{{Short description|Genus of fishes}} {{Automatic taxobox | image = Histoire naturelle des poissons (Pl. 82) (7949972448).jpg | image_caption = Rogadius asper syn. Platycephalus asper | taxon = Rogadius | authority = D. S. Jordan & R. E. Richardson, 1908 | type_species = ''Platycephalus asper'' | type_species_authority = Cuvier, 1829<ref name = CofF>{{Cof family | family = Platycephalidae | access-date = 18 July 2022}}</ref> }}
'''''Rogadius''''' is a genus of marine, demersal ray-finned fish belonging to the family Platycephalidae. These fishes are native to the Indian Ocean and the western Pacific Ocean.
==Taxonomy== ''Rogadius'' was first formally proposed as a genus in 1908 by the American ichthyologists David Starr Jordan and Robert Earl Richardson with ''Platycephalus asper'', which had been described in 1829 by Georges Cuvier from Nagasaki, designated as its type species.<ref name = CofF/><ref name = CofF2>{{Cof genus|genus=Rogadius|access-date=19 July 2022}}</ref> This genus is classified within the family Playtcephalidae, the flatheads which the 5th edition of ''Fishes of the World'' classifies within the suborder Platycephaloidei in the order Scorpaeniformes.<ref name = Nelson5>{{cite book |title=Fishes of the World |edition=5th |author1=J. S. Nelson |author2=T. C. Grande |author3=M. V. H. Wilson |year=2016 |pages= 467–495 |publisher=Wiley |isbn= 978-1-118-34233-6 |url=https://sites.google.com/site/fotw5th/ }}</ref>
==Etymology== ''Rogadius'' is a latinisation of ''rogad'', an Arabic name for the bartail flathead (''Platycephalus indicus'').<ref name = ETYFish>{{cite web | url = https://etyfish.org/perciformes11/ | title = Order Perciformes (Part 11): Suborder Platycephaloidei: Families Bembridae, Parabembridae, Hoplichthyidae, Platycephalidae and Plectrogeniidae | work = The ETYFish Project Fish Name Etymology Database | editor1= Christopher Scharpf | editor2 = Kenneth J. Lazara | name-list-style = amp |date = 7 December 2021 | access-date = 19 July 2022 | publisher = Christopher Scharpf and Kenneth J. Lazara}}</ref>
==Species== ''Rogadius'' contains eight species:<ref name = Fishbase>{{FishBase genus | genus = Rogadius| month = February | year = 2022}}</ref><ref name=Knapp2012/><ref name=":0">{{Cite journal |last1=Mat Jaafar |first1=Tun Nurul Aimi |last2=Seah |first2=Ying Giat |last3=Imamura |first3=Hisashi |last4=Motomura |first4=Hiroyuki |last5=Matsunuma |first5=Mizuki |title=Rogadius azizahae, a new flathead (Perciformes: Platycephalidae) from the South China Sea |url=https://onlinelibrary.wiley.com/doi/abs/10.1111/jfb.70135 |journal=Journal of Fish Biology |date=2025 |article-number=jfb.70135 |language=en |volume=n/a |issue=n/a |doi=10.1111/jfb.70135 |pmid=40755128 |issn=1095-8649|url-access=subscription }}</ref> * ''Rogadius asper'' <small>(Cuvier, 1829)</small> (Olive-tailed flathead) * ''Rogadius fehlmanni'' <small>L. W. Knapp, 2012</small><ref name=Knapp2012>{{cite journal | author = Knapp, L.W. | year = 2012 | title = ''Rogadius fehlmanni'', a new flathead fish (Scorpaeniformes: Platycephalidae) from Somalia | journal = Proceedings of the Biological Society of Washington | volume = 125 | issue = 1 | pages = 61–65 | doi = 10.2988/11-20.1}}</ref> * ''Rogadius mcgroutheri'' <small>Imamura, 2007</small> (McGrouther's flathead) * ''Rogadius patriciae'' <small>L. W. Knapp, 1987</small> (Black-banded flathead) * ''Rogadius pristiger'' <small>(Cuvier, 1829)</small> (Thorny flathead) * ''Rogadius serratus'' <small>(Cuvier, 1829)</small> (Serrated flathead) * ''Rogadius welanderi'' <small>(L. P. Schultz, 1966)</small> (Welander's flathead) * ''Rogadius azizahae'' <small>(Nurul Aimi, 2025)</small> (Azizah's flathead)<ref name=":0" /> thumb|Serrated flathead (''Rogadius serratus'') ==Characteristics== ''Rogadius'' flatheads have two or more preopercular spines have at least two spines on the preoperculum, with the upper spine being the longest. There is no elongation of the upper lobe of the caudal fin with no elongated filament extending out from that fin. The first dorsal fin has between eight or nine spines. the second being equal in height to the third, while the second dorsal fin has no more than twelve soft rays. There are two separate patches of vomerine teeth. There are between 48 and 56 pored scales, each with two pores, on the lateral line with spines on the scales in the anterior portion of that line. The diagonal rows of scales run downwards and backwards over lateral line and the number of these rows is roughly about equal to the number of scales in the lateral line, typically with a difference of only one or two scales. The head has bony ridges which have many fine serrations on them and a single bony ridge on the side of the head underneath the eye with the lower margin of the suborbital not being clearly visible due to being turned inward. The lappet on the iris has two lobes.<ref name = FAO>{{cite book | editor1 =Carpenter, K.E. | editor2 = Niem, V.H. | title = FAO species identification guide for fishery purposes. The living marine resources of the Western Central Pacific. Volume 4. Bony fishes part 2 (Mugilidae to Carangidae) | publisher = FAO, Rome | year = 1999 | chapter = Platycephalidae Flatheads | author = L.W. Poss | pages = 2385–2421 | isbn = 9251043019}}</ref> The maximum length attained by these fishes varies from a standard length of {{cvt|11.2|cm}} in ''R. fehlmanni'' to a maximum total length of {{cvt|50|cm}} in ''R. pristiger''.<ref name = Fishbase/>
==Distribution== ''Rogadius'' flatheads are found in the Indian and Western Pacific Oceans from the Red Sea to Tonga,<ref name = Fishbase2>{{Fishbase|Rogadius|pristiger|month=February|year=2022}}</ref> north to southern Japan and south to Australia.<ref name = Fishbase3>{{Fishbase|Rogadius|asper|month=February|year=2022}}</ref>
==References== {{Reflist}}
{{Taxonbar|from=Q2173712}}
Category:Platycephalidae Category:Taxa named by David Starr Jordan Category:Taxa named by Robert Earl Richardson