Bifi, Alessandro Gasparetto; Ortega, Hernán

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Sumário

Original article • Neotrop. ichthyol. 18 (1) • 2020 • https://doi.org/10.1590/1982-0224-2019-0070 copiar

Redescription of Ancistrus greeni (Siluriformes: Loricariidae), and description of a new species from the río Madre de Dios basin, Peru

Autoria SCIMAGO INSTITUTIONS RANKINGS

RESUMO

Uma nova espécie de Ancistrus é descrita de pequenos tributários da bacia do rio Madre de Dios (Cusco - Madre de Dios - Puno), no Peru. A nova espécie compartilha com A. greeni uma dentição unicuspidada pouco comum e é diagnosticada de A. greeni pelo maior diâmetro orbital, maior altura do pedúnculo caudal e maior espinho da nadadeira adiposa. A redescrição de A. greeni é fornecida, e seu reconhecimento juntamente com a descoberta dessa nova espécie incrementam para cinco o número oficial de Ancistrus registradas para a bacia do rio Madre de Dios. O lectótipo e paralectótipo de A. greeni são fornecidos.

Palavras-chave:
Ancistrini; Bacia amazônica; Bacia do rio Inambari; Cascudo; Taxonomia

Characters	Lectotype	Paralectotype	N	Range	Mean	SD
Standard length (mm)	51.4	44.8	25	44.8-85.2	62.0
Percents of standard length
Predorsal length	44.5	44.9	25	44.5-49.3	46.8	1.4
Head length	34.4	36.0	25	34.3-39.6	36.8	1.7
Occipital depth	15.4	14.6	25	14.6-17.7	16.4	0.8
Cleithral width	32.6	33.5	25	30.9-35.9	33.5	1.3
Dorsal-fin base length	17.8	18.7	25	17.8-22.4	20.4	1.2
Interdorsal length	20.6	19.1	24	17.6-22.9	20.2	1.3
Prepectoral length	27.2	28.3	25	27.2-32.5	30.1	1.5
Prepelvic length	52.0	54.4	25	49.9-54.4	52.2	1.3
Dorsal-fin spine length	23.0	-	24	19.3-25.4	22.5	1.5
Pectoral-fin spine length	23.4	23.5	25	21.5-26.6	23.9	1.3
First pelvic-fin ray length	25.9	28.5	25	22.8-28.5	25.6	1.4
Adipose-fin spine length	5.6	-	22	3.7-6.3	5.1	0.7
First anal-fin ray length	5.7	8.4	25	5.5-8.7	7.1	0.9
Thoracic length	26.0	29.2	25	23.7-29.2	25.8	1.4
Abdominal length	18.9	18.4	25	16.6-21.3	18.5	1.2
Upper caudal-fin ray length	25.5	-	20	20.7-26.7	23.8	1.6
Lower caudal-fin ray length	31.2	-	22	27.8-33.7	30.2	1.7
Caudal peduncle length	-	-	23	26.8-33.2	29.1	1.3
Caudal peduncle depth	8.7	9.0	25	8.4-10.6	9.5	0.6
Adipose-fin to caudal-fin length	14.6	14.9	24	10.2-14.9	11.9	1.3
Anal-fin to caudal-fin length	32.2	31.8	25	30.8-36.8	33.0	1.5
Percents of head length
Supracleithral width	80.6	78.9	25	73.2-82.1	78.0	2.5
Snout length	63.4	60.7	25	55.1-63.4	58.1	3.0
Interorbital distance	36.4	34.9	25	32.3-40.3	36.0	1.9
Orbital diameter	11.2	11.7	25	8.8-13.0	11.0	0.9
Occipital-orbital distance	38.4	37.9	25	37.9-48.6	41.3	2.6
Dentary width	28.5	31.4	25	21.8-31.4	26.4	2.1
Counts
Lateral median series	24	24	25	24-25	24.5	0.5
Dorsal-fin base	6	6	25	6-7	6.8	0.4
Between dorsal and adipose	7	8	25	7-9	7.6	0.6
Between adipose and caudal	6	6	25	4-6	5.2	0.6
Between anal and caudal	13	13	25	12-14	12.8	0.7
Preadipose plates	4	4	25	4-8	6.2	1.2
Premaxillary teeth	-	-	23	51-96	67.4	11.2
Dentary teeth	86	-	23	55-109	78.9	15.1
Cheek spines	11	8	21	8-19	13.2	2.4

Characters	Holotype	N	Range	Mean	SD
Standard length (mm)	114.7	21	61.6-147.2	80.9	-
Percents of standard length
Predorsal length	45.7	21	42.9-46.3	44.5	1.0
Head length	35.1	21	32.2-36.2	34.5	1.1
Occipital depth	19.1	21	16.4-19.1	17.6	0.7
Cleithral width	33.8	21	30.4-36.0	32.7	1.3
Dorsal-fin base length	20.3	21	18.4-21.3	19.8	0.9
Interdorsal length	19.9	21	17.9-23.8	20.4	1.6
Prepectoral length	29.2	21	25.8-30.0	28.3	1.1
Prepelvic length	51.5	21	48.9-53.5	50.4	1.1
Dorsal-fin spine length	25.3	21	24.1-27.6	26.0	1.0
Pectoral-fin spine length	29.2	21	25.2-30.5	26.6	1.4
First pelvic-fin ray length	25.9	21	22.6-27.6	25.4	1.2
Adipose-fin spine length	7.2	21	7.2-9.5	8.4	0.7
First anal-fin ray length	9.2	19	7.1-10.8	8.7	0.9
Thoracic length	25.0	21	24.4-27.6	25.9	0.9
Abdominal length	17.9	21	17.5-20.1	18.6	0.7
Upper caudal-fin ray length	26.1	13	24.1-30.3	27.9	1.8
Lower caudal-fin ray length	27.0	14	26.3-35.4	31.2	2.7
Caudal peduncle length	29.3	21	28.7-32.2	30.1	0.9
Caudal peduncle depth	13.1	21	12.2-14.0	12.7	0.4
Adipose-fin to caudal-fin length	13.5	21	13.4-17.7	15.3	1.3
Anal-fin to caudal-fin length	33.8	21	32.0-37.0	35.2	1.2
Percents of head length
Supracleithral width	86.3	21	78.0-92.7	85.1	3.3
Snout length	56.2	21	54.5-60.7	57.2	1.7
Interorbital distance	41.7	21	37.3-41.7	39.3	1.1
Orbital diameter	14.8	21	13.8-20.6	17.8	1.7
Occipital-orbital distance	41.7	21	39.4-43.2	41.4	1.2
Dentary width	26.7	21	25.9-31.4	27.9	1.4
Counts
Lateral median series	24	21	24-25	24.0	0.2
Dorsal-fin base	6	21	6-7	6.1	0.3
Between dorsal and adipose	8	21	6-8	7.2	0.5
Between adipose and caudal	6	21	5-7	5.8	0.5
Between anal and caudal	13	21	12-13	12.6	0.5
Preadipose plates	2	21	2-4	3.2	0.6
Premaxillary teeth	84	20	71-105	83.8	9.1
Dentary teeth	110	20	75-115	94.3	10.7
Cheek spines	26	21	14-26	19.0	3.3

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

Marcelo Britto