Description of a new species of Pareiorhaphis (Loricariidae: Neoplecostominae) from the rio Jequitinhonha basin, Minas Gerais, eastern Brazil

Pereira, Edson H. L.; Pessali, Tiago C.; Andrade, Francisco de; Reis, Roberto E.

doi:10.1590/1982-0224-20170007

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ARTICLES • Neotrop. ichthyol. 15 (3) • 2017 • https://doi.org/10.1590/1982-0224-20170007 copy

Description of a new species of Pareiorhaphis (Loricariidae: Neoplecostominae) from the rio Jequitinhonha basin, Minas Gerais, eastern Brazil

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

A new species of the loricariid genus Pareiorhaphis is described based on specimens from several tributaries of the upper and middle rio Jequitinhonha basin, Minas Gerais State, eastern Brazil. The new species increases the number of known species of Pareiorhaphis to 25 and, at the same time, represents the second member of the subfamily Neoplecostominae reported from the rio Jequitinhonha basin. The new species is diagnosed from all remaining congeners by a putative autapomorphic feature related to the color pattern: a well-defined, dark brown stripe on the median series of lateral plates that extends along the flank from the posterior margin of compound pterotic to the caudal-fin base. The shallow caudal peduncle and the comparatively larger number of dentary teeth also distinguish the new species from most congeners. The new species is also compared to Pareiorhaphis stephanus, a syntopic congener with similar traits.

Keywords:
Cascudos; Coastal drainages; Endemism; Itacambiruçu River; Taxonomy

	H	n	Low	High	Mean	SD
Standard length (mm)	95.1	31	58.3	115.7	81.0	-
Percent of standard length
Head length	33.5	31	31.3	35.7	34.1	0.94
Predorsal length	42.8	31	40.4	44.0	42.4	0.98
Postdorsal length	38.8	31	36.1	41.5	38.9	1.32
Preanal length	66.6	31	63.5	68.9	65.4	1.16
Preadipose length	82.2	31	78.5	82.8	80.1	1.12
Dorsal-fin spine length	19.4	31	18.1	23.0	19.9	1.12
Anal-fin unbranched ray length	9.5	31	9.4	12.9	11.0	0.83
Pectoral-fin spine length	19.3	31	17.4	23.9	20.5	1.42
Pelvic-fin unbranched ray length	19.8	31	18.2	22.2	19.9	1.06
Upper caudal-fin ray	20.1	29	19.5	23.5	21.7	1.14
Lower caudal-fin ray	26.0	29	24.1	31.8	27.6	1.83
Adipose-fin spine length	9.7	30	9.4	11.6	10.3	0.63
Adipose to caudal fin distance	20.0	31	18.3	22.6	20.7	1.04
Trunk length	19.9	31	17.1	20.9	19.4	0.86
Abdominal length	22.6	31	20.1	22.8	21.6	0.70
Cleithral width	31.5	31	28.5	31.5	30.0	0.88
Body depth at dorsal-fin origin	18.4	31	13.3	19.9	16.9	1.44
Body width at dorsal-fin origin	22.6	30	20.9	25.5	22.5	1.02
Body width at anal-fin origin	15.2	31	12.3	15.6	14.0	0.78
Caudal peduncle length	36.7	31	33.8	38.8	35.6	1.10
Caudal peduncle depth	8.9	31	7.9	9.0	8.5	0.29
Caudal peduncle width	5.2	31	4.2	5.5	4.8	0.32
Percent of head length
Snout length	66.4	31	60.8	66.5	63.8	1.27
Orbital diameter	13.3	31	12.7	16.2	14.2	0.76
Interorbital width	30.2	31	27.2	31.6	29.4	1.28
Head depth	51.7	31	41.3	55.6	47.7	3.16
Mandibular ramus	26.8	31	23.6	27.8	25.8	1.10
Meristics					Mode
Premaxillary teeth left/right	101/102	28	65/66	101/103	80	8.31
Dentary teeth left/right	105/103	28	69/66	105/103	83	9.07
Plates in median lateral series left/right	26/25	31	24/24	26/27	25	0.62
Plates at dorsal-fin base	7	31	6	7	7	0.43
Plates between dorsal and adipose	7	31	6	7	6	0.49
Plates between adipose and caudal	3	31	2	4	3	0.26
Plates at anal-fin base	3	31	2	4	3	0.43
Plates between anal and caudal	12	30	11	12	11	0.48
Pre-adipose azygous plates	3	31	1	4	2	0.75

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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