Washboard
Washboard
megalonaias nervosa
The Washboard (Megalonaias nervosa) is a remarkable and robust freshwater mussel native to the river systems of central North America, particularly the Mississippi River basin. Taking its common name from the distinct, heavy ridges on its shell that resemble an old-fashioned laundry washboard, this species is among the largest and longest-lived freshwater bivalves in North America. By quietly anchoring themselves in the riverbed, Washboards act as natural biological filters, drawing in water to feed on microscopic particles and significantly improving the water quality around them. Historically, their exceptionally thick shells made them a primary target during the pearl button industry boom of the late 19th century. Today, they remain a fascinating study in river ecology, notable for their complex lifecycle which involves a temporary parasitic stage where their microscopic larvae hitch a ride on the gills of specific host fish to disperse across the river system.
生息地: Found partially buried in mud, sand, or gravel substrates at the bottom of medium to large rivers with moderate currents.
外見
The Washboard mussel is easily identified by its exceptionally large, thick, and heavy shell, which can grow up to 12 inches across. The most distinguishing feature is the heavy, V-shaped corrugations or folds on the posterior half of the shell, giving it the appearance of a rugged washing board. The outer periostracum (skin of the shell) is typically dark brown or entirely black in older individuals, while younger mussels may have greenish-brown hues. Inside, the shell's nacre (mother-of-pearl) is predominantly white, though it can occasionally exhibit pinkish or iridescent purple patches.
界Animalia門Mollusca綱Bivalvia目Unionida科Unionidae属Megalonaias
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
Because they are exceptionally efficient filter feeders, a healthy bed of Washboard mussels can actively clean and clarify millions of gallons of river water each day.
During the late 19th and early 20th centuries, the immensely thick shells of the Washboard were harvested by the millions and punched out to make pearl clothing buttons before the invention of plastic.
It gets its name from its deeply grooved shell, which looks remarkably like an antique laundry washboard.
Washboard mussels can live for over 60 years, spending nearly their entire adult lives anchored to a single spot on the riverbed.
特殊能力
能力
Biological Water Filtration
Filters large volumes of river water to extract microscopic food, naturally purifying and clarifying the surrounding aquatic ecosystem in the process.
能力
Parasitic Larval Dispersal
Releases microscopic larvae called glochidia that temporarily attach to the gills of specific host fish, allowing the immobile adult mussels to colonize new river areas.
能力
Muscular Burrowing Anchor
Utilizes a strong, hatchet-shaped muscular foot to dig deep into gravel or mud, anchoring firmly against strong and unpredictable river currents.
サイズと詳細
- 長さ
- 15-30 cm
- 体重
- 0.5-2.5 kg
- 寿命
- 30-70 年
- 一度の産卵数
- 10000-99000
- 抱卵期間
- 30-90 日
食性と食事
Washboard mussels are filter feeders that continuously pump water through their bodies to extract microscopic plant and animal matter.
年齢による違い: Larval glochidia absorb nutrients from the blood and tissues of a host fish before dropping off to become filter-feeding adults.
主な食物
- Phytoplankton
- Zooplankton
- Organic detritus
- Bacteria
採餌方法
- Filtering
生態系とのつながり
host
Channel Catfish
Ictalurus punctatus
Microscopic larvae attach to the gills of the Channel Catfish to complete their development and travel safely across the river system.
host
White Crappie
Pomoxis annularis
White Crappie serves as another common fish host for Washboard glochidia.
eaten by
Muskrat
Ondatra zibethicus
Muskrats are notable predators of adult mussels, often leaving piles of empty shells known as middens on riverbanks.
特徴
このオブジェクトにはまだ特徴バッジが割り当てられていません。
別名
まだ別名はありません。
コレクション
テーマが追加されると、このオブジェクトのコレクションがここに表示されます。
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
Washboardを見分けるには？
Washboard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。
Washboardの長さは何ですか？
15-30 cm
Washboardの体重は何ですか？
0.5-2.5 kg
Washboardの寿命は何ですか？
30-70 年
Washboardは何を食べますか？
Washboard mussels are filter feeders that continuously pump water through their bodies to extract microscopic plant and animal matter.
Washboardは通常どこに生息していますか？
Found partially buried in mud, sand, or gravel substrates at the bottom of medium to large rivers with moderate currents.
Washboardはどのように狩りをしますか？
Filtering
Washboardの一度の産卵数は何ですか？
10000-99000
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