📸 PhotoPhoto: Corvana · CC BY-SA 3.0 · Wikimedia Commons Source
Common hydra
Hydra vulgaris (Common hydra · Common hydra)
Not Evaluated (NE) on the IUCN Red List yet.
💡 Everyday Comparisons for Size, Mass & Speed
- 💡 Because of its regenerative ability to restore parts cut either crosswise or lengthwise, it is widely used as a laboratory animal in cell and regeneration research (Reddy et al. 2019).
- 💡 It is a freshwater organism also recorded in Korea, listed as Yudu-hideura (Korean name) on the National List of Species of Korea.
Reference standards: coach bus ~12 m, mid-size car ~4.9 m, compact car ~1 t, basketball hoop 3.05 m, credit card 8.56 cm.
📖 1. Overview
The common hydra is a tiny freshwater polyp famous for its ability to regenerate from cut body fragments.
🦴 2. Anatomy & Morphology
Its cylindrical body, made of two cell layers, encloses a digestive cavity and has a ring of 5–6 tentacles around the mouth.
🔍 3. Ecology & Behavior
It catches prey with its tentacles. It has a strong regenerative ability to regrow when part of its body is cut off, and it reproduces by budding.
🇰🇷 4. Connection to Korea
It is listed on the National List of Species of Korea under the name Yudu-hideura (Korean name).
📚 Sources & References
- • IUCN Red List: not evaluated (NE) — cross-checked with the Wikidata conservation-status entry
- • catalogueoflife.org — 3N2DP
- • 국가생물종목록(국립생물자원관) ktsn 120000227019 — https://species.nibr.go.kr/home/mainHome.do?cont_link=009&subMenu=009002&contCd=009002&ktsn=120000227019
- • wikidata.org — Q2720227
- • commons.wikimedia.org — File:Hydravulgaris.jpg
- • pmc.ncbi.nlm.nih.gov — PMC7116057
- • Silhouette: PhyloPic — Darrin Schultz · CC0 1.0
Recorded dimensions are widely cited representative estimates from public literature and may vary by study or specimen.