| abstract | Ctenoglyphus myospalacis, sp. nov.
Female (Figs. 1, 2): Body 380µ long and 230µ wide. All peripheral setae bipectinate, with 5-12 barbs on each side of shaft. These barbs either smooth or having 1-2 branches toward the tip of the setae. The v.e. located in front of v.i. comparatively short and broad. d3 being the longest of the dorsal setae, about twice as long as Sc.
End of the sensory rods of the tarsus I and II slightly enlarged. Tibia I and IIwith one simple seta, which is longer than the tarsus.
Male (Figs. 3, 4): Body 270µ long and 210µ wide. Chaetotaxy similar to that of the female, but the peripheral setae somewhat medial, without branches on the barbs.
Legs resembling those of the female, but the first 2 pairs comparatively stronger.
Holotype (♀), allotype (?) and paratypes (10♀♀, 10♂♂) were collected in May-June, 1962 from the nests of Myospalax aspalax (Pallas) in Kirin Province.
Hirstionyssus pontiger, sp. nov.
Female (Fig. 5): Body oval, 900-1040µ long (gnathosoma not included) and 500-550µ wide.
Dorsal plate oval, with a rounded tip and 26 pairs of dorsal setae.
Sternal plate rectangular. The anterior and lateral portion of this plate hihgly chitinized, giving a bridge-like appearance, hence the name. End of genitoventral plate bluntly pointed, twice as long as wide. Coxal spurs: 0-1-2-0.
Male (Fig. 6): Body length 650-1030µ, elliptical.
Dorsal plate oval, with broadly rounded end. Chaetotaxy as in female.
Holoventral plate undivided, slightly narrowed between coxa IV and slightly expanded just behind the last coxae. There are 8 paired and 1 unpaired setae on this plate. Uncovered ventral body surface with about 30 pairs of setae.
Legs very strong. Tarsus III and IV with 2 pairs of modified setae, the distal halves of these setae abruptly thinned and screwed. Coxal spurs: 0-1-2-1.
Holotype (♀), allotype (♂) and paratypes (12♀♀, 10♂♂) were collected in May-June, 1962 from the body and nest of the Myospalax aspalax (Pallas) in Kirin Province.
This new species is allied to Hirstionyssus myospalacis Zemskaja et Piontkovskaja, 1957, but is distinguished from the latter by the following characters: (1) The characteristic sternal plate; (2) posterior end of the dorsal plate bluntly rounded in both sexes;(3) genito-ventral plate with a tapering end; (4) holoventral plate only slightly widened behind the last coxae; (5) uncovered ventral surface of the male with about 32 pairs of setae.
Hirstionyssus ventricosus, sp. nov.
Female (Figs. 7, 10): Large mites, 1650-2150µ long (gnathosoma not included)and 900-1350µ wide, venter in most case large, thus the name.
Dorsal plate small, greater part of posterior and lateral dorsal surface uncovered, from S7-8 abruptly narrowed to form a tail. Sternal plate rectangular, twice as wide as long, anterior margin slightly concave, posterior margin convex. Genitoventral plate small, tongue-like, Anal plate widely separated from the genitoventral plate.
Legs exceedingly strong. Leg II stoutest and shortest. Dorsal side of Femur I and II with a pair of long smooth setae. One such seta arises from the genu I and II as well, but slightly shorter. Tarsus II with 3 stout setae in the middle. Tarsus III and IV with 5 stout setae ventrally. Coxal spurs: 0-1-2-0.
Male (Figs. 8, 9, 11): Body oval, 1300-1450µ long by 800-950µ wide.
Dorsal plate covering almost entire dorsum, with 26 pairs of setae.
Holoventral plate undivided, not enlarged behind the last coxae but narrowing thereafter progressively to a neck connecting with the anal part. There are 9 paired and 1 unpaired setae on this plate.
Legs I and II as in the female. There are 2 pairs of modified setae arising from tarsus III and IV subapically. These modified setae are screwed in their distal halves. Coxal spurs: 0-1-2-1.
Deutonymph (Fig. 12): Body oval, 1100-1200µ long and 650-750µ wide.
Dorsal plate covering almost entire dorsum. Sternal plate fused with genitoventral plate, anterior margin straight, anterior angle truncate, the width of plate decreasing towards the tapering posterior end. There are 3 pairs of simple setae on this plate. Anal plate elongated and oval.
Legs as in the female, but no modified setae arising from the tarsus.
Coxal spurs: 0-2-2-0.
Holotype (♀), allotype (♂, deutonymph) and paratypes (10♀♀, 10♂♂, 10 deutonymphs) were collected in May-June, 1962 from Myospalax aspalax (Pallas) and its nest in Kirin Province.
This new species is allied to Hirstionyssus georgicus Bregetova, 1956, but is distinguished from the latter by the following characters: (1) Body very large (excluding gnathosome longer than 1000µ); (2) the venter of female extremely expanded; (3) the posterior margin of sternal plate slightly concave; (4) genitoventral plate smaller, without enlargement; (5) femur I, II and genu I, II of both sexes with characteristic long setae; (6) dorsal plate of male covering almost entire dorsum.
All the type-specimens are deposited in the Department of Biology, Kirin Medical College, Chang-chun, Kirin Province, China |