Journal Article
An enigmatic new Loricariid (Actinopterygii:Siluriformes) from relictual upper reaches of Chapada Diamantina, Bahia, Brazil
Pereira, E.H.L., de A. Santos, A.C., de Pinna, M.C.C. and Reis, R.E.
Record Number:
6177
Year:
2019
Journal:
107
Pages:
597-605
Volume:
107
Abstract:
Parotocinclus adamanteus, new species, is described from a series of specimens collected in the upper portion of the Rio Paraguacu basin, a coastal river withintheChapadaDiamantinadomain,alargeplateauontheStateofBahiain
northeasternBrazil.Thedescriptionofthisnewspeciesrepresentsthefirstrecordofamemberofthe
Hypoptopomatinaefromthisrelictualarea.Thenewspeciesisdiagnosedfromother Parotocinclus by havingadistinct
rostralborderformingafleshyintumescenceonthelateralportionofheadornamentedwithmoderately
hypertrophiedodontodesinadultmales.Itisalsodiagnosedfromcongenersbyaremarkablesecondarysexual
dimorphismintheshapeofthepelvicfin,inwhichthebranchedraysofmalesdecreaseinsize,resultinginapointed
posteriorfinmargin(branchedpelvic-finraysinfemaleshaveapproximatelythesamesize,producingaroundposterior
fin margin).Inaddition,thenewspeciescanbefurtherdistinguishedfromotherspeciesof Parotocinclus by lackinga
rostral platecoveringthetipofthemesethmoidanteriorly,bylackingabdominalplatesbetweenthepectoralgirdle
and theanus,byhavingnumerouspremaxillaryteeth(45–61),andbyhavingashortandmesiallyexpandedventral
portion ofthecheekcanalplate.Recentphylogeneticanalysisindicatesthat Parotocinclusadamanteus, new species,is
closely relatedto P. jequi, P. prata, and P. robustus.
Times Cited:
2