Lecture7

Lecture7 - Invertebrate Diversity

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Invertebrate Diversity Phylogeny I. Parazoa P. Porifera (sponges) II. Radiata P. Cnidaria C. Hydrozoa (polyp and medusa) C. Scyphozoa (medusa dominant) C. Anthozoa (polyp only) P. Ctenophora III. Acoelomates P. Platyhelminthes (flatworms) C. Turbellaria C. Trematoda Invertebrate Diversity http://www.rci.rutgers.edu/~uzwiak/GBSummer08/GB102Sum. .. 1 of 22 7/17/08 10:32 AM
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
C. Cestoidea IV. Pseudocoelomates A. Rotifera B. Nematoda (roundworms) V. Coelomates: Protostomes P. Mollusca C. Bivalvia (clams, oysters, mussels and scallops) C. Polyplacaphora (chiton) C. Gastropoda (snails and slugs) C. Cephalopoda (squids and octopuses) P. Annelida (segmented worms) C. Oligochaeta C. Polychaeta C. Hirudinea P. Arthropoda Subphylum Trilobitomorpha Subphylum Chelicerata C. Merostomata (horseshoe crab) C. Arachnida Subphylum Crustacea C. Crustacea Subphylum Hexapoda C. Insecta C. Chilopoda C. Diplopoda VI. Coelomates: Deuterostomes P. Echinodermata C. Asteroidea C. Echinodea C. Holothuroidea Parazoa I. P. Porifera Invertebrate Diversity http://www.rci.rutgers.edu/~uzwiak/GBSummer08/GB102Sum. .. 2 of 22 7/17/08 10:32 AM
Background image of page 2
A. Characteristics 1. Sessile 2. Lack tissue a. Two layers of loosely associated unspecialized cells b. Mesohyl separates cell layers 3. Body parts a. Spongocoel b. Osculum i. Excurrent opening c. Epidermis i. Single layer ii. Outer surface Invertebrate Diversity http://www.rci.rutgers.edu/~uzwiak/GBSummer08/GB102Sum. .. 3 of 22 7/17/08 10:32 AM
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
d. Porocyte i. Forms pores that connect spongocel to outside environment ii. Incurrent channel e. Choanocyte i. Collar cell ii. Major cell of inner cell layer iii. Flagellum surrounded by fingerlike projections iv. Flagellum creates current and food particles are trapped by collar v. Food is phagocytized f. Mesohyl i. Non-cellular gelatin separating cell layers g. Amoebocyte i. Wandering cells in mesohyl ii. Take food from chaonocytes and deliver to other cells iii. Secrete skeletal elements iv. Gamete formation h. Spicule i. Skeletal fibers ii. Calcium carbonate or silica iii. Located in mesohyl i. Spongin i. Proteinaceous skeletal fiber ii. Flexible Eumetazoa: Radiata I. P. Cnidaria Invertebrate Diversity http://www.rci.rutgers.edu/~uzwiak/GBSummer08/GB102Sum. .. 4 of 22 7/17/08 10:32 AM
Background image of page 4
A. Body plans 1. Two forms 2. May occur at some point in life cycle 3. Polyp a. Sessile b. Adheres to substratum c. Oral end surrounded by tentacles 4. Medusa a. Bell-shaped b. Passive drifting or weak contraction of bell c. Downward facing oral opening surrounded by tentacles 5. Cnidocytes Invertebrate Diversity http://www.rci.rutgers.edu/~uzwiak/GBSummer08/GB102Sum. .. 5 of 22 7/17/08 10:32 AM
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Stinging cells b. Eversible capsule i. Contains cnidae B. Characteristics 1. Gastrovascular cavity a. Filled with water b. Acts as a hydrostatic skeleton c. Simple nerve net i. no brain C. Classification 1. Hydrozoa a. Life cycle include polyp and medusa body forms 2. Scyphozoa a. Life cycle is medusa dominate 3. Anthozoa a. Life cycle is exclusively polyp
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 22

Lecture7 - Invertebrate Diversity

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online