My Biology Musings

  Star"fish" and Sea"horse" Starfish or Sea-stars: Starfish on a beach Travel photo created by awesomecontent - www.freepik.com These organisms are  not actually fishes  as they don't have fins, scales or gills like normals fishes have. Researchers call them  sea-stars  to be more specific with the meaning of its name. Some important characters of sea-stars are interesting but few of them could be stomach-turning. There are more than 20,000 species of starfish and all in a variety of beautiful different colours. This animal is mostly known for its five-feet shape, but some of them have upto 35 to 40 arms. These are Deep sea creatures without any circulatory system or a proper skeletal system like humans. They don't come under the category of fishes, rather, are placed under  invertebrates , in phylum Echinodermata . Mostly exhibit  radial symmetry . Means if cut a starfish from any point in the centre it will always give equal halves. They  don't...

JELLYFISHES Jellyfish??? Are they really fishes?  Group of jellyfish called "smack" Water photo created by jcomp - www.freepik.com No, jellyfish is not actually a fish, as a fish has backbone (kind of) and are vertebrates but jellyfishes are some kind of  dome shaped creatures with tentacles . They are more closely related to sea-anemones and corals. Researchers called them fish before, when proper classification was not possible. They can be called as the oldest animals, around 650 million years old. They look exactly like jelly while floating so the name "jelly". They are found in variety of size and shapes with small microscopic to huge ones.  But....There is something very interesting Jellyfish has very interesting things in store. Could you imagine our body functioning without a brain, heart, lung or any other organ? No you can't. Jellyfish has a fascinating body organisation as it does not have  Brain, Lungs, Bones, Heart etc. But they have teeths and eat...