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A few have secondarily lost their limbs (snakes and glass lizards)

Have a protective skin covered with reptilian scales of epidermal origin made from keratin - prevents water loss and slows dehydration rates

Found in essentially all habitat types

Claws usually present on the ends of the digits

Have an amniotic egg - the developing embryo is surrounded by an amnion which contains the watery amniotic fluid

Shells also present to protect the egg

All have internal fertilization accomplished by a copulatory organ

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Known as “warm-blooded,” regulating their own body temperate which allows them to live in almost every climate on Earth.

Have hair on their bodies.

Produce milk to feed their babies. This allows them to spend more time with their young and teach them important skills they need to survive on their own.

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The dorsal side is dark grey or black with a violet tint.

On the light grey belly there are a set of light-producing organs helping the shark to see in deep waters.

The nose is long and rounded. As most dogfish sharks

Have two dorsal fins, each with a distinct spine on the leading edge.

All dogfish sharks lack an anal fin.

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A single row of large thorns run along the center of the back, all the way to the dorsal fin.

The coloration is usually dominated by small brown, green or beige spots.

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Have no swim bladder.

Have more than one pair of gills.

A rigid dorsal fin and several series of teeth are other common features.

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1. Body is usually spindle shaped, with four divisions: head, neck, trunk, and tail,

2. Limbs are paired; forelimbs usually modified for flying; posterior pair variously adapted for perching, walking, and swimming; foot with four toes (two or three toes in some)

3. Epidermal covering of feathers and leg scales.

4. Fully ossified skeleton with air cavities; skull bones fused with one occipital condyle; each jaw forms a beak with no teeth.

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Have elongated bodies, encased in bony rings.

Bodies seem stiff.

Trust their camouflage rather than their ability to escape from dangerous situations.

Standing in a vertical position they are easily mistaken for the stem of a plant.

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Live close to the bottom.

Not the best of swimmers

Often prefer to lurk on their prey from crevices or other hiding spots.

They have spiny rays in their dorsal fins.

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Slender

Have ventral fins placed far back on the body and a forked tail.

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Live close to the bottom

When the larvae transform into small fishes, one of the eyes moves to the other side of the head.

A right eyed flounder ends up with the eyes on the right side when the fish is placed upright with the mouth down.

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One of the dorsal spines resembles a fishing pole.

Some of the deep sea anglerfish even have a light in the end of the pole used to attract small fish close to the enormous mouth.

When the mouth is opened the fish is simply sucked in.

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Have different bright colors and very long, dorsal rays.

The body form varies: some are shaped like long ribbons, others more like circular disks.

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Tmall, less than 6 cm.

Behind the head is a sucker that has replaced the pelvic fins.

The sucker is used to cling to smooth surfaces, like rocks or shells.

The skin is smooth and scale-less.

The head is flattened

The dorsal fin is small.

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Have no scales

Have the isolated spines in the dorsal fin.

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The breast fin is positioned behind the ventral fin.

Sensitive beard to sniff around in the gravel.

The center of gravity is sometimes positioned close to the head.

Others have the center of gravity further back and a body shape designed for speed and a pelagic life.

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The ventral fin is usually positioned well behind the breast fin.

The tail fin is deeply forked.

Lack a lateral line.

The body are usually very streamlined and build for high speed swimming.

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Have long, slender bodies.

The length of fully grown individuals ranges from 5 cm to 4 meters.

Lack ventral fins

Have no breast fins.

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The fins are supported by rays.

Have a rigid skeleton

The swim bladder maintains buoyancy as they move up or down in the water.

A gill cover is used to pump water through the gills, enabling the bony fish to breathe without swimming.