Gymnaceria, Oliveira, Anibal R., Rodrigues, Daniela F. S. & Flechtmann, Carlos H. W., 2012

Oliveira, Anibal R., Rodrigues, Daniela F. S. & Flechtmann, Carlos H. W., 2012, A new eriophyoid mite genus and species, Gymnaceria cupuassu (Acari: Eriophyidae), described from the cupuaçu tree in Brazil, Zootaxa 3559, pp. 53-57 : 54

Gymnaceria n. gen.

( Figs. 1–2 )

Type species: Gymnaceria cupuassu n. sp.

Diagnosis. Body vermiform, almost circular in cross section; gnathosoma small; prodorsal shield subtriangular; scapular tubercles on rear shield margin; scapular setae (sc) directed posteriorly; all coxal setae present; legs with all usual setae and simple empodia; opisthosomal annuli mostly continuous dorsoventrally, usually more numerous dorsally, mostly microtuberculated; female genitalia located at a moderate distance behind coxae; coverflap furrowed; opisthosomal ventral seta II (e) absent.

Remarks. Based on the key to genera by Amrine et al. (2003), the new genus is close to Aceria Keifer 1944 , but differs from it in the absence of the second ventral opisthosomal seta e, a stable character based on approximately 700 females, males and immature specimens that were examined. Although the absence of seta e is also shared in Aceriini with Paraphytoptella Keifer 1959 and Ramaculus Manson 1984 , the new genus differs from the first in the absence of dorsal semiannuli in the posterior third of the opisthosoma which are broadened into tergites covering two or more sternites each and from the second, mainly in the presence of coxal seta I (1b) and tibial seta (l') ( Keifer 1959; Manson 1984).

Etymology. The generic name is derived from the Ancient Greek term gymnós for ‘naked’ or ‘nude’, regarding the absence of the second ventral opisthosomal setae plus the name of the closest genus, Aceria . The gender is feminine.

Figures

FIGURE 1. Gymnaceria cupuassu n. gen. et n. sp., female. D. Dorsal habitus; V. Ventral habitus.

FIGURE 2. Gymnaceria cupuassu n. gen. et n. sp. L. Lateral habitus, female; OL. Opisthosoma lateral, female; E. Ven t ral view of empodium, Leg I, female; IGF. Internal genitalia, female; GM. External genitalia, male; L 1. Leg I, antiaxial view, female; L 2. Leg II, antiaxial view, female.