The below are articles considered based on images for comparison in Microscopy. Of my own live blood Microscopy picture for biotoxin illness aka toxic mold (illness).
Resources for comparison:
Search terms:
Plasma angiotensin-converting enzyme
Nematocysts
Polyps
Not peer reviewed:
Cellular multifunctionality in the muscle activity of Hydra vulgaris
Unknown if Peer Reviewed:
Hydra's Four nematocysts.
Best one for Hydra electron microscopy of cindarian:
Özbek, Suat. (2010). The cnidarian nematocyst: A miniature extracellular matrix within a secretory vesicle. Protoplasma. 248. 635-40. 10.1007/s00709-010-0219-4.
https://www.researchgate.net/publication/47460428_The_cnidarian_nematocyst_A_miniature_extracellular_matrix_within_a_secretory_vesicle
Tortiglione, Claudia. "An Ancient Model Organism to Test In Vivo Novel Functional Nanocrystals". Biomedical Engineering - From Theory to Applications, edited by Reza Fazel-Rezai, IntechOpen, 2011. 10.5772/21038. https://www.intechopen.com/chapters/18630
https://idp.springer.com/authorize?response_type=cookie&client_id=springerlink&redirect_uri=https%3A%2F%2Flink.springer.com%2Farticle%2F10.1007%2Fs00435-012-0182-z
Blackwell Publishing Ltd 36 ORIGINAL ARTICLE Determination of proliferation by flow cytometry Quantification of cell-cycle distribution and mitotic index in Hydra by flow cytometry - Scientific Figure on ResearchGate. Available from: https://www.researchgate.net/figure/Morphology-of-Hydra-Microscope-image-of-Hydra-vulgaris-1-tentacle-2-hypostome-3_fig1_265794757 [accessed 18 Apr, 2022]
Campbell, R. & Iñiguez, A. & Iñiguez, Alonso & Martínez, D.. (2013). Hydra of Hawaii: Phylogenetic relationships with continental species. Hydrobiologia. 713. 10.1007/s10750-013-1508-7.