''Xiurenbagrus'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

of torrent catfishes (

order Order, ORDER or Orders may refer to: * A socio-political or established or existing order, e.g. World order, Ancien Regime, Pax Britannica * Categorization, the process in which ideas and objects are recognized, differentiated, and understood ...

Siluriformes) of the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Amblycipitidae The Amblycipitidae are a family of catfishes, commonly known as torrent catfishes. It includes three genera, '' Amblyceps'', '' Liobagrus'', and '' Xiurenbagrus'', and about 36 species. Taxonomy The family Amblycipitidae is a monophyletic group ...

. It includes three

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), ...

Taxonomy

''X. xiurenensis'' was first described in 1981 as ''Liobagrus xiurenensis''. However, it was realized that ''Liobagrus'' would not be

monophyletic In biological cladistics for the classification of organisms, monophyly is the condition of a taxonomic grouping being a clade – that is, a grouping of organisms which meets these criteria: # the grouping contains its own most recent co ...

with the inclusion of this species, so ''Xiurenbagrus'' was erected. The genera ''Amblyceps'' and ''Liobagrus'' are

sister group In phylogenetics, a sister group or sister taxon, also called an adelphotaxon, comprises the closest relative(s) of another given unit in an evolutionary tree. Definition The expression is most easily illustrated by a cladogram: Taxon A and ...

pair that is, in turn, sister to ''Xiurenbagrus''.

Species

* '' Xiurenbagrus dorsalis'' Hui,

Yang Yang may refer to: * Yang, in yin and yang, one half of the two symbolic polarities in Chinese philosophy * Korean yang, former unit of currency of Korea from 1892 to 1902 * YANG, a data modeling language for the NETCONF network configuration p ...

& Zheng, 2014.Xiu, L-H, J Yang & H-F Zheng, 2014. An extraordinary new blind catfish, Xiurenbagrus dorsalis (Teleostei: Siluriformes: Amblycipitidae), from Guangxi, China. Zootaxa 3835: 376–380 * '' Xiurenbagrus gigas'' Zhao,

Lan Lan or LAN may refer to: Science and technology * Local asymptotic normality, a fundamental property of regular models in statistics * Longitude of the ascending node, one of the orbital elements used to specify the orbit of an object in space * ...

Zhang Zhang may refer to: Chinese culture, etc. * Zhang (surname) (張/张), common Chinese surname ** Zhang (surname 章), a rarer Chinese surname * Zhang County (漳县), of Dingxi, Gansu * Zhang River (漳河), a river flowing mainly in Henan * ''Zha ...

, 2004 * '' Xiurenbagrus xiurenensis'' Yue, 1981

Distribution

''X. gigas'' is known only from the Hongshuihe River which belongs to the

Xijiang River The Xi River (; ) or Si-Kiang is the western tributary of the Pearl River in southern China. It is formed by the confluence of the Gui and Xun Rivers in Wuzhou, Guangxi. It originates from the eastern foot of the Maxiong Mountain in Qujing C ...

, the largest

tributary A tributary, or an ''affluent'', is a stream or river that flows into a larger stream (''main stem'' or ''"parent"''), river, or a lake. A tributary does not flow directly into a sea or ocean. Tributaries, and the main stem river into which they ...

of the

Pearl River The Pearl River (, or ) is an extensive river system in southern China. "Pearl River" is often also used as a catch-all for the watersheds of the Pearl tributaries within Guangdong, specifically the Xi ('west'), Bei ('north'), and Dong ( ...

basin in

China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...

. ''X. xiurenensis'' inhabits the Pearl River, northward to

Lijiang River The Li River or Li Jiang ( zh, c=漓江, p=Lí Jiāng) is the name for the upper reaches of the Gui River in northeastern Guangxi, China. It is part of the Xijiang River system in the Pearl River basin, flowing from Xing'an County to Pingle Cou ...

near

Guilin Guilin (Standard Zhuang: ''Gveilinz''), postal map romanization, formerly romanization of Chinese, romanized as Kweilin, is a prefecture-level city in the northeast of China's Guangxi, Guangxi Zhuang Autonomous Region. It is situated on the we ...

Guangxi Guangxi,; officially the Guangxi Zhuang Autonomous Region, is an Autonomous regions of China, autonomous region of the China, People's Republic of China, located in South China and bordering Vietnam (Hà Giang Province, Hà Giang, Cao Bằn ...

, southward to

Zuojiang River The Zuo River (,) is a river of Guangxi, China. It begins from the confluence of the Bằng River and Kỳ Cùng River near Longzhou and joins the You River ("Right River") near Nanning to form the Yong River. These rivers form part of the Pearl ...

near

Longzhou Longzhou County (; Zhuang: ) is a county of southwestern Guangxi, China, bordering Cao Bằng province, Vietnam. It is under the jurisdiction of the prefecture-level city of Chongzuo. Longzhou lies in a circular valley at the junction of the Xu ...

, Guangxi.

Description

''Xiurenbagrus'' species have a

ventral Standard anatomical terms of location are used to describe unambiguously the anatomy of humans and other animals. The terms, typically derived from Latin or Greek roots, describe something in its standard anatomical position. This position prov ...

mouth. The fin margins are pale. The

adipose fin Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim. Apart from the tail or caudal fin, fish fins have no direct connection with the back bone and are supported only b ...

is not confluent with the

caudal fin Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim. Apart from the tail or caudal fin, fish fins have no direct connection with the back bone and are supported only ...

and has a free lobe. ''X. gigas'' is the largest species of amblycipitid and grows to about 16.5

centimetre upright=1.35, Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales. The microwave is in-between 1 meter to 1 millimeter. A centimetre (International spelling) or centimeter (American ...

s (6.5 in) SL. ''X. xiurenensis'' is a small- to medium-sized amblycipitid, growing to about 10.7 cm (4.2 in) SL.

Ecology

Little is known about the ecology of these fishes. ''X. xiurenensis'' is benthic and inhabits streams in the Nanling mountain range. The stomach contents have been studied to contain parts of

arthropod Arthropods ( ) are invertebrates in the phylum Arthropoda. They possess an arthropod exoskeleton, exoskeleton with a cuticle made of chitin, often Mineralization (biology), mineralised with calcium carbonate, a body with differentiated (Metam ...

References

{{Taxonbar, from=Q3016892 Amblycipitidae Fish of Asia Fish of China Catfish genera Freshwater fish genera