''Abudefduf nigrimargo'', known as the black margined-scale sergeant, is a
species
A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...
of
damselfish
Damselfish are those fish within the subfamilies Abudefdufinae, Chrominae, Lepidozyginae, Pomacentrinae, and Stegastinae within the family Pomacentridae.
Most species within this group are relatively small, although the four largest speci ...
in the family
Pomacentridae
Pomacentridae is a family of ray-finned fish, comprising the damselfishes and clownfishes. This family were formerly placed in the order Perciformes or as indeterminate percomorphs, but are now considered basal blenniiforms.
They are primaril ...
. It is native to the northwestern
Pacific Ocean
The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...
, where it is known only from
Taiwan
Taiwan, officially the Republic of China (ROC), is a country in East Asia. The main geography of Taiwan, island of Taiwan, also known as ''Formosa'', lies between the East China Sea, East and South China Seas in the northwestern Pacific Ocea ...
. The species is known to occur above shallow rocky
reef
A reef is a ridge or shoal of rock, coral, or similar relatively stable material lying beneath the surface of a natural body of water. Many reefs result from natural, abiotic component, abiotic (non-living) processes such as deposition (geol ...
s, where it forms feeding aggregations. The habitat in which ''Abudefduf nigrimargo'' can be found is also known to be inhabited by the related species ''
Abudefduf vaigiensis'' and ''
Abudefduf caudobimaculatus
''Abudefduf caudobimaculatus'', commonly known as the Okinawa sergeant, is a species of damselfish in the family Pomacentridae. It is native to the Indo-Pacific, where it is believed to range from East Africa to Yakushima and Lord Howe Island, inc ...
'' (previously recognized as synonymous with ''A. vaigiensis''). The species reaches 12 cm (4.7 inches) in
standard length
Fish measurement is the measuring of individual fish and various parts of fish anatomy, their anatomies, for data used in many areas of ichthyology, including Taxonomy (biology), taxonomy and fishery biology.
Overall length
Standard length (SL) is ...
.
''Abudefduf nigrimargo'' was first described in 2018 by Kunto Wibowo of the
Indonesian Institute of Sciences
The Indonesian Institute of Sciences (, or LIPI) was the governmental authority for science and research in Indonesia. It consisted of 47 research centers in the fields ranging from social to natural sciences.
With the enactment of Presidential D ...
, Keita Koeda of the
University of the Ryukyus
The , abbreviated to , is a Japanese national university in Nishihara, Okinawa, Japan. Established in 1950, it is the westernmost national university of Japan and the largest public university in Okinawa Prefecture. Located in the Senbaru ne ...
, Nozomu Muto of
Tokai University
is a private non-sectarian higher education institution located in Tokyo, Japan. It was founded by Dr. Shigeyoshi Matsumae.
It was accredited under Japan's old educational system in 1946 and under the new system in 1950. In 2008, Tokai Uni ...
, and