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Exploring Crabs and the Crab Nebula

This quiz tests your knowledge on crabs and the Crab Nebula, covering topics from biological classification to marine consumption.

#Marine Biology #Astrophysics #Crustaceans #Quiz

1 The ________ lies at the centre of the nebula.

2 Crabs are omnivores, feeding primarily on ________ [17], and taking any other food, including molluscs, worms, other crustaceans, fungi, bacteria and detritus, depending on their availability and the crab species.

3 What kind of animal is a Crab?

4 What classis does Crab belong to?

5 Crabs make up 20% of all marine ________ caught, farmed, and consumed worldwide, amounting to 1½ million tonnes annually.

6 What is the subphylum of Crab?

7 John Bevis first observed the ________ and its resemblance to the animal in 1731.

8 Crabs are generally covered with a thick ________, and armed with a single pair of chelae (claws).

9 They were previously thought to be a ________, but are now believed to represent at least two distinct lineages, one in the Old World and one in the New World [4].

10 Other animals, such as ________, king crabs, porcelain crabs, horseshoe crabs and crab lice, are not true crabs.

💡 Interesting Facts

  • the animals described in Carl Linnaeus' Centuria Insectorum include the crab Hepatus epheliticus, the rhinoceros beetle Dynastes tityus (pictured), the scale insect Conchaspis capensis and the butterfly Catopsilia scylla.
  • the edible mushroom Russula xerampelina (pictured) has a taste and smell reminiscent of shellfish or crab.
  • the genus Platythelphusa represents the only evolutionary radiation of crabs to have occurred in a freshwater lake.
  • the recently discovered deep-sea decapod Kiwa hirsuta was dubbed the yeti crab by its discoverers on account of its hairy appearance.
  • the semaphore crab is the most abundant crab species in mangroves on Australia's east coast.
  • the zoea larvae of crabs have long rostral and dorsal spines.
  • Edward J. Miers was paid 60 guineas for his monograph on the crabs of the Challenger expedition.
  • gejang (pictured) is a variety of jeotgal, fermented seafood in Korean cuisine, which is made by marinating fresh raw crabs in soy sauce.
  • a colony of the crab species Potamon fluviatile (pictured) may have lived in Rome since before the Romans.
  • symbiotic moss animals live on the bristles of the crab known as the Mud-Runner (pictured).
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