''Paraploactis'' 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 marine

ray-finned fish Actinopterygii (; ), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish that comprise over 50% of living vertebrate species. They are so called because of their lightly built fins made of webbings of sk ...

velvetfish Little velvetfishes or simply velvetfishes are a Family (biology), family, the Aploactinidae, of marine ray-finned fishes classified within the order Scorpaeniformes. They are small fish that have skin with a velvet texture. They live on the sea ...

es belonging to 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 ...

Aploactinidae Little velvetfishes or simply velvetfishes are a family, the Aploactinidae, of marine ray-finned fishes classified within the order Scorpaeniformes. They are small fish that have skin with a velvet texture. They live on the sea bottom close to t ...

. The genus is found the

Indo-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 ...

Taxonomy

''Paraploactis'' was first described as a genus in 1864 by the

Dutch Dutch or Nederlands commonly refers to: * Something of, from, or related to the Netherlands ** Dutch people as an ethnic group () ** Dutch nationality law, history and regulations of Dutch citizenship () ** Dutch language () * In specific terms, i ...

physician A physician, medical practitioner (British English), medical doctor, or simply doctor is a health professional who practices medicine, which is concerned with promoting, maintaining or restoring health through the Medical education, study, Med ...

herpetologist Herpetology (from Ancient Greek ἑρπετόν ''herpetón'', meaning "reptile" or "creeping animal") is a branch of zoology concerned with the study of amphibians (including frogs, salamanders, and caecilians (Gymnophiona)) and reptiles (in ...

and

ichthyologist Ichthyology is the branch of zoology devoted to the study of fish, including bony fish (Osteichthyes), cartilaginous fish (Chondrichthyes), and jawless fish (Agnatha). According to FishBase, 35,800 species of fish had been described as of March 2 ...

Pieter Bleeker Pieter Bleeker (10 July 1819 – 24 January 1878) was a Dutch medical doctor, Ichthyology, ichthyologist, and Herpetology, herpetologist. He was famous for the ''Atlas Ichthyologique des Indes Orientales Néêrlandaises'', his monumental work on ...

when he described its

type species In International_Code_of_Zoological_Nomenclature, zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the spe ...

''P. trachyderma'' from Australia, Bleeker designated it as the type species in the title of his description as well as it being the only species in what was then considered to be a

monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unisp ...

genus. This genus is

classified Classified may refer to: General *Classified information, material that a government body deems to be sensitive *Classified advertising or "classifieds" Music *Classified (rapper) (born 1977), Canadian rapper * The Classified, a 1980s American ro ...

within the family Aploactinidae in the

suborder Order () is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between family and class. In biological classification, the order is a taxonomic rank used in the classification of organisms and recognized ...

Scorpaenoidei Scorpaenoidei is a suborder of Actinopterygii, ray-finned fishes, part of the Order (biology), order Perciformes, that includes the scorpionfishes, lionfishes and velvetfishes. This suborder is at its most diverse in the Pacific and Indian Oceans ...

within the order

Scorpaeniformes The Scorpaeniformes are a diverse Order (biology), order of Actinopterygii, ray-finned fish, including the lionfishes and sculpins, but have also been called the Scleroparei. It is one of the five largest orders of bony fishes by number of spec ...

, although this family is also treated as a subfamily of the

stonefish ''Synanceia'' is a genus of Actinopterygii, ray-finned fish belonging to the subfamily Synanceiinae, the stonefish, which is Taxonomy (biology), classified within the Family (biology), family Scorpaenidae, the scorpionfish and relatives. Stone ...

family

Synanceiidae Synanceiinae is a subfamily of Venom, venomous ray-finned fishes, waspfishes, which is classification of life, classified as part of the family Scorpaenidae, the scorpionfishes and their relatives. These fishes are found in the Indo-Pacific ocean ...

within the Scorpaenoidei, which in turn is treated as a

superfamily SUPERFAMILY is a database and search platform of structural and functional annotation for all proteins and genomes. It classifies amino acid sequences into known structural domains, especially into SCOP superfamilies. Domains are functional, str ...

within the order Perciformes. ''P. kagoshimensis'', ''P. obbesi'', ''P. taprobanensis'' and ''P. hongkongensis'' are thought to form a species complex. The name of the genus, ''Paraploactis'' prefixed the type genus of this family, '' Aploactis'' with ''para'', meaning "near", the genus being described as being between ''Aploactis'' and '' Trichopleura''.

Species

There are currently seven recognized species in this genus: * '' Paraploactis hongkongiensis'' ( W. L. Y. Chan, 1966) * '' Paraploactis intonsa'' Poss & Eschmeyer, 1978 (Bearded velvetfish) * '' Paraploactis kagoshimensis'' ( Ishikawa, 1904) * '' Paraploactis obbesi'' ( M. C. W. Weber, 1913) * '' Paraploactis pulvinus'' Poss & Eschmeyer, 1978 (Pillow velvetfish) * '' Paraploactis taprobanensis'' ( Whitley, 1933) * '' Paraploactis trachyderma''

Bleeker Bleeker is a Dutch occupational surname. Bleeker is an old spelling of ''(linnen)bleker'' ("linen bleacher").lateral line The lateral line, also called the lateral line organ (LLO), is a system of sensory organs found in fish, used to detect movement, vibration, and pressure gradients in the surrounding water. The sensory ability is achieved via modified epithelia ...

. The head has an elaborate sculpture of ridges and blunt spines, in some species there is a fleshy pad on the throat. The frontal bone has two obvious ridges that diverge to the rear, creating a pear-shaped depression separating them. The origin of the

dorsal fin A dorsal fin is a fin on the back of most marine and freshwater vertebrates. Dorsal fins have evolved independently several times through convergent evolution adapting to marine environments, so the fins are not all homologous. They are found ...

lies over the centre to the rear of the eye. The

has a deep not between the third and fourth spines and the front 4 spines are almost a separate fin. The spines in the dorsal and

anal 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 o ...

s are frequently rather flexible and closely resemble the soft rays of those fins. The fin rays are all simple, i.e. they do not have branches. The dorsal fin has 13-15 spines and 8-10 soft rays while the anal fin typically has a single spine, although there are sometimes 2, and 7-10 soft rays. There are 13-14, normally 14, unbranched fin rays in the

pectoral fin Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish aquatic locomotion, swim. Apart from the tail or caudal fin, fish fins have no direct connection with the vertebral column ...

s and the pelvic-fin has a single spine and 3 soft rays. The lateral line scales are in the form of obvious knobs. especially near the head and there are 11-15 such scales in the line. The jaws have tiny villiform teeth, no teeth on the palatine and the vomerine may have very small teeth or they are absent too. These are small fishes which have a maximum known

total length Fish measurement is the measuring of individual fish and various parts of their anatomies, for data used in many areas of ichthyology, including taxonomy and fishery biology. Overall length Standard length (SL) is the length of a fish measured f ...

of .

Distribution

''Paraploactis'' velvetfishes are found in the eastern Indian Ocean as far west as Sri Lanka and the western Pacific Ocean.

References

{{Taxonbar, from=Q1592791 Aploactinidae Taxa named by Pieter Bleeker