Oulenziella Fan & Zhang

Fan, Qing-Hai, George, Sherly, Li, Dong-Mei & Zhang, Zhi-Qiang, 2015, Establishment of Oulenziella gen. nov. for Oulenzia bakeri (Hughes, 1962) (Acari: Winterschmidtiidae), Zootaxa 3949 (2), pp. 191-202 : 192-193

Oulenziella Fan & Zhang , gen. nov.

Type species: Calvolia bakeri Hughes, 1962: 59 (= Oulenzia arboricola sensu Baker & Warton, 1952 , 342; misidentification).

Description. FEMALE. Ocelli present; prodorsal shield slightly widened posteriorly; setae sce about 3× to 5× as long as sci; supracoxal setae scx slender and barbed; hysterosomal setae e2 about as long as e1; each tarsus (excluding pretarsi) more than 4× as long as its basal width. Genu I with solenidion σ″: σ ′=3 to 4.5; σ on genu III small; seta d on tarsi III and IV positioned at level of apical 1/8 to 1/6 of tarsi. Chaetotaxy and solenidiotaxy of legs I–IV: trochanter 1, 1, 1, 0; femora 1, 1, 0, 0; genua 2 + 2σ, 2 + 1σ, 1σ, 0; tibiae 2 + 1φ, 2 + 1φ, 1 + 1φ, 1 + 1φ; tarsi I with 4 long setae (wa, ra, la and d), 2 small apical setae (f and e) + 1 subterminal ventral spine (s) + 2 basally merged terminal ventral spines (u + p and v + q) + ω1 + ω2 + ω3 + 1ε; tarsus II similar to tarsus I but without ω2, ω3 and ε; tarsus III with 3 long seta (w, r and d), 2 small apical setae (f and e) + 1 subterminal ventral spine (s) + 2 basally merged terminal ventral spines (u + p and v + q); tarsus IV with 3 long seta (w, r and d) + 1 subterminal ventral spine (s) + 2 basally merged terminal ventral spines (u + p and v + q).

MALE. Similar to female but genital opening with an aedeagus situated between coxae IV; anterior rim of epigynal sclerite contiguous with medial part of apodemes IV; ventral setae 3a and 4a absent; tarsi I and II (excluding pretarsi) less than 3× as long as their basal width, their apicoventral portion modified into suckers; subterminal ventral spine (s) of tarsi I–II indiscernible; terminal ventral spines p and q of tarsi I and II blunt.

Etymology. The generic name is derived from Oulenzia ; feminine in gender.

Remarks. This genus belongs to the subfamily Oulenziinae, which includes also four other genera: Oulenzia Radford, 1950 , Acalvolia Fain, 1971 , Procalvolia Fain, 1971 and Psylloglyphus Fain, 1966 . Fan et al. (2012) showed clearly that O. bakeri does not belong to Oulenzia . The main characters of these five genera are compared in detail in Table 1 . This new genus is similar to Oulenzia , but can be distinguished from the latter in having hT present on tibiae I and II, kT on tibia IV, la and ra on tarsus II, w and r on tarsus III, e and f on tarsi I–III, and seta d on tarsi III and IV positioned at level of apical 1/8 to 1/6 of the segments. However, the new genus is more closely related to Procalvolia , but differs from the latter in having an elongated solenidion σ″ on genu I, with σ″: σ ′ ratio of 3 to 4 (versus σ″: σ ′ ratio 1 to 2 in Procalvolia ). We think the elongation of the solenidion σ″ is a very significant event in the evolution of these genera. This feature is also often used to separate genera in the family Acaridae .

Seta d on tarsi III and IV At level of apical At level of apical At level of apical At level of apical At level of apical

1/3 of tarsi 1/8–1/6 of tarsi 1/8–1/6 of tarsi 1/8–1/6 of tarsi 1/8–1/6 of tarsi Habitat Plants Plants Stored products Vertebrate nests Plants and stored

products Key to genera of the subfamily Oulenziinae (adult females)

1. Prodorsal shield with a pair of ocelli on its anterolateral margins............................................... 2

-. Prodorsal shield without ocelli........................................................................... 4

2. Tibiae I and II each with one seta (gT); tibia IV without ventral seta; tarsus II without setae la or ra, tarsus III without seta w ................................................................................... Oulenzia Radford, 1950

-. Tibiae I and II each with 2 setae (gT and hT); tibia IV with a ventral seta (kT); tarsus II with setae la and ra, tarsus III with seta w .............................................................................................. 3

3. Solenidia of genu I σ″: σ ′=3 to 4.5; idiosomal setae e2 nearly as long as e1 .......................... Oulenziella gen. n.

-. Solenidia of genu I σ″: σ ′=1 to 2; idiosomal setae e2 1.5 × to 2× as long as e1 ..................... Procalvolia Fain, 1971

4. Spermathecal duct long, forming 5–6 loops............................................. Psylloglyphus Fain, 1966

-. Spermathecal duct short, not forming loops................................................. Acalvolia Fain, 1971

Tables

TABLE 1. Comparison of morphological and ecological characters of the genera in the subfamily Oulenziinae.

	Oulenzia Radford, 1950	Oulenziella gen. n.	Procalvolia Fain, 1971	Psylloglyphus Fain, 1966	Acalvolia Fain, 1971
Ocelli	Present	Present	Present	Absent	Absent
Prodorsal setae sce: sci	> 6	3 to 5	3 to 4	3?	2 to3
Idiosomal setae e 2	≥ 2× e 1	≤ 1× e 1	1.5× to 2× e 1	≤ 1× e 1	≤ 1× e 1
Spermathecal duct	moderate, not forming loops	moderate, not forming loops	Unknown	long, forming 5-6 loops	moderate, not forming loops
Genual solenidia σ″: σ ′	> 5	3 to 4.5	1 to 2	1?	<2
Tibial setae hT I-II and kT IV	Absent	Present	Present	Present	Present
Tarsal setae la II, ra II and w III	Absent	Present	Present	Present	Present