hi everyone welcome to this episode of carpet labs in today's video we're going to look at classifying the invertebrates so we're going to start by looking at what we mean by an invertebrate and then going through each of the different kind of classes or groups of invertebrates that are out there and in previous video we looked at and classifying vertebrates and so where we have kind of a smaller number of groups invertebrates are much more diverse and numerous kind of group of living things on planet Earth so there's a few more things that you're going to need to take note of so just make sure that you're prepared for that we're going to keep things short and sweet as much as possible okay so when we're looking at an invertebrate we're thinking about things that have no internal backbone or skeleton okay so uh all you know things that kind of fit within that definition you can see a wide range of them here in the images on the screen okay now for some things that there's no form of hard structure or backbone at all others it is an external and exoskeleton instead okay and so here is kind of the roadmap of the different classes and groups of invertebrates that we can classify them into okay so we've kind of got these six main kind of kind of areas that we're gonna we're going to look at but you can see that this one over here arthropods and this one the worms and which is not a scientific definition it's just a way to kind of cluster them together can be broken down further into smaller groups based on other similarities okay so we're going to go through each one of these into we're going to start by looking at the arthropods okay so after I've relating to joints like arthritis that arthropods and pod is great for legs and arthropods have pairs of jointed legs they also have a hard shell or exoskeleton on the outside I'm obviously the house strong that are tough that is depends on you know when we're comparing things like a fly to a cramp and that you know there's a difference there but they all have this hard outside and the idea is that this exoskeleton or this hard shell will malt or kind of be shed as growth because they're kind of crack it open and then they think they growing out of it as they grow and develop one of the sub characteristics or subgroups is are insects okay so insects have a body that's in three segments the and the head the thorax and the abdomen and that they also have three pairs of legs and so we're looking at things like ants and butterflies we're looking at our fliers grasshoppers ladybug beetles okay they're all examples of insects very wide and a very diverse group we also have you know you may not like some of these images I tried to pick something cute down here and arachnids okay so arachnids have like spiders and ticks and scorpions have a body in two segments so they're kind of a combination of the head and the thorax and then an abdomen they also have four pairs of legs or eight legs altogether okay so spiders scorpions teeth are all examples of arachnids that we might encounter then we come across crustaceans okay so crustaceans are after posts that live in aquatic environments so they might be underwater they might be in kind of Creek areas they might be fully water based or they might be able to go on land as well and so when talking about things like crabs which lobsters prawns Gabby's and Balmain bugs all those sorts of things are all examples of crustaceans and in the last kind of two sections which were looking at here together are the centipedes and the millipedes okay so centipedes are aside from then the name suggests a hundred legs but they don't actually have 100 legs they could have a lot less or they can have a lot more they defined as having one pair of legs for every segment of their body and whereas their millipedes which don't have a million thousand legs sorry they have two pairs of legs for every body segment okay that's how we would tell them apart now we're gonna have a look at mollusks so kind of shifting away from the arthropods altogether mollusks okay so mollusks there's kind of three main groups we're going to look at out here we've got kefir what's called Kevlar pots or was so careful limit is great for head pot is foot so it's kind of head foot and so it's where the head is connected to their legs so things like squid and octopus and Nautilus how much is this over here and are careful applaud so their legs connected to their head structure gastropod is called stomach foot so things like slugs and snails are examples of that so where their foot or their foot kind of structure is connectors to their body like this stomach or abdomen kind of area abdomens the wrong kind of word to use but you can get the idea and then we also have things like bivalves so like pee pees and Claire's where they've kind of got two hard parts of a shell that are they're kind of connected together they're open and closed to protect a soft body on the inside and you know so things like the giant clam over here so they are called by valves then we come to Akina d'oeuvres Akina dome stands for spiny skin so it's go forward from the same way that we get echidna from the side of spiny and do is for skin and to spiny skinned things like and so if so things like sea stars and sea urchins and sea cucumbers some of the features they at least say they're radially symmetrical so they start they have up a similar kind of center point and then they're symmetrical whereas they kind of move out to the edges of their body and they also have like a tube kind of foot which is how they kind of can move around or they can attach so something as strange as a sea urchin you know actually does have a way to move around there's a crown of thorns starfish sea cucumber and another different type of sea star okay and we now have the mid areas now let's see is silent and because it comes from it comes from the great way to sting because the the group and they're members of this group often have stinging capabilities they have hollow soft bodies so no skeleton to speak of and but they and they do have this ability to sting so you know things like a jellyfish or an Anatomy or a blue bottle that they have the capability to to sting predators or to help to protect themselves okay so there are all examples of materials and and coral polyps which like which make up this brain hole for example are also need areas that the coral structure itself is also is a mineral thing so it's kind of a combination of the living thing and then the nonliving part as well now we're going to have a look at words remember that we talked about worms being kind of three other groups and that we become kind of simplify to be talking about winners so firstly we call what's called an alerts or segmented worms so if thinking like an earthquake here you can see that it's got different parts to its body with this kind of like stick a bit in the middle where it's connected and so similar sort of thing over here that makes them have segments we talked about with platy helmets or flat worms so examples here so I actually have a really thin flat ribbon like body instead of round and in segments and then we talked about nematodes which are just round worms so they don't have segments to their body and they've got some slightly different internal structure which we're not really going to worry about at the moment and that they have a round from cylindrical body and tapered ends at the mouth and then the anus of the other end so annelids plenty helmets and nematodes are the three classes of Williams that make up it don't in the invertebrates and now we're going to look at the sponges okay so sponges or poor affero because it's the same sort of where we get the same word porous or things that have holes in them and so that they gain nutrients from the water that passes through them that they're able to pick up these nutrients that are dissolved in the water as the water moves through their structure they've got very kind of simple bodies but they've got a lot a fair bit of internal structure which allows them the nutrients to be picked up so kind of they pay most of what they make up their bodies inside away from what you can see okay so we looked at what is an invertebrate thinking about things that don't have an internal skeleton or backbone they may have an exoskeleton or they may have nothing or some other kind of structure but it's not an internal skeleton and we looked at the different classes of invertebrates we looked at arthropods being made up of insects arachnids crustaceans centipedes and millipedes we looked at mollusks with soft bodies and hard shells though there may be gastropods or kevlar pods or five valves we looked at a keener domes spiny skin you know so with soft bodies and then this this finds on the outside and we looked at mid areas that have the ability to sting and skeleton to speak of poor affero we're talking about sponges and then worms annelids plenty helmets and nematodes alright thanks very much for watching don't forget to Like and subscribe bye for him