Solenidiversum, VidovićK & K & OrapaK, 2023

VidovićK, Biljana, K, Tatjana Cvrković & OrapaK, Warea, 2023, A new genus and new species of eriophyid mites from Papua New Guinea: a potential biological control agent ofFalcataria moluccana (Fabaceae), Acarologia 63 (3), pp. 933-944 : 935-936

Genus Solenidiversum gen. nov. Vidović

Zoobank: 1D18B589-59F1-4E76-988C-167423810536

( Figs. 1 & 2 )

Type species — Solenidiversum falcatariae sp. nov.

Diagnosis — The subfamily Nothopodinae Keifer 1956 are distinguished from the other subfamilies of Eriophyidae by: the tibia of the legs is reduced or completely fused with the tarsus, tibia I without setae and tarsus without spatulate projections.

Within the subfamily Nothopodinae , it is possible to distinguish two tribes, Nothopodini Keifer 1956 and Colopodacini Mohanasundaram 1984 . The characteristics of tribe Colopodacini are the presence of coxal setae 1b, coxae of leg I usually weakly divided and tibia of leg I completely fused with the tarsus, except in the genus Thaicesa Koçak & Kemal , which has very small tibiae. The characteristics of Nothopodini are the absence of coxal setae 1b, coxae and tibiae of leg I variable.

Solenidiversum gen. nov. belongs to Colopodacini with coxal setae I 1 (b) present, tibiae of legs I and II completely fused with tarsus; empodium entire; solenidion on tarsus I on inner side of tarsus; solenidion on tarsus II in dorsal position; all leg setae present; scapular tubercles on rear shield margin; setae sc projecting backward; prodorsal shield with small subtriangular frontal lobe; body vermiform; opisthosoma evenly round and with annuli subequal dorsoventrally, entirely microtuberculated; all ventral opisthosomal setae present; accessory setae (h1) absent.

Remarks — It should be noted that fifteen genera have been described from the tribe Colopodacini . From nine of those genera, the tibia of leg I is completely fused with the tarsus ( Colopodacus Keifer , Apontella Boczek & Nuzzaci , Paracolopodacus Kuang & Huang , Adenocolus Meyer & Ueckermann , Pseudocolopodacus Kuang , Dicolopodacus Huang , Kuangella Wei , Taicolopodacus Huang & Wang , and Juxtacolopodacus Flechtmann & De Queiroz ) and in the other six Thaicesa ( Koçak & Kemal 2008, Calliparus Li, Setibia Duarte

& Navia, Aricolopodos Duarte & Navia, Calareolata Han & Zhang and Reginesus Reis & Navia ) the tibia is reduced and very short, but not completely fused with the tarsus ( Keifer 1960 ; Boczek and Nuzzaci 1988 ; Kuang and Huang 1994 ; Boczek and Chandrapatya 1996 ;

Meyer and Ueckermann 1997 ; Kuang 1997 ; Huang 2001 ; Wei and Quin 2002 ; Koçak and

Kemal 2008; Huang and Wang 2009 ; Flechtmann and De Queiroz 2010 ; Li et al. 2010 ; Reis et al. 2012 ; Duarte et al. 2017 ; Han and Zhang 2019).

Therefore, it is necessary to emphasize that the fusion of the tibia with the tarsus is not a distinguishing characteristics of the tribe Colopodacini , as specified in the Revised Keys to the World Genera of the Eriophyoidea ( Amrine et al. 2003). Тhe character that distinguishes the Colopodacini tribe from the Nothopodini tribe within the subfamily Nothopodinae is the presence (in Colopodacini ) versus the absence of 1b coxal setae ( Nothopodini ).

Differential diagnosis — The new genus is placed in Colopodacini , Nothopodinae , Eriophyidae, Eriophyoidea. There are sixteenth genera in Colopodacini . This new genus has the solenidion on the inner side of tarsus I, differentiating it from all other genera of the tribe.

The feature of displaced solenidia of leg I has so far been recorded in the genus Juxtacolopodacus (tribe Colopodacini ), where the solenidion is displaced laterally, and in the genus Floracarus ( Nothopodini ) with a solenidion on the inner side of the tarsus ( Flechtmann et al. 2010, Meyer & Ueckermann 1997).

This new genus, like Thaicesa , Adenocolus, Caliparus and Setibia , has scapular tubercles and setae on rear prodorsal shield margin. It differs from Thaicesa and Adenocolus in the presence of bv setae on both legs (absent on both legs in Thaicesa , absent on leg II in Adenocolus ). It differs from Caliparus by the fused tibia and tarsus (distinct tibia and tarsus in Caliparus). This new genus is most similar to Setibia, because only these two genera within the tribe Colopodacini have a worm-like body shape, unlike the other fourteen genera of this tribe. It differs from this genus, however, in the complete fusion of the tibia with the tarsus on both legs (in Setibia the tibia is reduced, but distinct) and in the absence of a prominent frontal lobe as in Setibia.

Etymology — The genus name Solenidiversum is a combination of Soleni (from the Latin solenidion – optically inactive chemosensory seta) and diversum (from the Latin diversus, meaning opposite). It refers to the opposite positions of the solenidion on the tarsus of leg I (ventral positions) in relation to the positions of the solenidion on the tarsus of leg II (dorsal positions). Gender: neutral

Figures

Figure 1 Line drawings ofSolenidiversum falcatariae sp. nov.: AD–prodorsal shield; AL–lateral view of anterior body region; CG–female coxigenital region; em–empodium; GM–male genital region; IG–internal female genitalia; LO–lateral view of annuli; L1–leg I; L2–leg II; PM–lateral view of posterior opisthosoma. Scale bar: 10 μm for AD, AL, CG, GM, IG, PM; 5 μm for L1; 2.5 μm for em.

Figure 2 Scanning electron micrographs ofSolenidiversum falcatariaesp. nov.: A–dorsal view of whole mite; B–dorsal view with the detail of pro-dorsal shield; C–ventral view, anterior part; D–ventral view, anterior part; E–ventral view of whole mite; F–lateral view, anterior part.