Oxyoppia (Oxyoppiella) minuscula, Hugo-Coetzee & Lotfollahi & Abbasi-Kalo & Movahedzade, 2017

Hugo-Coetzee, Elizabeth A., Lotfollahi, Parisa, Abbasi-Kalo, Ayda & Movahedzade, Elnaz, 2017, A new species of Oxyoppia (Oxyoppiella) (Acari: Oribatida: Oppiidae) from Iran, Turkish Journal of Zoology 41 (4), pp. 630-637 : 630-633

3.1. Generic diagnosis: Oxyoppia Balogh and Mahunka, 1969

(From Balogh and Mahunka, 1969; Balogh, 1983; Subías and Rodríguez 1986.)

Type species: Oppia spinosa Hammer, 1958 .

Bothridial seta fusiform, setiform or lanceolate, not globular; lamellar seta mostly closer to interlamellar seta than to rostral seta; 0–3 pairs of sigillae between bothridia; humeral region with developed process; notogastral seta c 2 mostly well developed, adjacent to humeral process, 9–10 pairs of short to long notogastral setae; 4–6 pairs of genital setae, 1 pair of aggenital, 2 pairs of anal, 3 pairs of adanal setae; lyrifissure iad in various positions; ad 1 mostly postanal, ad

3

preanal.

3.2. Subgeneric diagnosis: Oxyoppia (Oxyoppiella) Subías and Rodríguez, 1986

(From Subías and Rodríguez, 1986 and known species, including new species described below.)

Type: Oppiella polynesia Hammer, 1972 .

Small species (length 160–287); rostrum not incised [except possibly O. bituberculata bituberculata (Balogh, 1958) , rostrum bidentate in Balogh (1961a), rounded in Mahunka (1983)], lamellar costula present, translamella mostly present [possibly absent in O. vtorovi ( Rjabinin, 1987) ]; bothridial seta scopulate, fusiform to lanceolate fusiform; interbothridial tubercles present or absent; humeral process distinct, additional crista present or absent; 10 pairs of notogastral setae, c 2 present, medially to humeral process, but shorter than other setae, other notogastral setae smooth or ciliate, short to medium in length, position of seta lm to la variable; ad 1 postanal.

3.3. Description of new species: Oxyoppia (Oxyoppiella) minuscula sp. nov.

( Figures 1A and 1B )

Specific diagnosis. Translamella present; weak crista present anterior of notogaster; ciliated notogastral setae, setae lm anteromedially to la; shallow apodeme 4; cerotegumental extensions at pedotectum II present; adanal seta ad 3 posteromedially to aggenital seta, ad 2 posterior to lyrifissure iad, iad inverse apoanal, almost longitudinally orientated.

Measurements. Holotype (female): length 166, width 81; paratypes, all female (n = 8), length: mean 173 (range 160–180); width: 83 (82–85).

Integument. Body surface smooth; exobothridial region weakly granulated, cerotegumental extensions at pedotectum II.

Prodorsum. Rostrum rounded; rostral seta (ro 8–12) located dorsolaterally, slightly thickened, smooth, lamellar seta (le 6–8) thin, weakly ciliate, interlamellar seta (in 3–6), exobothridial seta (ex 8–9) thin, smooth, le closer to in than to ro, ex inserted on tubercle anterolaterally to bothridium; distinct lamellar costula present, extending from the bothridium to le; curved translamella present, less distinct than lamellar costula, le inserted on tubercle at junction of costula and translamella; interbothridial tubercle present posterior to in, extending to anterolateral of in; bothridium with posterior tubercle; bothridial seta (bs 20–31) fusiform to scopulate, head with 13 to 16 setulae of similar lengths on the outer side, inner side with very small indistinct cilia; distinct sigillae anterior of bothridium visible, sigillae between in could not be observed.

