Spotted Rocksnail
Spotted Rocksnail
leptoxis picta
The Spotted Rocksnail (Leptoxis picta) is a tragic symbol of the fragile biodiversity native to the freshwater river systems of the American Southeast. Once thriving in the swift, oxygen-rich currents of the Coosa River basin in Alabama, this small gastropod played a vital role in its ecosystem by grazing on algae and biofilms coating river rocks. Its presence was a key indicator of clean, fast-flowing water and healthy aquatic habitats. Unfortunately, extensive damming and siltation in the 20th century radically altered its riverine home, leading to its extinction. Today, the Spotted Rocksnail serves as an important historical case study for malacologists and conservationists, highlighting the devastating impact of river impoundment on endemic freshwater mollusks.
生息地: Typically inhabited shallow, fast-flowing shoals and rapids of large rivers, adhering tightly to clean gravel, cobble, and bedrock substrates.
外見
The Spotted Rocksnail possessed a robust, subglobose shell measuring roughly 1.2 to 1.9 centimeters in length. The shell's coloration was typically a warm yellowish or olive-brown, beautifully adorned with several rows of distinct, dark reddish-brown spots or dashed bands that wrapped around the whorls. It featured a large, wide aperture and a relatively low spire, adaptations suited for clinging tightly to rocks in strong river currents. The operculum was corneous and dark, sealing the snail securely inside its thick shell when threatened.
界Animalia門Mollusca綱Gastropoda科Pleuroceridae属Leptoxis
カテゴリ
Invertebrateレア度
Common
危険度
1/5 · 非常に低い
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おもしろい事実
Its extinction coincided with the construction of several hydroelectric dams on the Coosa River, which permanently flooded their shallow, rocky rapids under deep, stagnant reservoir waters.
Spotted Rocksnails were highly sensitive to oxygen levels; they could only survive in highly oxygenated, fast-moving river shoals.
The species name 'picta' translates to 'painted' in Latin, referring to the beautiful dark spots and bands decorating its shell.
特殊能力
能力
Torrential Grip
Equipped with a broad, muscular foot and a hydrodynamic shell shape that allowed it to withstand extremely strong river currents without being swept downstream.
能力
Radular Scraping
Possessed a specialized, ribbon-like radula embedded with microscopic teeth, allowing it to scrape tough microalgae and biofilms off submerged stones.
能力
Opercular Protection
Utilized a tough, horn-like operculum to securely seal its shell opening, protecting it from predators and temporary dry conditions.
サイズと詳細
- 長さ
- 1+ cm
- 体重
- 0.002+ kg
- 寿命
- 2+ 年
- 一度の産卵数
- 20+
- 抱卵期間
- 14+ 日
食性と食事
Primarily grazed on periphyton, microscopic algae, and organic biofilms growing on the surfaces of rocks in swift river currents.
年齢による違い: Juveniles and adults fed on similar biofilms, though juveniles may have targeted thinner, more delicate algal layers.
主な食物
- Periphyton
- Diatoms
- Green algae
- Organic detritus
採餌方法
- Grazing
生態系とのつながり
eaten by
Freshwater Drum
Aplodinotus grunniens
The freshwater drum was a major predator of benthic river snails, using its specialized pharyngeal teeth to crush their thick shells.
competitor
Clear Elimia
Elimia clara
Shared similar riverine habitats and competed directly for periphyton resources on the same rocky substrates.
mutualism
Green Algae
Cladophora glomerata
Filamentous green algae hosted micro-algae that the snail grazed upon, while the snail's grazing kept the algal mats clean of excessive silt.
特徴
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別名
まだ別名はありません。
コレクション
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安全性
危険度
1/5 · 非常に低い
まだ特別な安全上の注意はありません。
よくある質問
Spotted Rocksnailを見分けるには？
Spotted Rocksnailを識別する最も簡単な方法は、Snappit自然識別アプリを使用することです。
Spotted Rocksnailの長さは何ですか？
1+ cm
Spotted Rocksnailの体重は何ですか？
0.002+ kg
Spotted Rocksnailの寿命は何ですか？
2+ 年
Spotted Rocksnailは何を食べますか？
Primarily grazed on periphyton, microscopic algae, and organic biofilms growing on the surfaces of rocks in swift river currents.
Spotted Rocksnailは通常どこに生息していますか？
Typically inhabited shallow, fast-flowing shoals and rapids of large rivers, adhering tightly to clean gravel, cobble, and bedrock substrates.
Spotted Rocksnailはどのように狩りをしますか？
Grazing
Spotted Rocksnailの一度の産卵数は何ですか？
20+
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