Denticetopsis Ferraris 1996
Creators: name: Vari, Richard P.
name: Ferraris Jr, Carl J.
name: de Pinna, Mário C. C.
Publisher: name: Zenodo
Year: 2005
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Actinopterygii
Siluriformes
Cetopsidae
Denticetopsis

description: Genus <i>Denticetopsis</i> Ferraris, 1996 <i>Denticetopsis</i> Ferraris, 1996: 162 [type species: <i>Denticetopsis sauli</i> Ferraris, 1996, by original designation]. <b>Diagnosis.</b> <i>Denticetopsis</i> can be differentiated from all other members of the Cetopsinae by the following features. The caudal-fin margin is either shallowly-forked or obliquely-truncate with the outer most rays no more than one and one-half times the length of the inner most rays (<i>versus</i> one and threequarters to two times that length in other genera of the Cetopsinae). The medial most pelvic-fin ray has a membranous attachment to the body for the basal one-third to onefourth of its length (<i>versus</i> an attachment more typically along the basal one-half of the ray, respectively). The possession of a first pectoral-fin ray that is spinous for the basal one-half of its length further separates <i>Denticetopsis</i> from <i>Cetopsis</i> and <i>Paracetopsis</i> both of which lack a spinous first pectoralfin ray. <i>Denticetopsis</i> is further distinguished from <i>Cetopsidium</i> in the lack of the dorsal-spine locking mechanism that is present in the latter genus and in the having a lateral line extending either only onto the abdomen or distinctly further posteriorly onto the caudal peduncle (<i>versus</i> terminating above the base of the anal fin, receptively). <b>Remarks.</b> The original concept of <i>Denticetopsis</i> by Ferraris (1996: 162) was restricted to two species, <i>D. royeroi</i> and D. <i>sauli</i> that have proved to be a subunit of a larger clade (unpublished results) that also includes two species previously assigned to <i>Pseudocetopsis</i> (<i>D. macilenta, D. praecox</i>) together with three species described as new in this publication (<i>D. epa, D. iwokrama, D. seducta</i>). A single specimen of <i>Denticetopsis</i> in poor condition from an unspecified locality in the rio Gurupi basin, State of Maranhão, northeastern Brazil (MZUSP 42444, formerly MPEG 2660) does not fit the diagnosis of any of the species of <i>Denticetopsis</i> recognized in this study. In addition this sample represents the only record of <i>Denticetopsis</i> from the rivers of Northeastern Brazil. This specimen may very well represent another undescribed species of <i>Denticetopsis</i> given several differences between that individual and other examined samples of the genus, in addition to the geographic separation of rio Gurupi basin from the known ranges of the other species of <i>Denticetopsis</i> recognized in this study. We defer further action on the question of the identity of this specimen until such time as more extensive series of recently collected specimens of <i>Denticetopsis</i> from the rio Gurupi become available.
description: Published as part of <i>Vari, Richard P., Ferraris Jr, Carl J. &amp; de Pinna, Mário C. C., 2005, The Neotropical whale catfishes (Siluriformes: Cetopsidae: Cetopsinae), a revisionary study, pp. 127-238 in Neotropical Ichthyology 3 (2)</i> on page 206, DOI: 10.1590/S1679-62252005000200001, http://zenodo.org/record/5418569
description: {"references": ["Ferraris, C. J., Jr. 1996. Denticetopsis, a new genus of South American whale catfish (Siluriformes: Cetopsidae, Cetopsinae), with two new species. Proceedings of the CaliforniaAcademy of Sciences, 49 (6): 161 - 170."]}