Zoology
Phylum Annelida
General Information * "Segmented worms" * ----Include about 15,000 species. * Example: Earthworms, leeches, clam worms. * They all have segmented body divided by septa. * Septa * walls of tissue. * These organisms contain Bristols called Satae. * Satae * They use setae to move, burrow, swim (clam works). * These are worldwide organisms. * These are Detrivore * They feed on dead organic material all the way to parasites. (leeches)
Basic Body Plan * Protosmium- head region, lots of segments. * Pigidium- Tail end. * Body wall has * longitudal muscles (up and down move) * circular muscles (forward and bacwards) * Coeleum- filled with fluids.
Internal Anatomy * Nervous System * Contain cerebral ganglia * Two grey balls w/ ventral nerve cord attached that runs down length of body. * Cerebreal Ganglia also analogues to the brain. * Circulatory System * Ex: Earthworm * Contains 5 hearts called arotic arches and dorsal blood vessels. * Closed system * They contain hemobligin (iron)- carries oxygen * Excretory * Contain Nephrida. (Well developed) * Removes waste from blood and coelum-cavity (Comparably to our kidneys) * Respiration System: * Some breathe via Diffusion. * Some have Parapodia
Reproduction * Varies greatly. * Both monoecious, and Dioceious species.
Classes
Class Polychaeta * Clamworms * All marine about 10,000 species named. * Head region Present. * Contain Parapodia * Paired appendeges * Used for swimming, digging, etc, and respiration. * Well developedsetae (hairs) * They don't contain a citellum * Large part of marine foodchain.
Groups of Polychaeta 1. Sedentary polychaetes a. Don't move alot, lazy in our world. b. live in extreme environments. c. Feathery
General Information * "Segmented worms" * ----Include about 15,000 species. * Example: Earthworms, leeches, clam worms. * They all have segmented body divided by septa. * Septa * walls of tissue. * These organisms contain Bristols called Satae. * Satae * They use setae to move, burrow, swim (clam works). * These are worldwide organisms. * These are Detrivore * They feed on dead organic material all the way to parasites. (leeches)
Basic Body Plan * Protosmium- head region, lots of segments. * Pigidium- Tail end. * Body wall has * longitudal muscles (up and down move) * circular muscles (forward and bacwards) * Coeleum- filled with fluids.
Internal Anatomy * Nervous System * Contain cerebral ganglia * Two grey balls w/ ventral nerve cord attached that runs down length of body. * Cerebreal Ganglia also analogues to the brain. * Circulatory System * Ex: Earthworm * Contains 5 hearts called arotic arches and dorsal blood vessels. * Closed system * They contain hemobligin (iron)- carries oxygen * Excretory * Contain Nephrida. (Well developed) * Removes waste from blood and coelum-cavity (Comparably to our kidneys) * Respiration System: * Some breathe via Diffusion. * Some have Parapodia
Reproduction * Varies greatly. * Both monoecious, and Dioceious species.
Classes
Class Polychaeta * Clamworms * All marine about 10,000 species named. * Head region Present. * Contain Parapodia * Paired appendeges * Used for swimming, digging, etc, and respiration. * Well developedsetae (hairs) * They don't contain a citellum * Large part of marine foodchain.
Groups of Polychaeta 1. Sedentary polychaetes a. Don't move alot, lazy in our world. b. live in extreme environments. c. Feathery