Gymnotus carapo orientalis, Albert, 2017

Albert, James S., 2017, Revision of the polytypic electric fish Gymnotus carapo (Gymnotiformes, Teleostei), with descriptions of seven subspecies, Zootaxa 4318 (3), pp. 401-438 : 430-431

publication ID

https://doi.org/10.11646/zootaxa.4318.3.1

publication LSID

lsid:zoobank.org:pub:2848Cac4-F301-4A47-B6Cd-366051Ad2B5E

DOI

https://doi.org/10.5281/zenodo.6045085

persistent identifier

https://treatment.plazi.org/id/92168D11-E72D-4748-1CC4-FB96F942F9A6

treatment provided by

Plazi

scientific name

Gymnotus carapo orientalis
status

New Subspecies

Gymnotus carapo orientalis New Subspecies

Figure 3 View FIGURE 3 F, Tables 3 and 4

Holotype: MZUSP 30025 View Materials 237 mm, Brazil Pará, Río Tocantins, Río Itacaiuna , Serra Norte, Serra dos Carajás (05°05’S, 050°22’W). GoogleMaps

Paratypes: MZUSP 30025 View Materials (6), 165–235 mm, Brazil Pará, Río Tocantins, Río Itacaiuna , Serra Norte, Serra dos Carajás (05°05’S, 050°22’W). GoogleMaps

Non-Types: MCZ 45189 View Materials (19), 133–210 mm, Brazil Pará, Parauapebas, Ilha de Marajó , Río Tocantins, Río Arari , Cachoeira do Arari (01°01’S, 048°58’W) GoogleMaps . MZUSP 30008 View Materials (8), 173–253 mm, Brazil Pará, Río Trombetas, Río Itacaiunas, Caldeirão, Igarapé do Pojuca (approx. 00°45’S, 056°13’W) GoogleMaps . MZUSP 30025 View Materials (7), 165–237 mm, Brazil, Pará, Río Tocantins, Río Itacaiuna , Serra Norte, Serra dos Carajás (05°05’S, 050°22’W) GoogleMaps .

Description: Specimens of G. carapo from the eastern Amazon overlap substantially in morphometric and meristic PC-space with specimens from other localities ( Figures 4 View FIGURE 4 , 5 View FIGURE 5 , and 12). Gymnotus carapo orientalis is characterized by the following combination of statistically significant (p <0.01) traits when compared to the rest of the species as a whole (see Principal Components Analyses and t-tests): slender body (BD 67.9%–88.4% HL, mean 78.4% vs. 42.7%–106%, mean 85.0% in all other subspecies), slender head (HD 50.8%–60.9% HL, mean 55.2% vs. 44.0%–72.4%, mean 58.7% in all other subspecies), narrow head (HW 53.3%–64.4% HL, mean 56.3% vs. 49.1%–67.7%, mean 59.9% in all other subspecies) and short anal-fin length (AF 69.4%–86.6% TL, mean 75.9% vs. 70.9%–88.0%, mean 80.2% in all other subspecies).

Distribution: Known from the eastern Amazon basin in the Brazilian Pará state of Pará, in Amazon river near Belém and Santarém, and the Tocantins and Trombetas basins ( Figure 2 View FIGURE 2 B).

Etymology: Subspecific epithet derived from the Latin “ orientalis ” meaning “of the East”.

G. carapo G. carapo G. carapo G. carapo G. carapo G. carapo G. carapo

Character australis caatingaensis carapo madeirensis occidentalis orientalis septentrionalis

MLP 11222 AUM 20624 UMMZ 190414 MUSM 12949 UMMZ 230734 MZUSP 30025 UF 80734 Morphom.

341 225.0 260.0 227.0 210.0 237.0 220.0

45.0 27.1 31.5 25.9 27.8 31.7 26.0 % 13.2 12.0 12.1 11.4 13.2 13.4 11.8 % 34.4 37.6 36.1 37.8 33.1 35.0 34.3 % 41.1 43.9 42.8 39.0 36.0 43.7 35.5 % 56.9 65.7 61.9 60.6 61.2 60.9 63.7 % 37.6 37.6 41.7 39.8 36.0 35.6 38.4 % 88.9 84.5 96.9 90.0 86.3 74.1 93.2 % 67.1 64.2 68.8 64.1 61.2 54.3 70.3 /BD 82.7 76.0 71.0 71.2 70.8 73.2 75.4 % 57.8 58.3 61.8 57.1 57.9 52.1 62.9 % 66.2 61.3 63.0 59.5 61.9 53.3 61.3 % 28.7 33.2 32.0 37.9 34.5 36.5 38.8 % 63.6 83.8 88.0 74.9 82.7 89.0 80.0 % 40.0 46.9 12.7 43.4 40.3 44.2 45.2 % 82.7 75.6 86.0 74.9 81.0 79.3 81.8 Meristics

23 23 21 16 21 23 21

269 220 235 220 170 220 245 R 15 16 16 13 16 13 17

10 6 6 6 7 6 7

3 4 4 4 4 3 4

8 8 8 8 9 8 8

36 45 40 49 46 46 53

88 76 95 92 88 75 112

10 19 24 18 20 21 23

MCZ

Museum of Comparative Zoology