Chuctaya, Junior; Bührnheim, Cristina M.; Malabarba, Luiz R.

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Sumário

Original article • Neotrop. ichthyol. 16 (1) • 2018 • https://doi.org/10.1590/1982-0224-20170047 copiar

Two new species of Odontostilbe historically hidden under O. microcephala (Characiformes: Cheirodontinae)

Autoria SCIMAGO INSTITUTIONS RANKINGS

RESUMO

Espécimes historicamente identificados com Odontostilbe microcephala do rio Paraná e tributários do río Paraguay, foram revisados e separados em três espécies. A distribuição de O. microcephala é restrita ao sopé andino da bacia do río Paraguay. A espécie é distinta das congêneres com boca subterminal pela forma alongada, geralmente 10-12 rastros branquiais no ramo superior e menor diâmetro horizontal da órbita (24,6-32,8 % CC, média 28,7%). Espécimes do alto rio Paraná constituem duas espécies novas diagnosticadas de outros Cheirodontinae pela presença de dentes no mesopterigoide, agrupados em sua porção média e formando uma fileira continua. As novas espécies distinguem-se por ter dentes premaxilares com cinco cúspides vs. nove cúspides e pelo número de lamelas nos lados esquerdo e direito da rafe central da roseta olfativa com 20-21 vs. 11-12.

Palavras-chave:
Bacia do rio da Prata; Biodiversidade; Characidae; Dentes do Mesopterigoide; Taxonomia

	Holotype	Females					Males					Unsexed
	Holotype	N	Min	Max	Mean	SD	N	Min	Max	Mean	SD	N	Min	Max	Mean	SD
Standard length (mm)	42.5	37	29.9	50.8	39.3	-	17	29.8	43.9	38.0	-	9	21.4	25.2	23.5	-
Percents of Standard Length
Snout to anal-fin origin	62.3	36	61.6	67.3	63.5	1.2	15	60.6	63.9	62.4	0.9	7	63.3	66.6	64.4	1.2
Snout to dorsal-fin origin	46.1	36	45.3	51.7	47.9	1.1	15	45.4	49.9	47.2	1.5	7	47.9	52.1	49.9	1.5
Snout to pelvic-fin origin	43.9	36	43.3	49.3	45.4	1.2	15	43.3	45.5	44.6	0.6	7	45.5	49.5	47.3	1.4
Snout to pectoral-fin origin	21.9	36	20.7	25.8	23.1	1.1	15	21.9	26.6	23.1	1.2	7	24.1	26.4	25.5	0.8
Dorsal to caudal-fin origin	51.9	36	47.7	54.2	50.9	1.7	15	47.3	53.8	51.6	1.8	7	48.1	51.8	49.9	1.1
Orbit to dorsal-fin origin	32.1	36	31.3	36.1	33.0	1.2	15	30.0	34.7	32.2	1.4	7	29.6	34.9	32.9	1.8
Anal fin base length	23.2	36	20.9	27.9	23.8	1.2	15	21.9	27.4	23.9	1.3	7	22.4	26.0	23.8	1.2
Length of caudal peduncle	13.9	36	10.8	14.5	12.5	1.0	15	11.3	14.1	12.9	0.8	7	12.5	14.6	13.6	0.9
Depth of caudal peduncle	10.5	36	9.3	11.1	10.3	0.4	15	9.5	11.0	10.2	0.5	7	9.6	11.7	10.4	0.7
Body depth at dorsal fin	28.8	36	23.1	32.9	27.9	2.0	15	23.6	30.9	26.3	1.9	7	27.3	31.0	28.2	1.3
Dorsal fin length	27.2	36	23.5	27.2	25.4	1.1	15	23.5	29.9	26.6	2.2	7	23.5	25.7	25.0	0.9
Pelvic fin length	17.1	36	14.0	18.5	16.1	1.0	15	15.0	21.9	17.5	2.0	7	13.7	17.2	15.3	1.3
Pectoral fin length	22.3	36	18.6	21.8	20.1	0.7	15	19.6	22.6	21.0	0.9	7	16.4	20.8	18.0	2.1
Head length	23.2	36	23.1	25.3	24.0	0.6	15	23.2	26.4	24.6	0.8	7	25.8	27.4	26.7	0.6
Percents of Head Length
Snout length	23.8	36	21.1	29.2	24.2	1.7	15	20.9	27.5	24.7	1.7	7	22.8	28.2	25.0	2.2
Upper Jaw length	35.3	36	30.7	37.9	34.0	1.5	15	31.0	36.9	34.0	1.7	7	31.5	35.0	33.3	1.4
Horizontal orbit diameter	36.9	36	34.0	40.5	36.9	1.7	15	35.0	40.9	37.2	1.7	7	34.9	40.7	37.5	1.9
Interorbital width	32.6	36	29.0	35.1	32.5	1.5	15	29.4	34.1	31.4	1.3	7	29.1	34.6	31.1	1.7

