Arrenurus (Brevicaudaturus) imperator imperator Lundblad, 1944

Ferradás, Rosso & Beatriz, 2006, New species and records of Arrenurus from the Paraná river, Argentina (Acari: Parasitengona: Arrenuridae), Zootaxa 1208, pp. 25-35 : 30

Arrenurus (Brevicaudaturus) imperator imperator Lundblad, 1944

Arrenurus (?s. str.) imperator Lundblad, 1944: 31 ; type area: Villarrica, Paraguay; Münchberg, 1960: 435; Cook, 1980: 336; Viets, K. O., 1987: 71; Arrenurus (Brevicaudaturus) imperator imperator Smit, 1997: 253 ; Rosso de Ferradás & Fernández, 2005: 191.

Description

Females (holotype, Präp.2623): the dorsal and ventral views are presented in Figs. 7 and 8 . The pores of the integument are remarkably large and of unequal sizes; length of the dorsal shield 1146; width 1166; length between the anterior end of the Cx­I and the posterior border of Cx­IV: 1073; in Cx­III and IV different longitudinal sclerotic lines have been observed; width between the articular apophysis of the IV­Leg: 1645; genital field 1229 in width; genital valves, 174 in length and 174 in width; arrays of small short hairs are located on the borders of the genital field ( Fig. 8 ); palpi match Lundblad’s illustrations and in addition in the P­II disto­dorsal region, each palp has 3 simple hairs, and in P­III region, two long simple hairs ( Fig. 11 ). Dorsal lengths of the distal segments of the first leg: I­Leg­4, 308; I­Leg­5, 390; I­Leg­6, 473 ( Fig. 9 ); dorsal lengths of the distal segments of fourth leg: IV­Leg­5, 349; IV­Leg­6, 349 ( Fig. 10 ); I­Leg­4 with 16 swimming hairs (s.h.); I­Leg­5 with 15 s.h.; III­Leg­4 and 5 with more than 25 s.h.; IV­ Leg­5 with more than 15 s.h..

Comments

Several morphometric aspects aren’t included in the descriptions of A. imperator ; these are mentioned above. In the Holotype, the legs are articulated in the body and somewhat folded, which is why IV­Leg could not be visualized correctly and the measurements of the segments were considered approximately (not included in the description); on the other hand, due to thickness of the slide (well preserved, but in a thick fixed preparation), it was impossible to use great magnification (objective­plate distance) to observe in detail small structures.

Figures

FIGURES 7 – 11. Arrenurus i. imperator Lundblad, female, 7, dorsal view (scale line = 114 µm); 8, ventral view (scale line = 114 µm); 9, I­leg­ 4 ­ 6 (scale line = 60 µm); 10, IV­leg­ 5 ­ 6; 11, lateral view of palp (scale line = 60 µm).