ASB0204 – CRUSTACEANS, CENTIPEDES AND MILLIPEDES

ASB0204 – CRUSTACEANS, CENTIPEDES AND MILLIPEDES


firstly we will begin with the
Crustaceans what is crustaceans crustaceans is derived from their crusty hard
exoskeleton which contains calcium carbonate in addition to the typically
chitin the majority of the crustaceans lived in marine and
aquatic environment the most familiar and numerous crustaceans are decapode
like crabs hermit crabs crayfish and shrimp they have a thorax that bears
Five pairs of walking appendages the gills are positioned above the walking legs the
first pair of walking legs could also act as claws secondly was a copepod copepod and krill are very small
copepod are a free swimming crustaceans that live in the water where they feed
on algae the example of copepod are barnacles barnacles are sessile crustaceans
that have thick heavy protective shell barnacles
Live on wharf pilings ship hulls Seaside rocks and also even on the whale’s body the external anatomy of crayfish are
very unique the important things that we have to know about cryfish are their
respiratory systems green glands nervous systems and their
sexes for the respiratory system That consists of gills that lie above the
walking legs protected by a carapace for the respiratory systems also have a
digestive system that include a stomach which have two parts posterior regions and
interior portions for interior portions that also called gastric mill equipped with chitinous teeth To grind coarse food
for posterior region that acts as a filter to prevent coarse particles from entering the digestive
glands that absorption take place the green glands that’s lying in the head
Region and enterior to the esophagus for for the coelom in the green glands that well
developed in the annelids and is reduced in the arthropods and also composed chiefly
Of the space about the reproductive system a heart pumps hemolymph containing the blue
respiratory pigment hemocyanin into the hemocoel
consisting of sinuses where the hemolymph flows about the organs crayfish has
well-developed member system they have a brain and a ventral nerve cord that passes
posteriorly along the length of the nerve cord the periodic Ganglia give off lateral nerve they also
have well-developed sensory organs their eyes are accurate and can detect motion
and respond to the polarized light statocysts Is serve as organs of equilibrium
the other or the other sensory organs are tactile antennae and chemosensitive
setae lastly in the crayfish the sexes are separate and the gonads are located
Just ventral to the pericardial cavity in the male a coiled sperm ducts
Opens to the fifth walking leg space the spot transfer is accomplished by the
modified of first two swimmerets of abdomen but in the females the ovaries open to
third walking legs space a stiff fold between the bases of the fourth and fifth pairs
serves as a seminal receptacle the eggs are attached to the female swimmeretes the young
hatchlings the young hatchlings are miniature adult and no metamorphosis occurs After that we will be explaining about
Centipedes hundred-leggers and millipedes thousand-leggers i’ll tell you about centipedes
Each centipede body segments has a pair of Walking legs most of the species like to live
in moist environments like under logs in crevices and in leaf litters they are
active predators on worms, small crustaceans And insects the head of centipede
includes mandibles and paired antennae appendages the appendages of the first
trunk segment kill or immobilized Prey and the mandibles chew for the millipedes
Each of four thoracic segments have one pairs of legs while abdominal
segments have two pairs of legs and millipedes live under a stone their
Cylindrical bodies have a chitinous exoskeleton and the important
things have that millipedes have are they have secret hydrogen cyanide as the
poisonous substance that’s all from the all of us see you again thank you

2 thoughts on “ASB0204 – CRUSTACEANS, CENTIPEDES AND MILLIPEDES

Leave a Reply

Your email address will not be published. Required fields are marked *