Edwardzetes elongatus Wallwork 1966
Creators: name: Ermilov, Sergey G.
name: Yurtaev, Andrey A.
name: Pešić, Vladimir
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Sarcoptiformes
Ceratozetidae
Edwardzetes
Edwardzetes elongatus

description: Edwardzetes elongatus Wallwork, 1966
(Figures 1–23)
Measurements. Body length: 830–1029 (three specimens: one female and two males); notogastral width (without pteromorphs): 398–498 (three specimens).
Integument. Body color light brown to dark brown. Body surface smooth, but prodorsum indistinctly punctate.
Prodorsum. Rostrum widely rounded. Lamellae shorter than half of prodorsum. Lamellar cusps without teeth. Translamella absent. Rostral (ro, 90–102), lamellar (le, 151–164) and interlamellar (in, 176– 205) setae simple, slightly barbed. Bothridial setae (ss, 40–48) clavate, with short stalk (12–20) and oval, rounded distally, indistinctly barbed head (28). Tutoria (tu) sable-like, long, curving downward, pointed. Exobothridial setae (ex, 41) thin, slightly barbed.
Notogaster. Anterior margin convex. Pteromorphs broadly rounded laterally. Dorsophragmata (D) of medium size, connected medially. Four pairs of oval porose areas present, with distinct borders: Aa (28–32 × 20–22) little larger than A1, A2 and A3 (16–24 × 12–16). Ten pairs of notogastral setae setiform, with short attenuate tips, thin, smooth; p 1 – p 3 (45–49) shorter than other seven pairs (65–69). Lyrifissures ia, im, ip, ih and ips distinct. Opisthonotal gland openings (gla) located laterally to A1.
Gnathosoma. Subcapitulum longer than wide (233–246 × 172–180). Subcapitular setae setiform, slightly barbed; a (36–41) shorter than h and m (both 53–57). Adoral setae and their alveoli absent. Palps (147) with setation 0–2–1–3–9(+ω). Solenidion attached to eupathidium, both located on dorsal tubercle. Chelicerae (266–287) with two simple, barbed setae; cha (102–106) longer than chb (45–49). Trägårdh’s organ (Tg) long, tapered.
Lateral podosomal and epimeral regions. Pedotecta I (Pd I) large, concave in dorsal view. Pedotecta II (Pd II) of medium size, triangular in ventral view. Both pedotecta scale-like in lateral view. Genal teeth (gt) elongate narrowly triangular. Apodemes 1, 2, sejugal and 3 distinctly developed, not fused medially. Epimeral setal formula 3–1–3–3. Epimeral setae setiform, thin, indistinctly or slightly barbed; setae 1b, 3b and 3c (61–73) longer than other (45–49). Custodia (cus) with long, thin, pointed tips. Discidia (dis) triangular. Circumpedal carinae (cp) distinct.
Anogenital region. Six pairs of genital (g 1 – g 6), one pair of aggenital (ag), two pairs of anal (an 1, an 2) and three pairs of adanal (ad 1 – ad 3) setae similar in length (36–41), simple, thin, indistinctly barbed. Lyrifissures iad located close to anal aperture, in inverse apoanal position. Ovipositor elongated (274 × 62), blades (106) shorter than length of distal section (beyond middle fold; 168). Each of three blades with four straight, smooth setae, ψ 1 ≈ τ 1 (53–57) longer than ψ 2 ≈ τa ≈ τb ≈ τc (24–28). Six coronal simple setae (k, 14– 16) present.
Legs. Medial claw smooth, clearly thicker than two laterals; claws serrate (ser) dorsally. Genua I and II, and femora II with large, triangular antero-ventral tooth (t). Formulae of leg setation and solenidia: I (1– 5–3–4–20) [1–2–2], II (1–5–3–4–16) [1–1–2], III (2–2–1–3–15) [1–1–0], IV (1–2–2–3–12) [0–1–0]; homology of setae and solenidia as indicated in Table 2. Solenidia setiform, thin, pointed. Famulus (ɛ) short, blunted. Setae (except p) slightly barbed.
Remarks. The specimens of E. elongatus from Tasmania show general conformity with the original description (Wallwork 1966) from the South Georgia Islands. However, detailed comparison of the Tasmanian specimens with those from the Starý collection revealed differences in the following characters:
1) Setae l” on genua II. These setae in the Tasmanian specimens were simple, slightly thickened versus thorn-like in specimens from South Georgia Island.
2) Morphology of rostral, lamellar and anogenital setae. These setae in the Tasmanian specimens were slightly barbed versus distinctly barbed in specimens from South Georgia.
In our opinion, the above listed differences are intraspecific and perhaps can be explained as population variation. Hence, this species of geographic variability could be seen in future identification of E. elongatus.
Distribution. Earlier, E. elongatus was registered in the Antarctic Islands (South Georgia and South Sandwich Islands) and South Chile (Wallwork 1966, 1967; Starý & Block 1995). Taking our record, geographical distribution of this species has expanded and includes now the Australian region (Tasmania) (see Fig. 23).
description: Published as part of Ermilov, Sergey G., Yurtaev, Andrey A. & Pešić, Vladimir, 2015, Additions to the Tasmanian oribatid mites, with supplementary description of Edwardzetes elongatus Wallwork, 1966 (Acari, Oribatida), pp. 98-108 in Ecologica Montenegrina 2 (2) on pages 104-106, DOI: 10.37828/em.2015.2.12, http://zenodo.org/record/8032028