Alexandre P. Marceniuk & Naércio A. Menezes, 2007, Systematics of the family Ariidae (Ostariophysi, Siluriformes), with a redefinition of the genera., Zootaxa 1416, pp. 1-126: 81-82

publication ID


publication LSID

persistent identifier

treatment provided by


scientific name



Notarius  ZBK  Gill, 1863

(fig. 70)

Notarius  ZBK  Gill, 1863: 171. Type species: Arius grandicassis  ZBK  Valenciennes, 1840. Type by monotypy. Gender: masculine.

Sciadeops  ZBK  Fowler, 1944: 211. Type species: Sciades troschelii  ZBK  Gill, 1863. Type by original designation and also monotypy(subgenus of Sciades  ). Gender: masculine.

Diagnosis. Notarius  ZBK  can be distinguished from all other genera in the Ariidae  through two non-exclusive characters: (1) first external branchiostegal ray very thin at proximal portion, wide at distal portion (shared with Arius caelatus  ZBK  , Bagre  , Batrachocephalus  ZBK  , Brustiarius  ZBK  , Carlarius  , Cochlefelis  ZBK  , Doiichthys  ZBK  , Galeichthys  ZBK  , Ketengus  ZBK  , Neoarius  ZBK  , Netuma  , Osteogeneiosus  ZBK  , Sciades emphysetus  ZBK  , S. passany  and S. proops  ); (2) 15 or more ribs [shared with Bagre  , Carlarius  , Cochlefelis  ZBK  , Genidens  ZBK  , Neoarius  ZBK  , Netuma  , Plicofollis  ZBK  (with exception of P. platystomus  ) and Sciades  ].

Supplementary morphological characters. Cephalic shield granulated visible under the skin; lateral ethmoid and frontal bones limiting a moderately developed fenestra visible under the skin; medial groove of neurocranium limited by frontal bones and/or on supraoccipital absent (except in N. planiceps  ); posterior cranial fontanel well developed, with oval shaped; fenestra limited by supraoccipital, pterotic and sphenotic absent; fossa limited by pterotic, supracleithrum and extrascapular relatively large; epioccipital not invading dorsal portion of cephalic shield; occipital process triangular, moderately long and wide, progressively narrower toward its posterior part (except in N. grandicassis  ); anterior and median nuchal plates fused and indistinct, forming a structure of semi-lunar aspect; tooth plates associated with vomer round; accessory tooth plates well developed, triangular or oval shaped, bearing conical teeth; maxillary barbel fleshy and cylindrical; two pairs of mental barbels; base of adipose fin very long, as long as anal-fin base; lateral line not bifurcated at caudal region, reaching base of caudal-fin upper lobe; cleithrum wide, with second dorsal process on its upper portion; posterior cleithral process moderately developed and distinct of second dorsal process of cleithrum.

Remarks. The nominal genus Sciadeops  ZBK  is a junior synonym of Notarius  ZBK  . The inclusion of N. planiceps  (Steindachner, 1877) in the genus is supported by supplementary morphological characters and its expected that further studies provide better data for its allocation. N. kessleri  (Steindachner, 1877) was preliminary included based on the presence of diagnostic features of the genus in preserved specimens. No specimens of N. armbrusteri  Betancur-R. & Acero, 2006, N. biffi  ZBK  Betancur-R. & Acero, 2004, N. cookei  (Acero & Betancur-R., 2002), N. insculptus  (Jordan & Gilbert, 1883), N. neogranatensis  (Acero & Betancur-R., 2002) and N. osculus  (Jordan & Gilbert, 1883) could be obtained for examination and their inclusion in Notarius  ZBK  is mainly based on the results obtained by Betancur-R. & Acero (2004).

Distribution and habitat. Eastern and western Central and South America, marine and brackish waters.