CH 18,10: Phylum Gastrochia, Rotifers, Acanthocephalans ect..

Phylum Gastrocha

bottom aquatic feeders

-don’t really know where they fit

-complete digestive tract (acolemate)

-most hemaphodites

Phylum Rotifera

wheel bearers

-mainly freshwater

Rotifer Digestion

complete tract

Rotifer Respiration

simple diffusion

Rotifer Circulation

NONE

Rotifer waste system

pair protonepheria

-bladder

Rotifer Int. Comm

bilobed ganglia

Rotifer Movement

move in an accordion motion

-extend+ move downward

CAN GLUE THEMSELVES DOWN

Rotifer Reproduction

asexual- amitic

sexual- mítico eggs (males live 1-2 days, only to produce sperm)

Amitic

basically clones, no recomb of genes

Phylum Acanthocephala

spiny head worms

Phylum Lorieifra

Marine only,

Function of Pedal Gland

adhere to surfaces helping in feeding and movement

Pseudocoelom

fluid filled body cavity that is not completely lined by mesoderm

Hydrostatic Skeleton

supportive structure that uses fluid filled cavities and muscle contractions to provide shape and support and enable movement

Functional Roles of Nematodes

-mineralize organic matter and release nutrients like nirotgen into plant available forms

-decompose organic matter

Parthenogenesis

“Reproduction without fertilization”

Aschelminths is an artificial grouping

they do not share a recent common ancestor, made by superficial trainers other than evolutionary ancestor

Example of aschelminiths

nematodes