Spadiseius Lindquist & Moraza
Creators: name: De Moraes, Gilberto J.
name: Britto, Erika P. J.
name: Mineiro, Jefferson L. De C.
name: Halliday, Bruce
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Mesostigmata
Ascidae
Spadiseius

description: Spadiseius Lindquist & Moraza
FEMALE
Gnathosoma. Anterior margin of epistome triangular, pointed or narrowly rounded apically, smooth or slightly denticulate. Seta h3 longer than h1, h2 and pc; insertion of h2 slightly anterior to or about in transverse line with insertion of h3. Inner palp trochanter seta about as long as outer seta, not elongate. Deutosternum moderately wide, with delimiting lateral lines and with 7–8 equally spaced rows of 7–15 denticles each. Corniculi about twice as long as their basal widths, with pointed tips, close to each other, slightly to strongly convergent distally. Palp tarsal apotele two-tined. Fixed cheliceral digit with 3–4 teeth in addition to apical tooth and pointed membranous lobe instead of setiform pilus dentilis; movable digit with 1–2 small teeth in addition to apical tooth, with ventral mucro near base.
Idiosoma. Ovoid. Dorsum: podonotal and opisthonotal shields fused, ornamented, without lateral incisions at region of fusion, transverse and nearly straight lines or delineated strip along lateral margins; dorsal shield not strongly deflexed. A variable number of supernumerary setae on dorsal shield. Podonotal region of shield with approximately 25–27 pairs of setae, including r3, which is similar to neighbouring setae, and a variable number of unpaired setae. Opisthonotal region of shield with15–17 pairs of setae and a variable number of unpaired setae. Unsclerotised lateral cuticle with 5–12 pairs of setae, including some UR setae. Dorsal and lateral setae of idiosoma shorter than distance to subsequent setae, mostly acicular (sometimes slightly knobbed at base, or untapered and rod-shaped) and smooth. Vent er: presternal platelets indistinct. Sternal shield usually with three pairs of setae of similar lengths (st1–st3; the latter often inserted on unsclerotised area); st2 slightly closer to st3 than to st1; posterior shield margin slightly concave. Third pair of sternal lyrifissures (iv3) and st4 inserted on unsclerotised cuticle. Genital shield not wide enough to include iv5 or st5 (the latter inserted very close to margin of genital shield); broad anterior hyaline region convex, extending to level of iv3 but usually not overlapping posterior margin of sternal shield; posterior region convex. One or two pairs of metapodal plates, the smallest difficult to discern. One or two pairs of platelets between genital and anal shields. Opisthogaster usually with 8–10 pairs of setae on unsclerotised cuticle, in addition to circumanal setae; anal shield relatively small, oval (longer axis longitudinal) or nearly inversely subtriangular; para-anal setae inserted at level of mid-length of anal opening, about as long as post-anal seta. Anal opening not enlarged, about 1/4 of shield length, near shield centre. Anterior section of endopodal shield fused with sternal shield; section behind sternal shield indistinct or reduced to weakly sclerotised, arched platelet between coxae III–IV. Exopodal shield weakly sclerotised, extending along coxae II–IV and beyond posterior margin of coxa IV.
Peritreme. Extending from stigma to region between levels of s1 and s3, about as wide as diameter of stigma. Peritrematic shield anteriorly of different width, broadly fused with dorsal shield at level between s1 and s2; not clearly discernible behind stigma.
Legs. Setation of legs I–IV, genu: 13, 11, 9, 9 (or 10); tibia: 13 (or 12), 10, 8, 10. Leg II not distinctly different from other legs. Legs without macrosetae. Femora I–IV with dorsal seta ad1 thickened, less tapered than adjacent setae, usually progressively longer from legs I to IV, oar-shaped on femur IV and sometimes on femora I–III. Spermathecal apparatus. Without sclerotised structures.
MALE
Epistome similar to female, corniculi more widely spaced and more convergent distally than in female; fixed cheliceral digit with 3–4 teeth of different sizes and movable digit edentate, without ventral mucro; spermatodactyl about as long or twice as long as movable digit, directed forward, variously shaped. Dorsal shield broader than female, including a larger number of r - R setae; ornamentation variable and different from female, usually with several setae inserted on tubercles or wart-shaped thickenings; dorsal shield setae highly dimorphic, with those in central region of the shield either very short, simple and sometimes inserted on wart-shaped thickenings, or moderately short and thickened, blade-shaped, while some of the most peripheral setae enlarged, of variable lengths, and either attenuated or with thick shafts and capitate or clavate apices, many of which inserted on tubercles. With 0–1 pairs of presternal platelets. Sternogenital shield with five pairs of setae (st1–st5; four pairs when the shield is posterolaterally narrowed, leaving st5 on unsclerotised cuticle) and three pairs of lyrifissures (iv1– iv3); st4 and st5 distinctly longer than st1–st3; posterior margin convex or irregularly bilobed. Endopodal shield fused with sternogenital shield, except for discrete section beside coxa IV. Metapodal plates absent. Opisthogaster with 8–9 pairs of setae, of which 6–7 pairs on weakly sclerotised, subtriangular ventrianal shield, which is not fused with surrounding shields. Leg setation as in female, but shapes of several setae different from female.
description: Published as part of De Moraes, Gilberto J., Britto, Erika P. J., Mineiro, Jefferson L. De C. & Halliday, Bruce, 2016, Catalogue of the mite families Ascidae Voigts & Oudemans, Blattisociidae Garman and Melicharidae Hirschmann (Acari: Mesostigmata), pp. 1-299 in Zootaxa 4112 (1) on pages 55-56, DOI: 10.11646/zootaxa.4112.1.1, http://zenodo.org/record/399477