Description of Micropygomyia (Silvamyia) echinatopharynx sp. nov. (Diptera: Psychodidae) a new species of phlebotomine sand fly from the State of Tocantins, Brazil

Abstract

During a study of the phlebotomines of the Brazilian state of Tocantins, a new species was discovered in PortoNacional county, here described as Micropygomyia (Silvamyia) echinatopharynx sp. nov. This is only the second species of the subgenus Micropygomyia (Silvamyia) to be described.Key words: Micropygomyia (Silvamyia) echinatopharynx sp. nov.-Phlebotominae -sand fly -Diptera -PsychodidaeThe genus Micropygomyia Barretto, 1962 has as its main characteristics the palpal formula: 1.2.3.4.5 or 1.(2.4).3.5, or 1.2.4.3.5, the absence of the papilla on the third flagellomere of the setae on the anterior katepisternum margin and of the postalar bristle, and labium with united sutures. This genus is divided into four subgenera, one of them, Silvamyia Galati, 1995 being composed of only one species, Micropygomyia (Silvamyia) acanthopharynx (Martins Falcão & Silva, 1962), which is characterized by well developed teeth in the pharynx, an AIII longer than the head (male) or about 0.9 times its length (female) and a gonostyle with only one apical spine.Thirty-five species have so far been reported in Tocantins, the new species having been captured in Porto Nacional county in orchards and around houses (Andrade Filho et al. 2001). We present the following description of the new species, named Micropygomyia (Silvamyia) echinatopharynx sp. nov., this name referring to the large number of spines in the pharynx.The measurements are given in micrometers, with the mean and standard deviation values for the paratypes in parentheses. Several characters have been submitted to variance analysis (ANOVA) at the 5% significance level. For some other characters the Mann-Withney Test was used when it was impossible to apply ANOVA, that is to say, when the samples did not meet the necessary presupposition for the latter to be used; the values did not present normal distribution, constant variation or independence. The classification follows that proposed by Galati (1995) and the terminology of the characters is in accordance with Galati (2003). Holotype female: total length 2650 (2676 ± 60.0, n = 12). Coloration pale chestnut, the pleurae being paler than the notum. Head (Table I)