NettetThe major difference is which opening to the digestive system forms first. Protostomes= Mouth. Deuterostomes = Anus) For each group, know its basic traits and examples of that type of animal: a) Sponges Nettet3. apr. 2024 · Platyhelminthes and Aschelminthes are major invertebrate phyla of the Kingdom Animalia. Platyhelminthes are acoelomates while Aschelminthes are pseudo …
Chapter 17 - Phylum Annelida Flashcards Quizlet
NettetHow do polychaetes differ from other annelids? They have a well-developed head and no clitellum Polychaete prostomium -Head -May be retractable -Eyes, tentacles, sensory palps Polychaete peristomium -1st true segment of the animal's body -around the mouth -setae, palps, jaws -part of prostomium Polychaete parapodia -Paired appendages NettetSponges may be sequentially hermaphroditic, producing eggs first and sperm later. Eggs arise from amoebocytes and are retained within the spongocoel, whereas sperm arise from choanocytes and are ejected through the osculum. Sperm carried by water currents fertilize the eggs of other sponges. surgical repair of tapvr
How Do Platyhelminthes Differ From Annelids? - FAQS Clear
NettetAnnelids have a simple brain organ consisting of a pair of nerve clusters in the head region (Fig. 3.49). Nerves link the brain to sensory organs in the head that detect the environment in front of the worm. Earthworms are eyeless, but polychaete annelids have eyes that … Nettet8. jun. 2024 · Phylum Platyhelminthes is composed of the flatworms: acoelomate organisms that include many free-living and parasitic forms. Most of the flatworms are classified in the superphylum Lophotrochozoa, which also includes the mollusks and annelids. The Platyhelminthes consist of two lineages: the Catenulida and the … NettetIn fact there are many different types of worms and sometimes the only thing they have in common is that vermiform shape. This is particularly true of platyhelminthes (flatworms), nematodes (round worms) and annelids (segmented worms). Let’s begin with the most primitive group, the flatworms. surgical repair of the anus