Pennarhodeus pennatus Karg

Castilho, Raphael C., De, Gilberto J. & Halliday, Bruce, 2012, Revision of the genera Interrhodeus, Pennarhodeus and Poropodalius (Acari: Rhodacaridae), Zootaxa 3335, pp. 1-28 : 9-12

Pennarhodeus pennatus Karg

Pennarhodeus pennatus Karg, 2000a: 255 .

Pennarhodeus pennatus .— Karg, 2000b: 211.

Specimens examined. Holotype female: 6973 T, Kuba (= Cuba), 1975, Bodenpr . (soil sample) 8–9, ZMB Kat. Nr. 45980. Paratype male: 6974, Kuba (= Cuba), 1975, Bodenpr . (soil sample) 11, ZMB Kat. Nr. 45981. (in MNHB).

Diagnosis (adult female and male). Adult female and male with arthrodial process of chelicera with a short coronet-like fringe; epistome with antero-medial projection about 1.2 times as long as antero-lateral projections, and with margin smooth laterad to anterolateral extensions; podonotal shield mostly with roundish markings except for reticulate antero-lateral region, without scleronoduli; dorsal idiosomal setae pilose, except seta z1, smooth; opisthonotal shield reticulate; seta R5 present, inserted on unsclerotised integument outside lateral margins of opisthonotal shield; no accessory platelet between genital/ sternogenital and ventrianal shields; peritreme extending anteriorly to mid-level of coxa II. Adult female with genital shield smooth. Adult male with sternogenital shield lightly reticulate; with a spur-like ventral seta on each of femur, genu and tibia II.

Adult female ( Fig. 5 A–E) (holotype). Dorsal idiosomal setae (except z1), Jv5, para-anal and post-anal setae pilose; setae z1, hypostomal, subcapitular, ventral idiosomal (except Jv5, para-anal and post-anal) and leg setae smooth.

Gnathosoma. Fixed cheliceral digit 35 long; movable cheliceral digit 36 long; teeth and pilus dentilis not visible because of position of chelicera. Arthrodial process of chelicera with a short coronet-like fringe. Epistome with a smooth antero-medial projection of about uniform width and provided with five apical denticles, flanked on each side by a shorter, smooth projection with three apical denticles ( Fig. 5 A); margin of epistome with one or two denticles between antero-medial and antero-lateral projections, and smooth laterad to antero-lateral projections. Deutosternal denticles in eight transverse rows, each with eight to 12 denticles ( Fig. 5 B). With two pairs of rows of denticles outside of the deutosternal groove, slightly anterior to the sixth and to the seventh deutosternal denticle rows, respectively. Measurements of setae: h 1 11, h 2 8, h 3 9, sc 9.

Dorsal idiosoma ( Fig. 5 C). Podonotal shield mostly with roundish markings, except for reticulate antero-lateral region and a punctate band along posterior margin; 156 long and 161 wide at widest point; with 22 pairs of setae (setae r1 and r4 absent); without scleronoduli and with five pairs of distinguishable lyrifissures. Opisthonotal shield reticulate, except for a punctate band along anterior margin; 146 long and 145 wide at widest point; with 15 pairs of setae and four pairs of distinguishable lyrifissures. Unsclerotised integument laterad to opisthonotal shield with five pairs of setae (R1–R5). Measurements of setae: j1 13, j2 14, j3 12, j4 11, j5 12, j6 13, z1 13, z2 12, z3 12, z4 13, z5 12, z6 14, s1 10, s2 13, s3 13, s4 14, s5 13, s6 12, r2 14, r3 20, r5 14, r6 15, J1 17, J2 17, J3 not seen (broken), J4 17, J5 9, Z1 18, Z2 18, Z3 18, Z4 17, Z5 16, S1 16, S2 15, S3 16, S4 17, S5 15, R1 6, R2 7, R3 7, R4 8, R5 9.

Ventral idiosoma ( Fig. 5 D). Base of tritosternum 15 long and 10 wide proximally ( Fig. 5 E); laciniae 31 long, separated for about 90% of their total length, pilose. Sternal shield smooth and with indistinct anterior margin; region anterior to the first pair of lyrifissures (iv 1) lightly sclerotised and punctate; posterior margin straight; approximately 87 long, including the lightly sclerotised punctate region, 70 wide at widest point; with four pairs of setae and three pairs of lyrifissures. Genital shield smooth; slightly shorter than wide; extending posteriorly behind coxae IV; distance between st 5– st 5 37; posterior margin straight. Unsclerotised integument between genital and ventrianal shields with setae Jv1 and Zv1 and a pair of rounded metapodal plates. Ventrianal shield reticulate; 88 long and 121 wide at widest point, not fused to dorsal shield; with five pairs of setae (Jv2, Jv3, Jv5, Zv2 and Zv3) in addition to circum-anal setae and three pairs of distinguishable lyrifissures; post-anal seta longer than para-anal setae. Peritreme extending anteriorly to mid-level of coxa II. Peritrematal shield narrow, not extending beyond peritreme. Measurements of setae: st1 13, st2 14, st3 12, st4 13, st5 12, Jv1 11, Jv2 12, Jv3 not seen (broken), Jv5 11, Zv1 11, Zv2 12, Zv3 12, para-anal 15, post-anal 25.

