Cryptococcus williamsi Kosztarab and Hale

Cryptococcus williamsi Kosztarab and Hale

Cryptococcus williamsi Kosztarab and Hale 1968: 7.

Specimens examined: UNITED STATES: Iowa: Story Co.: Ames, VI-14-1932, on soft maple (= Acer sp.?), H.E. Guthrie (25 ad. ♀♀, 1 first-instar nymph on 1 slide) USNM. Vermont: Caledonia Co.: XI-1-1966, on Acer sp., R.L. Murray (20 ad. ♀♀ on 15 slides) CDFA. CANADA: Ontario: Sault Ste. Marie, date (?), on (?), O.H. Lindquist (4 ad. ♀♀, 11 first-instar nymphs on 10 slides) USNM.

Etymology: The species epithet “ williamsi ” is named in honor of the famous coccidologist, Douglas J. Williams, of the Natural History Museum, London, UK (Miller & Watson 1995).

The adult female of this species was described in detail by Miller and Miller (1993) and information from that paper is not repeated here.

First-instar nymph (Fig. 33)

Description: Slide-mounted specimen 0.3 mm long, 0.2 mm wide. Body elongate oval, with slightly protruding anal lobe. Anal-lobe areas each dorsally with 1 pair of enlarged setae; each ventrally with 1 flagellate seta and anallobe seta.

Dorsum with flagellate setae arranged in 3 pairs of longitudinal lines (medial, mediolateral and lateral), longest seta on segment II 5–6 μm, on segment VII 8–10 μm. Enlarged setae present in cerarian arrangement on lateral areas of segments VI or VII to VIII. Macrotubular and microtubular ducts absent. Multilocular pores tubular, of 3 kinds: 3-locular pores most abundant, 4- and 5-locular pores rare or absent; pores arranged in 2 pairs of longitudinal lines on abdomen (mediolateral and lateral), also present on head. Microtrichia present on posterior abdominal segments.

Anal ring apical, normally poorly developed, without enlarged plate anteriorly and without pores. With 1 or 2 enlarged setae and 1 or 2 flagellate seta associated with ring but not situated on it. Anal tube weakly sclerotized, anal opening unsclerotized. Anal flap absent.

Venter with flagellate setae present over entire surface, longest seta on segment II 1–6 μm long and VII 5–8 μm long; anal-lobe seta 60–68 μm long. Enlarged seta on segment VIII near posterior apex of body. Macrotubular ducts and microtubular ducts absent. Multilocular pores tubular, of 3 kinds: 3-locular pores normally near base of posterior pairs of legs; 5-locular pores in 2 pairs of longitudinal lines on thorax and 1 pair on abdomen, 4-locular pores rare or absent, absent from head. Legs present; each femur with 1 seta; each tibia with 1 seta; tibia and tarsus either separate or fused; claw and tarsal digitules unusually long, apically capitate; claw without a denticle.Antennae each 5-segmented, about 60 μm long. Frontal lobes and preantennal pores absent. Microtrichia present on abdomen.

Notes: The description is based on five specimens from two localities. The first-instar nymphs of Cr. williamsi and Cr. fagisuga are similar; for a comparison of these species see the “Notes” section of Cr. fagisuga above.