- · Grid units represent actual meters (m); human and animals are drawn to the exact same scale with original silhouette aspect ratios preserved.
- · When a size range is recorded (e.g. 1–1.6m), the lower bound is used for scale comparison.
- · Adams land snail: Drawn using our own body-shape diagram where an open-licensed silhouette was unavailable.
- · Human silhouette: PhyloPic — NASA · Public Domain Mark 1.0
Adams land snail
Karaftohelix adamsi (Adams land snail · Adams land snail)
🇰🇷 Class II endangered wildlife (Korea)
💡 Everyday Comparisons for Size, Mass & Speed
- 💡 Because pesticides and weeding used in crop cultivation are threat factors (National Institute of Ecology), how fields and areas around houses on Ulleungdo are managed is tied to the fate of this snail.
- 💡 Its shell width of 11 mm is less than half the diameter of a Korean 100-won coin (about 24 mm) (Comparison).
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 Adams land snail is a species endemic to Korea, found throughout Ulleungdo and ranking among the larger terrestrial gastropods on the island.
🦴 2. Anatomy & Morphology
Its shell has a low conical shape with 4.5 whorls, distinct vertical growth lines, and sometimes dark reddish-brown bands. Its foot is broad and flat, and its head bears 2 pairs of tentacles with eyes at their tips.
🔍 3. Ecology & Behavior
It is herbivorous, feeding on mushrooms, moss, fruits, and wood. As a hermaphrodite, it lays eggs in shallow pits or under fallen leaves, and the young develop directly into snail form from the eggs (direct development).
🇰🇷 4. Connection to Korea
It is a Class II endangered wildlife (Korea) species endemic to Korea and is found across Ulleungdo. Limited habitat area, habitat development, pesticide use, and weeding are threat factors.
📚 Sources & References
- • IUCN Red List NT (2023) — https://www.iucnredlist.org/species/197373965/197528978
- • 멸종위기 야생생물 Ⅱ급 — 국가생물종목록(국립생물자원관) ktsn 120000042587 — https://species.nibr.go.kr/home/mainHome.do?cont_link=009&subMenu=009002&contCd=009002&ktsn=120000042587
- • IUCN Red List category NT — latest assessment at iucnredlist.org
- • Korean protection status: Class II endangered wildlife (Korea)
- • catalogueoflife.org — 9WV8Z
- • iucnredlist.org — 197528978
- • 국가생물종목록(국립생물자원관) ktsn 120000042587 — https://species.nibr.go.kr/home/mainHome.do?cont_link=009&subMenu=009002&contCd=009002&ktsn=120000042587
- • wikidata.org — Q133822512
- • nie.re.kr — view.do
Recorded dimensions are widely cited representative estimates from public literature and may vary by study or specimen.