Gymnotus carapo occidentalis, 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 : 429-430

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.6045083

persistent identifier

https://treatment.plazi.org/id/92168D11-E72C-474B-1CC4-FD3EFB3CFC16

treatment provided by

Plazi

scientific name

Gymnotus carapo occidentalis
status

New Subspecies

Gymnotus carapo occidentalis New Subspecies

Figure 3 View FIGURE 3 E, Tables 3 and 4

Holotype: UF 126181 View Materials , 272 mm, Peru, Loreto, Río Pacaya, Cocha Zapote (05°20’02”S, 074°29’05”W). GoogleMaps

Paratypes: UF 126181 View Materials , 245 mm, Peru, Loreto, Río Pacaya, Cocha Zapote (05°20’02”S, 074°29’05”W). GoogleMaps

Non-Types: ANSP 203173 (20) 105–263 mm, Peru, Loreto, Cocha Santo Tomás aff. Río Nanay near Iquitos. INHS 55038 (1) 323 mm, Peru, Loreto, Río Napo aff. Amazon. INPA 6390 (1) 450 mm, Brazil, Mato Grosso, Aripuanã, Río Aripuanã, Igarapé Castanhal. MUSM 11590 (5), 193–211 mm, Cuenca Ebehuabaeji, Sandia. MUSM 58770 (20) 86–275 mm, Peru, Loreto, Cocha Santo Tomás aff. Río Nanay near Iquitos (03°47’59.92”S, 073°20’14.48”W). MZUSP 76061 (1), 260 mm, Brazil, Amazonas, Río Tefé, Lago Tefé, Cabeçeira do Lago Tefé (03°34’35”S, 064°59’19”W). MZUSP 76063 (1), 298 mm, Brazil, Amazonas, MSDR, Ressaca da Vila Alencar (03°07’42”S, 064°48’02”W). MZUSP 76064 (1), 253 mm, Brazil, Amazonas, MSDR, Cano do Lago Mamirauá (03°04’26”S, 064°48’39”W). NRM 27650 View Materials (1), 305 mm, Peru, Loreto, Río Samiria, Maynas, right bank stream tributary between Caño Pastos and Hamburgo (05°2’S, 075°08’W). NRM 27650 View Materials (1), 305 mm, Peru, Loreto, Río Samiria, Maynas, right bank stream tributary between Caño Pastos and Hamburgo (05°12’S, 075°08’W). NRM 40772 View Materials (1), 91 mm, Peru, Loreto, Río Maniti, Maynas, 50 km NE of Iquitos (03°29’S, 072°44’W). NRM 40772 View Materials (1), 91 mm, Peru, Loreto, Río Maniti, Maynas, 50 km NE of Iquitos (03°29’S, 072°44’W). UF 116573 View Materials (2), 189–279 mm, Peru, Loreto, Río Amazonas, Maynas, Río Nanay. UF 116665 View Materials (1), 298 mm, Peru, Loreto, Río Nanay, Maynas, 3 km upstream Mishana, Reserva Allpahuayo-Mishana (03°52’05”S, 073°29’03”W). UF 116665 View Materials (1), 298 mm, Peru, Loreto, Río Nanay, Maynas, 3 km upstream Mishana, Reserva Allpahuayo-Mishana (03°52’05”S, 073°29’03”W). UF 122820 View Materials (1), 275 mm, Peru, Loreto, Río Amazonas, Maynas, Río Nanay. UF 122821 View Materials (1), 331 mm, Peru, Loreto, acquired from fishermen 28 May, 2002, Río Amazonas near Iquitos, Loreto Department, Peru (03°46’S, 073°15’W). UF 122822 View Materials (1), 330 mm, Peru, Loreto, Río Amazonas, Maynas, Río Nanay. UF 122822 View Materials (1), 334 mm, Peru, Loreto, acquired from fishermen 28 May, 2002, Río Amazonas near Iquitos, Loreto Department, Peru (03°46’S, 073°15’W). UF 122825 View Materials (1), 158 mm, Peru, Loreto, Río Amazonas, Maynas, Río Nanay. UF 122825 View Materials (1), 158 mm, Peru, Loreto, Río Amazonas, Maynas, Río Nanay. UF 122847 View Materials (1), 188 mm, Peru, Loreto, Río Amazonas, Maynas, Río Nanay. UF 122847 View Materials (1), 188 mm, Peru, Loreto, Río Amazonas, Maynas, Río Nanay. UF 122848 View Materials (1), 112 mm, Peru, Loreto, Río Amazonas, Maynas, Río Nanay. UF 122849 View Materials (1), 132 mm, Peru, Loreto, Río Amazonas, Maynas, Río Nanay. UF 122849 View Materials (1), 132 mm, Peru, Loreto, Río Amazonas, Maynas, Río Nanay. UF 122852 View Materials (1), 92 mm, Peru, Loreto, Río Amazonas, Maynas, Río Nanay. UF 128991 View Materials (1) 291–307 mm, Peru, Loreto, Ucayali, (05°18’7.3”N, 074°03’36.03”W). UF 131129 View Materials (1) 172 mm, Peru, Loreto, Río Amazonas, Maynas, Río Nanay (03°45”S, 073°15’W). UF 131129 View Materials (1), 172 mm, Peru, Loreto, Río Amazonas, Maynas, Río Nanay, near Iquitos. UFRGS 22695 (23) 104–266 mm, Peru, Loreto, Cocha Santo Tomás aff. Río Nanay near Iquitos. UMMZ 228999 (1), 162 mm, Peru, Loreto, Río Tahuayo (04°10’S, 073°12’W). UMMZ 230733 (1), 251 mm, Peru, Loreto, Río Yavari, Buen Suceso, Quebrada Carana (04°08’S, 070°26’W). UMMZ 230733 (1), 251 mm, Peru, Loreto, Río Yavari, Buen Suceso, Quebrada Carana (approx. 04°08’S, 070°26’W). UMMZ 230734 (2), 190–210 mm, Brazil, Santa Cruz, Benjamin Constante, Río Nanay Río Nanay, Río Cayari (04°22’S, 070°02’W). ROM 83885 View Materials (1) 233 mm, Guyana, Essequibo, Cuyuni-Mazaruni. ROM 83886 View Materials (1) 238 mm, Guyana, Essequibo, Cuyuni-Mazaruni. ROM 83887 View Materials (1) 210 mm, Guyana, Essequibo, Cuyuni-Mazaruni. ROM 89520 View Materials (1) 189 mm, Guyana, Essequibo, Cuyuni-Mazaruni. ROM 89583 View Materials (1) 278 mm, Guyana, Essequibo, Cuyuni-Mazaruni. ROM 89660 View Materials (1) 176 mm, Guyana, Essequibo, Cuyuni-Mazaruni. ROM 89661 View Materials (1) 158 mm, Guyana, Essequibo, Cuyuni-Mazaruni. ROM 89662 View Materials (1) 132 mm, Guyana, Essequibo, Cuyuni-Mazaruni. ROM 93388 View Materials (1) 246 mm, Guyana, Essequibo, Cuyuni- Mazaruni. ROM 93389 View Materials (1) 238 mm, Guyana, Essequibo, Cuyuni-Mazaruni. ROM 93407 View Materials (1) 248 mm, Guyana, Essequibo, Cuyuni-Mazaruni. ROM 93424 View Materials (1) 245 mm, Guyana, Essequibo, Cuyuni-Mazaruni. ROM 93425 View Materials (1) 205 mm, Guyana, Essequibo, Cuyuni-Mazaruni. ROM 93426 View Materials (1) 186 mm, Guyana, Essequibo, Cuyuni-Mazaruni.

