Uma nova espécie de Poptella é descrita da bacia do rio Xingu, estados do Pará e Mato Grosso, Brasil. A nova espécie é distinguida de todas as espécies congêneres por apresentar maior número de escamas ao redor do pedúnculo caudal (15–18 vs. 13–14). Além disso, esta espécie pode ser facilmente distinguida de P. brevispina P. longipinnis e P. fuscata pelo menor número de raios ramificados na nadadeira dorsal (9 vs.10-11). A descrição do novo táxon representa a terceira espécie do gênero Poptella descrita nos últimos cinco anos.

Palavras-chave:
Amazônia; Biodiversidade; Clado Stethaprion; Stethaprioninae; Taxonomia

Autoria

James R. Garcia-Ayala

Conceptualization, Formal analysis, Investigation, Writing-original draft.

Departamento de Biodiversidade e Bioestatística, Laboratório de Ictiologia, Universidade Estadual Paulista, Campus de Botucatu, R. Prof. Dr. Antonio C. W. Zanin, s/n, Rubião Jr., 18618-689 Botucatu, SP, Brazil. (JRGA) jamesrga@hotmail.com (corresponding author); (RCB) ricardo.benine@unesp.br.Universidade Estadual PaulistaBrazilBotucatu, SP, BrazilDepartamento de Biodiversidade e Bioestatística, Laboratório de Ictiologia, Universidade Estadual Paulista, Campus de Botucatu, R. Prof. Dr. Antonio C. W. Zanin, s/n, Rubião Jr., 18618-689 Botucatu, SP, Brazil. (JRGA) jamesrga@hotmail.com (corresponding author); (RCB) ricardo.benine@unesp.br.

https://orcid.org/0000-0002-1028-8971

Ricardo C. Benine

Conceptualization, Formal analysis, Investigation, Writing-review and editing.

https://orcid.org/0000-0002-0892-9768

Edited-by

Priscila Camelier

Correspondence

James R. Garcia-Ayala jamesrga@hotmail.com

Competing Interests

The author declares no competing interests.

Ethical Statement

Not applicable.

SCIMAGO INSTITUTIONS RANKINGS

Figuras | Tabelas

Figuras (5)
Tabelas (2)

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FIGURE 1 |
Poptella fortispina, holotype, INPA 59843, 53.3 mm SL, Brazil, Pará, rio Xingu basin.

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FIGURE 2 |
Predorsal spine and dorsal-fin rays of Poptella fortispina, LBP 16681, paratype, 32.1 mm SL, lateral view, left side. Scale bar = 1 mm.

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FIGURE 3 |
Premaxilla, maxilla, and dentary of Poptella fortispina, LBP 16681, paratype, 33.7 mm SL, lateral view, right side. Scale bar = 1 mm.

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FIGURE 4 |
Predorsal spines of Poptella species: A. P. fortispina, INPA 52827, paratype, 59.9 mm SL; B. P. paraguayensis, LBP 3826, 48.9 mm SL; C. P. compressa, ROM 97574, 48.4 mm SL; D. P. actenolepis, MZUSP 12282, paratype, 54.6 mm SL; lateral view, left side. Scale bars = 1 mm.

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FIGURE 5 |
Map showing the known distribution of Poptella fortispina. Red star indicates the type-locality. Symbols may represent more than one locality.

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TABLE 1 |
Morphometric data of holotype (H) and paratypes of Poptella fortispina. Range includes values of the holotype. N = the total number of specimens examined. SD = Standard deviation.

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TABLE 2 |
Species of Poptella grouped based on the number of branched dorsal-fin rays.

FIGURE 1 | Poptella fortispina, holotype, INPA 59843, 53.3 mm SL, Brazil, Pará, rio Xingu basin.

FIGURE 2 | Predorsal spine and dorsal-fin rays of Poptella fortispina, LBP 16681, paratype, 32.1 mm SL, lateral view, left side. Scale bar = 1 mm.

