What is the difference between Errantia and Sedentaria?
What is the difference between Errantia and Sedentaria?
A few are parasitic. The mobile forms (Errantia) tend to have well-developed sense organs and jaws, while the stationary forms (Sedentaria) lack them, but may have specialized gills or tentacles used for respiration and deposit or filter feeding, e.g., fanworms.
What do you mean by polychaetes?
polychaete. / (ˈpɒlɪˌkiːt) / noun. any marine annelid worm of the class Polychaeta, having a distinct head and paired fleshy appendages (parapodia) that bear bristles (chaetae or setae) and are used in swimming: includes the lugworms, ragworms, and sea mice.
What is the difference between sedentary worms and errant polychaete?
What are Sedentary Polychaetes? Polychaetes can be separated into two large orders, Errantia and Sedentaria, based on the development of the anterior appendages and life habits. Errant Polychaetes are active swimmer or crawler while Sedentary Polychaetes are burrowers or tube dwellers.
What are the characteristics of a polychaete?
Class Polychaeta
- Metamerically segmented.
- Bilateral symmetry.
- Chitinous setae called parapodia.
- Schizocoelic.
- Closed circulatory system.
- Complete digestive system.
- Respiration through skin, gills or parapodia.
- Nephridia for excretion.
What are the bristles on an earthworm called?
Bristles, called setae, are located on each segment of the earthworm’s body. They prevent the earthworm from slipping backwards.
What is the meaning of oligochaeta?
Oligochaeta (/ˌɒlɪɡəˈkiːtə, -ɡoʊ-/) is a subclass of animals in the phylum Annelida, which is made up of many types of aquatic and terrestrial worms, including all of the various earthworms.
Where are polychaetes found?
Polychaetes are multi-segmented worms living in all environments in the world’s oceans, present from abyssal depths to shallow estuaries and rocky shores, and even free swimming in open water. They are strictly aquatic annelids, but are the most abundant and diverse group of Phylum Annelida.
What does polychaete mean in Latin?
New Latin, from Greek polychaitēs with much hair, from poly- much (from polys much, many) + chaitē long flowing hair.
Are parapodia used for feeding?
segment (peristome) usually has paired parapodia; i.e., fleshy, lateral outgrowths used in feeding, locomotion, or breathing. The parapodia, generally prominent in free-moving polychaetes, bear bundles of setae, which can be extended, and aciculae (needlelike structures), which are used for support.
Why is nereis called a polychaete?
Nereis possess setae and parapodia for locomotion. They may have two types of setae, which are found on the parapodia. Locomotor chaetae arefor crawling, and are the bristles thatare visible on the exterior of thePolychaeta. they are cylindrical in shape.
What is the common name for polychaeta?
paddle-footed annelids
Integrated Taxonomic Information System – Report
| Synonym(s): | Polychaeta |
| Common Name(s): | paddle-footed annelids [English] |
| polychaetes [English] | |
| polychètes [French] | |
| corrupto [Portuguese] |
What characteristics of polychaetes does it lack?
Polychaetes usually have a well-developed head, often complete with well-developed eyes, antennae, and sensory palps. They lack any permanent sex organs (in contrast to other kinds of annelids); gonads appear as swellings during the breeding season.
Which is the best definition of a sedentaria?
Definition of Sedentaria. : a division of Polychaeta comprising sedentary usually tube-dwelling worms with reduced parapodia and sense organs and typically with highly developed filamentous anterior respiratory organs or gills — compare errantia , sabellaria.
What is the definition of a sedentary Polychaeta?
: a division of Polychaeta comprising sedentary usually tube-dwelling worms with reduced parapodia and sense organs and typically with highly developed filamentous anterior respiratory organs or gills — compare errantia , sabellaria.
Which is an example of a sedentary species?
Gregory E. Demas, Adam M. Fudickar, in Encyclopedia of Animal Behavior (Second Edition), 2019 Many sedentary species maintain a territory throughout the year.
How does a sedentary lifestyle affect your health?
A sedentary lifestyle increases your risk of disease. An increased risk for stroke within a family may also be due to common behavioral factors, such as a sedentary lifestyle or poor eating habits. If you’re feeling more sedentary, pick a bar or coffeehouse and become a regular.