Saturday, May 2, 2026

Vertebrate

  







O  S  T  R  A  C  O  D  E  R  M


J  A  W  L  E  S  S     F  I  S  H


We have to go back 450,000,000 years to find

our first sign of an animal having a vertebra, or a

close likeness.  Prior to that there were plenty

of jellyfish populating the oceans as well as 

assorted animals of the kind you find in tidepools.


The earliest vertebrate species were simple

in plan and may have looked like oversize worms

wiggling through water.  The specimen above has

two dorsal fins to stabilize the animal, behaving much

like a sailboat's keel to keep it upright.

The animal leads with its armored head, 

flattened and taking the shape of a shovel blade.


The eyes are new, as is a distinct and enlarged

neural center that becomes the individual's brain.

The mind discovers light, quickly learning it is

the best and most reliable source for information,

far more than either touch or smell delivers.

Now the animal can identify something from a 

distance, know its size, its headed direction

and know whether it is food or foe.

 

  

   

 



P  L  A  C  O  D  E  R  M


30,000,000 years later and we enter the

Devonian Period - The Age of Fishes.

The basic body plan of a fish is revealed

with the Placoderm.  The name means 

Plated Skin in Greek, referring to the animal's

armored head.  Vertebrates now have a

lower jaw and with it, the ability to bite

like a true carnivore, capturing its prey using

fangs.


Then, after 60,000,000 years of life's further

development, a global environmental catastrophe

occurs, killing off most living species on Earth.

The Placoderms disappear from the fossil record.

 

 





S  H  A  R  K


 20,000,000 million years have passed.

The land is now covered in thick forest.

This time of great plant abundance is 

know as the Carboniferous Period, a later

source for stored energy in the form of

its buried oil, coal and natural gas.  

The first animals capable of dwelling on land

would find these vast forests a never-ending 

buffet.

 

Sharks appear in the fossil record.

Their skeleton made of cartilage makes them

lighter, faster and more maneuverable than bony fish.

The shark pictured above sports an anvil-shaped,

front dorsal fin.  Its bulk hinders swimming but

the flat-head fin is a male display device important

in courtship.

   

 





A  C  A  N  T  H  O  D  I  I


S P I N Y    F I N N E D    F I S H


 Every fin attaches to a spine, except for the tail.

Its skeleton is cartilage but the head is bone.

Bone makes for a stronger helmet.

Cartilage is used to boost performance while

bone provides strength for protection.

How is it the two separate developments of

cartilage and bone, manage to combine

in one group of vertebrates?


The spiny finned fish succeeded for millions of years.  

It ended with an environmental catastrophe that destroyed

most of life on Earth.  The spiny-finned fish were swept

from the fossil record along with the placoderms.

 

 

  




 O  S  T  E  I  C  H  T  H  Y  E  S


 M O D E R N     B O N Y     F I S H


 Over 95% of all vertebrate species 

in existence today are fish.  They are found

most everywhere life can exist.  Fish have

an exceedingly adaptable genetic makeup.

Some notable features:


MGills for respiration.  Exchanging gases

with the surrounding water.  They can't breathe

without water constantly moving over the gills.

A shark must continually swim in order to breathe.

A modern fish has an operculum, a bony gill cover

that flaps while the fish is hovering, enabling the 

animal to breath while standing still.


ESwim Bladder for buoyancy.

It gives the fish neutral buoyancy, enabling it to

hover in the water and not sink.  It is a thin walled,

gas-filled sac that has proven highly adaptive.

Some species of fish that live in stagnant ponds

are able to supplement their gills  with using their 

swim-bladder for respiration when water becomes

oxygen deprived.  Lungs replace gills for respiration

as the fish's gas bladder fulfills a new purpose.


INostrils for smelling, only.

As yet they have no roll in breathing.

They are sensors that detect chemical cues

in the water for feeding and navigation.

This is a vital sensory organ behind the salmon's

remarkable journey home to the stream of their birth

for the purpose of reproduction.

 






 A  C  T  I  N  O  P  T  E  R  Y  G  I  I


R A Y  -  F I N N E D     F I S H


 Fins supported by thin, bony rays provides for

superior responsiveness and overall performance.

The design is powered by competition and 

responses to continuing environmental changes.


Somehow the code to life was written.

