A new species of <i>Bryconops</i> (Characiformes: Iguanodectidae) from Atlantic coastal drainages of Suriname and French Guiana

Silva-Oliveira, Cárlison; Ota, Rafaela P.; Sabaj, Mark H.; Py-Daniel, Lúcia H. Rapp

doi:10.1590/1982-0224-2021-0113

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Original article • Neotrop. ichthyol. 19 (4) • 2021 • https://doi.org/10.1590/1982-0224-2021-0113 copy

A new species of Bryconops (Characiformes: Iguanodectidae) from Atlantic coastal drainages of Suriname and French Guiana

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

A new species of Bryconops is described based on its unique caudal-fin color pattern, with a dark blotch occupying the mid-basal region of the caudal-fin dorsal lobe, and a combination of 29-32 branched anal-fin rays, 44-47 perforated scales in the lateral line, six rows of scales above the lateral line, and a deep body (30.3-31.7 % SL). The new species belongs to the subgenus Bryconops based on its edentulous and short maxilla, with the posterior extension of that bone not reaching the junction between the second and third infraorbitals. The new species was previously reported in the literature as B. caudomaculatus. However, these species differ from each other in morphometric and meristic characters, as well as in color pattern. Comments on distribution of Bryconops species in coastal drainages of Suriname and French Guiana additional support for biogeographic hypotheses in this area.

Keywords:
Bryconops caudomaculatus; Bryconops melanurus; Caudal-fin blotch; Maroni River; Taxonomy

	H	Range	Mean	SD
Standard length (mm)	94.5	79.5-94.5	85.2	-
Percents of standard length
Snout to dorsal-fin origin	48.1	45.7-48.1	46.8	0.8
Snout to anal-fin origin	64.7	61.4-65.1	63.1	1.4
Snout to pelvic-fin origin	49.8	46.0-49.8	47.8	1.3
Pelvic-fin length	12.2	12.2-16.1	14.8	1.3
Snout to pectoral-fin origin	25.7	24.0-26.0	24.9	0.7
Pectoral-fin length	20.5	19.4-21.7	20.5	0.7
Dorsal-fin base length	15.0	13.4-15.0	14.2	0.6
Depth at dorsal-fin origin	31.7	30.3-31.7	31.1	0.4
Dorsal-fin terminus- adipose origin	27.3	26.2-28.6	27.5	0.8
Dorsal-fin origin- adipose origin	41.3	40.3-42.5	41.3	0.8
Adipose terminus to hypural plate	13.1	12.6-14.3	13.6	0.6
Anal-fin base length	34.0	32.3-34.5	33.3	0.8
Caudal-peduncle length	9.6	9.6-12.8	11.1	1.1
Caudal-peduncle depth	9.2	8.7-9.3	9.1	0.2
Head length	24.3	22.3-24.3	23.5	0.7
Maxillary length	12.1	11.3-12.2	11.5	0.3
Snout length	6.6	5.7-6.6	6.0	0.3
Horizontal orbit diameter	10.6	9.7-10.8	10.4	0.3
Percents of head length
Maxillary length	50.0	47.2-50.5	48.9	1.2
Snout length	26.9	23.8-28.0	25.7	1.7
Horizontal orbit diameter	43.4	43.4-45.0	44.3	0.7
Tip of snout to tip of supraoccipital	94.7	94.0-96.9	94.9	1.0
Posterior margin of orbit to end of opercle	32.6	30.2-32.6	31.5	0.9

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E-mail: neoichth@nupelia.uem.br

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[1] Edited by

Brian Sidlauskas