A contribution to the knowledge of Quadraseta brasiliensis Goff and Gettinger, 1989 (Trombidiformes: Trombiculidae), with description of the deutonymph instar

G R Bauchan,E Hingst-Zaher,S Muñoz-Leal,D M Barros-Battesti,R Ochoa,J A Mendoza-Roldan,F C Jacinavicius,R Bassini-Silva

doi:10.24349/acarologia/20184252

Abstract

In the Neotropical region the genus Quadraseta Brennan, 1970, includes 14 species, with ectoparasitic habits during the larval stage. Quadraseta brasiliensis Goff and Gettinger, 1989, was described from larvae collected on the rodent Hylaeamys megacephalus (Fisher), cited as Oryzomys capito (Olfers). According to these authors, the holotype was deposited in the Museu de Zoologia da Universidade de São Paulo and the paratypes were deposited in three other collections: Bernice Pauahi Bishop Museum, Sam Noble Oklahoma Museum of Natural History and United States National Museum of Natural History, however, no type specimens were found in any of these museums. Here we redescribe the larva, describe the deutonymph instar obtained from field-collected larvae, and report new hosts and localities for this species in Brazil. In addition we provide sequences of the 18S ribosomal RNA gene for this species.

Highlights

Around 3,000 species of chigger mites (Trombidiformes: Trombiculidae) have been described worldwide (Goff et al 1982), and most of this diversity is known only by the type specimens
Slide-mounted larvae of Quadraseta deposited in the NMNH, which are housed at the Systematic Entomology Laboratory (BARC-USDA-ARS), and in the Acari Collection from Butantan Institute, São Paulo, Brazil (IBSP), were examined and identified based on the original descriptions of the 14 known Quadraseta species
Diagnosis — Larva. (Figures 1, 2 and 3A; Table 1) Palpal tibia setae branched, galeal setae nude, claviform trichobothria, 2 humeral setae, the first row of idiosomal dorsal setae are arranged in line with 8 setae, genu of leg I with 3 solenidia, the base of microseta is proximal to the base of solenidion on the tarsus of leg I

Summary

Introduction

Around 3,000 species of chigger mites (Trombidiformes: Trombiculidae) have been described worldwide (Goff et al 1982), and most of this diversity is known only by the type specimens. While the majority of larvae from this group of mites are ectoparasites that feed on terrestrial vertebrates, other active stages are arthropod predators. Because of their parasitism in larval stage, the taxonomy of these mites has been based on this stage (Miyajima and Okumura 1917). How to cite this article Jacinavicius F.C. et al (2018), A contribution to the knowledge of Quadraseta brasiliensis Goff and Gettinger, 1989 (Trombidiformes: Trombiculidae), with description of the deutonymph instar.

Methods

Results

Conclusion