Question

Examine an ephyra of Aurelia and compare it with the Medusa of obelia

Answer 1

Tentacles armed with stinging cells (cnidocytes) are a defining trait of the cnidarians, a phylum that includes sea anemones, corals, jellyfish, and hydras. While cnidarian tentacles are generally characterized as structures evolved for feeding and defense, significant variation exists between the tentacles of different species, and within the same species across different life stages and/or body regions. Such diversity suggests cryptic distinctions exist in tentacle function. In this paper, we use confocal and transmission electron microscopy to contrast the structure and development of tentacles in the moon jellyfish, Aurelia species 1. We show that polyp oral tentacles and medusa marginal tentacles display markedly different cellular and muscular architecture, as well as distinct patterns of cellular proliferation during growth. Many structural differences between these tentacle types may reflect biomechanical solutions to different feeding strategies, although further work would be required for a precise mechanistic understanding. However, differences in cell proliferation dynamics suggests that the two tentacle forms lack a conserved mechanism of development, challenging the textbook-notion that cnidarian tentacles can be homologized into a conserved bauplan.

Citation: Gold DA, Nakanishi N, Hensley NM, Cozzolino K, Tabatabaee M, Martin M, et al. (2015) Structural and Developmental Disparity in the Tentacles of the Moon Jellyfish Aurelia sp.1. PLoS ONE 10(8): e0134741. doi:10.1371/journal.pone.0134741

Editor: Robert E. Steele, UC Irvine, UNITED STATES

Received: March 14, 2015; Accepted: July 13, 2015; Published: August 4, 2015

Copyright: © 2015 Gold et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited

Data Availability: All relevant data are within the paper.

Funding: This work was supported by the NASA Astrobiology Institute - Foundations of Complex Life: Evolution, Preservation and Detection on Earth and Beyond. The funder had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Competing interests: The authors have declared that no competing interests exist.

Answer 2

Difference Between Aurelia And  Obelia

Explanation:

• The obelia is a mainly marine species .obelia is a long approx 25 cm as a colony of interconnected polyps.  
• The obelia lives no deeper than the 200 meters from the water of the surface.  
• The sexual stage of obelia is Medusa,and it is commonly known as,the   swimming bell.
• The Ephedra of Aurelia is found in freshwater,hydra is a long approx 30 mm long.  
• Aurelia is known as jellyfish.
• The body of Aurelia is umbrella-shaped.