FIGURE 3 | Premaxilla, maxilla, and dentary of Poptella fortispina, LBP 16681, paratype, 33.7 mm SL, lateral view, right side. Scale bar = 1 mm.

FIGURE 4 | Predorsal spines of Poptella species: A. P. fortispina, INPA 52827, paratype, 59.9 mm SL; B. P. paraguayensis, LBP 3826, 48.9 mm SL; C. P. compressa, ROM 97574, 48.4 mm SL; D. P. actenolepis, MZUSP 12282, paratype, 54.6 mm SL; lateral view, left side. Scale bars = 1 mm.

FIGURE 5 | Map showing the known distribution of Poptella fortispina. Red star indicates the type-locality. Symbols may represent more than one locality.

TABLE 1 | Morphometric data of holotype (H) and paratypes of Poptella fortispina. Range includes values of the holotype. N = the total number of specimens examined. SD = Standard deviation.

	Holotype	Range	N	Mean	SD
Standard length (mm)	55.9	32.0–60.8	62	39.4	–
Percentage of standard length
Snout to dorsal-fin origin	50.8	49.2–53.9	62	51.9	1.0
Snout to adipose-fin origin	84.5	83.3–88.1	62	86.5	1.1
Snout to anal-fin origin	67.2	66.1–70.9	61	68.6	1.5
Snout to pelvic-fin origin	52.9	50.8–56.7	61	53.8	1.6
Snout to pectoral-fin origin	29.1	28.8–33.8	62	31.1	1.1
Dorsal-fin origin to pectoral-fin origin	47.5	45–50.9	61	48.2	1.7
Dorsal-fin origin to pelvic-fin origin	57.6	53.2–62.0	61	57.7	2.5
Dorsal-fin origin to anal-fin origin	58.1	55.4–61.7	57	58.7	1.8
Dorsal-fin origin to anal-fin end	52.5	51.3–57.5	61	54.4	1.4
Dorsal-fin origin to hypural joint	57.2	56.2–61.1	61	59.2	1.3
Dorsal-fin origin to adipose-fin origin	40.4	40.0–44.7	61	42.3	1.2
Length of dorsal-fin base	16.7	15.4–19.4	61	17.6	0.9
Dorsal-fin end to pelvic-fin origin	53.3	49.0–56.7	61	53.2	2.0
Dorsal-fin end to adipose-fin origin	24.5	22.5–26.9	61	25.2	1.0
Dorsal-fin end to anal-fin origin	50.0	48.2–53.8	61	50.9	1.6
Dorsal-fin end to anal-fin end	37.1	34.7–39.7	61	37.3	1.2
Adipose-fin origin to anal-fin origin	49.8	47.0–53.7	61	51	1.6
Adipose-fin origin to anal-fin end	16.4	14.2–19.8	61	16.9	1.2
Adipose-fin origin to hypural joint	16.4	15.7–19.0	61	17.5	0.9
Length of anal-fin base	40.2	39.0–43.7	54	41.3	1.6
Predorsal spine	4.6	4.3–5.5	60	4.8	0.3
Anal-fin origin to hypural joint	10.5	9.1–12.8	62	11.0	0.8
Pectoral-fin length	25.0	24.6–28.3	61	26.1	0.9
Pelvic-fin length	17.8	17.7–19.9	36	18,8	0.6
Dorsal-fin length	31.6	30.0–37.4	52	34.1	1.8
Anal-fin length	18.9	18.4–27.9	37	23.7	2.8
Pelvic-fin origin to anal-fin origin	16.4	15.2–19.8	61	17.7	1.0
Pelvic-fin origin to adipose-fin origin	60.4	58.1–64.8	61	64.9	1.7
Pelvic-fin origin to hypural joint	64.3	63.2–69.9	61	66.6	1.5
Pelvic-fin origin to pectoral-fin insertion	22.9	19.2–25.8	61	22.7	1.6
Greatest body depth	56.5	50.0–60.0	62	55.4	2.8
Greatest body width	11.2	9.4–13,6	62	11.6	1.1
Caudal-peduncle depth	10.7	9.8–12.6	61	11,3	1.0
Head depth	45.0	42.1–49.3	62	45.8	1.7
Distance from eye to dorsal-fin origin	30.2	28.9–34	50	31.5	1.0
Snout to supraoccipital crest	38.9	36.6–42.4	62	39.5	1.3
Head length	26.8	26.3–31.0	62	28.9	1.0
Percentage of head length
Preopercle length	89.5	87.1–93.9	54	90.7	1.8
Snout to anterior margin of eye	23.8	21.6–28.7	54	24.2	1.6
Snout depth	14.5	12.6–17.2	53	15.1	1.3
Upper Jaw length	39.4	36.7–43.5	54	39.9	1.6
Eye diameter	41.1	41.0–47,5	49	43.9	1.7
Interorbital width	34.0	32.5–37.9	54	35.4	1.3

