The Hellgrammite: You Won't Believe this Strange Insect Exists! скачать в хорошем качестве

The Hellgrammite: You Won't Believe this Strange Insect Exists!

#insect #creepy #nightmare Life in a flowing river can be tough, especially without being a strong swimmer like trout. Rivers, though, are home to a great diversity of macroinvertebrates; arthropods that can be easily seen with the naked eye if you look for them. Most are rather strange looking, and some have truly nightmarish features. Few though are as creepy as the larvae of megalopterans, known as hellgrammites. The Helgramites most noticeable feature upon inspection however are the fearsome mandibles, the mandibles of a carnivore. They feed on a variety of small aquatic invertebrates, which they snatch up with these powerful jaws. When confronted by a predator or another hellgramite they can use them for defense. Despite their monstrous appearance, helgramites are rather delicate creatures that require prisine, well oxygenated water. They are generally intolerant of pollution, and so their presence or absence can indicate the health of a river or stream. It takes years for hellgrammites to grow to the size of these individuals, and this long maturation makes them particularly vulnerable to pollution or even over collection. Megaloptera are fascinating because they are among the most basal lineage of holometabolous insects, that being they go through a distinctive larval, pupal, and adult stage, but are not as derived as more famous examples of insects like this. When a hellgrammite has grown enough and is ready to mature it leaves the water and goes into a non-feeding pupal stage in the moist soil under a rock or log. Unlike the chrysalis of a butterfly however, this pupa retains the legs and so are motile. Eventually, the adult insect is ready to emerge. Known commonly as a dobsonfly, they are very large impressive flying insects. Sources Hoell, H. V.; Doyen, J. T. & Purcell, A. H. (1998). Introduction to Insect Biology and Diversity (2nd ed.). Oxford University Press. pp. 441–443. ISBN 0-19-510033-6. Chestnut;, C. (2013, December 26). Creature Feature: Hellgrammites, not the prettiest creatures in Southwest Florida. Retrieved September 10, 2020, from https://www.news-press.com/story/news... Hall, D. W. (2007, July). Eastern Dobsonfly. Retrieved September 10, 2020, from http://entnemdept.ufl.edu/creatures/m... Music Myst on the Moor by Kevin MacLeod Link: https://incompetech.filmmusic.io/song... License: http://creativecommons.org/licenses/b... If you like animals and nature Please Subscribe and Like Welcome to Ecotasia! On this channel you can find wildlife footage and short documentaries on the natural world. I am an early career biologist who was inspired by the likes of the BBC Natural History unit, PBS, and Animal Planet as a child and then more recently by various nature YouTube channels to share my love for animals and nature. My goal is to document and highlight the interesting ecology and behavior of organisms I encounter, as well as cover and elucidate conservation and biological topics. Please Subscribe so you can join me to marvel and to learn twice a month. Underwater Worlds    • Life Underwater   Journey through the Undergrowth (Macro footage of insects and Arachnids)    • Insect and Arachnid Documentaries   Bird Playlist    • How can Woodpeckers drill wood without dam...   Birding Playlist    • Playlist   Conservation Playlist    • Fundamentals of Conservation Biology   also Check Out my Photography Adventure Blog https://johnjacksonphoto.blogspot.com/ #learning