Aims: To observe the morphology of the larva of A. aegypti in detail and to evaluate their morphometry. Place and Duration of Study: Place – St. John’s College, Agra. Duration – June, 2011 to May, 2012. Methodology: Morphology of larval head, antennae, compound eyes, median brush (palatum), lateral brush; neck; thorax; abdomen, comb spine, siphon, siphon teeth and anal papillae were observed an...

Figure 1: Conventional non-shingled writing, on the left, writes data in non-overlapping tracks, width w, with non-magnetized “guard regions”, width g, between tracks. Shingled writing, on the right, leaves residual tracks, width r, less than the width of the written track, width w’, before it writes the next track, largely overlapping adjacent tracks. This increases tracks per inch, increasing...

Instar determination of field-collected insect larvae has generally been based on the analysis of head capsule width frequency distributions or bivariate plotting, but few studies have tested the validity of such methods. We used head capsules from exuviae of known instars of the beet armyworm, Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae), to determine the larval instars with the frequen...

Caetetermes Fontes, 1981 is a monotypic South American genus of Nasutitermitinae. Its single species, Caetetermes taquarussu Fontes, 1981, was described based on morphological characters from soldiers and workers collected at three localities in the tropical rainforest of northeastern Ecuador. Several samples of C. taquarussu represented also by the imago caste were examined at the Museu de Zoo...

Morphometric comparisons of two populations each of Races 1 and 2 of Meloidogyne arenaria from tobacco, peanut, and soybean in different localities in Florida showed no significant differences in any characters measured by light microscopy. Thirteen morphometric characters of females, 22 of males, and 21 of infective second-stage juveniles were measured for each population. The stylet length in...

Ontogenetic studies of vertebrate feeding performance can help address questions relevant to foraging ecology. Feeding morphology and performance can either limit access to food resources or open up new trophic niches in both aquatic and terrestrial systems. Loggerhead sea turtles are long-lived vertebrates with complex life histories that are marked by an ontogenetic shift from an oceanic habi...

A long-standing hypothesis for the adaptive radiation of macrostomatan snakes is that their enlarged gape--compared to both lizards and basal snakes--enables them to consume "large" prey. At first glance, this hypothesis seems plausible, or even likely, given the wealth of studies showing a tight match between maximum consumed prey mass and head size in snakes. However, this hypothesis has neve...