Kuzinellus rarotonga

Ma, Min, Fan, Qing-Hai & Zhang, Zhi-Qiang, 2019, Phytoseiid mites (Acari: Phytoseiidae) of the Cook Islands, Zootaxa 4646 (3), pp. 527-540: 534-537

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Kuzinellus rarotonga

sp. nov.

Kuzinellus rarotonga  sp. nov.

( Figures 4–6View FIGURE 4View FIGURE 5View FIGURE 6)

Diagnosis. Female: dorsal idiosomal shield reticulate or foveate-reticulate; bearing 19 pairs of setae, all marginal setae serrated; S4, Z4 and Z5 lanceolate. Sternal shield smooth, bearing two pairs of setae and three pairs of lyrifissures. Epigynal shield smooth. Peritremes extending forward to bases of j1. Ventrianal shield pentagonal, reticulated at marginal areas lateral to anus, bearing four pairs of pre-anal setae, solenostomes posteromedial to JV2. Calyx of spermathecal apparatus weakly sclerotised, atrium slightly expanded, major duct elongate and tubular. Cheliceral movable digit with one tooth, fixed digit with two teeth. Leg IV without obvious macrosetae.

Male: dorsal idiosomal shield and setal shapes similar to those in female, r3 and R1 on dorsal shield. Sternitigenital shield bearing five pairs of setae and three pairs of lyrifissures. Ventrianal shield triangular, anterior margin convex, reticulated at anterior marginal areas and areas lateral to anus, bearing six pairs of pre-anal setae. Cheliceral movable digit without teeth, spermatodactyl sword-like.

Description. Adult female (n =2).

Dorsal shield ( Fig. 4AView FIGURE 4) 303 (303–324) long, 164 (164–158) wide, strongly reticulated or foveate-reticulate bearing 19 pairs of setae, j5 and j6 smooth, other setae serrated, S4, Z4, Z5 lanceolate and barbed, Z5 longer than others. Dorsal shield with three pairs of discernible lyrifissures (is1, idl2 and idm5) and five pairs of discernible gland openings (gd1, gd2, gd4, gd5 and gd6). Anterior sublateral setae r3 barbed, posterior sublateral setae R1 smooth, on soft membranous cuticle, r3 at level of z4, R1 at level of shield incisions. Peritremes extending forward to bases of j1. Lengths of setae: j1 13 (12–13), j3 15 (13–15), j4 11 (10–11), j5 10 (10–11), j6 13 (13–15), z2 12, z3 12 (12–14), z4 13 (13–14), z5 12 (12–13), z6 15 (15–16), s4 13 (12–13), s6 15 (15–17), J2 14 (13–14), J5 12 (12–13), Z4 27 (25–27), Z5 34, S2 16, S4 19 (18–19), S5 26 (24–26), r3 13 (11–13), R1 8 (7–8).

Ventral idiosoma ( Fig. 4BView FIGURE 4). Sternal shield 70 (66–70) long and 57 (51–57) wide, smooth, anterior margin prominently convex, posterior margin medially slightly convex, bearing two pairs of smooth setae (st1, st2) and three pairs of lyrifissures (iv1, iv2 and iv3); setae st3 on cuticle, st4 and a pair of small lyrifissures on small platelets. Epigynal shield smooth, 89 (89–93) long, 51 (51–52) wide at level of setae st5. Lengths of setae: st1 20 (18–20), st2 16, st3 14 (12–14), st4 20 (17–20), st5 14 (13–14). Paragenital lyrifissures arranged close to edges of epigynal shield. A series of thin and long sclerites between genital and ventrianal shields. Ventrianal shield wider than epigynal shield, reticulated at marginal areas laterad of anus, with four pairs of pre-anal setae ( JV 1, JV2, JV3 and ZV 2), solenostomes posteromedial to JV2, a pair of muscle marks present between solenostomes. Four pairs of setae ( ZV 1, ZV3, JV4 and JV 5) and five pairs of lyrifissures on cuticle surrounding ventrianal shield. Setae JV5 smooth, slightly longer than others. Two pairs of metapodal platelets present on soft cuticle, primary metapodal platelet elongated, 36 (36–37) long, 3 wide, secondary platelet small, 6 long, 1 (1–2) wide. Calyx of spermathecal apparatus ( Fig. 4DView FIGURE 4) weakly sclerotised, major duct a long medially expanded tube, 44 (40–44) long, minor duct thin, thread-like, connecting to center of atrium.

