Acestrocephalus maculosus
Acestrocephalus maculosus Menezes, 2006
First described in: Menezes, N. A. (2006). Description of five new species of Acestrocephalus Eigenmann and redescription of A. sardina and A. boehlkei (Characiformes: Characidae). <em>Neotropical Ichthyology.</em> 4(4): 385-400.
Descriptions from checklists and floras indexed by GBIF
description
Description. Morphometrics of holotype and paratypes presented in table 10. Body relatively small (SL = 42.3 - 79 mm). Body form, dorsal and ventral body profiles, shape of snout and mouth and extension of maxilla as in A. sardina. Dorsal-fin rays ii, 9 in all specimens, n = 6, including holotype. Posterior most ray unbranched, n = 6. Adipose fin present. Anal-fin rays iv, 27 (iv or v, usually iv unbranched, branched rays mean = 26.5, range 25 - 27, n = 6, posterior ray split to its base and counted as 1). Moderately developed anterior anal-fin lobe including anterior unbranched rays and first 6 - 7 branched rays. No hooks on anterior rays of two sexually mature males (MZUSP 90162, 92 mm SL and MNRJ 12657, 62 mm SL). Pectoral-fin rays i, 14 (anterior branched ray i, n = 6) branched rays mean = 14, range 13 - 15, n = 6. Posterior tips of longest pectoral-fin rays reaching scarcely beyond pelvic-fin origin. Pelvic-fin rays i, 7, n = 6. No hooks on pelvic – fin rays of sexually mature males. Distal tips of longest pelvic-fin rays extending slightly beyond posterior border of anus, falling short of origin of anal fin. Principal caudal-fin ray count 10 / 9, n = 6. Lateral line complete,
Description of five new species of Acestrocephalus Eigenmann and redescription of A. sardina and A. boehlkei (Characiformes: Characidae)
diagnosis
Diagnosis. Acestrocephalus maculosus has a dark blotch at the humeral region, a character shared only with A. boehlkei and A. stigmatus. In the diagnosis of A. boehlkei the differences among these species are discussed. Acestrocephalus maculosus can be easily distinguished from A. stigmatus by the number of anal-fin rays (25 - 27 vs 29 - 31), and total number of gill-rakers (7 - 8 vs 5 - 6). See Tables 4 and 9. The general structure of the pseudotympanum of A. maculosus (Fig. 5 c) is quite peculiar and different from that of A. stigmatus (Fig. 5 d) and all the other species of Acestrocephalus examined (Figs. 5 a, b, e, f and g). In A. maculosus the muscular hiatus is very reduced as the result of the great development of the obliquus superioris muscle covering the anterior portion of the swim bladder. As a consequence, the opening anterior to first pleural rib, this and the second pleural rib as well as the obliquus inferioris muscle are not visible.
Description of five new species of Acestrocephalus Eigenmann and redescription of A. sardina and A. boehlkei (Characiformes: Characidae)
distribution
Distribution. Acestrocephalus maculosus is known only from tributaries of the upper Tocantins (Fig. 8).
Description of five new species of Acestrocephalus Eigenmann and redescription of A. sardina and A. boehlkei (Characiformes: Characidae)
etymology
Etymology. The species name maculosus, adjective, comes from Latin meaning spotted. It is in reference to the dark spots and stripes on the body of this species.
Description of five new species of Acestrocephalus Eigenmann and redescription of A. sardina and A. boehlkei (Characiformes: Characidae)
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From the GBIF Backbone Taxonomy and occurrence records (GBIF.org), with Wikipedia and the Source Library. GBIF species 2353363.