Notogaster. Distincthumeralprocesspresent,additional weak crista present posterior to in; 10 pairs of notogastral setae present, c 2 thin, smooth, short (2–3), halfway between humeral process and crista, other setae thin, weakly ciliate, of similar length (7–12), seta lm anteromedially to la; seta lp anteromedially to h 3; lyrifissures ia, im distinct (4–7), ia located in humeral process, im longitudinally orientated.

Epimeral region. Seta h (5—6) thin, with 1 cilium, m (4–6), thin, smooth, a could not be observed; all epimeral setae thin, smooth, short, of similar length (3–6); discidium distally weakly triangular, apodeme 4 shallow, i.e. only slightly extending past anterior level of genital plates.

Anogenital region. All setae thin, smooth; 5 pairs of genital setae (2–3), g 1 on anterior border of genital plate; 1 pair of aggenital setae (ag 4–5), 2 pairs of anal setae (3–5), 3 pairs of adanal setae (ad 3–6), ad 3 posteromedially to ag, ad 2 posterior to lyrifissure iad; iad (5–9) thin, curved, inverse apoanal, almost longitudinally orientated.

Legs. Leg IV (85–101)> leg I (80–88)> leg III (65–82)> leg II (60–70); leg setation: leg I: 1-5-2(1)-4(2)-18(2), leg II: 1-5-2(1)-4(1)-13(2), leg III: 2-3-1(1)-3(1)-13, leg IV: 1-2-2-3(1)-10 (see Table for setation detail); morphology of legs, setae, and solenidia similar to that of Oxyoppia mustaciata Kun, 2014 , but differs slightly in relative shorter solenidia σ on genua I–III and solenidia φ on tibiae III–IV, setae s and (pv) on tarsus IV thick, fan-shaped.

Etymology. The species is named after the Latin for small, minusculus, since the new species is the smallest of all known O. (Oxyoppiella) species.

Type material. The holotype (IEAM-W-M14-OOM-1) and 4 adult paratypes from wheat field soil, 38°27′28.13″N, 45°51′15.60″E, 1327 m a.s.l.; 3 adult paratypes from wheat field soil, 38°26′37.45″N, 45°53′55.39″E, 1399 m a.s.l.; 1 adult paratype from grassland soil, 38°24′35.27″N, 45°55′21.99″E, 1541 m a.s.l.

The holotype and 7 paratypes are deposited at the Acarology Laboratory , Department of Plant Protection , Faculty of Agriculture , Azarbaijan Shahid Madani University , Tabriz ( Iran), and 1 paratype (IEAM-W-M14- OOM-2) is deposited in the Acarology Collection of the National Museum, Bloemfontein, South Africa .

Remarks. Oxyoppia (Oxyoppiella) minuscula sp. nov. is most similar to O. antillensis Mahunka, 1998 in having crista on the notogaster in addition to the humeral process, extended interbothridial tubercles, ciliated notogastral setae, and 5 pairs of genital setae. Oxyoppia minuscula sp. nov. differs from O. antillensis in the junction of the costula and translamella ( O. minuscula : translamella at the end of the costula; O. antillensis : costula extends one-third beyond translamella), the position of notogastral seta lm

HUGO-COETZEE et al. / Turk J Zool relative to la ( O. minuscula : anteromedially; O. antillensis : posteromedially), position of adanal seta ad 3 relative to aggenital seta ( O. minuscula : posteromedially, O. antillensis : posterolaterally). See key below for differentiation of O. minuscula sp. nov. from other species.

3.4. Key to species of Oxyoppia (Oxyoppiella)

(Body sizes in micrometers; for species distribution, see Section 3.5 and Figure 2.)

1. Notogastral seta lm anteromedially to la .................. 2

Notogastral seta lm posteromedially to la or slightly posteromedially to la ............................................................. 3

2. Translamella distinct, crista present in addition to the humeral process, seta ad 2 posterior to lyrifissure iad, 160–180 × 82–85 ................................. O. minuscula sp. nov.