It's instructions have been coded in molecular

verse and passed from individual to individual

for hundreds of millions of generations now.


The mystery only deepens with the additional

knowledge we gain.  It's a principle of science.

 


*   *   *   *   *





©  Tom Taylor







 

OVER   EASY

 

 

coldValentine




Saturday, April 25, 2026

Fish

  







K  E  L  P       B  E  D  S


 A forest worth of marine plantlife provides a nutrient-rich

habitat for hundreds of species tied to the ocean.

Thick kelp runs deep to its seabed roots, continuing on

for many miles, hugging the continental coastline.

The water, weighted with life, drags down the energy 

of currents and storm surf, protecting the land

against erosion.


Here is our self-sustaining community of animals.

Otters bob on the surface, crushing shellfish while

seals dart about for rockfish and salmon, and

octopus linger nearby.  Overhead - pelicans, terns

and gulls.







 A  N  G  L  E  R  F  I  S  H


 The Seadevil lives in a bizarre world 4,500 feet

beneath the ocean's surface.  It is a realm virtually

void of light.  The pressure of this depth is enough

to quickly crush a modern submarine.  And yet,

here life exists.  


The creature above is called an anglerfish

because it has a rod and lure sprouting from the

top of its head.  The lure's bioluminescent light

attracts curious inhabitants to their doom;

gobbled up by an enormous mouth armed with

needle teeth, and forced into a stomach that 

handles most anything that fits into its mouth.

The anglerfish can swallow something its own

size in one gulp.


Down here you don't often get an opportunity

for a meal.







 L  A  M  P  R  E  Y


Had you a ticket to ride 500 million years back

in time you would undoubtedly find many fish 

such as this in the oceans of its time. 

A couple billion generations later here are their

offspring, a living fossil. Today they live on the

fringe of fish diversity as jawless parasites.

No jaw, no bite.  You nab your prey with a

suction cup for a mouth.  Your thorny tongue

creates a nourishing open wound.


Here's a free ride.

So you stick around.

 

 





 F  L  O  U  N  D  E  R


Here is a flatfish having both eyes on the same

side of the head.  One eye migrates to the other

side early in its development.  Why not just have

both eyes born on the same side?  Probably because

larva are just trying to survive and they need to see

everywhere.  The adult hides beneath sand, his eyes

are all that appears above the surface.

They look like gravel.  Maybe a bit too...

crunch.  You're dead.


Plus the flounder is like a chameleon -

it changes color to match its surroundings.

If you're a small fish or crab happening by,

you're going to get eaten.  







 F  L  Y  I  N  G       F  I  S  H


We start with a very fundamental fish design -

streamlined torso, tailfin, doral fin and so on.

Nearly all fish design begins with this.

The scenario leading to this biological variation

involves how to escape a barracuda, a predator

hot on your tail and faster than you. 

Go where it can't.  The air above.


If you can reach a speed of 35 mph you can

clear the water's surface.  You then fan out your

enormous pectoral fins and glide some 600 feet,

out of reach of the pursuing barracuda.


Six hundred feet.

The Wright brothers' first flight was only 

one hundred and twenty.







 S  E  A  H  O  R  S  E


Must be the product of a coral habitat.

Exotic.  Colorful.  A real animation feature

for the family until we find out dad is pregnant.

Not to worry, though.  It happens all the time.

When the female finds her eggs fertilized 

she passes them into the male's brood pouch.

Here they are nurtured the next two to four weeks.

 Once the brood is hatched the process starts 

over again.  Mom presents dad with a new batch

of eggs to fertilize.


 


*   *   *   *   *





©  Tom Taylor







 OVER   EASY



coldValentine





Saturday, April 18, 2026

Primate

  







 T   A   R   S   I   E  R


 This animal moves at night and it is the only primate

that is a one hundred percent meat eater - insects,

small lizards and birds.  It can leap more than fifteen

feet from branch to branch and its eyes are literally

bigger than its stomach.  The eyes are so huge they

completely fill their sockets.  


Like the owl, the Tarsier compensates for the eye's

immobility by being able to rotate their head almost

180 degrees in either direction.  Also, Tarsiers have

created a new tool for personal defense.  They 

vocalize with one another above dog whistle frequency.

 We can't hear their chatter.  No sound to follow.

Quiet and tiny.  The world's smallest primate. 

