How are mollusks and annelids similar?
How are mollusks and annelids similar?
Like mollusks, annelids exhibit protostomic development. Annelids are bilaterally symmetrical and have a worm-like appearance. Their particular segmented body plan results in repetition of internal and external features in each body segment. This type of body plan is called metamerism.
What evidence exists to indicate that annelids and mollusks are closely related?
Both mollusks and annelids remove their metabolic wastes using nephridia. Their blood is pumped by a heart and it is contained by a network of blood vessels. They are coelomates. Both annelids and mollusks have true coeloms between their body tissues.
Do annelids have gills?
In some annelids, including earthworms, all respiration is via the skin. However, many polychaetes and some clitellates (the group to which earthworms belong) have gills associated with most segments, often as extensions of the parapodia in polychaetes.
What does mollusks have in common?
WHAT FEATURES DO MOLLUSKS HAVE IN COMMON? As well as a shell, most mollusks have a muscular foot for creeping or burrowing. Some also have a head with sense organs. The soft body includes lungs or gills for breathing, and digestive and reproductive parts, all enclosed by a skinlike organ called the mantle.
What is the connecting link between Annelida and Mollusca?
Neopilina is a connecting link between phylum Annelida and Mollusca. It is highly derived genus of modern monoplacophoran(class of species annelids and molluscs).
How are mollusks similar to worms?
Similarities between mollusks and segmented worms suggest that they could have a common ancestor. These groups were the first animals to have a body cavity with space for body organs to develop and function. Mollusks and segmented worms have a one-way digestive system with a sepa- rate mouth and anus.
Why are annelids arthropods and mollusks placed in the same clade?
Why are annelids, arthropods, and mollusks placed in the same clade? – They are diploblastic.
How do mollusks breathe?
Aquatic mollusks “breathe” under water with gills. Gills are thin filaments that absorb gases and exchange them between the blood and surrounding water.
What are four characteristics shared by all mollusks?
Some common features are :
- Unsegmented soft body with bilateral symmetry.
- Presence of an internal or external shell.
- A toothed tongue (made mostly of chitin) called the radula.
- A mantle which is a fold in the body wall that lines the shell.
- Muscular foot (and/or tentacles in some).
What is the characteristics of mollusks?
Mollusks are invertebrate animals with soft bodies that are often covered in hard shells. An invertebrate is an animal without a backbone. The three main parts of a mollusk’s body include a muscular foot, a visceral mass, and a mantle. The three main types of mollusks are gastropods, bivalves, and cephalopods.
What is connecting link between Annelida and Arthropoda?
Peripatus is a connecting link between Annelida and Arthropoda.
What is the connecting link between Mollusca and echinodermata?
Peripatus is a connecting link between mollusks and echinodermata.
What are annelids most closely related to?
Annelids and arthropods have long been considered each other’s closest relatives, as evidenced by similarities in their segmented body plans.
Why are annelids arthropods and mollusks placed in the same clade hint it should be something that is most unique to their group?
Do mollusks have blood?
Most molluscs have blue blood because their respiratory molecule is hemocyanin, a type-3 copper-binding protein that turns blue upon oxygen binding. Molluscan hemocyanins are huge cylindrical multimeric glycoproteins that are found freely dissolved in the hemolymph.
Do molluscs have hearts?
Molluscs have an open circulatory system – only part of the blood flow is contained in vessels. Molluscs have a three-chambered heart. Two auricles collect oxygenated blood from the gills, and the ventricle forces it from the aorta into small vessels which finally bathe the tissues directly.
What are mollusks characteristics?
Molluscs (also know as mollusks) are soft-bodied, bilaterally symmetrical, segmented, coelomate animals; usually shelled having a mantle, ventral foot, anterior head, and a dorsal visceral mass.
Which of these is a feature shared by all molluscs?
The features found in most molluscs is that they are unsegmented and bilaterally symmetrical.
How do mollusks differ from other animals?
Although there is no single feature that all molluscs possess, three features are so common in molluscs that they are used to distinguish them from organisms in other phyla: All molluscs have a specialized foot used in digging, grasping, or creeping.
Which of the following is the connecting link between Annelida and molluscs?
neopilina
Connecting link between annelida and mollusca is neopilina.
What are the characteristics of annelids in the phylum Annelids?
The phylum includes earthworms, polychaete worms, and leeches. Like mollusks, annelids exhibit protostomic development. Annelids are bilaterally symmetrical and have a worm-like appearance. Their particular segmented body plan results in repetition of internal and external features in each body segment. This type of body plan is called metamerism.
How are nematodes and Arthropods similar to annelids?
We review their content and use your feedback to keep the quality high. Ans. Similarities: Annelids, molluscs, nematodes and arthropods are all triploblastic, i.e., an animal having a body composed of three embryonic cell layers: the ectoderm, mesoderm, and … View the full answer
Are molluscs and annelids monophyletic?
The resulting tree suggests that the molluscs and annelids form a monophyletic lineage and unites the molluscan taxa to a monophyletic group. Therefore, the result supports the Eutrochozoa hypothesis and the monophyly of molluscs, and indicates early acquisition of segmented body plans in arthropods.
Do Annelids show protostomic development?
Like mollusks, annelids exhibit protostomic development. Annelids are bilaterally symmetrical and have a worm-like appearance. Their particular segmented body plan results in repetition of internal and external features in each body segment. This type of body plan is called metamerism.