Below the rostrum are two pairs of mandibles (the jaws) and
three pairs
of maxillipeds, which are small appendages that direct food to the mouth.
What is the function of the maxillipeds?
These maxillipeds (or “jaw legs”)
pass food to the masticatory, or chewing, mouthparts of the head proper
. The thoracic segment of the first pair of maxillipeds is usually fused to the head, forming a cephalon.
Two pairs of maxillae hold solid food, tear it, and pass it to the mouth. … Of the eight pairs of appendages on the cephalothorax
What is the abdomen of a crayfish?
The abdomen of crayfish is
located behind the cephalothorax
Are the Swimmerets jointed on a crayfish?
The image shows a female crayfish; in males the first set of swimmerets are enlarged for grasping the female during copulation. … This claw is called the
CHELIPED
, it is also jointed and the crayfish uses it to capture food and for defense.
What is the main function of Swimmerets?
The swimmerets of crayfish serve a function in
posture control
and beat rhythmically when the animals swim forward, ventilate their burrows or females aerate their eggs
5 , 6
.
What are three functions of the Swimmerets?
Tell the students that the swimmerets have three functions. They
help the crayfish swim, they move water over the gills for respiration, and on the female they hold the larva.
What is the function of a crayfish stomach?
| A B | esophagus connect mouth to stomach | stomach process food | digestive gland stores nutrients, tomally | intestine transports waste to anus |
|---|
How many hearts does a crayfish have?
How many hearts does a crayfish have? You have
four
; two right chambers and two left chambers. Your two right chambers are called the right atrium and the right ventricle. The right chambers are blue, standing for deoxygenated blood.
What makes up a crayfish body?
Crayfish are characterized by a
joined head and thorax, or midsection
, and a segmented body, which is sandy yellow, green, red, or dark brown in colour. The head has a sharp snout, and the compound eyes are on movable stalks. The exoskeleton, or body covering, is thin but tough.
How do you tell if a crayfish is male or female?
Males tend generally to be larger in size than females
, with larger chelae and narrower abdomens. Crawfish tails host small appendages, including swimmerets. Male crawfish carry an extra set of these swimmerets, which are enlarged and hardened. Females possess a small hole just behind their swimmerets.
Which part of the crayfish is more flexible?
The abdomen
is flexible and the segmentation is visible here. The appendages of the crayfish attach to both the cephalothorax
What is a crayfish rostrum?
Rostrum:
The long spike that sticks forward from the head between the eyes
. Telson: The middle “panel” of the tail. Uropods: The two pair of “fans” on either side of the telson that make-up the tail, used for swimming. Walking Legs: Limb of a crayfish used for forward motion.
What are the Swimmerets attached to and why?
Tell the students that the swimmerets have three functions. They
help the crayfish swim
, they move water over the gills for respiration, and on the female they hold the larva.
What is the function of Telson?
Crustaceans. In lobsters, shrimp and other decapods, the telson, along with the uropods forms the tail fan. This is used as a paddle in the caridoid escape reaction (“lobstering”), whereby
an alarmed animal rapidly flexes its tail, causing it to dart backwards
.
What does Uropod mean?
As nouns the difference between telson and uropod
is that
telson is the part of an arthropod posterior to the last segment
while uropod is (anatomy) either of the two posterior abdominal appendages of the lobster, shrimp and some other crustaceans.
