By Charles W. Heckman
Anisoptera is the 1st of 2 volumes at the Odonata in the sequence Encyclopedia of South American Aquatic bugs. The moment will treat the Zygoptera.
The Anisoptera volume encompasses the massive dragonfly species. A short evaluate of the biology of the crowd contains illustrations of the most morphological positive factors in addition to explainations of different structures for naming the wing veins and different structures. this can arrange the consumer of the volume to comprehend different names for a similar structures that he'll stumble upon within the literature.
The review is then by keys to facilitate identification of the grownup dragonflies and the recognized larvae, allowing the user a excessive likelihood of picking his specimens correctly. as well as anatomical gains, the keys comprise the identified levels of the species, synonyms, and citations of literature during which additional info approximately every one person species will be obtained. those citations are compiled in an in depth bibliography, together with titles of the unique courses during which descriptions of virtually all South American species appeared. even though taxonomic revisions are intentionally shunned, feedback for added learn are supplied the place the validity of taxa turns out doubtful.
To give you the consumer with the very best chance to differentiate the species, the keys are richly illustrated with pen and ink drawings of hundreds of thousands of person morphological constructions prepared in 797 figures. it's definite that major adjustments will take place within the systematics of South American dragonflies sooner or later, and this ebook should still give you the impetus had to speed up the revisional work. in the meantime, it's going to supply a entire review of the Anisoptera in South the USA that's another way unavailable to most South American scien
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Additional info for Encyclopedia of South American Aquatic Insects: Odonata - Anisoptera
At rest, this structure is normally held folded along the ventral sides of the head and thorax. Some structures on the labium frequently used as identifying features are depicted in Fig. 8. Most dragonfly larvae hunt by remaining motionless as their prey approaches or moving very slowly toward the prey. As soon as it comes within its capture distance, the labium shoots forward, and its modified labial palps grasp the prey, which is immediately pulled into contact with the other mouthparts and chewed.
These attacks by up to several hundred mosquitoes forced researchers in the wetland to either dress in clothing that covered all parts of the body while the heat and humidity were extremely high or flee the wetland. After one of these swarms emerged from the brush to harass me which I was analyzing water samples, a swarm of dragonflies arrived and began snapping the mosquitoes out of the air, sometimes only centimeters in front of my face. These dragonflies, probably Erythrodiplax castanea, were able clear the air of all mosquitoes in only a few minutes (Heckman, 1998a).
Anisopterans are typically associated more with the preferred kind of habitat than with any particular geographical region. Obviously, being extremely strong flyers, the large dragonflies are able to travel long distances and find new water bodies suitable for spawning. The limitation on their ranges is therefore related almost exclusively to the presence of suitable habitats for the larvae. Spawning females of many larger dragonflies deposit their eggs directly in the water by skimming the tips of their abdomens across the surface of the water.