Francisco Provenzano

The Genus Henonemus (Siluriformes: Trichomycteridae) with a Description of a New Species from Venezuela

Abstract A new diagnosis for the trichomycterid genus Henonemus based on external characters is offered, and Henonemus triacanthopomus, new species, is described from the Orinoco River basin in Venezuela. The new species is distinguished from the other species of the genus by three or asymmetrically four opercular odontodes in specimens longer than 80 mm SL, a blackish ventral lobe of caudal fin, a row of mid-lateral dark blotches above the lateral line deflected dorsally on caudal peduncle, five interopercular odontodes inserted in the main series, and lower jaw teeth arranged in seven rows. Additionally we discuss the characters of external morphology that support monophyly of Henonemus, a less inclusive group within Stegophilinae comprising Acanthopoma, Apomatoceros, Henonemus, Megalocentor, Pareiodon, Parastegophilus, and Pseudostegophilus and a sister group relationship between Acanthopoma and Henonemus. Una nueva diagnosis para el género tricomictérido Henonemus basada en caracteres externos es ofrecida en el presente trabajo y se describe Henonemustriacanthopomus, especie nueva, para la cuenca del río Orinoco en Venezuela. La nueva especie se diferencia de las demás especies del género, por la presencia de tres o asimétricamente cuatro odontodes operculares en ejemplares mayores de 80 mm LE y por presentar el lóbulo ventral de la aleta caudal negruzco, la hilera media lateral de manchas situada encima de la línea lateral y desviada dorsalmente en la región del pedúnculo caudal, cinco odontodes interoperculares insertados en la serie principal y dientes de la mandíbula inferior dispuestos en siete hileras. Adicionalmente se discuten los caracteres de la morfología externa que soportan la monofilia de Henonemus, un grupo menos inclusivo dentro de Stegophilinae conformado por Acanthopoma, Apomatoceros, Henonemus, Megalocentor, Pareiodon, Parastegophilus y Pseudostegophilus y una relación de grupo hermano entre Acanthopoma y Henonemus.

Creagrutus hysginus (Teleostei: Characiformes), a New Species of Characid from Northeastern Venezuela, Sucre State

red adipose fin and the presence of dark pigment on only the lateral, unbranched ray of the pectoral fin. Other characters which, in combination, serve to distinguish C. hysginus include the presence of hooks on only the first two or three anal-fin rays, nine or 10 anal-fin rays, and a rounded or blotchlike humeral mark. Una nueva especie de Creagrutus es descrita basada en material proveniente de los rios que drenan en el Golfo de Paria, en el Noreste de Venezuela. Esta especie se distingue por caracteres derivados en la pigmentacion de las aletas, incluido una aleta adiposa rojo brilliante y la presencia de pigmentos oscuros sobre solo el radio simple y lateral de la aleta pectoral. Otros caracteres que en combinaci6n sirven para distinguir a C. hysginus, incluyen la presencia de ganchos sobre solo primeros 2 6 3 radios anales, 9 6 10 radios anales y una mancha humeral redondeada.

New record of Rineloricaria daraha Rapp Py-Daniel & Fichberg, 2008 from Rio Paca, upper Rio Negro, Amazon River basin

The geographic distribution of a catfish of the family Loricariidae, Rineloricaria daraha Rapp Py-Daniel and Fichberg, 2008, which was only known from its type locality within the Rio Daraa, Brazil, is extended here within the Rio Negro basin to Colombia. This new record from Colombian territory is more than 700 km apart, in hydrological distance, from previously recorded locality in the Rio Daraa. Illustrations of diagnostic characters and morphometrics are provided based on Colombian specimens.

Rediscovery of Chaetostomus setosus Boulenger 1887 (Siluriformes, Loricariidae), and assessment of the external characters used for determination of genera within the Chaetostoma group

During a survey of loricariid catfishes from Colombia, specimens that match the original description of Chaetostomus setosus Boulenger, 1887 were found. This is the first record after the original description. A redescription and a precise capture locality of the species are provided. The analysis of external characters indicate that the species belongs within the Chaetostoma group; however, specimens of C. setosus possess a mixture of external characters that make generic identification difficult. Tentatively, the species is allocated to the genus Cordylancistrus. External morphology of the known species that belong to the Chaetostoma group (mainly type specimens) was analyzed to find diagnostic characters that may be used for appropriate generic assignment. The results of this analysis are presented herein.

Parodon orinocensis (Bonilla et al., 1999) (Characiformes: Parodontidae): emendations and generic reallocation

During recent studies on Parodontidae, specimens of the Venezuelan species Parodon orinocensis (Bonilla, Machado-Allison, Silvera, Chernoff, Lopez & Lasso, 1999) were examined and a few incongruencies with the original description of the species were noted. Emendations to the descriptions of the jaw teeth and color pattern are presented. Three autapomorphies were also observed and are listed herein. The species is moved from genus Apareiodon to Parodon based on presence of dentary teeth.