Calappa japonica, also known as the Japanese shame-faced crab,[1] is a marine species of box crab in the family Calappidae.[2] Originally found in the waters around Japan, more recently it has been found in Africa, the Red Sea and Western Australia.
Calappa japonica is a large crab, and has a yellow and red colouration.[1] The length of carapace is approximately .65 times the width, with a tuberculated surface. Seven sharp teeth are located around the margins of each clypeiform expansion.[3]
This species was first discovered in Tokyo Bay, Japan. It is now known to occur in regions as far away as Africa and Western Australia,[1] and lives in waters up to 250 m (820 ft) deep.[1] as well as being found in the Red Sea.[4]
This crab is a predator, and feeds on invertebrates such as other crabs, as well as oysters and snails. It has a specially adapted right pincer which it uses to break open snail's shells. There is a large accessory tooth located at the base of the hinged part of the claw located opposite a flat plate on the fixed part, and it uses these as a vice. After breaking open the shell, it uses its left pincer, which is sharper and longer than the right one, and better at picking out the soft tissues. When it is disturbed, it folds its chelae (pincers) in front of its face and retracts its walking legs, forming a compact, well-armoured box-like structure; this defensive stance makes it appear to be embarrassed, and has led to its receiving the name, "shame-faced crab".[1]
Calappa japonica, also known as the Japanese shame-faced crab, is a marine species of box crab in the family Calappidae. Originally found in the waters around Japan, more recently it has been found in Africa, the Red Sea and Western Australia.
Calappa japonica is een krabbensoort uit de familie van de Calappidae.[1] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1892 door Ortmann.
Bronnen, noten en/of referenties日本饅頭蟹(學名:Calappa japonica)[1] 是饅頭蟹科下的一種海生蟹。[2]
日本饅頭蟹是一種大型蟹,通體呈黃或紅色。[1] 其背殼的長寬比大約是0.65,背殼上有小瘤狀突起。在唇基部有七顆鋒利的牙齒。[3]
日本饅頭蟹的正模標本捕獲於日本東京灣,其分佈遠及非洲及紅海等地。[1][4]
日本饅頭蟹一般生活在海面下250米(820英尺)以上的。[1] 是一種肉食動物,以一些包括牡蠣和其他蟹類在內的無脊椎動物為食。其左右鉗相互作用以打開並進食牡蠣。[1]
ヤマトカラッパ(Calappa japonica) は、エビ目(十脚目)・カニ下目・カラッパ科に分類されるカニの一種。日本では東京湾以南の近海に生息するほか、西太平洋、インド洋、南アフリカなどに広く分布する。浅海に生息するが、他のカラッパに比べると比較的深い場所にいる。
甲幅は12~15cmで日本に生息するカラッパの中では最大種。甲の中央部はこぶ状の隆起で覆われている。後側縁の張り出しは弱く、歯の切れ込みも浅い。
通常は砂にもぐってじっとしており、貝類が近づくと内側に湾曲して缶切り状になった鋏脚で殻を切り開けて捕食する。
ヤマトカラッパ(Calappa japonica) は、エビ目(十脚目)・カニ下目・カラッパ科に分類されるカニの一種。日本では東京湾以南の近海に生息するほか、西太平洋、インド洋、南アフリカなどに広く分布する。浅海に生息するが、他のカラッパに比べると比較的深い場所にいる。
甲幅は12~15cmで日本に生息するカラッパの中では最大種。甲の中央部はこぶ状の隆起で覆われている。後側縁の張り出しは弱く、歯の切れ込みも浅い。
通常は砂にもぐってじっとしており、貝類が近づくと内側に湾曲して缶切り状になった鋏脚で殻を切り開けて捕食する。