Legs. Lengths: I: 242; II: 191; III: 161; IV: 232. Genu and tibia IV each with ten setae. Pretarsus I, a single, sessile, curved claw; pretarsi II-IV, an elongate ambulacral stalk, a pair of strong claws and three rounded pulvillar lobes.

Adult male ( Fig. 6 A–C) (paratype). Shape of setae as in adult female.

Gnathosoma. Fixed cheliceral digit 33 long; movable cheliceral digit 32 long; teeth and pilus dentilis not visible because of position of chelicera. Spermatodactyl 48 long, abruptly bent ventrally at an acute angle, tapering distally ( Fig. 6 A). Arthrodial process of chelicera with a short coronet-like fringe. Epistome, deutosternum and position of hypostomal setae as in female. Measurements of setae: h 1 15, h 2 8, h 3 11, sc 9.

Dorsal idiosoma. Podonotal shield mostly with roundish markings, except for reticulate antero-lateral region and a punctate band along posterior margin; 150 long and 162 wide at widest point; with 22 pairs of setae (setae r1 and r4 absent); without scleronoduli and with five pairs of distinguishable lyrifissures. Opisthonotal shield reticulate, except for a punctate band along anterior margin; 139 long and 146 wide at widest point; with 15 pairs of setae and four pairs of distinguishable lyrifissures. Unsclerotised integument laterad to opisthonotal shield with five pairs of setae (R1–R5). Measurements of setae: j1 12, j2 14, j3 11, j4 10, j5 12, j6 13, z1 12, z2 11, z3 11, z4 12, z5 13, z6 14, s1 9, s2 11, s3 12, s4 12, s5 13, s6 13, r2 12, r3 19, r5 12, r6 14, J1 16, J2 14, J3 15, J4 16, J5 10, Z1 16, Z2 17, Z3 17, Z4 16, Z5 14, S1 15, S2 14, S3 15, S4 15, S5 13, R1 7, R2 7, R3 7, R4 8, R5 9.

Ventral idiosoma ( Fig. 6 B). Base of tritosternum 13 long and 10 wide proximally; laciniae 30 long, separated for about 90% of their total length, pilose. Sternogenital shield lightly reticulate, with indistinct anterior margin, a small punctate region posterolaterad to seta st4 and a punctate band along straight posterior margin; region anterior to the first pair of lyrifissures (iv 1) lightly sclerotised and punctate; approximately 129 long, including the lightly sclerotised and punctate region, and 69 wide at widest point; with five pairs of setae and three pairs of lyrifissures; distance between st 5– st 5 22; genital opening on anterior margin of shield. Ventrianal shield reticulate, except for a punctate band along anterior margin; approximately 110 long and 126 wide at widest point, not fused to dorsal shield; with seven pairs of setae (Jv1, Jv3, Jv5 and Zv1–Zv3) in addition to circum-anal setae and two pairs of distinguishable lyrifissures; post-anal seta longer than para-anal setae. Peritreme extending anteriorly to mid-level of coxa II. Peritrematal shield narrow, not extending beyond peritreme. Measurements of setae: st1 11, st2 12, st3 11, st4 10, st5 10, Jv1 10, Jv2 not seen (broken), Jv3 12, Jv5 11, Zv1 9, Zv2 10, Zv3 10, para-anal 15, post-anal 21.

Legs. Lengths: I: 247; II: 171; III: 168; IV: 225. Leg chaetotaxy as in adult female. With a spur-like ventral seta on each of femur, genu and tibia II ( Fig. 6 C). Pretarsi as in adult female.

Remarks. This species was described on the basis of the adult female holotype, two adult female paratypes and two adult male paratypes. The following characteristics appear in the original description and illustrations of the species, but do not agree with our observations of the female holotype; podonotal shield ornamented only with roundish markings, with 24 pairs of setae and structures resembling scleronoduli (illustrated by Karg, 2000a, but not mentioned in the text); seta z1 pilose; opisthonotal shield imbricate; unsclerotised integument laterad to opisthonotal shield with three pairs of setae; genital shield longer than wide; peritrematal shield fused with a section of exopodal shield next to coxa IV; lyrifissures present only on sternal shield (three pairs). No information was provided about the tritosternum and leg setal counts. The measurements provided in the original description referred to the length of the idiosoma (280–300), width of idiosoma (130–140), length of setae j1 (cited as i1) (12), j5 (cited as i4) (10), r3 (cited as r5) (18), J1 (cited as I1) (17), J3 (cited as I3) (16), J5 (cited as I5) (14), Z5 (13), S5 (16), range of hypostomal setae (12–16), length of legs I (250), II (200), III (160) and IV (250).

For the adult male paratype, the only characteristics provided in the original description referred to details of the spermatodactyl and ventral setae of femur, genu and tibia II, as well as measurements for length (250–280) and width (140) of the idiosoma.

Figures

FIGURE 5. Pennarhodeus pennatus Karg. Female. A. Epistome; B. Hypostome; C. Dorsal idiosoma; D. Ventral idiosoma; E. Tritosternum. Lyrifissures enlarged for improved visibility.

FIGURE 6. Pennarhodeus pennatus Karg. Male. A. Lateral (antiaxial) view of spermatodactyl; B. Ventral idiosoma; C. Anterolateral view of femur, genu and tibia of leg II. Lyrifissures enlarged for improved visibility.