A new species of <i><i>Poptella</i></i> (Characiformes: Characidae: Stethaprioninae) from the Rio Juma, Rio Madeira basin, Brazil

Garcia-Ayala, James R.; Benine, Ricardo C.

doi:10.1590/1982-0224-20180149

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Original article • Neotrop. ichthyol. 17 (2) • 2019 • https://doi.org/10.1590/1982-0224-20180149 copy

A new species of Poptella (Characiformes: Characidae: Stethaprioninae) from the Rio Juma, Rio Madeira basin, Brazil

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

A new species of Poptella is described from the Rio Juma, a tributary of the lower Rio Aripuanã, Rio Madeira basin, Amazonas, Brazil. The new species is distinguished from all congeners, except P. brevispina, by having a lower number of scale rows between the lateral line and dorsal-fin origin (7 vs. 8-10). The new species can be readily distinguished from P. brevispina by the lower number of branched dorsal-fin rays (9 vs. 10). This is the first description of a new species of Poptella since the revisionary study of the Stethaprioninae, published 30 years ago.

Keywords:
Amazon; Biodiversity; Freshwater fish; Stethaprionini; Taxonomy

	Holotype	N	Range	Mean	SD
Standard length (mm)	71.9	43	18.3-72.4	45.4	-
Percentage of standard length
Snout to dorsal-fin origin	51.4	43	50.1-57.7	53.5	0.8
Snout to adipose-fin origin	86.3	43	81.2-91.1	86.6	0.8
Snout to anal-fin origin	67.1	43	64.9-74.9	69.3	1.1
Snout to pelvic-fin origin	55.2	43	50.9-57.3	54.2	1.7
Snout to pectoral-fin origin	30.2	43	29.7-34.6	31.9	0.7
Dorsal-fin origin to pectoral-fin origin	47.9	43	34.7-51.8	44.5	1
Dorsal-fin origin to pelvic-fin origin	57.9	43	36.9-61.1	49.6	1.6
Dorsal-fin origin to anal-fin origin	57.6	43	39.1-63.3	51.1	1.2
Dorsal-fin origin to anal-fin end	54.4	43	45.8-57.4	51.8	1
Dorsal-fin origin to hypural joint	58.3	43	51.7-59.7	55.7	0.9
Dorsal-fin origin to adipose-fin origin	40.3	43	32.9-44	38.7	0.7
Length of dorsal-fin base	17.2	43	12.2-19.1	15.9	0.7
Dorsal-fin end to pelvic-fin origin	53.4	43	34.7-56.4	45.7	1
Dorsal-fin end to adipose-fin origin	22.5	43	19.4-25.9	22.7	0.7
Dorsal-fin end to anal-fin origin	49.1	43	35.4-54.1	44.4	1
Dorsal-fin end to anal-fin end	33.2	43	27.1-39.4	34.15	0.6
Adipose-fin origin to anal-fin origin	50	43	34.8-52.5	44.4	1.1
Adipose-fin origin to anal-fin end	17.1	43	11.5-18.1	14.8	0.5
Adipose-fin origin to hypural joint	18.1	43	13.8-18.7	16.1	1.1
Length of anal-fin base	42.1	43	29.1-43.6	36.8	1.1
Predorsal spine	3.9	43	2.8-4.3	3.6	0.2
Anal-fin origin to hypural joint	8.6	43	8.2-13.8	10.2	0.9
Pectoral-fin length	23.5	43	18.4-28.3	23.3	1.2
Pelvic-fin length	17.6	43	12.3-20.2	16.1	1.1
Dorsal-fin length	31.7	43	28.2-40.7	34.3	0.9
Anal-fin length	22.4	43	14.2-26.6	22.8	1.7
Distance from eye to dorsal-fin origin	41.1	43	32.1-41.1	36.7	0.6
Pelvic-fin origin to anal-fin origin	16.1	43	10.8-22.6	15.8	0.8
Pelvic-fin origin to adipose-fin origin	59.7	43	43.1-65.3	53.5	1.2
Pelvic-fin origin to hypural joint	64.5	43	51-68.4	60.1	0.9
Pelvic-fin origin to pectoral-fin insertion	23.8	43	15.3-24.5	20.5	1.1
Greatest body depth	56	43	38.6-59.9	48.9	1.2
Greatest body width	12.6	43	4.3-13.7	8.7	0.5
Caudal-peduncle depth	9.5	43	7.7-11.7	9.6	0.8
Head depth	49.4	43	31.8-49.7	41.9	1
Snout to supraoccipital crest	31.3	43	30.7-36.3	33.4	1
Head length	27.8	43	23.1-32	28.3	0.8
Percentage of head length
Preopercle length	78.3	43	66.3-89.4	77.2	1.7
Snout to anterior margin of eye	22.6	43	19.7-28.9	24.8	0.9
Snout depth	11.7	43	11.1-22.2	15.3	1.4
Jaw length	45.2	43	41.4-54.6	47.1	1.1
Eye diameter	47.5	43	47.5-57.6	52.1	1.3
Interorbital width	36.8	43	32-46.8	38.6	1

Sociedade Brasileira de Ictiologia Neotropical Ichthyology, Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura, Universidade Estadual de Maringá., Av. Colombo, 5790, 87020-900, Phone number: +55 44-3011-4632 - Maringá - PR - Brazil
E-mail: neoichth@nupelia.uem.br

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[1] Edited by

George Mattox