What is a common feature shared by both the roundworms and the arthropods? One of the key features of the lophotrochozoans is that
they have a band of cilia during their larval stage
.
What do nematodes and arthropods have in common quizlet?
-Both nematodes and arthropods have
segmented body plans
. -Both nematodes and arthropods must molt in order to increase in size. … -Arthropods are named for their jointed appendages. -Both nematodes and arthropods possess an external covering, or cuticle.
Which feature is used to identify the Ecdysozoans?
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.
Which feature is not found in the arthropods?
Thus, the correct answer is
Parapodia
which is not present in the Phylum-Arthropoda.
Which is the largest most diverse group of arthropods?
Insects
are the largest group of arthropods but can be distinguished from other arthropods by certain characteristics. Insects have three body regions (head, thorax and abdomen), three pairs of legs and a pair of antennae. One gift most insects have that other arthropods lack is the ability to fly.
What defines ecdysozoa?
The Ecdysozoa is
one of the two large subdivisions within the Protostomia
, a group in which the mouth develops from the first opening to develop in the embryo.
What do all Ecdysozoans have in common?
The most notable characteristic shared by ecdysozoans is
a three-layered cuticle (four in Tardigrada) composed of organic material
, which is periodically molted as the animal grows. This process of molting is called ecdysis, and gives the group its name.
What do arthropods have in common with nematodes?
The nematodes and the arthropods belong to a clade with a common ancestor, called Ecdysozoa. … The ecdysozoan phyla have
a hard cuticle covering their bodies
that must be periodically shed and replaced for them to increase in size.
How are arthropods divided?
The phylum Arthropoda is commonly divided into
four subphyla
of extant forms: Chelicerata (arachnids), Crustacea (crustaceans), Hexapoda (insects and springtails), and Myriapoda (millipedes and centipedes).
Do nematodes have a circulatory system?
Nematode worms are among the most ubiquitous organisms on earth. They include free-living forms as well as parasites of plants, insects, humans and other animals. … While nematodes have digestive, reproductive, nervous and excretory systems,
they do not have discrete circulatory or respiratory systems
.
Which one is present in Arthropoda?
The phylum Arthropoda includes three major classes—
the Insecta, Arachnida, and Crustacea
. Arthropods are characterized by their external skeleton, or exoskeleton, made mostly of chitin, a complex, rigid carbohydrate usually covered by a waxy, waterproof cuticle.
What type of body support is found in arthropods?
The external skeleton of arthropods is a highly efficient system for small animals. The
exoskeleton
provides a large surface area for the attachment of muscles and, in addition to functioning in support and movement, also provides protection from the external environment.
Do arthropods have a closed circulatory system?
Circulatory System Architecture
As opposed to a closed system, arthropods– including insects, crustaceans, and most mollusks– have
an ‘open' circulatory system
.
What lacks a true Coelom?
Simple animals, such
as worms and jellyfish
, do not have a coelom. All vertebrates have a coelom that helped them evolve complex organ systems. Animals that do not have a coelom are called acoelomates. Flatworms and tapeworms are examples of acoelomates.
What is the most diverse group of animals on the planet?
Arthropods
the largest, most diverse animal group.
Which insect is the most diverse?
Beetles
live in a wide variety of terrestrial and freshwater habitats. They are the most diverse group of insects alive today.
