Studies on the biology and functional morphology of Triplectides obsoleta
Degree GrantorUniversity of Canterbury
Degree NameMaster of Science (Hons)
Triplectides obsolete overwinters in the larval state, and larval stages may therefore be found at all times of the year. The first part of this section entails a description of the external features of the larval form. It appeared that the larvae changed little in form throughout their larval life, for no obvious features could be found which differed greatly from one instar to the next, the main change being a gradual increase in size due to normal growth processes.
The primary aim of this section was to determine the number, and if possible the duration of the larval instars; secondly that the instars may be distinguished from each other so that by sampling the population over the autumn, winter and spring months the changes in proportion of the instars represented in the population during this time could be shown. Simultaneously and indication of the larval growth and habitat distribution has been obtained. The larval case and the case building habit is dealt with in a later section. The egg mass of T. obsolete was not found in the field, but two masses were laid by one female in the laboratory. A description of these and the contained eggs is given at the end of 1/3. The 1st instar larva partly on account of the difficulty in obtaining egg stages has not been found. Consequently its description has had to be omitted from this work.