Other features: solitary individuals with two valves, attached to bottom with pedicle, feed with ciliated lophophore. Other features: solitary individuals, wormlike, living in vertical tubes with lophophore protruding into water above.
Other features: A spiny skin enclosed an internal skeleton of interlocking calcium carbonate plates; feeding and locomotion on tube feet connected to water vascular system; includes starfish or sea stars, sea cucumbers, sea urchins.
Other features: benthic sea squirts have a barrel-shaped body, with incoming and outgoing siphons; tadpole larvae have features allying this group with vertebrates. About the Book. Instructor Resources. Zoology or Animal Biology. Human and Animal Interaction. Study now. See Answer. Best Answer. Annelids such as earthworms have bilateral symmetrical. Study guides. Genetics 20 cards. What are chromosomes made of. How are mitosis and meiosis similar.
What is a gel electrophoresis chamber. In pea plants what are the two alleles for color. Biology 20 cards. Which part of the cell membrane prevents the cell from dissolving in water. What is it called when a molecule uses energy to move across a semipermeable membrane. Why is the phloem in a leaf important to the roots of a plant. What is the name for the protective structure that forms around an embryo. What is the basic unit of a nucleic acid.
Which of the following is an organic molecule. What is the main function of starch in plants. Which type of protein makes up connective tissue. Q: What kind of symmetry do annelids have?
Is a worm radial symmetry or bilateral symmetry? Do annelids have radial or bilateral symmetry? Does Cnidaria show radial symmetry? Why do Cnidaria have radial symmetry? Do Ctenophores have radial symmetry? Does Cnidaria have radial cleavage? Are Bilaterians Diploblastic or Triploblastic?
What are the advantages of radial symmetry? Are echinoderms Bilaterians? Do all Bilaterians have radial symmetry?
What is radial symmetry give an example? Is human body symmetrical? Previous Article Are Go karts manual or automatic? Annelids may be either monoecious with permanent gonads as in earthworms and leeches or dioecious with temporary or seasonal gonads that develop as in polychaetes.
However, cross-fertilization is preferred in hermaphroditic animals. These animals may also show simultaneous hermaphroditism and participate in simultaneous sperm exchange when they are aligned for copulation. Phylum Annelida contains the class Polychaeta the polychaetes and the class Oligochaeta the earthworms, leeches and their relatives. The many chetae of polychaetes are also arranged within fleshy, flat, paired appendages that protrude from each segment called parapodia , which may be specialized for different functions in the polychates.
The subclass Hirudinea includes leeches such as Hirudo medicinalis and Hemiclepsis marginata. The class Oligochaeta includes the subclass Hirudinia and the subclass Brachiobdella. A significant difference between leeches and other annelids is the development of suckers at the anterior and posterior ends and a lack of chaetae. Additionally, the segmentation of the body wall may not correspond to the internal segmentation of the coelomic cavity. This adaptation possibly helps the leeches to elongate when they ingest copious quantities of blood from host vertebrates.
The subclass Brachiobdella includes species like Branchiobdella balcanica sketi and Branchiobdella astaci , worms that show similarity with leeches as well as oligochaetes. Figure 3. The a earthworm, b leech, and c featherduster are all annelids. Phylum Annelida includes vermiform, segmented animals.
0コメント