Pseudotocinclus Nichols 1919
Creators: name: Takako, Adriana Kazue
name: Oliveira, Claudio
name: Oyakawa, Osvaldo Takeshi
Publisher: name: Zenodo
Year: 2005
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Actinopterygii
Siluriformes
Loricariidae
Pseudotocinclus

description: <i>Pseudotocinclus</i> Nichols, 1919 <i>Pseudotocinclus</i> Nichols, 1919: 533. Type species: <i>Pseudotocinclus intermedius</i> Nichols, 1919:534, by monotypy. Gender: masculine. <b>Diagnosis.</b> The genus <i>Pseudotocinclus</i> can be diagnosed from other Hypoptopomatinae by the presence of a caudal peduncle that is nearly square in cross section from the posterior base of the dorsal fin to the caudal fin, and the following combination of characters: 26 or more plates along the lateral line, a dorsally positioned eye, an exposed preopercle, and an abdomen covered with numerous small platelets. <b>Description.</b> Dorsal surface of trunk near the dorsal fin forming a depression, which becomes progressively posteriorly flattened near caudal peduncle; ventral surface of trunk between the anal fin and caudal peduncle flattened; dorsal series of plates extending from origin of dorsal-fin to end of caudal peduncle. Mid-dorsal series of plates interrupted; only four to five plates counting from origin of dorsal-fin. Plates of median series dorsally expanded and touching dorsal series of plates. Median series complete. Mid-ventral series of plates interrupted at 17-22 plates, counting from compound pterotic. Ventral series of plates complete, counting from near origin of ventral-fin unbranched ray to end of caudal peduncle; dorsal and ventral series of plates forming distinct longitudinal keels; second nuchal plate large and fused to first proximal radial; first dorsal-fin unbranched ray present; non-functional dorsal-fin locking mechanism. Abdomen entirely covered by numerous platelets; area between pelvic fin and urogenital pore scarcely covered by platelets. Dorsal fin I,7; pectoral fin I,6; ventral fin i,5; anal fin i,5; caudal fin i,14,i. Adipose fin absent. Snout tip naked or covered with small platelets, with odontodes; all teeth bicuspid, inner cusp greater than outer cusp; maxillary barbel present. Major area of scapular bridge covered with skin with platelets, leaving only small ventrolateral portion of coracoid exposed; males with urogenital papilla and dermal flap on entire length of dorsal surface of pelvic-fin unbranched ray; pelvic-flap distinctly higher near pelvic-fin base. Proximal tips of first and last pterygiophores of anal fin lying ventral to hemal spines of vertebrae 15 and 19 respectively; total vertebrae 32-33; perforated plates of lateral line 23-32; dark-brown midlateral stripe extending from snout to end of caudal peduncle. Three to four transverse dark-brown bands on dorsal region of body coalesced with midlateral stripe. <b>Distribution.</b> Species of this genus are found in the upper rio Tietê basin, São Paulo, in the ribeirão Grande, a tributary of the middle course of the rio Paraíba do Sul, Pindamonhangaba, São Paulo, in the headwaters of rio Itatinga, a coastal river of São Paulo, and in the upper and lower courses of the rio Juquiá, rio Ribeira de Iguape basin, São Paulo (Fig. 1). <b>Key to the species of <i>Pseudotocinclus</i>:</b> 1. Orbital ring not prominent or conspicuous; parieto-supraoccipital and paired compound pterotic with low crest; parieto-supraoccipital bordered posteriorly by 3-6 large plates..……………………………………..……………….2 1’. Orbital ring very prominent and conspicuous; parieto-supraoccipital and paired compound pterotic with very high crest; parieto-supraoccipital bordered posteriorly by ten or more small plates …..................…..........… <i>P. juquiae</i> 2. Frontal in contact with compound pterotic at orbital margin, separating sphenotic from orbit margin; snout tip usually covered by small platelets with odontodes...............................…....................................................... <i>P. parahybae</i> 2’. Frontal separated from compound pterotic at orbital margin by sphenotic, which contributes to the orbital margin; snout with small naked area at tip................... <i>P. tietensis</i>
description: Published as part of <i>Takako, Adriana Kazue, Oliveira, Claudio &amp; Oyakawa, Osvaldo Takeshi, 2005, Revision of the genus Pseudotocinclus (Siluriformes: Loricariidae: Hypoptopomatinae), with descriptions of two new species, pp. 499-508 in Neotropical Ichthyology 3 (4)</i> on pages 500-501, DOI: 10.1590/S1679-62252005000400007, http://zenodo.org/record/5417891
description: {"references": ["Nichols, J. T. 1919. Um novo genero de cascudos da familia Loricariidae. Revista do Museu Paulista, 11: 533 - 535."]}