''Akera'' is a
marine
Marine is an adjective meaning of or pertaining to the sea or ocean.
Marine or marines may refer to:
Ocean
* Maritime (disambiguation)
* Marine art
* Marine biology
* Marine debris
* Marine habitats
* Marine life
* Marine pollution
Military
* ...
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
of
sea hare
The clade Anaspidea, commonly known as sea hares ('' Aplysia'' species and related genera), are medium-sized to very large opisthobranch gastropod molluscs with a soft internal shell made of protein. These are marine gastropod molluscs in the ...
in the family
Akeridae, known from the late
Callovian
In the geologic timescale, the Callovian is an age and stage in the Middle Jurassic, lasting between 166.1 ± 4.0 Ma (million years ago) and 163.5 ± 4.0 Ma. It is the last stage of the Middle Jurassic, following the Bathonian and preceding the ...
(Jurassic) to the recent periods.
[Gofas, S. (2012). Akera O.F. Müller, 1776. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=137641 on 2012-03-31]Sepkoski's Online Genus Database
Downloaded 14 October 2008.
Description
''Akera'' is a primitive genus. These sea hares do not fit completely in their external shell
Shell may refer to:
Architecture and design
* Shell (structure), a thin structure
** Concrete shell, a thin shell of concrete, usually with no interior columns or exterior buttresses
** Thin-shell structure
Science Biology
* Seashell, a hard o ...
; it just covers their visceral hump which is positioned at the posterior end of their bodies. Their streamlined bodies are adapted for burrowing.
Species
* '' Akera bayeri'' (Marcus & Marcus, 1967) - It can be found along the coast of Colombia
Colombia (, ; ), officially the Republic of Colombia, is a country in South America with insular regions in North America—near Nicaragua's Caribbean coast—as well as in the Pacific Ocean. The Colombian mainland is bordered by the Car ...
and Brazil
Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...
.
* ''Akera bullata
''Akera bullata'' is a species of sea snail (or sea slug), a marine opisthobranch gastropod mollusk in the family Akeridae, a family that is related to the sea hares. This species is the only European representative of the genus ''Akera''.
Di ...
'' (O. F. Müller
O is the fifteenth letter of the modern Latin alphabet.
O may also refer to:
Letters
* Օ օ, (Unicode: U+0555, U+0585) a letter in the Armenian alphabet
* Ο ο, Omicron, (Greek), a letter in the Greek alphabet
* O (Cyrillic), a letter of the ...
, 1776) - type species
*'' Akera julieae
''Akera'' is a marine genus of sea hare in the family Akeridae, known from the late Callovian (Jurassic) to the recent periods.Gofas, S. (2012). Akera O.F. Müller, 1776. Accessed through: World Register of Marine Species at http://www.marinespe ...
'' Valdes & Barwick, 2005
* '' Akera silbo'' Ortea & Moro, 2009
* '' Akera soluta'' (Gmelin Gmelin may refer to:
* Gmelin's test, a chemical test
* Gmelin database, a German handbook/encyclopedia of inorganic compounds initiated by Leopold Gmelin
People
* Carl Christian Gmelin (1762–1837), German botanist, author of ''Flora Badensis ...
, 1791) - Also called the ''Solute akera'', this species can be found in the Indo-West Pacific
The Indo-Pacific is a vast biogeographic region of Earth.
In a narrow sense, sometimes known as the Indo-West Pacific or Indo-Pacific Asia, it comprises the tropical waters of the Indian Ocean, the western and central Pacific Ocean, and the ...
. Little is known about this species. Its shell can grow as large as 45 mm in length.
* † ''Akera striatella
''Akera'' is a marine genus of sea hare in the family Akeridae, known from the late Callovian (Jurassic) to the recent periods.Gofas, S. (2012). Akera O.F. Müller, 1776. Accessed through: World Register of Marine Species at http://www.marinespe ...
'' Lamarck, 1804 - fossil from the Eocene
The Eocene ( ) Epoch is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene' ...
and Oligocene
The Oligocene ( ) is a geologic epoch of the Paleogene Period and extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that define the epoch are well identified but the ...
.
*'' Akera tasmanica'' Beddome, 1883:
References
External links
Akeroidea at Sea Slug Forum showing ''Akera soluta''
''Akera soluta'' at Sea Slug Forum
{{Taxonbar, from=Q1791144
Akeridae
Callovian first appearances
Extant Middle Jurassic first appearances