''Lepidophthalmus turneranus'' (formerly ''Callianassa turnerana''), the Cameroon ghost shrimp, is a species of "ghost shrimp" or "mud lobster" that lives off the coast of

West Africa West Africa, also known as Western Africa, is the westernmost region of Africa. The United Nations geoscheme for Africa#Western Africa, United Nations defines Western Africa as the 16 countries of Benin, Burkina Faso, Cape Verde, The Gambia, Gha ...

. It occasionally erupts into dense swarms, one of which resulted in the naming of the country

Cameroon Cameroon, officially the Republic of Cameroon, is a country in Central Africa. It shares boundaries with Nigeria to the west and north, Chad to the northeast, the Central African Republic to the east, and Equatorial Guinea, Gabon, and the R ...

Distribution

''Lepidophthalmus turneranus'' is found in

lagoon A lagoon is a shallow body of water separated from a larger body of water by a narrow landform, such as reefs, barrier islands, barrier peninsulas, or isthmuses. Lagoons are commonly divided into ''coastal lagoons'' (or ''barrier lagoons'') an ...

s and

estuaries An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries form a transition zone between river environments and maritime environm ...

, including almost

fresh water Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salt (chemistry), salts and other total dissolved solids. The term excludes seawater and brackish water, but it does include ...

, around the

Gulf of Guinea The Gulf of Guinea (French language, French: ''Golfe de Guinée''; Spanish language, Spanish: ''Golfo de Guinea''; Portuguese language, Portuguese: ''Golfo da Guiné'') is the northeasternmost part of the tropical Atlantic Ocean from Cape Lopez i ...

from

Togo Togo, officially the Togolese Republic, is a country in West Africa. It is bordered by Ghana to Ghana–Togo border, the west, Benin to Benin–Togo border, the east and Burkina Faso to Burkina Faso–Togo border, the north. It is one of the le ...

to Congo.

Description

Adults reach a total length of . The

rostrum Rostrum may refer to: * Any kind of a platform for a speaker: **dais **pulpit ** podium * Rostrum (anatomy), a beak, or anatomical structure resembling a beak, as in the mouthparts of many sucking insects * Rostrum (ship), a form of bow on naval ...

ends in three or five teeth, a feature shared with the Madagascan species '' L. grandidieri''. In juveniles, the teeth may be missing. There is a

sexual dimorphism Sexual dimorphism is the condition where sexes of the same species exhibit different Morphology (biology), morphological characteristics, including characteristics not directly involved in reproduction. The condition occurs in most dioecy, di ...

in the form of the

cheliped A chela ()also called a claw, nipper, or pinceris a pincer-shaped organ at the end of certain limbs of some arthropods. The name comes from Ancient Greek , through Neo-Latin '. The plural form is chelae. Legs bearing a chela are called chelipeds ...

(claw-bearing

appendage An appendage (or outgrowth) is an external body part or natural prolongation that protrudes from an organism's body such as an arm or a leg. Protrusions from single-celled bacteria and archaea are known as cell-surface appendages or surface app ...

): females have a "deep crescent-shaped depression" near the base of the inside of the claw's fixed finger, while males lack this depression.

Ecology and behaviour

''Lepidophthalmus turneranus'' lives in

burrow file:Chipmunk-burrow (exits).jpg, An eastern chipmunk at the entrance of its burrow A burrow is a hole or tunnel excavated into the ground by an animal to construct a space suitable for habitation or temporary refuge, or as a byproduct of Animal lo ...

s in mud. Every three to five years, vast swarms form in

, and

copulation Sexual intercourse (also coitus or copulation) is a sexual activity typically involving the insertion of the erect male penis inside the female vagina and followed by thrusting motions for sexual pleasure, reproduction, or both.Sexual inte ...

occurs outside the burrow. When James Aspinall Turner presented the first specimens to the

British Museum The British Museum is a Museum, public museum dedicated to human history, art and culture located in the Bloomsbury area of London. Its permanent collection of eight million works is the largest in the world. It documents the story of human cu ...

, he noted that:

... this long-bodied Crustacean appears periodically in the river in prodigious numbers, which disappear in the course of ten days or a fortnight. The natives are very fond of them, as they are delicious eating; and as soon as they make their appearance in the river, the men here leave their usual pursuits to catch them.

Taxonomic history

The Cameroon ghost shrimp was first described by Adam White in 1861, under the name ''Callianassa turnerana''. That description was based on a specimen given by "the captain of an African trader" to James Aspinall Turner, who in turn presented it to the Zoology Department of the British Museum (now part of the

Natural History Museum A natural history museum or museum of natural history is a scientific institution with natural history scientific collection, collections that include current and historical records of animals, plants, Fungus, fungi, ecosystems, geology, paleo ...

). The species was transferred to the genus '' Lepidophthalmus'' by K. Sakai in 1999.

Cameroon

''Lepidophthalmus turneranus'' is "probably the only crustacean ... for which a country is named". When the

Portuguese explorers Portuguese maritime explorations resulted in numerous territories and maritime routes recorded by the Portuguese on journeys during the 15th and 16th centuries. Portuguese sailors were at the vanguard of European exploration, chronicling and mapp ...

discovered the

Wouri River The Wouri (also Vouri or Vuri) is a river in Cameroon. The Wouri forms at the confluence of the rivers Nkam River, Nkam and Makombé River, Makombé, northeast of the city of Yabassi. It then flows about southeast to the Wouri estuary at Douala ...

in the 15th century, they witnessed a swarm of ''L. turneranus'', and therefore named the river ' ("river of the shrimp"). That name was

anglicised Anglicisation or anglicization is a form of cultural assimilation whereby something non-English becomes assimilated into or influenced by the culture of England. It can be sociocultural, in which a non-English place adopts the English language ...

to "

s River", which came to be used for the whole country, and borrowed into other languages (including the French ', the

German German(s) may refer to: * Germany, the country of the Germans and German things **Germania (Roman era) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizenship in Germany, see also Ge ...

' and the Dutch ').

References

{{Taxonbar, from=Q291599 Axiidea Crustaceans of the Atlantic Ocean Crustaceans described in 1861 Taxa named by Adam White (zoologist)