Introduction to Invertebrate Phyla

<p>Protection and support (D)</p> Signup and view all the answers

<p>Echinoderms (A)</p> Signup and view all the answers

<p>Closed circulatory system (D)</p> Signup and view all the answers

<p>High intelligence and advanced sensory organs (A)</p> Signup and view all the answers

<p>Head, thorax, and abdomen (C)</p> Signup and view all the answers

<p>Marine environments (B)</p> Signup and view all the answers

<p>Sexual reproduction (C)</p> Signup and view all the answers

<p>First multicellular animals (A)</p> Signup and view all the answers

<p>Movement and feeding (C)</p> Signup and view all the answers

<p>Arthropoda (B)</p> Signup and view all the answers

<p>Mollusca (C)</p> Signup and view all the answers

<p>Specialized stinging cells (cnidocytes) (A)</p> Signup and view all the answers

<p>Bilateral symmetry (A)</p> Signup and view all the answers

<p>Pseudocoelom (D)</p> Signup and view all the answers

<p>Annelida (A)</p> Signup and view all the answers

<p>Hard shell made of calcium carbonate (C)</p> Signup and view all the answers

<p>Formation of a head with sensory organs (A)</p> Signup and view all the answers

<p>Cnidaria (B)</p> Signup and view all the answers

<p>Regenerate lost parts (D)</p> Signup and view all the answers

<p>True body cavity (C)</p> Signup and view all the answers

<p>Cylindrical body covered by cuticle (C)</p> Signup and view all the answers

<p>They lack circulatory and respiratory systems. (A)</p> Signup and view all the answers

<p>Through muscular contractions of their segmented bodies (D)</p> Signup and view all the answers

<p>Cnidaria use stinging cells to capture prey, while Porifera filter food from water. (B)</p> Signup and view all the answers

<p>Sexual reproduction with separate sexes (C)</p> Signup and view all the answers

<p>Ability to form biological reefs (C)</p> Signup and view all the answers

These simple animals are the most basic multicellular organisms, lacking true tissues, organs, and body symmetry. They filter food from water using specialized cells called choanocytes.

This phylum includes jellyfish, coral, sea anemones, and hydra. They are characterized by radial symmetry, two tissue layers, and specialized stinging cells called cnidocytes.

Flatworms are bilaterally symmetrical, have three tissue layers, and lack a body cavity. They include free-living forms and parasitic types like tapeworms and flukes.

Roundworms are bilaterally symmetrical, unsegmented, and have a body cavity not fully lined by mesoderm. They have a tough cuticle and a complete digestive system.

Segmented worms belong to this phylum. They have a true body cavity, a segmented body, and bristles called setae for movement.

They obtain nutrients by filtering plankton and organic particles from water, which is pumped through their body channels.

They use stinging cells (cnidocytes) to capture and paralyze their prey, which they then consume.

They lack circulatory and respiratory systems, relying on diffusion for gas exchange and nutrient transport. This limits their size and makes them mostly flat.

Animals with a closed circulatory system and a well-developed hydrostatic skeleton.

A group of soft-bodied animals with a hard shell (in most), including snails, clams, and octopuses.

The largest phylum in the animal kingdom, with a segmented body and an exoskeleton made of chitin.

Marine animals with radial symmetry in adults and a unique water vascular system for movement and feeding.

The earliest multicellular organisms in the animal kingdom.

A unique feature of some arthropods that involves a dramatic change in body form, often with larval stages.

A fluid-filled cavity that acts as a skeleton, providing support and allowing for movement.

The process of fertilization occurring outside the body of the organism.

Cnidarians were the first animals to evolve true tissues, like muscle-like cells for movement and nerve cells for sensing the environment.

Cnidarians were the first to develop stinging cells called cnidocytes, which are used for capturing prey.

Platyhelminthes were the first to have a body plan with a left and right side, allowing them to move in a directed way.

Platyhelminthes were the first to have a centralized nervous system, allowing them to process information more efficiently.

Nematodes were the first animals to have a complete digestive tract, with a mouth and anus, allowing for more efficient digestion.

Nematodes were the first to develop a body cavity called a pseudocoelom, which provides space for organs and better movement.

Annelids were the first to have a segmented body plan, allowing for more efficient movement and specialization of body regions.

Annelids were the first to have a closed circulatory system, with blood contained in vessels, which enhances oxygen and nutrient delivery.

A specialized feeding structure found in most mollusks. It's a tongue-like organ with rows of teeth used to scrape food off surfaces or drill into prey.

This means they have a body cavity that's not fully lined by mesoderm. This is common in roundworms.

This unique hydraulic system in echinoderms is used for movement, feeding, and respiration. It's a network of canals filled with water.

Arthropods have a hard, external covering made of chitin. It provides protection and support for their bodies.

These highly intelligent invertebrates, like octopuses and squids, are famous for their complex brains and problem-solving abilities.