New species of miniature fish from Marajó Island, Pará, Brazil, with comments on its relationships (Characiformes: Characidae)

Marinho, Manoela M. F.; Bastos, Douglas A.; Menezes, Naércio A.

doi:10.1590/S1679-62252013000400002

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Article • Neotrop. ichthyol. 11 (04) • 2013 • https://doi.org/10.1590/S1679-62252013000400002 copy

New species of miniature fish from Marajó Island, Pará, Brazil, with comments on its relationships (Characiformes: Characidae)

Authorship SCIMAGO INSTITUTIONS RANKINGS

A new miniature species of the family Characidae from Marajó Island, Pará State, Brazil is described and assigned to the genus Tyttobrycon. The new species can be distinguished from its congeners primarily by having multicuspid teeth on jaws, and additionally by having the combination of 5-7 premaxillary teeth, dorsal fin only with scattered melanophores and the presence of an adipose fin.

Aphyoditeinae; Neotropical; Sexual dimorphism; Systematics; Tetra

			Paratypes
	Holotype	n	range	Mean	SD
Standard length (mm)	17.9	31	15.6-21.1	18.6	-
Percentages of standard length
Depth at dorsal-fin origin
Males	27.9	14	25.4-29.4	27.4	1.3
Females	-	17	29.1-36.1	32.2	1.8
Snout to dorsal-fin origin	50.0	31	49.6-54.6	52.3	1.4
Snout to pectoral-fin origin	29.4	31	26.7-32.2	29.2	1.2
Snout to pelvic-fin origin	48.9	31	48.0-55.7	50.9	1.7
Snout to anal-fin origin	63.4	31	62.5-69.4	65.2	1.9
Caudal-peduncle depth	12.3	31	9.1-13.0	11.3	0.9
Caudal-peduncle length	15.3	31	12.4-17.4	15.0	1.3
Pectoral-fin length
Males	20.7	14	18.1-23.6	21.0	1.5
Females	-	17	16.5-21.0	18.6	1.4
Pelvic-fin length
Males	19.5	14	17.8-20.4	19.4	0.7
Females	-	17	14.4-17.9	16.4	0.9
Pelvic-fin origin to anal-fin origin	14.2	35	12.018.8	15.0	1.8
Dorsal-fin length	27.9	31	24.1-29.8	26.9	1.8
Dorsal-fin base length	12.2	31	10.5-15.4	13.0	1.0
Anal-fin length	18.6	31	17.5-22.4	19.8	1.5
Anal-fin base length	22.6	31	18.1-25.6	22.0	1.7
Eye to dorsal-fin origin	37.7	31	35.3-41.3	38.9	1.3
Dorsal-fin origin to caudal-fin base	50.0	31	50.0-56.3	52.5	1.5
Head depth	23.2	31	22.0-28.5	24.8	1.5
Head length	30.7	31	27.1-32.0	29.4	1.5
Percentages of head length
Horizontal eye diameter	41.2	31	35.9-46.6	41.1	2.6
Snout length	21.7	31	17.2-24.1	20.5	1.5
Interorbital width	28.6	31	24.3-31.0	28.5	1.6
Upper jaw length	33.3	31	28.5-40.1	33.6	2.5

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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