WebAs previously stated, Obelia has a balanced alternation of generations; both forms are well-developed. Other species or groups of Cnidaria may have one form reduced or nonexistent. In the class Scyphozoa, the medusa stage is emphasized. The polyp stage still thrives, but the reproduction is highly evolved. http://winvertebrates.uwsp.edu/armstrong_361_2012.html
Biology, Biological Diversity, Invertebrates, Phylum Cnidaria
WebJul 6, 2011 · Ten years of experience with Online Learning, Remote Learning, and Professional Development. Currently, I am in the unique … WebDescription of Obelia: 1. It is a branched, fixed colony (Fig 20.12). Some of the horizontal branches anchoring the colony on some support are called Hydrorhiza while other branches are vertical and known as Hydrocaulus. 2. cloud hill baywa
28.2D: Class Cubozoa and Class Hydrozoa - Biology LibreTexts
WebThe class Anthozoa includes all cnidarians that exhibit a polyp body plan only; in other words, there is no medusa stage within their life cycle. ... Obelia, (b) Physalia physalis, known as the Portuguese Man O‘ War, (c) Velella bae, and (d) Hydra have different body shapes but all belong to the family Hydrozoa. (credit b: modification of ... WebApr 9, 2024 · Figure 28.2. 3: The sessile form of Obelia geniculate has two types of polyps: gastrozooids, which are adapted for capturing prey, and gonozooids, which bud to produce medusae asexually. All cnidarians show the presence of two membrane layers in the body that are derived from the endoderm and ectoderm of the embryo. WebHydrozoa (hydrozoans; from Ancient Greek ὕδωρ (húdōr) 'water', and ζῷον (zôion) 'animal') is a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water.The colonies of the colonial species can be large, and in some cases the specialized individual animals cannot survive outside the … by 文章