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5000 species Porifera
Asymmetric bodies and lack distinct tissues, often classified from other animals Porifera
Immobile except in early stages Porifera
Collect food particles by sweeping flagellated cells Porifera
Flagellated cells Choanocytes
10,000 species Cnidaria
Also Called coelenterate Cnidaria
Develop from two layered embryo and have two separate tissue layers and radial symmetry Cnidaria
Diploblastic two-layered
Two live stages, mobile usually medusa and the sessile polyp Cnidaria
Nematocysts Stinging cells
Hydras, Sea anemones, Corals, Jellyfish, portugese man o war Cnidaria
15, 000 species Platyhelminthes and Nematoda
Flatworms are most primitive phylum to develop this Triploblastic (3 layered embryo).
Bilateral body symmetry, and are acoelomate (lack body cavity) Platyhelminthes
Space between digestive tract and body wall is filled with tissue Platyhelminthes
Have true head and brain, but digestive system has one opening that functions as both mouth and anus Platyhelmintheez
Most are flatworms and hermaphroditic Platyhelminthees
Parasites like tapeworms, flukes, and free living organism like planarians Platyhelmintheez
Roundworms Nematoda
Unsugmented worms that live in many habitats Nematoda
Pseudocoelomate Nematoda
3 tissue layers that are concentric, but the body cavity is not lined with tissue from the mesoderm Nematoda
Mesoderm middle embryonic layer
Like platyhelmintheez are parasitic and freeliving Nematoda
Hookworms and things that cause elephantiasis, trichinosis, and river blindness Nematoda
Soil ones are pests, but others kill plant pests Nematoda
The nematode species that is common subject in genetics labs - Caenorhabdis elegans
11,500 species Annelida
Segmented worms represent first lineage of truly eucoelomate animals Annelida
Eucoelomate having a body cavity lined with mesoderm tissue)
Body cavities are lined with tissue derived from embryonic mesoderm Annelida
Polychareta and terrestrial Oligochaeta classes and leeches Annelida
Earthworms Annelida
Have kidney structure, blood vessels, and sometimes hermphroditism Annelids
800,000 species Arthropoda
Most diverse and duccessful phylum on earth with about 75% of all species Arthropoda
Characterized by joited legs and a chitinous exoskeleton Arthropoda
Segmented but segments are usually fused into larger body parts with special function Arthropoda
Insects, centipedes, millipedes Uniramia
Arachnids, sea spiders, horseshoe crabs Chelicerata
Shrimps, lobsters, crabs, crayfish, barnacles, pillbugs Crustacea
Trilobites (now extinct) Trilobitomorpha
Only 1 specie Cycliophora
Symbion Pandora cycliophora
Tiny invertebrate first identified in 1995 when Danish biologist foujnd species in mouth of Norweigan lobster Symbion Pandora
Closely related to marine phyla Entoprocta and Ectoprocta Cycliophora
50,000 species Mollusca
Second most diverse phylum Mollusca
Soft body covered by a thin mantle, with a muscular foot and an internal visceral mass mollusca
Two fluid filled body cavities derived from mesodermal tissue Mollusca
Small coelom and large hemocoel that functions as open circulatory system Mollusca
Shell composed of calcium carbonate and protein, secreted by mantle Mollusca
Gastropoda (Slug, Snail), Bivalvia (clams, oysters, scallops), Cephalopoda (nautilus, squids, octopi) Mollusca
6,500 species Echinodermata
Endoskeleton composed of many ossicles of calcium magnesium carbonate - Echinodermata
Water Vascular system, ring canal around esophagus, locomotion by tube feet connected by WVS Echinodermata
Five fold radial symmetry Echinodermata
Sea stars, sea urchins, sea lilies, sea cucumber Echinodermata
Hae varying degree of bilateral symmetry Sea cucumbers
True head is absent, oral and aboral are used to describe body orientations echinodermata
Particle feeding through WVS, everting stomach to engulf prey, and scraping device Echinodermata
Scraping device on sea urchins Aristotle’s lantern
44, 000 species Chordata
Home phylum to us Chordata
Sea squirts Urochordata
Lancelets Cephalochordata
true vertebrates and most diverse subphylum. Vertebrata
Pharyngeal gill slits, notochord, post-anal tail, dorsal hollow never cord Chordata
often used as a demonstration organism in biology labs Amphioxus
Created by: kiler10z
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