WebThese layers are called germ layers. Each layer develops into a specific set of tissues and organs. Animals develop either two or three embryonic germs layers (Figure 15.5). The animals that display radial symmetry develop two germ layers, an inner layer (endoderm) and an outer layer (ectoderm). These animals are called diploblasts. WebNov 6, 2024 · Triploblastic animals have a third layer, mesoderm, which gives rise to muscle and skeletal structures and which surrounds the body cavity. Coelom, the main body cavity in which the intestine is suspended. Surrounded entirely by tissues of mesoderm origin. Acoelomate: The condition of lacking a true coelom.
Biological Diversity 7 - uni-hamburg.de
WebMay 23, 2024 · Rotifera A phylum of microscopic (0.04–2.00 mm) pseudocoelomate aquatic animals characterized by a crown of cilia at the head end. These are used in locomotion … WebThe inner tissue layer (derived from endoderm) secretes digestive juices into the gastrovascular cavity, which digests food and circulates nutrients. ... Rotifers belong to the phylum Rotifera, which contains about 2,000 species. Rotifers are often observed in biology lab preparations. right here waiting for you drums tap
Circulatory System Variation in Animals Biology for Majors II
WebRotifers : the "wheel animalcules". Rotifers are microscopic aquatic animals of the phylum Rotifera. Rotifers can be found in many freshwater environments and in moist soil, where they inhabit the thin films of water … WebRotifera. auricles. A lateral projection which contains nerve endings sensitive to touch and to chemicals. Platyhelminthes. medusa and polyp stages. Two different phases of life. Cndaria. foot. Organ for locomotion or holding a position. Rotifers have a foot attached to their posterior end and it includes a cement gland in a toe. Rotifera WebThe epidermal tissue is a single layer cells or a layer of fused cells (syncytium) that covers a layer of circular muscle above a layer of longitudinal muscle. ... (which contains the corona), a trunk (which contains the organs), and the foot. Rotifers are typically free-swimming and truly planktonic organisms, ... right here waiting for you chords