Concept Map of Cnidaria

Concept Map of Cnidaria

Protostome or Deuterostome?

More on Antaomy

Body Structure and Organization

Embryonic Development

Major Developmental Features

Research on Jelly fish anatomy

Cnidaria (jellyfish, coral, sea anemones)

The greatest of predators

Origin and discovery

Body Systems

Evolutionary Significance

References

Concept Map

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Concept Map

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Digestive System: A single-opening, gastrovascular cavity that performs both extracellular and intracellular digestion and distributes nutrients. Other Systems: No specialized circulatory, respiratory, or excretory systems; all these functions occur via direct diffusion. Reproduction: Capable of both asexual reproduction (budding in polyps) and sexual reproduction (via gametes in medusae). Life Cycle: Many exhibit alternation of generations, switching between a sessile polyp and a free-swimming medusa.

" Setting unrealstic body standards since the beginning of time"

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From Nothing to something!

A cnidarian begins life as a single fertilized cell. This cell divides to form a hollow ball of cells. Then, one side of the ball folds inward, creating a pouch with two layers: an outer skin and an inner stomach lining. The opening where this folding happened becomes its mouth, which also serves as its anus. The result is a simple, two-layered animal.

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A silent killer

• Predatory Adaptation: The evolution of the cnidocyte (stinging cell) was a revolutionary adaptation. This specialized cell, unique to the phylum, allowed early animals to become active predators, capturing prey much larger and more complex than themselves. This shifted ecological dynamics in the early oceans.

The body parts are arranged around a central oral-aboral axis, like the spokes of a wheel. This is an adaptation for a sessile or floating lifestyle, allowing them to interact with the environment from all directions.

Cnidarians are diploblastic, meaning their bodies are composed of two primary tissue layers: an outer epidermis and an inner gastrodermis. Sandwiched between these layers is the mesoglea, a non-living, jelly-like substance that provides support and structure; in jellyfish, this mesoglea is exceptionally thick and makes up most of their body mass. Furthermore, cnidarians are acoelomates, as they lack a fluid-filled body cavity, with the mesoglea occupying the space between their gut and body wall. Finally, their body plan shows no signs of segmentation, contributing to their overall structural simplicity.

Symmetry: Radial Symmetry.

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Radial Cleavage: The characteristic pattern of early cell division. Diploblastic Organization: Development of only two primary germ layers (ectoderm and endoderm). Planula Larva: The ciliated, free-swimming larval stage that emerges from the embryo. This planktonic larva disperses before settling on a substrate and metamorphosing into a polyp.

Anatomy of Jellyfish

Gelatinous Body with a "Living Skeleton": A jellyfish is up to 95% water. Its structure is maintained by a thick, jelly-like substance called the mesoglea. This isn't just filler; it acts as a buoyant, hydrostatic skeleton, providing support without bones or heavy tissues, allowing for effortless floating.

Cnidarians are evolutionarily significant as the first animals to develop tissue-level organization, a nervous system, and muscles and sensory organs, representing a major step in the complexity of life and serving as a "crossroad" in animal evolution. Their radial symmetry and body plan provide insights into the ancestral state of Metazoa and the development of key animal characteristics, making them valuable model organisms for studying the origins of genetic control and body development

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When were they discovered?

The phylum Cnidaria was named and classified by Carl Hatschek in 1888. Although the name is from 1888, the creatures within the phylum have a long fossil record, with origins tracing back to the Neoproterozoic Era and fossils appearing in the Ediacaran Period around 580 million years ago.

Protostome or Deuterostome?

The animal family tree has two main branches for complex animals: one where the first gut opening becomes the mouth (protostomes), and another where it becomes the anus (deuterostomes). However, cnidarians like jellyfish and corals are on an older, simpler branch of the tree that existed before that split even happened. Because of this, they don't follow either of those rules. They develop a single opening that simply becomes their mouth.

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• Plan the structure of your communication.
• Prioritize it and give visual weight to the main points.
• Define secondary messages with interactivity.
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• Measure the results.

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• Plan the structure of your communication.
• Prioritize it and give visual weight to the main points.
• Define secondary messages with interactivity.
• Establish a flow throughout the content.
• Measure the results.

A jellyfish's iconic bell shape is formed by its thick, gelatinous mesoglea, which gives the animal its structure. To move, a ring of muscles lining the bottom of the bell contracts, squeezing out a jet of water that propels the jellyfish forward. Once the muscles relax, the natural springiness of the mesoglea causes the bell to pop back open, ready for the next pulse. This simple push-and-refill cycle creates their characteristic pulsing motion.

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References

Zheng, S., Wang, X., Zhang, Y., & Li, Y. (2022). The developmental process in the siphonophore Nanomia bijuga reveals the evolutionary origin of the cnidarian medusa stage. Nature Communications, *13*(1), 7884. https://doi.org/10.1038/s41467-022-35570-1

The Editors of Encyclopaedia Britannica. (n.d.). Cnidarian - Importance. Encyclopedia Britannica. Retrieved October 26, 2023, from https://www.britannica.com/animal/cnidarian/Importance

University of Hawai‘i at Mānoa. (n.d.). Phylum Cnidaria. Exploring Our Fluid Earth. Retrieved October 26, 2023, from https://manoa.hawaii.edu/exploringourfluidearth/biological/invertebrates/phylum-cnidaria