Notarius Gill
Creators: name: Ricardo Betancur-R.
name: Arturo Acero P.
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Siluriformes
Ariidae
Notarius

description: [[Notarius Gill]]
Updated key to described species of the genus Notarius from the eastern Pacific
[Modified from Betancur-R. and Acero P. (2004)]
The EP species of the genus Notarius are distinguished from other EP ariid taxa by the following combination of features: humeral process pointed, triangular to elongated (vs. fan-shaped in Galeichthys peruvianus Lütken); three pairs of barbels present (vs. only two pairs in Bagre Cloquet); fleshy furrow between posterior nostrils absent [vs. present in Sciades dowii (Gill)]; no narrow groove in median depression of head (vs. present in ‘Arius’ platypogon Günther, Ariopsis Gill, and Cathorops Jordan & Gilbert); no granules or spinulations on anterior surface of head shield [vs. present in Cathorops dasycephalus (Günther)]; presence of vomerine tooth patches (vs. absent in Cathorops, ‘Arius’ labiatus Boulenger and ‘Hexanematichthys’ henni Eigenmann) and no gill rakers on rear surfaces of first two gill arches (vs. present in Cathorops, except for C. dasycephalus).
1 Predorsal plate large, square or hexagonal and shaped like a forward pointing arrow... ..................................................................................................................... N. troschelii
- Predorsal plate narrow and crescent-shaped ................................................................. 2
2 Gill rakers on second arch 5-6; anal fin rays 23-28 .............................. N. lentiginosus
- Gill rakers on second arch 8 or more; anal fin rays 17-22 ........................................... 3
3 Epioccipital bones invading skull surface, where they cover a broad area; epioccipitals and supraoccipital forming a basally wide complex process that tapers drastically posteriorly(Fig. 1A); maxillary barbels long, their length in adult specimens 26.7-30.3% SL .............................................................................................................. N. insculptus
- Epioccipital bones not invading skull surface, or invading only a small area (Fig. 1B); complex process absent; maxillary barbels short, their length in adult specimens 25.6% SL or less .......................................................................................................... 4
4 Mouth width 8.4-11.8% SL; gill rakers on second arch 8-13; eye diameter 3.5-4.9% SL .................................................................................................................................. 5
- Mouth width 12.6-16.8% SL; gill rakers on second arch 13-16; eye diameter 2.5- 3.7% SL ......................................................................................................................... 7
5 Gill rakers on first arch 8-10 ............................................... N. planiceps /aff. planiceps
- Gill rakers on first arch 11-13 ....................................................................................... 6
6 Mandibulary barbel length 14.1-17.1% SL; anterior internarial distance 6.1-6.9% SL; caudal peduncle depth 7.0-7.4% SL ............................................. N. armbrusteri n. sp.
- Mandibulary barbel length 10.2-13.1% SL; anterior internarial distance 4.8-5.7% SL; caudal peduncle depth 6.1-6.7% SL .................................................................... N. biffi
7 Supraoccipital process elongated, its base width 1.6-1.7 in its length ........... N. cookei
- Supraoccipital process wide and triangular in shape, its base width 1.0-1.3 in its length ............................................................................................................ N. kessleri
description: Published as part of Ricardo Betancur-R. & Arturo Acero P., 2006, A new species of Notarius (Siluriformes: Ariidae) from the Colombian Pacific., pp. 47-59 in Zootaxa 1249 on page 58