specimen.
After a set of decisions you will end at a taxonomic level whereafter more detailed morphology may be
required than can be provided in this visual guide. Once you reach this stage, you wil recieve textual
information and references from the taxonomic list, and may also be able to move further down and read
more about the lower taxonomic levels.
Please click on the group name or the image to select a choice.
[Start of guide]