Slightly larger than your morning mug for coffee.


It's easy to surmise that the first primates may have

been similar to this, living in trees much like squirrels.

Maybe, but true or not the Tarsier of today is far more

sophisticated than its predecessors millions of generations

back in time.







 R  I  N  G  -  T  A  I  L  E  D       L  E  M  U  R


 A highly social primate native to the large African

island of Madagascar.  They travel in "troops" of up

to thirty individuals, with females dominating every

aspect of life.  Somewhere along the path of animal

development the female's  role began expanding

beyond giving birth to running everything. 


We find matriarchal societies all through the

animal world.  With the insects, males are a

mere tool for providing genetic diversity.  For

the female, the male is simply sex and a meal.

Once the eggs are fertilized the male is quickly

consumed, providing the young valuable protein 

for which to grow.


The factors leading to matriarchal society in

larger animals are probably shared across species.

Elephants, lions and ring-tailed lemurs - all matriarchal.

What factors determine gender role?

Here's where your scientist enters the story.


Observation comes first.  Grab your notepad and

follow your subject around for the next two years.

Then analyze all your gathered information to

arrive at a possible explanation.  Your reasoning

now provides the basis for your hypothesis.


The next step is to create a test that will determine

the validity of your theory.  Once completed,

a description of your chosen methods and 

your resulting conclusions are published

in a reputable scientific journal for review

by colleagues in your field of study.

They render judgment on your claims.

To what degree did your research

advance the education of humanity?


This is the basis for building scientific knowledge.







 P   R   O   B   O   S   C   I   S       M   O   N   K   E   Y


 This monkey from Borneo stands apart from all

other primates because of the male's long,

drooping nose.  Females apparently favor 

large nosed males.  The bigger schnoz 

indicates a more robust body with larger

testicles and a presumed higher sperm count.

Sounds like speculation based on observation.

Let's make it our hypothesis.


The large nose provides space for an echo 

chamber, amplifying the male's honk! to

a volume that penetrates the surrounding

dense jungle.  That is fact.

And a bit of humor beyond the reason.







 M   A   N   D   R   I   L   L


 Best dressed monkey.  The most colorful, anyway.

They live in dense tropical rainforests, along with 

birds hopping about the jungle canopy, displaying

their own flamboyant and brilliant plumage.

They are all males needing to be seen

despite the thick, stifling vegetation all about.

The jungle can also be filled with plaintive love

calls in the languages of many different species.

It's like Times Square, New Year's Eve...

it's tough getting noticed.


Mandrills lay their colors out thick.

Bright blues and reds do the trick with females.

The more color you have on your face and rump,

the more distinguished you look to the ladies.

It is alleged that your social ranking determines

the intensity of your color.  The higher your rank

the brighter your colors.  Similarly, you fade in 

color as you lose status.


  Arriving at doormat you find your colors drained

to beige.







 G   O   R   I   L   L   A


 Silverback, the dominant male, oversees

the family, but mainly in the role of protector.

The male's chest-beating is meant as a warning.

It is better to ward off your adversary than to risk

a vicious scrap.  You can't afford serious injury

with no one around to tend to your wounds.


Koko was an ape raised in captivity.  During this 

time she built a vocabulary of over two thousand

words using the American Sign Language for the 

deaf.  With these words she was able to convey 

complex emotions, such as grief.


There is a belief among some primate researchers

that gorillas have a consciousness of death

that is similar to what human's experience.

How would you go about testing that hypothesis?

Is a valid test even possible?







 C   H   I   M   P   A   N   Z   E   E


 The thinker.  Life is deeply emotional.

Family dynamics.  Social status.  Compassion.

Lending a helping hand.  Determined enemy.

A war between rival chimpanzee groups involves

ruthless killing until one side or the other is eliminated.


People find them cute as juveniles.  

Their charm is mostly gone once they reach

adulthood and become more as nature intended.

They become an animal named Spartacus, 

demanding respect.  


They aren't stupid.  They use rocks for

hammers, twigs to fish for termites, use chewed

plant to salve their wounds, and eat bitter fruit to

ward off nasty parasites.


They also have strong family values.




*   *   *   *   *





©  Tom Taylor






 

 OVER   EASY

 

 

coldValentine




Sunday, April 12, 2026