Acestrocephalus pallidus
Acestrocephalus pallidus 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 additional specimens presented in Table 14. Meristic and morphometric data based on all examined lots because no statistical differences found among population samples studied. Body relatively small (SL = 40 - 66 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 = 60, including holotype. Posterior most ray unbranched, n = 60. Adipose fin present. Anal-fin rays iv, 33 (iv or v, usually iv unbranched, branched rays mean = 33.5, range 32 - 36, n = 60, posterior ray split to its base and counted as 1). Moderately developed anterior anal-fin lobe including anterior unbranched rays and first 10 - 11 branched rays. No hooks on anal-fin rays, but sexual mature males not represented in the samples. Pectoral-fin rays i, 13 (anterior unbranched ray i, n = 60 branched rays mean = 13, range 11 - 15, n = 60). Posterior tips of longest pectoral-fin rays reaching slightly beyond origin of pelvic fin. Pelvic fin i, 7, n = 60. No hooks on pelvic-fin rays. Distal tips of longest pelvic-fin rays reaching anal-fin origin. Principal caudal-fin ray count
Description of five new species of Acestrocephalus Eigenmann and redescription of A. sardina and A. boehlkei (Characiformes: Characidae)
diagnosis
Diagnosis. Acestrocephalus pallidus is distinguished from A. boehlkei, A. maculosus and A. stigmatus by lacking the dark humeral blotch characteristic of these species. Acestrocephalus pallidus has the eye smaller than A. sardina and A. nigrifasciatus (Fig. 4) and fewer maxillary teeth (30 - 38 vs 40 - 46. See Fig. 6). It differs from A. acutus by having only scattered dark chromatophores instead of the typical oblong dark blotch on the caudal-fin base of that species and the first pleural rib, the cavity anterior to it and the obliquus inferioris muscle visible vs entirely covered by the fibers of the obliquus superioris muscle in A. acutus (compare Figs. 5 f and 5 g).
Description of five new species of Acestrocephalus Eigenmann and redescription of A. sardina and A. boehlkei (Characiformes: Characidae)
distribution
Distribution. Known only from rio Madeira and rio Machado, a tributary of rio Madeira (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 pallidus, adjective, from the Latin for pale is in reference to the overall body color of this species.
Description of five new species of Acestrocephalus Eigenmann and redescription of A. sardina and A. boehlkei (Characiformes: Characidae)
Where it has been recorded
Recorded sightings
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geo-referenced records in GBIF, from museums, herbaria and field observers.
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In the stacks
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Every page naming Acestrocephalus pallidus in the Biodiversity Heritage Library →
From the GBIF Backbone Taxonomy and occurrence records (GBIF.org), with Wikipedia and the Source Library. GBIF species 2353361.