This is the picture of a protist that was taken in my Biology lab under a microscope. This
image has been cropped from a video. In the video, Euglena sp. changes shape due to the flexibility it receives from its pellicle. This single-called eukaryote can be either heterotrophic or autotrophic. They live in both salt and fresh water- aquatic environments. It is small in size, green colored, and has a stigma near the flagellum. It is involved in performing phagocytosis as well. (https://www.thoughtco.com/about-euglena-cells-4099133)

Supplementary Videos
1) https://drive.google.com/open?id=1E5Blc4MXtIwSXocR8OHIx2jH3bcsQRno
2) https://drive.google.com/open?id=1kAv-EzqmJflQaDaUzkp_pRyRwcCPQEwI

Pictures were either 400x or 1000x magnification under a light microscope and from a pond sample from a light-exposed area on the University of South Florida campus. The following species is in the genus of Ceratium with its common characteristics of hollow horns and depressed ventral area.
This species of Ceratium (see videos) include a long apical horn and unequal antapical horns.

Likely might it be specifically C. hirundinella, a freshwater species, according to the second link provided and due to it being obtained from freshwater sources and also pale yellow. The fourth link suggests that the species might be either C. lineatum or C. kofoidii.

http://oceandatacenter.ucsc.edu/PhytoGallery/Dinoflagellates/ceratium.html
http://oceandatacenter.ucsc.edu/PhytoGallery/Freshwater/Ceratium.html
https://phytoplanktonguide.lumcon.edu/display/
https://www.researchgate.net/file.PostFileLoader.html?id=5543575cf079ed77408b4582&assetKey=AS%3A273768600014849%401442282928872

This dinoflagellate was observed from a water sample from Castor Beach in USF. They were analyzed under a microscope. The defining characteristic of this protist being a dinoflagellate is the shape of the organism as they have two perpendicular flagella and are marine protists. They are golden brown in color as seen through the photos and are found in almost all aquatic environments across the globe. According to https://scripps.ucsd.edu/labs/mlatz/bioluminescence/dinoflagellates-and-red-tides/, they are 15-40 microns in size and can be as large as 2 millimeters in diameter.

This is a water sample taken from the shaded area of Castor Beach. The species had the two cellulose plates and long three sharp flagellates. This species lives in aquatic environments near zooplankton of marine and freshwater ecosystems (http://tolweb.org/Dinoflagellates/2445). Most Dinoflagellates can be found on the coasts around the United States, from the east to the west. Not many Dinoflagellates are found on the inlands of continents.

This is the picture of a protist that was taken in my Biology lab under a microscope. This
image has been cropped from a video. In the video, Euglena sp. changes shape due to the flexibility it receives from its pellicle. This single-called eukaryote can be either heterotrophic or autotrophic. They live in both salt and fresh water- aquatic environments. It is small in size, green colored, and has a stigma near the flagellum. It is involved in performing phagocytosis as well. (https://www.thoughtco.com/about-euglena-cells-4099133)

Organism observed in lab from a water sample originating from Castor pond in a sunlight location. This protist's armored plate and flagella are characteristics of dinoflagellates. This organism is observed to have two flagella and one horn which led to its identification within the genus of ceratium. Distribution of this type of organism can be found around the world in freshwater and marine habitats.

More information on this organism's identification can be found here: https://www.vattenkikaren.gu.se/fakta/arter/algae/mikroalg/ceraspp/ceraspe.html

This Dinoflagellate was observed in the lab. This dinoflagellate was found in the pond water by Castor Beach. This dinoflagellate is identified by its unique “double pseudopodia” it uses to propel itself through the water.

Kingdom: Protista
Supergroup: SAR Clade
Alveolata-Dinoflagellate
Genus: Ceratium

This protist can be observed by it's perpendicular flagella. Looking closely you can see a groove going transverse around the body of the organism. They are made up if cellulose plates that serve as protection. This protist is EXTREMELY small, this observation was done under a microscope to see these little dinoflagellate. They were living in pond water found at USF. They were observed in water that is subjected to sunlight, which helps further identify this as a dinoflagellate because they tend to have photosynthetic capabilities. They appeared to be a light brown/yellow color.
"Dinoflagellates possess two flagella, one (the transverse flagellum) may be contained in a groove-like structure around the equator of the organism (the cingulum), providing forward motion and spin to the dinoflagellate, the other (the longitudinal flagellum) trailing behind providing little propulsive force, mainly acting as a rudder. Another characteristic of the dinoflagellates is the wall composition and structure; early classification of the dinoflagellates was based on the presence (termed armoured) or absence (termed unarmoured) of a rigid outer cell covering (or theca)"(UCL).

Dinoflagellate are typically found in bodies of water that are subjected to sunlight. they are very common in freshwater habitats found throughout the state of Florida. They can also be found in bodies of salt water, they are the causes of redtide.

Website for known description:https://www.ucl.ac.uk/GeolSci/micropal/dinoflagellate.html

The water was collected in the morning of February 4th 2019, they were observed at 4:14PM on that day.

These photosynthetic dinoflagellates were found in a pond water sample from Castor Beach on USF campus. Specifically on the side of the pond that receives the most light. Their flagellum help them navigate and move from stimuli in their environment.

Dinoflagellates are a subgroup of algae, and are a multicellular eukaryote that can inhabit both freshwater and saltwater aquatic environments. They are able to live in polar and tropical regions, and are found in every continent. The defining characteristic of dinoflagellates is their perpendicularly oriented flagella that can be seen in the picture above. This dinoflagellate was obtained from a freshwater pond and was observed under a microscope. A range for the size is 15-40 microns. The color of the dinoflagellate observed was green. More information, including the information present can be found here: http://www.deepseanews.com/2015/12/go-home-dinoflagellate-youre-drunk/

These dinoflagellates were observed under a microscope at 40X. This sample was taken from the shady pond areas of Caster Beach on USF campus. They are apart of the Kingdom Protista (Chromista), Phylum Miozoa, Class Dinophyceae, Order, Gonyaulacales, Family Certatiaceae, and Genus Ceratium. They are asymmetrical in shape, yellow/greenish in color, and are between 10-100 micrometers in length. Some do sexually reproduce (most are asexual) by anisogamous or isogamous reproduction. These organisms can be found in any body of fresh (occasionally) or saltwater. One characteristic they have is a flagella that allow them to swim through the water they live in.

http://tolweb.org/Dinoflagellates/2445

http://www.biologydiscussion.com/protists/dinoflagellates-structure-and-reproduction-protists/52103