Rutripalpidae Sokolow 1934
Creators: name: Gerecke, Reinhard
name: Tuzovskij, Petr
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Rutripalpidae

description: Rutripalpidae Sokolow, 1934   
 Diagnosis   
 Male. Integument of idiosoma soft, arrangement of glandularia and setae in agreement with the ground plan of Lebertioidea and Hygrobatoidea sensu Cook (1974) (idiosoma dorsal view ®gure 1, ventral view ®gure 2, chaetom formula: 2- 2-4-4-6-4-4-4-2-4-0, ®ve pairs of slit organs); lateral eyes with two lenses in a small eye capsule; glandularia with thick setae inserted above gland openings on small sclerites, subcutaneous portion of glands as large vesicles; neither a frontal eye, nor a frontal sclerite; ®ve pairs of dorsocentralia always well sclerotised, about six pairs of dorsolateralia sclerotised to diOEerent degree, sometimes only visible as small muscle attachment dots; coxal plates in paired anterior and posterior groups, Cxgl- 1 in the integument between Cx-2 and Cx-3, Cxgl- 2 in the integument posterior to Cx-4; accessory Cxgl in indentations near medial angles of Cx-4; legs (®gures 3±8) stout, with rosettes of strong distal setae on segments 3±5, claws I±III with ventral blade, claws IV stronger, but lacking ventral appendages; genital organ (®gures 12±14) consisting of an elongate, penis-like curved tube formed by the fused genital plates; the tip of this tube in erect position directed anteriorly, in recovered position ventroposteriorly, with the`penis’ tube embedded in a pit of the membranous integument; as can be observed in ®xed specimens, protrusion of this organ is induced by increased haemolymph pressure, accompanied by expansion of the normally folded integument posterior to the genital ®eld; the anterior part of this organ bearing a paired group of long, posteriorly directed setae; the distal part of the genital tube with three pairs of acetabula; the acetabula-bearing area of the organ ¯anked by a lateral collar diverging posteriorly and forming a pair of tips on the level of the acetabula 3; this collar, its surroundings and the caudal margin of the acetabular area bearing numerous spine-like short setae; between the acetabula, no longish gonopore visible, but a posteriorly directed tube originating medially from acetabula 3, probably made up from the fused gonopore lips, the whole genital organ protrusible like a penis due to a snap mechanism; genital skeleton (®gure 15) small, brachia proximalia and proximal horns reduced; excretory pore with a small semicircular anterior sclerite, one pair of large ventrolateral sclerites ¯anking the genital area; gnathosomal base short and stocky, chelicera (like ®gure 21) with dorsal projection near the proximal base of the basal segment and a short, hooklike claw; pedipalp (®gures 9, 10) without ventral projections, P-2 strongly thickened, P-4 very short, P-5 ¯attened and enlarged, in dorsal view with a lateral indentation, with four strong, nail-like claws arranged in two groups.   
 Female. As given for male; dorsocentral sclerites smaller and dorsolateralia never sclerotized (®gure 16); genital ®eld with a pair of ¯aps ¯anking three pairs of acetabula and the posterior half of the gonopore (®gures 17, 18) praegential plate prominent, pent- or hexangular; mouth parts as in males, but P-4 more slender and longish, P-5 without lateral indentation (®gures 19, 20).   
 Deutonymph. Similar to adult, but smaller in size and with lower numbers of pedipalp and leg setae and V2 (Pi) lacking glandularia; dorsalia lightly sclerotized, accessory glandularia not completely embedded in sclerotization of medial angles of Cx-4; genital ®eld with two pairs of acetabula embraced by halfmoon-shaped ¯aps (®gure 22); pedipalp with P-4 slender as described for females (®gure 23).   
 Larva. Idiosoma (®gures 25, 26) chaetom formula: 2-2-2-4-4-4-4-4-2-4-4, ®ve pairs of slit organs; dorsal plate bearing four pairs of setae (Lp1,2; Mp1,2); all setae Hu, Mh, Lh, slit organs, and lateral eye lenses (on two separate platelets, ®gure 27) arranged in the dorsal furrow; coxal plates clearly delineated by complete suture lines, urstigma round, anteriorly covered by hemispheric cap (®gure 28); Cx-3 with two pairs of setae (C4 anteriorly, V1 posteromedially), V2 separate in the ventroposterior membranous integument; excretory platelet trapezoidal, bearing two pairs of setae (®gure 29), membranous integument surrounding excretory plate bearing V3 (shifted to the dorsal region) and V4 setae; numbers and typology of leg setae (®gures 30±33): I-L-1±5: 1, 7, 6 (s,e), 11 (2s), 17(s, a,2e); II-L1±5: 1, 7, 6(s,e), 11(2s), 16 (s,a,e); III-L-1±5: 1, 6, 5(s), 10(s), 13; chelicera: ®gure 24; pedipalp (®gure 35) setae number and typology: P-1 ±5: 0, 1, 2, 3, 7 (s); P-4 bifurcate.
description: Published as part of Gerecke, Reinhard & Tuzovskij, Petr, 2001, The water mite Rutripalpus limicola Sokolow, 1934: new data on morphology and biology, and considerations on the systematic position of the monotypic family Rutripalpidae (Acari, Hydrachnidia), pp. 931-944 in Journal of Natural History 35 (6) on pages 933-934, DOI: 10.1080/00222930152123657, http://zenodo.org/record/5277107