Pacific Sand Crab
探検Animal
Pacific Sand Crab
emerita analoga
The Pacific Sand Crab (Emerita analoga), also known as the mole crab, is a small, fascinating crustacean that thrives in the high-energy, turbulent swash zone of sandy beaches along the Pacific coast. Spending its entire life buried just beneath the surface of the sand, this remarkable creature moves up and down the shoreline with the shifting tides, staying in the wet, soft sand where waves continuously crash. It is highly valued as an ecological indicator of beach health and serves as a vital link in the marine food web, feeding countless coastal birds, surf fish, and sea otters. Watching a group of sand crabs rapidly disappear backward into the wet sand as a wave recedes is one of the most delightful and iconic experiences for beachgoers of all ages.
生息地: Found in the intertidal swash zone of sandy ocean beaches, constantly migrating with the shifting tides.
外見
The Pacific Sand Crab features a smooth, egg-shaped, barrel-like carapace that lacks a tail or claws, making it perfectly adapted for burrowing. Its coloration is a cryptic, sandy gray-brown to off-white, allowing it to blend seamlessly into its sandy environment. Females are significantly larger than males, reaching lengths of up to 3.5 centimeters, while males remain around 2 centimeters. They possess highly specialized, feathery antennae used for filter feeding, and flat, paddle-like legs designed for backward burrowing rather than walking.
界Animalia門Arthropoda綱Malacostraca目Decapoda科Hippidae属Emerita
カテゴリ
Animal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
Female sand crabs carry bright, neon-orange egg masses under their abdomens, which can contain up to 45,000 eggs at a time.
Sand crabs are highly sensitive to toxins and are widely used by scientists as an indicator species to monitor the health and pollution levels of sandy beaches.
They can only crawl and burrow backward; they are completely incapable of walking forward.
特殊能力
能力
Backward Burrowing
Using specialized paddle-like legs, the sand crab can bury itself backward into wet sand in under two seconds to escape predators and wave action.
能力
Feathery Filter Feeding
Unfurls long, plume-like antennae into the retreating wave wash to trap microscopic plankton and detritus.
能力
Tidal Migration
Rides waves up and down the beach slope to remain in the moist swash zone as tides change throughout the day.
サイズと詳細
- 長さ
- 1-4 cm
- 体重
- 0.001-0.02 kg
- 寿命
- 2-3 年
- 一度の産卵数
- 1000-45000
- 抱卵期間
- 20-30 日
食性と食事
Feeds primarily by filtering microscopic food particles, such as phytoplankton and detritus, from retreating waves using feathery antennae.
年齢による違い: Larvae feed on smaller planktonic organisms in the open ocean, while adults filter-feed on benthic and pelagic microflora in the sandy surf.
主な食物
- Phytoplankton
- Dinoflagellates
- Organic detritus
- Diatoms
採餌方法
- Filtering
生態系とのつながり
eaten by
Sanderling
Calidris alba
Flocks of sanderlings forage along the wet sand, using their beaks to probe and consume sand crabs.
eaten by
Barred Surfperch
Amphistichus argenteus
This surf-dwelling fish patrols the shallow breaking waves to feed heavily on sand crabs.
eaten by
Southern Sea Otter
Enhydra lutris nereis
Sea otters occasionally forage close to the sandy shoreline to feed on larger female sand crabs.
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
Pacific Sand Crabを見分けるには？
Pacific Sand Crab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。
Pacific Sand Crabの長さは何ですか？
1-4 cm
Pacific Sand Crabの体重は何ですか？
0.001-0.02 kg
Pacific Sand Crabの寿命は何ですか？
2-3 年
Pacific Sand Crabは何を食べますか？
Feeds primarily by filtering microscopic food particles, such as phytoplankton and detritus, from retreating waves using feathery antennae.
Pacific Sand Crabは通常どこに生息していますか？
Found in the intertidal swash zone of sandy ocean beaches, constantly migrating with the shifting tides.
Pacific Sand Crabはどのように狩りをしますか？
Filtering
Pacific Sand Crabの一度の産卵数は何ですか？
1000-45000
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