“Crap crab legs” at one minute 20 seconds lol

These videos are very, very helpful. Just one thing though... I guess classifications have changed since you did this video. It's 2014 now and what I've learnt in class is that there are four sub-phyla (Trilobita, Crustacea, Chelicerata & Uniramia). The classes under Chelicerata are; Xiphosura (horseshoe crab), Pycnogonida (Giant Sea Spider), & Arachnida with the Orders - Aranae (spiders), Scorpiones (scorpions), Pseudoscorpiones (pseudoscorpions), Opiliones (Daddy-long-legs), & Acarini (ticks & mites). The classes under Crustacea are Malacostraca, Phyllopoda, Anostraca, Copepoda and Cirripedia.

I have been looking for a video like this for so long!!!

Phylum Arthropoda is the largest by number of species only. The largest Phylum by total individual organisms is Phylum Nematoda (roundworms): "They are found in every part of the earth's lithosphere.[4] They represent, for example, 90% of all life forms on the ocean floor.[5] Their numerical dominance, often exceeding a million individuals per square meter and accounting for about 80% of all individual animals on earth"

@KJKP

4 жыл бұрын

+XMIR10C... and we can meet many of these bottom dwellers in the thread beneath youtube videos! ...had to be said. Hahahahaha.

during the carboniferous time. large dragonflys and arthropods do exist. i heard because of the increase in oxygen concentration in the air

about the size of arthropods... there were huge terrestrial arthropods in the Permian, therefore arthropods aren't limited by their exoskeleton in growth

I wish youtube had more videos like this, perhaps at the college level though, and less moronic videos.

@edthoreum7625

7 жыл бұрын

way too much saccharine in diets of general public?

@livvielov

Жыл бұрын

Moronic? You must mean monotone. If you plan on going to university I'd get used to that and learn to love the content over its delivery

@rerun374

Жыл бұрын

@@livvielov I went to university a long time ago. Now I want to be entertained while learning something. Unless KZread plans on giving me a certificate with this video...

Awesome video, thanks

u have helped me so much.

Very helpful !!!

I still don't get it, can they be big and active if they have an incomplete circulatory system? Explain please.

Thank you so much.

Thank you!

So helpfull

Why molluscs (mainly cephalopods) , even though they don't have exoskeleton, don't experience dessication in sea marine environments?

You the real MVP

@Anna Symmetries are not defined at the molecular level, but rather at the morphological. Sure they have more similar genes to bilaterial animals, and are nested in the group "Bilateria", but saying they are bilateral molecularly doesn't make any sense to me. Other than that I get your point.

that is actually not entirely correct, they evolved from a bilateral ancestor and only their larva forms still show bilateral symmetry. So in the sense that they are bilateral molecularly is only partially true, as they are now sessile with radial symmetry. Echinoderms or the sea stars are technically pentaradial, given that they have 5 arms which all store the same organs.

Aren't crustacea there own subphyla now?

mouth parts( chelicerata & mandibulata ) 6:00

Just to tell you, Echinoderms are actually bilateral molecularly. They my look like they have radial symmetry but they don't.

cooldragonx9

this dude got the rona