What is the defining characteristic of the Ecdysozoan phyla?
The most distinguishing and prominent feature of Ecdysozoans is their cuticle: a tough, but flexible exoskeleton that protects these animals from water loss, predators, and other aspects of the external environment. All members of this superphylum periodically molt or shed their cuticle as they grow.
What characterizes an Ecdysozoan quizlet?
What characterizes an Ecdysozoan? They all grow by molting.
What do all ecdysozoans have in common?
The most distinguishing and prominent feature of Ecdysozoans is their cuticle: a tough, but flexible exoskeleton that protects these animals from water loss, predators, and other aspects of the external environment. All members of this superphylum periodically molt or shed their cuticle as they grow.
How do Ecdysozoa grow?
Ecdysozoans are a morphologically heterogeneous group of animals which have a cuticle and grow by molting and include the arthropods and nematodes.
Which of the following are two morphological features found in the Lophotrochozoa clade?
Which of the following are morphological features that unify organisms found in the Lophotrochozoa clade? The presence of a larval stage with a band of cilia around its middle. The formation of a crown of tentacles used for feeding.
Why are Ecdysozoa so diverse?
The Ecdysozoa are the most diverse group of organisms on the planet, especially because they contain the insects, and particularly the beetles, the largest and most diverse group of all organisms.
Which of the following traits is not characteristic of phylum Arthropoda?
Thus, the correct answer is Parapodia which is not present in the Phylum-Arthropoda.
Why are insects considered ecdysozoans?
The name Ecdysozoa refers to the fact that many members of this group regularly shed their cuticle, a process called ecdysis that is controlled hormonally by a class of steroids appropriately called ecdysteroids.
Which statement about ecdysozoans is true?
Which statement about ecdysozoans is true? All possess a cuticle, and their Hox genes indicate they are monophyletic. Which group of arthropods has the most body segments? efficiently exchange gases.
What groups are ecdysozoans?
Ecdysozoa (/ˌɛkdɪsoʊˈzoʊə/) is a group of protostome animals, including Arthropoda (insects, chelicerata, crustaceans, and myriapods), Nematoda, and several smaller phyla. They were first defined by Aguinaldo et al.
Why do Ecdysozoa shed?
A new exoskeleton is then secreted by the epidermis, but is soft until the remains of the overlying old cuticle are shed at ecdysis. The new cuticle then expands and hardens. In nature, this process appears simple only because ecdysozoans are experts at molting.
What three characteristics of arthropods have contributed to their success?
In brief, these attributes include an exoskeleton, small body size, the ability to fly, a high reproductive potential, complete metamorphosis, and adaptability in an ever-changing environment.
What is the key characteristic for organisms found in clade Lophotrochozoa?
Most organisms placed in the superphylum Lophotrochozoa possess either a lophophore feeding apparatus or a trochophore larvae (thus the contracted name, “lopho-trocho-zoa”). The lophophore is a feeding structure composed of a set of ciliated tentacles surrounding the mouth.
What are the key unifying characteristics of organisms in clade Lophotrochozoa?
The lophotrochozoans are triploblastic and possess an embryonic mesoderm sandwiched between the ectoderm and endoderm found in the diploblastic cnidarians. These phyla are also bilaterally symmetrical, meaning that a longitudinal section will divide them into right and left sides that are symmetrical.
Do members of Ecdysozoa have bilateral symmetry?
The molting animals In turn, the Protostomia belongs to a larger group within the Animalia called the Bilateria, because these animals are bilaterally symmetrical, with a left and a right side to their bodies.
What are the main characteristics of Arthropoda?
The important characteristics of arthropoda include:
- They possess an exoskeleton.
- They have jointed appendages.
- Their body is segmented.
- They are bilaterally symmetrical.
- They possess an open circulatory system.
Which one is the characteristic feature of Phylum Arthropoda?
presence of flame cells. presence of jointed appendages. presence of unjointed appendages.
Which of the following accurately describes the coelom in mollusks?
Which of the following accurately describes the coelom in mollusks? It is highly reduced. It is in spaces around the excretory organs, the heart, and part of the intestine.
Why are nematodes called ecdysozoans?
Both the nematodes and arthropods belong to the superphylum Ecdysozoa that is believed to be a clade consisting of all evolutionary descendants from one common ancestor. The name derives from the word ecdysis, which refers to the shedding, or molting, of the exoskeleton.
Do all Ecdysozoa molt?
The Mechanics of Molting A new exoskeleton is then secreted by the epidermis, but is soft until the remains of the overlying old cuticle are shed at ecdysis. The new cuticle then expands and hardens. In nature, this process appears simple only because ecdysozoans are experts at molting.
What is the characteristics of an arthropod?
All arthropods posses an exoskeleton, bi-lateral symmetry, jointed appendages, segmented bodies, and specialized appendages. The major arthropod classes can be separated by comparing their number of body regions, legs, and antennae.
What characteristics best describe arthropods?
The important characteristics of arthropoda include: They possess an exoskeleton. They have jointed appendages. Their body is segmented.
What does Lophotrochozoa include?
Lophotrochozoa is a monophyletic group of animals that includes annelids, molluscs, bryozoans, brachiopods, platyhelminthes, and other animals that descended from the common ancestor of these organisms. Lophotrochozoa is one of the three major clades that comprise bilateral animals, or Bilateria.
Which description best fits the Lophotrochozoa?
Which description best fits the lophotrochozoa? ( ) As embryos they have three germ layers that will develop into the organ level of organization as adults. ( ) As embryos they have two germ layers that will develop into the tissue level of organization as adults. ( ) Lophotrochozoa are deuterostomes.
What are the characteristics of animals classified under Lophotrochozoa?
These animals lack a calcareous shell but possess aragonite spicules on their epidermis. They have a rudimentary mantle cavity and lack eyes, tentacles, and nephridia (excretory organs). Members of class Monoplacophora (“bearing one plate”) posses a single, cap-like shell that encloses the body.
What defines Lophotrochozoa?
Lophotrochozoa is a monophyletic group of animals that includes annelids, molluscs, bryozoans, brachiopods, platyhelminthes, and other animals that descended from the common ancestor of these organisms. Lophotrochozoa is one of the three major clades that comprise bilateral animals, or Bilateria.
What is the difference between Ecdysozoa and Lophotrochozoa?
What is the difference between Lophotrochozoa and Ecdysozoa? Ecdysozoans have the ability to shed their exoskeleton several times throughout their life span, whereas lophotrochozoan are the animals who possess a trochophore larvae and a feeding structure called lophophore.
What do all lophotrochozoans have in common?
The lophotrochozoans are triploblastic and possess an embryonic mesoderm sandwiched between the ectoderm and endoderm found in the diploblastic cnidarians. These phyla are also bilaterally symmetrical, meaning that a longitudinal section will divide them into right and left sides that are symmetrical.
What are 5 characteristics of arthropods?
All arthropods share these characteristics:
- Exoskeleton. An exoskeleton is the supporting structure on the outside of the body of an arthropod. …
- Segmented bodies.
- Jointed appendages such as mouthparts and antennae.
- Bilateral symmetry. …
- Dorsal blood vessel.
- Ventral nerve cord.
What two characteristics do all arthropods have?
Characteristics of arthropods include:
- A segmented body (Figure below) with a head, a thorax, and abdomen segments.
- Appendages on at least one segment. …
- A nervous system.
- A hard exoskeleton made of chitin, which gives them physical protection and resistance to drying out.