	Holotype	N	Min	Max	Mean	SD
Standard length (mm)	48.7	14	30.2	70.7	53.0	-
Percents of Standard Length
Snout to anal-fin origin	67.1	14	66.9	71.6	68.3	1.4
Snout to dorsal-fin origin	47.2	14	46.2	50.7	48.3	1.4
Snout to pelvic-fin origin	47.2	14	46.5	50.8	48.3	1.3
Snout to pectoral-fin origin	21.1	14	18.7	24.2	21.6	1.8
Dorsal to caudal-fin origin	49.2	14	48.9	53.5	51.3	1.6
Orbit to dorsal-fin origin	32.4	14	31.8	38.0	34.9	1.7
Anal-fin base length	18.2	14	17.4	22.4	20.0	1.5
Length of caudal peduncle	12.4	14	10.3	13.2	12.1	0.9
Depth of caudal peduncle	15.9	14	9.7	15.9	11.1	1.5
Body depth at dorsal-fin	25.4	14	25.4	32.9	29.2	2.3
Dorsal-fin length	24.2	14	21.6	26.5	24.2	1.3
Pelvic-fin length	16.5	14	14.4	17.7	16.1	0.9
Pectoral-fin length	19.5	14	17.9	20.9	19.1	1.0
Head length	22.2	14	21.3	24.0	22.5	0.8
Percents of Head Length
Snout length	25.5	14	23.3	28.4	25.5	1.4
Upper Jaw length	31.0	14	30.8	36.3	32.8	1.7
Horizontal orbit diameter	38.3	14	31.0	39.7	35.5	2.4
Interorbital width	34.9	14	30.9	36.1	33.6	1.9

	Holotype CAS59790	Paratype CAS59791	Females					Males
	Holotype CAS59790	Paratype CAS59791	N	Min	Max	Mean	SD	N	Min	Max	Mean	SD
Standard length (mm)	32.7	33.7	39	29.7	52.0	38.8	-	22	30.4	43.6	36.4	-
Percents of Standard Length
Snout to anal-fin origin		67.1	36	61.6	69.1	64.2	1.4	18	61.7	64.7	63.4	1.0
Snout to dorsal-fin origin		48.1	36	45.5	50.8	48.3	1.1	18	45.7	50.1	48.0	1.0
Snout to pelvic-fin origin		446.0	36	42.7	48.8	45.7	1.2	18	44.0	49.2	45.9	1.4
Snout to pectoral-fin origin		21.1	36	20.1	23.0	21.7	0.7	18	20.7	23.8	22.3	0.9
Dorsal to caudal-fin origin		50.5	36	48.0	56.8	52.1	1.9	18	48.7	55.0	52.2	1.7
Orbit to dorsal-fin origin		39.5	36	33.7	39.6	37.1	1.4	18	32.8	38.6	36.2	1.4
Anal fin base length		23.2	31	20.1	24.4	21.9	1.0	18	20.2	25.2	22.6	1.2
Peduncle length		14.9	32	11.5	16.9	14.4	1.2	18	11.2	16.2	14.0	1.4
Peduncle depth		10.4	32	9.8	12.5	10.8	0.7	18	8.6	11.7	10.5	0.9
Body depth at dorsal fin			34	24.3	34.0	28.2	2.4	18	24.7	30.7	27.5	2.0
Dorsal fin length			27	22.8	28.1	24.6	1.2	17	23.8	32.9	27.2	3.1
Pelvic fin length			29	13.9	17.4	16.0	0.9	18	16.3	21.4	18.3	1.7
Pectoral fin length			29	17.3	25.9	20.2	1.6	18	17.8	23.2	20.9	1.4
Head length		23.4	36	20.5	23.9	22.4	0.8	18	21.2	23.6	22.7	0.6
Percents of Head Length
Snout length		22.8	36	18.8	24.8	22.6	1.4	18	20.1	25.1	23.2	1.4
Upper Jaw length		30.4	33	29.0	35.7	31.5	1.9	18	29.6	35.8	32.1	2.0
Horizontal orbit diameter		25.3	36	25.3	32.8	28.6	1.9	18	24.6	31.8	28.8	2.0
Interorbital width		30.4	36	28.4	35.6	32.4	2.0	18	29.4	35.5	32.0	1.7

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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