Translamella indistinct or absent, crista absent, seta ad 2 anterior to lyrifissure iad, 229 × 106 ....................................... ...................................................... O. vtorovi ( Rjabinin, 1987)

Roman letters refer to normal setae, Greek letters refer to solenidia (except ε to famulus), parentheses indicate pairs of setae. Setae on the anterior side of a leg segment are indicated with a single accent (‘) and setae on the posterior side with a double accent (“).

3. Notogastral setae ciliate .............................................. 4

Notogastral setae smooth ............................................. 11

4. Five pairs of genital setae ........................................... 5

Six pairs of genital setae .................................................. 8

5. Notogastral seta h 3 anterolaterally to lp, seta p 3 anterolaterally to h 2, 108–200 × 80–92 ................................... ...................................... O. cubana Balogh & Mahunka, 1980

Notogastral setae lp, h 3 and p 3, h 2 almost on a transverse line ........................................................................................... 6

6. Crista present on notogaster in addition to the humeral process, 193–211 × 91–102 ..................................... .................................................. O. antillensis Mahunka, 1998

Crista absent, only humeral process present ................ 7

7. Humeral process short, interbothridial tubercle posterior to interlamellar seta present, interlamellar seta short, 200 × 110 ......................................................................... ................................................. O. bituberculata bituberculata (Balogh, 1958) (see also Balogh, 1961a; Mahunka, 1983)

Humeral process extending slightly backwards, interbothridial tubercle absent, interlamellar seta minute, 227 × 107 ................................................................................... ............................ O. bituberculata cognata (Wallwork, 1961)

8. Translamella interrupted medially, lamellar seta on cusp, 287 × 152 ........ O. saskai (Balogh, 1961b) (see also Mahunka, 1983)

Translamella complete, distinct or thin line, lamellar seta inserted in the junction between costula and translamella ............................................................................ 9

9. Humeral process extending backwards as a thin line, aggenital setae shorter than adanal setae, body surface punctuate, 205–240 × 115–125 ........................................... O. polynesia ( Hammer, 1972) (see also Subías and Sarkar, 1983)

Humeral process short, aggenital setae of similar length than adanal setae, body surface smooth ........................... 10

10. Costula smooth, converging, interbothridial tubercles reduced, length 250 ................................................. ................................................... O. baliensis ( Hammer, 1982)

Costulaindented, almostparallel, stronginterbothridial tubercle present, which almost reaches interlamellar seta, 220–229 × 114–119 .................... O. struthio Mahunka, 1983

11. Costula does not extend beyond translamella ..... 12

Costula extends beyond translamella ......................... 13

12. Costula and translamella connected with intricate loops, notogastral seta lm far posteromedial to la, seta lp posteromedial to h 3, 205–235 × 101–119 ............................... .......................................................... O. mustaciata Kun, 2014

Costula and translamella meeting normally, notogastral seta lm slightly posteromedial to la, seta lp anteromedial to h 3, length 250 .................. O. suramericana ( Hammer, 1958)

13. Interbothridial tubercle present, lamellar seta inserted at the junction of costula and translamella, stalk of bothridial seta short, 236–252 × 124–132 ......................... .................................................. O. spiculifera Mahunka, 1985

Interbothridial tubercle absent or represented by short crest, lamellar seta inserted anterior of junction of costula and translamella, stalk of bothridial seta long .................. 14

14. Interbothridial tubercle reduced to longitudinal crest, humeral process small, notogastral seta lp anteromedial to h 3, 275 × 135 .................................................. ...................... O. crassata Mahunka & Mahunka-Papp, 2012

Interbothridial tubercle absent, humeral process extending backwards up to level of notogastral seta la, seta lp posteromedial to or on transverse level with h 3, length 280 ............................................. O. scalifera ( Hammer, 1958)

Figures

Figure 1. Oxyoppia (Oxyoppiella) minuscula sp. nov. (legs removed). A: dorsal view, B: ventral view.