A new genus of armored catfish (Siluriformes: Loricariidae) from the Greater Amazon, with a review of the species and description of five new species
Author
Reis, Roberto E.
PontifÍcia Universidade Católica do Rio Grande do Sul. Av. Ipiranga, 6681, P. O. Box 1429, 90619 - 900 Porto Alegre, RS, Brazil.
reis@pucrs.br
Author
Lehmann A., Pablo
Laboratório de Ictiologia, Universidade do Vale do Rio dos Sinos. Av. Unisinos, 950, 93022 - 000 São Leopoldo, RS, Brazil.
pablole@unisinos.br.
text
Neotropical Ichthyology
2022
e 220002
2022-07-08
20
2
1
100
http://dx.doi.org/10.1590/1982-0224-2022-0002
journal article
10.1590/1982-0224-2022-0002
1f6c7a0d-e5f8-479d-be08-03fd894b7cfe
1982-0224
13350428
0A755C8D-B807-41CF-825B-BD3209119D54
TABLE 5 | Descriptive morphometrics of Rhinotocinclus species. Values given as percent of standard length or head length. Range includes the holotype (Hol), SD = standard deviation. | | R. kwarup n=20 | | | R. discolor n=20 | | | R. pilosus n=20 | | | R. isabelae n=15 | |
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| Character | | | | | | | | | | | | | | | | | | | | |
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| Hol | Low | High | Mean | SD | Hol | Low | High | Mean | SD | Hol | Low | High | Mean | SD | Hol | Low | High | Mean | SD |
|---|
| Standard length (mm) | 21.6 | 18.8 | 23.7 | 21.3 | | 24.4 | 21.6 | 25.2 | 23.3 | | 22.6 | 18.1 | 22.6 | 20.2 | | 17.6 | 14.6 | 17.9 | 16.6 | |
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| Percent of SL |
|---|
| Body depth | 15.1 | 13.6 | 17.2 | 15.7 | 0.88 | 16.2 | 16.2 | 18.7 | 17.2 | 0.71 | 16.9 | 15.4 | 18.9 | 17.3 | 0.84 | 19.9 | 17.8 | 20.9 | 19.4 | 0.85 |
|---|
| Predosal distance | 44.5 | 44.5 | 48.4 | 46.7 | 1.11 | 46.6 | 46.2 | 50.3 | 47.7 | 1.13 | 48.6 | 47.8 | 51.4 | 49.8 | 1.00 | 48.8 | 45.7 | 50.9 | 48.6 | 1.48 |
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| Prepelvic distance | 42.4 | 40.6 | 44.9 | 42.5 | 0.98 | 42.6 | 42.1 | 46.0 | 43.8 | 1.17 | 45.1 | 44.1 | 48.2 | 46.3 | 1.05 | 44.3 | 41.1 | 48.4 | 45.3 | 1.75 |
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| Preanal distance | 65.5 | 62.2 | 67.5 | 65.2 | 1.40 | 64.6 | 63.6 | 67.1 | 65.4 | 1.03 | 68.6 | 65.9 | 71.8 | 69.1 | 1.36 | 66.8 | 64.3 | 69.7 | 67.1 | 1.80 |
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| Preadipose distance | 78.2 | 72.3 | 80.0 | 76.7 | 1.65 | 75.6 | 74.1 | 78.3 | 76.2 | 1.04 | 78.4 | 75.4 | 80.3 | 78.3 | 1.22 | 74.8 | 74.8 | 79.8 | 77.0 | 1.39 |
|---|
| Dorsal-fin spine length | 23.7 | 20.5 | 27.7 | 24.0 | 1.59 | 25.3 | 23.2 | 25.3 | 24.1 | 0.62 | 24.2 | 21.1 | 25.3 | 23.1 | 0.92 | 25.1 | 22.6 | 26.0 | 24.4 | 0.86 |
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| Anal-fin unbranched ray length | 16.0 | 12.1 | 17.1 | 14.8 | 1.12 | 15.6 | 13.5 | 17.3 | 16.1 | 0.80 | 13.6 | 12.4 | 16.4 | 14.4 | 1.01 | 17.1 | 16.6 | 20.4 | 18.1 | 0.99 |
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| Adipose-fin spine length | 7.2 | 5.3 | 8.4 | 7.1 | 0.74 | 8.6 | 7.6 | 10.3 | 8.5 | 0.82 | 6.1 | 6.0 | 7.9 | 6.7 | 0.51 | 7.4 | 7.0 | 9.4 | 8.0 | 0.59 |
