Sperchon squamosus Kramer 1879

• Main Author: Martin, Peter
• Format: Text
• Language: unknown
• Published: Zenodo 2006
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Arachnida; Trombidiformes; Sperchonidae; Sperchon; Sperchon squamosus; Kramer; Seta; Iceland
• Online Access: https://dx.doi.org/10.5281/zenodo.5679277; https://zenodo.org/record/5679277

Sperchon squamosus Kramer, 1879 Records (Table 2): Benthos samples at ten spring sites in Gutland and in Ösling, 48 individuals (Gerecke et al. 2005). E 2 58 larvae, E 3 93 larvae, E 5 1 larva, parasitic on chironomids. Attribution based on individuals reared from a female from a small lowland stream in the German lowlands (Himmelreichbach, see Martin 1997). Descriptions of larvae: Lundblad (1927), MotaŞ (1961), Ullrich (1976). Description (n = 5, Himmelreichbach): Idiosoma ovate; in non­engorged specimens and to a lesser extent in slightly engorged specimens with distinct distal indentation (Figs. 28, 29). Length/width of idiosoma 234–261 (251)/ 174–198 (187). Dorsal idiosoma (Fig. 28): Dp relatively large and ovate, anteriorly and medially with a fine lineation, the lines meeting each other laterally and posteriorly and building almost a rhombic pattern. Length/width Dp 202–245 (230)/ 153–168 (161), length eye capsule 36– 43 (39), Mp 2 ­Amdp 49–57 (53), Mp 1 ­Mp 1 55–62 (60), Mp 2 ­Mp 2 48–58 (53), Lp 1 ­Lp 1 34–40 (37), Lp 2 ­Lp 2 100–106 (103), Mp 1 ­Lp 1 11–14 (12), Mp 2 ­Lp 2 33–36 (34), Mp 1 ­ Mp 2 37–40 (39), Lp 1 ­Lp 2 40–42 (41), Mp 1 25–32 (28), Mp 2 20–35 (26), Lp 1 72–96 (87), Lp 2 140–150 (146), Hu 120–140 (134), Mh 1 118–150 (141), Mh 2 105–140 (127), Mh 3 103–113 (109), Mh 4 78–103 (94), Lh 1 128–140 (134), Lh 2 108–118 (114), Lh 3 85–105 (92). Ventral idiosoma (Fig. 29): Length/width CX­I 88–93 (91)/ 38–45 (42), CX­II 75–93 (85)/ 58–65 (61), CX­III 133–150 (143)/ 88–98 (93), coxal plates with an alveolar pattern, between the median margins of the coxal plates III, one or two small sclerites, urstigmata rounded, C 1 ­C 2 53–57 (55), C 1 ­Mmcp 20–25 (23), C 4 ­Pmcp 105–132 (144), C 1 ­C 4 40– 55 (48), C 1 55–65 (60), C 2 82–105 (90), C 3 80–89 (83), C 4 74–94 (81), Expp relative large and pronounced, length/width 20–22 (21)/ 19–22 (21), E 1 ­ E 1 8 –11 (9), E 2 ­ E 2 15 –19 (16), E 1 ­ E 2 11 –14 (13), E 1 15 –22 (18), E 2 21 –42 (26), V 1 59 –68 (63), V 2 62 –76 (68), V 3 80 –92 (86), V 4 85 –94 (90). Gnathosoma: Base (n= 4) 90–97 (95), length chelicera (Fig. 30) (n= 3) 83–87 (85), chela 14–16 (15), length/width P 2 28–40 (36)/ 28–30 (29), P 3 30–35 (32)/ 26–29 (27), claw (n= 4) 12–18 (15), palpal seta C 3 82–105 (98), C 4 57–72 (63), C 5 67–79 (73), lateral seta 79–90 (86). Legs: First segments with a little pronounced transverse lineation, some of the other segments slightly lineated. Leg I (Fig. 31): Total length (n= 5) 276–300 (289), length/height I­L 1 35–38 (36)/ 29– 30 (30), I­L 2 43–48 (46)/ 30–31 (31), I­L 3 56–60 (59)/ 25–28 (26), I­L 4 66–72 (70)/ 24–25 (25), I­L 5 76–82 (78)/ 19–20 (20). Leg II (Fig. 32): Total length 311–326 (319), length/height II­L 1 44–46 (45)/ 28–30 (29), II­L 2 49–51 (50)/ 29–30 (30), II­L 3 61–63 (62)/ 25–27 (26), II­L 4 75–82 (79)/ 24–28 (25), II­L 5 82–84 (83)/ 19–20 (20). Leg III (Fig. 33): Total length 376–436 (418), length/width III­L 1 72–75 (74)/ 29–31 (30), III­L 2 63–68 (66)/ 27–30 (28), III­L 3 85–91 (89)/ 22–24 (23), III­L 4 104–108 (106)/ 22–24 (23), III­L 5 52–94 (83)/ 17–18 (18). Diagnostic characters of larvae: Structure of the Dp (laterally and posteriorly with a rhombic pattern). Remarks: Previous descriptions of Sperchon squamosus often lack measurement data and/or accurate illustrations. : Published as part of Martin, Peter, 2006, On the morphology and classification of larval water mites (Hydrachnidia, Acari) from springs in Luxembourg, pp. 1-44 in Zootaxa 1138 on pages 17-18, DOI: 10.5281/zenodo.172007 : {"references": ["Gerecke, R., Stoch, F., Meisch, C. & Schrankel, I. (2005) Die Fauna der Quellen und des hyporheischen Interstitials in Luxemburg. Unter besonderer Berucksichtigung der Acari, Ostracoda und Copepoda. Ferrantia - Travaux scientifiques du Musee national d'histoire naturelle, Luxembourg, 41, 1 - 134.", "Martin, P. (1997) Zur Faunistik und Substratpraferenz der Wassermilben (Hydrachnidia, Acari) zweier durch feine mineralische Substrate gepragten Bache in Schleswig-Holstein. Faunistisch-Okologische Mitteilungen, 7, 221 - 237.", "Lundblad, O. (1927) Die Hydracarinen Schwedens. I. Beitrag zur Systematik, Embryologie, Okologie und Verbreitungsgeschichte der schwedischen Arten. Zoologiska bidrag, 11, 185 - 540.", "Motas, C. (1961) Hydrachnellae. The Zoology of Iceland, 3, 1 - 26.", "Ullrich, F. (1976) Biologisch-okologische Studien an rheophilen Wassermilben (Hydrachnellae, Acari), unter besonderer Berucksichtigung von Sperchon setiger (Thor 1898). PhD thesis, University of Kiel, 241 pp."]}