FISH, AMPHIBIANS and REPTILES

The first steps up the vertebrate ladder!
Aquatic vertebrates (fish) and the first to
transition from water to land (amphibians
and reptiles), able to free themselves from
water by developing amniotic eggs.

FROG ANATOMY & DEVELOPMENT
Amphibians differ from reptiles in having a larval stage. Eggs develop into gill breath- ing larvae which metamorphose into lung breathing adults. 3 pgms. 44 slides, guides.
EPSS-0460X SLIDES
$74.95

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SAVE OVER $27.00 ON 3 SLIDE SET BUNDLE ORDER EP #SS-0460X........$74.95
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FROG DEVELOPMENT Order #SS-0460S........$24.95

Basic anuran embryology; induction and related phenomena. 1O frames and
guide. (Filmstrip order SS-0460F .....$15.00.)

CONTENT SAMPLE: 1 Frogs’ eggs are fertilized externally. As soon as a sperm
enters an egg, a gelatinous envelope appears around the zygote. Seen here is a group of
newly-fertilized eggs. Note that there are two basic parts: The lighter-colored portion (the vegetal
hemisphere) contains yolk material and is denser than the other, darker portion (the animal
hemisphere, destined to become the embryo proper). Freely movable in the gel, the egg “rights
itself” gravitationally. Already at this stage part of the embryo-to-be is distinguishable with special
methods. The gray crescent, an area of cytoplasm on one side of the egg in the animal-vegetal
margin, will play an important role later on in directing embryological changes.
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FROGS AND TOADS Order #406.........$42.50

An introductory survey of these amphibians for the beginning student. Discusses
their morphology, reproduction, growth and development, and presents interesting facts
about feeding and mating behavior. Includes wood, leopard, pig and green frog; bullfrog;
various tree frogs; narrow-mouthed, American, southern and marine toads; eggs and
developing tadpoles. 20 slides and guide.

CONTENT SAMPLE: 9897 This is the largest and most spectacular of our tree frogs,
reaching five inches in length with females larger than males. This is the Cuban tree frog, originally
from the West Indies and Bahamas. Now it has adapted itself to life in South Florida and is so
abundant in some areas as to be considered a pest. It sits on windows at night to catch insects
and makes quite a sloppy mess of a clean window. In color it may be greenish or bronze.

These frogs forage at night, spending their days hiding near moisture in cisterns, drains,
cellars, palm leaves, regularly watered potted plants, etc. Unlike the rest of the tree frogs, this
creature will eat smaller frogs and toads as well as insects.

Like toads, the Cuban tree frog has an irritating skin secretion which can be painful to
ones eyes.

REVIEWS: “...excellent collection of slides and educational materials....This provides
much needed materials.” M.G., Assistant Professor, University of Iowa.
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DISSECTION GUIDE FOR THE FROG Slides order SS-0570S......$34.95

Avoid smelly and controversial classroom dissections and the needless
depletion of wild populations yet still teach biology fundamentals. 14 frames and guide.
(Filmstrip order SS-0570F .......$15.00.)
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~0214-42~ Cuban tree frog (Hyla septentrionalis). photo by Educational Images Ltd.

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