Gnathosoma  . Chelicera ( Fig. 4CView FIGURE 4) with movable digit 22 (22–25) long, bearing one tooth, fixed digit 20 long, bearing two visible teeth, pilus dentilis 4 (4–5) long.

Legs ( Fig. 5View FIGURE 5) partially foveate-reticulate. Leg I 235 (223–235). Setal formula of Ge I 2-2 /2-2/1-1, including five stout and blunt setae; Ti I 2-2 /2-2/1-1, with four stout and blunt setae; Bt I without macroseta. Leg II 197 (197–203). Ge II 0-2/0-3/1-1, with three blunt setae; Ti II 1-1 /1-2/1-1, with three blunt macrosetae; Bt II 1 -0/0-1/1-1, with two blunt macrosetae. Leg III 188 (188–191). Ge III 1-1 /0-2/1-2, with two blunt setae; Ti III 1-1 /1-1/1-2, with one stout and blunt seta; Bt III 0-1/0-1/1-1, with three thick and blunt setae. Leg IV 168 (235–247). Ge IV 1-1 /0-2/1-2, with three thick and blunt setae; Ti IV 1-1 /0-1/1-2, with four thick and blunt setae; Bt IV 0-1/0-1/1-1, with two thick and blunt setae.

Male (n =1).

Dorsum. Dorsal shield ( Fig. 6AView FIGURE 6) oval, 249 long, 142 wide; shield reticulation and chaetotaxy as those in female but r3 and R1 on shield, bearing four pairs of discernible lyrifissures (id2, idm2, idm5 and idl4) and three pairs of discernible gland openings (gd2, gd5 and gd6); j3, j4, j5, j6, z2, z3, z4, z6, J2 smooth, other setae serrated. Peritremes reaching to bases of j1. Dorsal setae lengths: j1 12, j3 12, j4 10, j5 10, j6 10, z2 10, z3 12, z4 14, z5 9, z6 15, s4 10, s6 15, r3 10, J2 11, J5 9, Z4 18, Z5 27, S2 15, S4 14, S5 18 and R1 7.

Ventral idiosoma ( Fig. 6BView FIGURE 6). Sternitigenital shield 115 long and 49 wide, without reticulations, anterior margin moderately convex, posterior margin nearly straight, bearing five pairs of setae (st1, st2, st 3, st4 and st5) and three pairs of lyrifissures (iv1, iv2 and iv3); iv1 posterior to st1, iv2 between st2 and st3, iv3 closer to st4. Lengths of setae: st1 10, st2 7, st3 8, st4 9, st5 9. Ventrianal shield triangular, anterolaterally and posterolaterally reticulated, 95 long, 115 wide (at widest level), with three pairs of pre-anal setae ( JV 1, JV2 and JV 3) and three anal setae; solenostomes gv3 located posteromedial to JV2; one pair of lyrifissures present on posterolateral margin at level of ZV2; JV5 smooth and longer than others. Lengths of setae: JV1 6, JV2 6, JV3 5, JV5 11, ZV1 9, ZV2 5 and ZV3 6.

Gnathosoma  ( Fig. 6CView FIGURE 6). Spermatodactyl sword-like, fixed digit with two teeth.

Specimens examined. Holotype female and paratypes 1 female, 1 male, Papua stream, Rarotonga, Malvaceae  leaves, 26 October 2017, by Qing-Hai Fan.

Etymology. The species name rarotonga  is derived from its collection site, Rarotonga, as a noun in apposition.

Remarks. This new species is superficially similar to K. ecclesiasticus ( De Leon 1958)  , especially in that dorsal setae Z4 and Z5 are paddle-like. It can readily be distinguished from the latter by having most dorsal setae (except j5 and j6) serrated ( Fig. 4AView FIGURE 4); an elongated major duct and a weakly membranous calyx of thr spermathecal apparatus ( Fig. 4DView FIGURE 4).


Technical University