TABLE 2 | Species of Poptella grouped based on the number of branched dorsal-fin rays.

Species of the genus Poptella	Dorsal-fin rays	References
Group 1	iii,9
Group 1	n
Poptella compressa (Günther, 1864)	257	Garcia-Ayala (2018) Garcia-Ayala JR. Revisão taxonômica da subfamília Stethaprioninae (Teleostei: Characiformes, Characidae). [PhD Thesis]. Botucatu: Universidade Estadual Paulista “Júlio de Mesquita Filho”; 2018. Available from: http://hdl.handle.net/11449/153764 http://hdl.handle.net/11449/153764...
Poptella paraguayensis (Eigenmann, 1907)	104	Garcia-Ayala (2018)Garcia-Ayala JR. Revisão taxonômica da subfamília Stethaprioninae (Teleostei: Characiformes, Characidae). [PhD Thesis]. Botucatu: Universidade Estadual Paulista “Júlio de Mesquita Filho”; 2018. Available from: http://hdl.handle.net/11449/153764 http://hdl.handle.net/11449/153764...
Poptella actenolepis Garcia-Ayala & Benine, 2019	107	Garcia-Ayala, Benine (2019)Garcia-Ayala JR, Benine RC. A new species of Poptella (Characiformes: Characidae: Stethaprioninae) from the rio Juma basin, rio Madeira basin, Brazil. Neotrop Ichthyol. 2019; 17(2):e180149. https://doi.org/10.1590/1982-0224-20180149 https://doi.org/10.1590/1982-0224-201801...
Poptella fortispina	125	This study
Group 2	iii,10
Group 2	n
Poptella longipinnis (Popta, 1901)	58	Garcia-Ayala (2018)Garcia-Ayala JR. Revisão taxonômica da subfamília Stethaprioninae (Teleostei: Characiformes, Characidae). [PhD Thesis]. Botucatu: Universidade Estadual Paulista “Júlio de Mesquita Filho”; 2018. Available from: http://hdl.handle.net/11449/153764 http://hdl.handle.net/11449/153764...
Poptella brevispina Reis, 1989	163	Garcia-Ayala (2018)Garcia-Ayala JR. Revisão taxonômica da subfamília Stethaprioninae (Teleostei: Characiformes, Characidae). [PhD Thesis]. Botucatu: Universidade Estadual Paulista “Júlio de Mesquita Filho”; 2018. Available from: http://hdl.handle.net/11449/153764 http://hdl.handle.net/11449/153764...
Group 3	iii,11
Group 3	n
Poptella fuscata Garcia-Ayala & Benine, 2021	13	Garcia-Ayala, Benine (2021) Garcia-Ayala JR, Benine RC. Poptellafuscata, a new Stethaprionini from the upper Amazon basin, Peru (Characiformes: Characidae). J Fish Biol. 2021; 98(5):1281–88. https://doi.org/10.1111/jfb.14658 https://doi.org/10.1111/jfb.14658...

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[1] Edited-by

Priscila Camelier