Description: Specimens of G. carapo from the western 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 occidentalis 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): long head (HL 11.4%–15.5% TL, mean 13.1% TL vs 10.2%–14.0%, mean 12.4% in all other subspecies), short preorbital distance (PR 28.0%–39.1% HL, mean 34.2% vs. 31.0%–40.2%, mean 35.3% in all other subspecies), narrow mouth (MW 32.2%–45.2% HL, mean 38.3% vs. 32.9%–49.0%, mean 42.2% in all other subspecies), short interorbital distance (IO 31.9%–40.6% HL, mean 35.6% vs. 32.9%–44.8%, mean 38.1% in all other subspecies), slender body (BD 63.7%–95.2% HL, mean 80.9% vs. 42.7%–106.6%, mean 86.4% in all other subspecies), slender head (HD 44.0%–62.5% HL, mean 56.2% vs. 50.8%–72.4%, mean 59.5% in all other subspecies) and narrow head (HW 50.0%–63.4% HL, mean 58.4% vs. 49.1%–67.7%, mean 60.2% in all other subspecies).

Distribution: Known from the western Amazon basin including Department of Loreto, Peru, the Río Aripuanã in the state of Mato Grosso, Brazil and the Amazon at Tefé in Brazil. Also known from the Cuyuni-Mazaruni in Essequibo basin of Guyana and the Napo basin in Ecuador ( Figure 2 View FIGURE 2 B).

Etymology: Subspecific epithet derived from the Latin “ occidentalis ” meaning “of the West”.

ANSP

Academy of Natural Sciences of Philadelphia

INHS

Illinois Natural History Survey

INPA

Instituto Nacional de Pesquisas da Amazonia

MZUSP

Museu de Zoologia da Universidade de Sao Paulo

NRM

Swedish Museum of Natural History - Zoological Collections

UFRGS

Universidade Federale do Rio Grande do Sul

UMMZ

University of Michigan, Museum of Zoology

ROM

Royal Ontario Museum