Transcript ppt
Hydra (whole mount) Cl. Hydrozoa, A-tentacle, B-hypostome, C-body column, D-basal disc Hydra (longitudinal section; 234K) Cl. Hydrozoa A-mouth, Bhypostome, Cgastrovascular cavity, D-epidermis, Emesoglea, Fgastrodermis Hydra (cross section; 259K) Cl. Hydrozoa A-epidermis, B-mesoglea, C-gastrodermis, Dgastrovascular cavity Hydra (cross section, higher power; 256K) Cl. Hydrozoa A-mesoglea, B-gastrodermis, C-epidermis, D-nematocysts in cnidocytes; outer body surface is to upper left Hydra Locate: gastrovascular cavity, gastrodermis, epidermis, mesoglea cs ls Hydra Locate: epitheliomuscular, gastrovascular cavity, gastrodermis, cnidocytes, mesogloea cs ls Hydra cs ls Hydra ls Hydra Hydra cs Hydra with developing ovaries Hydra with ovaries and buds Single ovary, which is a swelling in the epidermis occupied by a large oocyte filled with dark yolk granules Testis (three in total were visible in this cross-section of the column) filled with hundreds of tiny sperm cells Hydra with developing testes (spermaries) Sexual egg Young polyp female sperm male Budding Hydra Asexual Hydra Nerve Net neuri neuro te n Annulus (branched upright stem) Feeding polyp Reproductive polyp medus ae Pennaria Aurelia Commercially prepared slide of a planula larva. The planula is an ovoid gastrula with a blastopore at one end. You should be able to distinguish between the outer ciliated ectoderm and the inner endoderm. Rhopalium of Aurelia Rhopalium Rhopalium of Aurelia Rhopalium Rhopalium Cassiopeia - Upside Down Jellyfish • Note purple vesicular appendages – flattened, elongate, club-shaped – May be distally birfurcated – Many sizes – Open into the brachial canals • Number, size, and color vary with sex and age • Function is not well understood. Aboral surface is concave and resembles a large sucker. This suction assists the animal in maintaining contact with the substratum. With it the jellyfish can remain in place on smooth vertical surfaces as you have observed in the aquarium. Metridium Metridium Oral surface of the sea anemone showing the tentacles, mouth and siphonoglyphs. Cross section through a Metridium looking towards the oral opening shows complete and incomplete septa. Detail of the oral opening of the sea anemone showing the position of the siphonoglyphs. Internal anatomy of the sea anemone - showing the body wall Cross section through the middle of a sea anemone- Shows complete and incomplete septa. Cross section through a Metridium looking towards the basal disc - shows complete and incomplete septa. Longitudinal section of a sea anemone showing the internal anatomy Internal anatomy of the sea anemone showing the pharynx and the acontia attached to the base of the cavity Internal anatomy of the sea anemone showing the acontia Mesoglea siphonoglyphs Metridium- Cross section of the anemone, slide, showing the body wall incomplete septa and trilobed ends.