Lecture 9 Flashcards
Phylum Annelid
What are protostomia?
Protostomia are a group of animals that includes the first great lophotrochozoans with trochophore larvae.
What is the common name for Phylum Annelida
Ringed worms or bristle worms.
What are setae in annelids?
Setae are little bristles found in annelids, used for locomotion.
What are the common habitats for annelids?
Marine, freshwater, and damp terrestrial environments.
What are the feeding types in annelids?
Free-living, symbiotic, parasitic, deposit feeders, predators, suspension feeders, and blood feeders.
Do annelids have an open or closed circulatory system
Closed circulatory system, with blood contained within blood vessels.
What is metamerism in annelids?
The body is composed of repeated units separated by septa, and each unit contains components of most organs.
What is the role of the coelom in annelid locomotion
The coelom acts as a hydrostatic skeleton, supporting body movements.
What are the two main muscle types involved in annelid locomotion?
Longitudinal muscles (shorten and expand the body) and circular muscles (narrow and lengthen the body).
What are parapodia in annelids?
Paddle-like “feet” used for swimming, crawling, sensory functions, and respiration.
What are the synapomorphies of annelids?
Groove palps, nuchal organs, bicellular eyes, metameric body, paired epidermal setae.
What are the two classes in Annelid phylogeny?
Class Errantia and Class Sedentaria
What is the main characteristic of Class Sipuncula?
Sipuncula (peanut worms) are not segmented, lack setae, and have ciliated introverted feeding tentacles.
What are the defining features of leeches (Family Hirudinidae)?
Leeches are flattened, have a fixed number of segments, reduced features like setae and septa, and are often blood-sucking or carnivorous.
What is unique about the reproduction of oligochaetes?
They are simultaneous hermaphrodites and have direct development (no trochophore larvae).
