''Orithyia sinica'', sometimes called tiger crab or the tiger face crab, is a "singularly unusual"

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

of crab, whose characteristics warrant its separation into a separate

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...

family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...

and even superfamily, having previously been included in the Dorippoidea or Leucosioidea. Its larvae, for instance, are unlike those of any other crab.

Description

''O. sinica'' is a distinctive species, with stripes on the legs, and prominent eyespots on the carapace; the females'

abdomen The abdomen (colloquially called the belly, tummy, midriff, tucky or stomach) is the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. The abdomen is the front part of the abdominal segment of the to ...

is unusually narrow, leaving the vulvae exposed. The legs are flattened at the end, and this is an adaptation to digging, not

swimming Swimming is the self-propulsion of a person through water, or other liquid, usually for recreation, sport, exercise, or survival. Locomotion is achieved through coordinated movement of the limbs and the body to achieve hydrodynamic thrust that r ...

Distribution and fishery

''O. sinica'' is found along the coast of mainland

Asia Asia (, ) is one of the world's most notable geographical regions, which is either considered a continent in its own right or a subcontinent of Eurasia, which shares the continental landmass of Afro-Eurasia with Africa. Asia covers an are ...

from

South Korea South Korea, officially the Republic of Korea (ROK), is a country in East Asia, constituting the southern part of the Korean Peninsula and sharing a land border with North Korea. Its western border is formed by the Yellow Sea, while its eas ...

Hong Kong Hong Kong ( (US) or (UK); , ), officially the Hong Kong Special Administrative Region of the People's Republic of China (abbr. Hong Kong SAR or HKSAR), is a city and special administrative region of China on the eastern Pearl River Delta i ...

, but is missing from the nearby

island An island (or isle) is an isolated piece of habitat that is surrounded by a dramatically different habitat, such as water. Very small islands such as emergent land features on atolls can be called islets, skerries, cays or keys. An island ...

s, such as

Taiwan Taiwan, officially the Republic of China (ROC), is a country in East Asia, at the junction of the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the nort ...

, the

Ryukyu Islands The , also known as the or the , are a chain of Japanese islands that stretch southwest from Kyushu to Taiwan: the Ōsumi, Tokara, Amami, Okinawa, and Sakishima Islands (further divided into the Miyako and Yaeyama Islands), with Yona ...

and Japan, even though the intervening waters are shallow and the crab's larvae are

plankton Plankton are the diverse collection of organisms found in water (or air) that are unable to propel themselves against a current (or wind). The individual organisms constituting plankton are called plankters. In the ocean, they provide a crucia ...

ic. Throughout its range, ''O. sinica'' is fished on a small scale and commands high prices.

Etymology

The name ''Orithyia'' (also spelt ''Orithuja'') commemorates

Orithyia In Greek mythology, Orithyia or Oreithyia (; el, Ὠρείθυια ''Ōreithuia''; la, Ōrīthyia) was the name of the following women: *Orithyia or Orythya, the Nereid of raging seas and one of the 50 marine-nymph daughters of the 'Old Man of th ...

, daughter of

Erechtheus Erechtheus (; grc, Ἐρεχθεύς) in Greek mythology was the name of an archaic king of Athens, the founder of the ''polis'' and, in his role as god, attached to Poseidon, as "Poseidon Erechtheus". The mythic Erechtheus and the historical Ere ...

King of Athens Before the Athenian democracy, the tyrants, and the Archons, the city-state of Athens was ruled by kings. Most of these are probably mythical or only semi-historical. The following lists contain the chronological order of the title King of Athens ( ...

References

External links

* {{Taxonbar, from=Q1060688 Crabs Edible crustaceans Commercial crustaceans Crustaceans described in 1771 Crustaceans of the Pacific Ocean Arthropods of Korea Arthropods of China Marine fauna of East Asia Invertebrates of Hong Kong Taxa named by Carl Linnaeus