Angullozetes arilloi, Ermilov & Shtanchaeva & Subías, 2018

Ermilov, Sergey G., Shtanchaeva, Umukusum Ya. & Subías, Luis S., 2018, Contribution to the knowledge of the oribatid mite genus Angullozetes (Acari: Oribatida: Scheloribatidae), Ecologica Montenegrina 18, pp. 75-81 : 76-80

Angullozetes arilloi sp. nov.

( Figures 1–12 )

Diagnosis. Body size: 225–254 × 131–147. Rostral, lamellar, interlamellar, notogastral, epimeral and anogenital setae short, setifrom, thin, smooth. Bothridial setae clavate, barbed.

Four pairs of rounded porose areas. Aggenital setae absent. Ventral side of body indistinctly striate.

Description. Measurements. Body length: 254 (holotype, female), 225, 229 (two paratypes, two males); notogaster width: 147 (holotype, female), 131, 135 (two paratypes, two males).

Integument ( Figure 4 ). Body color light yellow. Body surface densely microfoveolate, ventral side indistinctly and longitudinally striate (foveolae and stria visible only under high magnification in dissected specimens).

Prodorsum ( Figures 1 , 5 ). Rostrum slightly protruding (visible in anterior view), rounded. Lamellae of half of the prodorsum length (measured in lateral view). Prolamellae and sublamellae thin. Tutoria poorly developed. Rostral, lamellar, interlamellar (all 8–10) and exobothridial (4) setae setifrom, thin, smooth; in inserted on poorly developed longitudinal ridges. Bothridial setae (16; stalks in bothridia not considered) clavate, barbed. Anterior, posterior and lateral ridges on the lateral parts of prodorsum distinct.

Notogaster ( Figure 1–3 , 5 ). Ten pairs of notogastral setae (4) setiform, thin, smooth. Four pairs of rounded porose areas developed; Aa (8) little larger than A1, A2 and A3 (all 6). Lyrifissures, opisthonotal gland openings, circumgastric scissure and circumgastric sigillar scissure distinct.

Gnathosoma ( Figure 6–8 ). Subcapitulum longer than wide (53–57 × 82–86). Subcapitular (4–6) and adoral (2) setae setiform, thin, smooth. Palps (length 28–32) with typical setation 0–2–1–3–9(+ω). Postpalpal setae (2) spiniform, smooth. Chelicerae (length 57–61) with two setiform, barbed setae, cha (20–24) longer than chb (12–16). Trägårdh’s organ of chelicerae elongate triangular.

Epimeral and lateral podosomal regions ( Figure 4, 5 ). Epimeral setae setiform, thin, smooth; 1c (6– 8) longer and slightly thicker than 1a, 1b, 2a, 3a, 3b, 4a, 4b (4). Humeral porose areas Ah oval, poorly visible. Pedotecta II rounded distally in ventral view. Discidia roundly triangular. Circumpedal carinae long, directed to triangular custodia.

Anogenital region ( Figure 2, 3 , 4, 5 ). Three pairs of genital, two pairs of anal and three pairs of adanal setae (4) setiform, thin, smooth. Aggenital setae absent. Adanal lyrifissures located close and parallel to anal plates. Postanal porose areas narrowly elongate oval (32–36 × 4).

Legs ( Figure 9–12 ). Claw of each leg strong, smooth dorsally. Dorsoparaxial porose areas on femora I–IV and on trochanters III, IV poorly visible; ventral porose areas in basal parts of tarsi and distal parts of tibiae not visible. Formulas of leg setation and solenidia: I (1–5–2–4–17) [1–2–2], II (1–5–2–4–15) [1–1–2], III (2–3–0–3–15) [1–1–0], IV (1–2–1–3–12) [0–1–0]; homology of setae and solenidia indicated in Table 1 .

Material examined. New Zealand, North Island, Waipoua Forest, soil of kauri pine ( Agathis australis ) near a river, collected by E. Peñalver on 29 February 2008.

Type deposition. The holotype (female, in ethanol with drop of glycerol): Senckenberg Institute , Görlitz, Germany ; two paratypes (two males, in ethanol with drop of glycerol): Tyumen State University Museum of Zoology , Tyumen, Russia .

Etymology. The species is named in honor of the acarologist Dr. Antonio Arillo (Universidad Complutense de Madrid, Madrid, Spain), who provided the material for study to the authors.

Differential diagnosis. Angullozetes arilloi sp. nov. differs from the type species, Angullozetes rostratus Hammer, 1967 by the smaller body length (225–254 versus 360), number of notogastral porose areas (four versus three) and the absence of aggenital setae (versus present).

Distribution. At present, both known species of Angullozetes ( A. rostratus Hammer, 1967 and A. arilloi sp. nov.) are distributed only in New Zealand.

Revised generic diagnosis of Angullozetes 2

Adult. Prodorsum. Rostrum rounded. Lamellae of medium size, narrow, without cusps. Prolamellae, sublamellae and tutoria present. Translamella and sublamellar porose areas absent. Prodorsum with one pair of lateral ridges located between rostral setae and acetabula I. Rostral, lamellar, interlamellar and exobothridial setae very short, setiform. Bothridial setae clavate to globose, heads longer than stalks. Bothridia cup-like, covered completely by notogaster. Dorsosejugal porose areas present. Surface of prodorsum without heavily sculpturing and ornamentation. Notogaster. Anterior margin of notogaster not developed medially, posterior margin of notogaster rounded. Pteromorphs triangular, not movable. With three or four pairs of porose areas. Ten pairs of setae very short, setiform. Surface of notogaster without heavily sculpturing and ornamentation. Gnathosoma. Subcapitular setae setiform. Palps with setation 0–2–1– 3–9(+ω). Solenidion of palp tarsi bacilliform, attached to eupathidium. Chelicerae chelate-dentate, with two setiform setae. Lateral podosomal and epimeral regions. Humeral porose areas Ah present, Am absent. Pedotecta I and II represented by small laminae. Custodia, discidia and circumpedal carinae present. Epimeral setal formula: 3–1–2–2; setae 3c and 4c absent. Anogenital region. With three pairs of genital, two pairs of anal and three pairs of adanal setae; one pair of aggenital setae present or absent. Adanal lyrifissures located close and lateral to anal plates. Postanal porose area present. Surface without heavily sculpturing and ornamentation. Legs. Monodactylous. Solenidion φ 2 on tibiae I inserted on distinct apophysis. Leg tarsi I with 17 setae (pl’, pl” and l” absent). Juvenile instars. Not known.

Figures

Figures 1–3. Angullozetes arilloi sp. nov., adult: 1 – dorsal view; 2 – posterior view (part of right half not shown); 3 – posterior part of body, lateral view. Scale bar 50 µm.

Figures 4–8. Angullozetes arilloi sp. nov., adult: 4 – ventral view (gnathosoma and legs not shown); 5 – anterior part of body, lateral view (gnathosoma and legs not shown); 6 – subcapitulum, ventral view; 7 – palp, right, antiaxial view; 8 – chelicera, right, antiaxial view. Scale bar 50 µm (4, 5), 20 µm (6, 8), 10 µm (7).

Figures 9–12. Angullozetes arilloi sp. nov., adult: 9 – leg I, right, antiaxial view; 10 – trochanter, femur and genu of leg II, right, antiaxial view; 11 – trochanter, femur and genu of leg III, right, antiaxial view; 12 – leg IV, right, antiaxial view. Scale bar 20 µm.