WebAlthough mollusk body forms vary, they share key characteristics, such as a ventral, muscular foot that is typically used for locomotion; the visceral mass, which contains most of the internal organs of the animal; and a dorsal mantle, which is a flap of tissue over the visceral mass that creates a space called the mantle cavity. WebAug 26, 2010 · Flatworms have three embryonic germ layers that give rise to surfaces covering tissues, internal tissues, and the lining of the digestive system. The epidermal tissue is a single layer of cells or a layer of fused cells covering a layer of circular muscle above a layer of longitudinal muscle.
Platyhelminthes - ScienceDirect
WebFlatworms are bilaterally symmetrical, meaning their bodies have two identical halves. Many flatworms have cilia (movable, bristlelike structures) on their outer surface that aid in locomotion and feeding. Flatworms … WebAnimals may be carnivores, herbivores, omnivores, or parasites ( Figure 15.2 ). Most animals reproduce sexually: The offspring pass through a series of developmental stages that establish a determined body plan, unlike plants, for example, in which the exact shape of the body is indeterminate. The body plan refers to the shape of an animal. check if internal table is empty abap
Planarian - Wikipedia
WebIntroduction to the Platyhelminthes Life in two dimensions. . . The simplest animals that are bilaterally symmetrical and triploblastic (composed of three fundamental cell layers) are the Platyhelminthes, the flatworms. … WebDec 10, 2024 · A protostome, also called Protostomia is a phylum under Kingdom Animalia (animals). They have spiral determinate cleavage, a mouth that develops before the anus in embryos, true tissues, and are... WebApr 3, 2024 · Platyhelminthes (platy = flat and helminth = worm), or simply ‘flatworms’, are dorsoventrally flattened and bilaterally symmetrical worms (Figure 1 A,B).Often speculated in the classic literature to represent primitive basal bilaterians, modern molecular phylogenetic analyses place the Platyhelminthes within the Lophotrochozoa, a clade of … check if integer is null or empty c#