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| Pectoral-fin spine length | 28.4 | 23.9 | 29.6 | 26.6 | 1.62 | 26.9 | 24.8 | 27.3 | 26.4 | 0.65 | 28.4 | 24.7 | 29.8 | 27.1 | 1.24 | 29.2 | 27.9 | 30.2 | 29.2 | 0.62 |
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| Caudal peduncle depth | 8.3 | 7.3 | 8.6 | 7.9 | 0.35 | 7.7 | 7.7 | 8.6 | 8.2 | 0.25 | 6.4 | 6.3 | 7.5 | 6.7 | 0.30 | 8.1 | 8.1 | 8.8 | 8.5 | 0.24 |
|---|
| Dorsal-adipose fin distance | 20.0 | 18.9 | 20.9 | 19.8 | 0.52 | 16.6 | 13.3 | 18.1 | 16.0 | 1.51 | 16.7 | 12.8 | 17.5 | 15.2 | 1.49 | 14.4 | 12.3 | 16.5 | 14.7 | 1.45 |
|---|
| Dorsal-fin base length | 12.2 | 9.5 | 12.7 | 11.3 | 0.93 | 11.8 | 10.1 | 12.9 | 12.0 | 0.69 | 12.7 | 11.2 | 14.7 | 12.3 | 1.01 | 12.9 | 11.6 | 13.7 | 12.6 | 0.59 |
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| Lower caudal-fin principal ray | 23.9 | 21.1 | 28.7 | 25.0 | 1.81 | 28.4 | 25.2 | 29.7 | 27.5 | 1.35 | 24.0 | 21.3 | 27.3 | 23.7 | 1.32 | 27.4 | 23.4 | 29.1 | 27.4 | 1.43 |
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| Cleithral width | 27.5 | 24.4 | 27.5 | 26.0 | 0.97 | 26.6 | 26.5 | 28.3 | 27.2 | 0.52 | 27.3 | 27.2 | 29.0 | 28.0 | 0.51 | 31.6 | 29.5 | 31.6 | 30.5 | 0.56 |
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| Head length | 35.3 | 32.4 | 37.4 | 35.4 | 1.60 | 37.0 | 36.8 | 39.3 | 37.8 | 0.72 | 38.9 | 38.9 | 43.1 | 41.7 | 0.97 | 40.2 | 39.4 | 42.7 | 40.8 | 1.05 |
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| Percent of HL |
|---|
| Head depth | 43.6 | 41.2 | 48.0 | 44.4 | 1.90 | 42.1 | 39.5 | 48.4 | 42.8 | 2.61 | 41.7 | 36.2 | 43.0 | 39.9 | 1.66 | 47.2 | 46.4 | 50.8 | 48.6 | 1.30 |
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| Interorbital distance | 37.1 | 31.9 | 37.7 | 35.3 | 1.76 | 30.9 | 28.7 | 34.4 | 31.0 | 1.45 | 36.7 | 32.0 | 36.7 | 33.5 | 1.12 | 34.5 | 33.0 | 36.3 | 34.9 | 1.02 |
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| Orbital horizontal diameter | 18.8 | 16.8 | 21.3 | 18.6 | 1.36 | 18.1 | 15.4 | 19.7 | 17.7 | 1.23 | 18.4 | 15.0 | 18.9 | 16.8 | 0.95 | 16.5 | 15.8 | 17.8 | 16.8 | 0.63 |
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| Snout length | 52.4 | 50.0 | 55.8 | 53.0 | 1.30 | 52.7 | 49.7 | 58.5 | 53.0 | 2.41 | 57.3 | 53.4 | 57.3 | 55.1 | 1.11 | 52.5 | 51.5 | 54.7 | 53.3 | 1.03 |
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| Internarial distance | 9.1 | 6.4 | 10.4 | 8.5 | 0.99 | 8.3 | 7.7 | 10.8 | 9.0 | 0.85 | 11.1 | 8.6 | 11.8 | 10.1 | 0.95 | 10.3 | 9.6 | 11.6 | 10.7 | 0.55 |
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| Tooth count |
|---|
| Premaxilla | - | 28 | 34 | 30.2 | 2.13 | 24 | 23 | 26 | 24.3 | 0.99 | 35 | 31 | 37 | 33.8 | 1.81 | 22 | 21.0 | 29.0 | 24.3 | 2.46 |
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| Dentary | - | 27 | 33 | 29.8 | 1.66 | 24 | 19 | 24 | 21.9 | 1.58 | 34 | 29 | 35 | 31.8 | 1.96 | 20 | 18.0 | 24.0 | 21.5 | 2.20 |
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