Discourella pandui, Kontschán, Jen Ő, 2012

Kontschán, Jen Ő, 2012, New Uropodina mites from India (Acari: Mesostigmata), Zootaxa 3518, pp. 25-44: 40-43

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http://doi.org/ 10.5281/zenodo.210709

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Discourella pandui

sp. nov.

Discourella pandui  sp. nov.

( Figs 54–68View FIGURES 54 – 58View FIGURES 59 – 65View FIGURES 66 – 68)

Material examined. Holotype. Female. India, Berijam, Palni Hills, Tamil Nandu, Nature Reserve, extracted from litter of shola, 11 April 1980. Gy. Topál coll. Paratypes. One male and one female in MHNG, two females, two males, one nymph in HNHM. Locality and date same as in holotype.

Description. Female. Length of idiosoma 710–750 µm, width 430–450 µm (n= 4). Shape of body oval, caudally rounded.

Dorsal idiosoma ( Fig. 54View FIGURES 54 – 58). Dorsal and marginal shields fused anteriorly, all dorsal setae short (ca. 8–9 µm) and needle-like. Dorsal shield covered by shallow oval pits. Marginal shield anteriorly with two small, lateral horns, bearing setae similar in shape and length to dorsal setae, surface of marginal shield smooth. Caudal area of marginal shield with longer setae (ca. 19–20 µm) situated on small platelets ( Fig. 55View FIGURES 54 – 58).

Ventra l idiosoma ( Fig. 56View FIGURES 54 – 58). Surface of sternal shield smooth, except anterior area, which has a reticulate pattern ( Fig. 58View FIGURES 54 – 58). Five pairs of smooth and needle-like sternal setae present, St 1 short (ca. 9 µm), placed near anterior margin of genital shield, St 2 (ca. 11 µm) at level of posterior margin of coxae II, St 3 (ca. 11 µm) at central level of coxae III, St 4 (ca. 11 µm) at central level of coxae IV, St 5 (ca. 13 µm) near basal margin of genital shield. Ventral setae on anterior area of ventral shield smooth and robust (ca. 40 µm), those on caudal area of ventral shield needle-like (ca. 30 µm). Postanal seta absent, two pairs of adanal setae short and needlelike (ca. 11–12 µm). Surface of ventral shield covered by irregular pits, two strongly sclerotised ventral grooves situated posterior to pedofossae IV. Anal opening oval, located on a small anal mound. Pedofossae deep, their surface smooth, without separate furrows for tarsi IV. Genital shield linguliform, anteriorly with crown-like process, its surface with reticulate pattern ( Fig. 58View FIGURES 54 – 58). Stigmata situated between coxae II and III, post-stigmatal part of peritremes absent, pre-stigmatal area long, apically hook-shaped, with two short lateral branches on central part ( Fig. 57View FIGURES 54 – 58). Tritosternum with vase-like base, laciniae divided into three pilose branches ( Fig. 59View FIGURES 59 – 65).

Gnathosoma  ( Fig. 59View FIGURES 59 – 65). Hypostomal setae h 1 long (ca. 38 µm), smooth, h 2 (ca. 12 µm) and h 4 (ca. 11 µm) serrate, h 3 (ca. 16 µm) marginally pilose. Corniculi short and horn-like, internal malae longer than corniculi, marginally pilose. Epistome marginally pilose ( Fig. 60View FIGURES 59 – 65). Fixed digit of chelicera longer than movable digit and bearing one tooth, internal sclerotised node absent ( Fig. 61View FIGURES 59 – 65). Palp trochanter with two marginally serrate setae, other setae on palp smooth.

Legs. Each leg with ambulacral claws and with smooth and needle-like setae ( Figs 62–65View FIGURES 59 – 65).

Male. Length of idiosoma 740–780 µm, width 440–470 µm (n= 11). Shape and dorsal idiosoma as in female.

Ventral idiosoma ( Fig. 66View FIGURES 66 – 68). Surface of sternal shield smooth, five pairs of short (ca. 13–17 µm) and needle-like sternal setae present. St 1 placed at level of anterior margin of coxae II, St 2 at level of posterior margin of coxae II, St 3 at central level of coxae III, St 4 at central level of coxae IV, St 5 at level of posterior margin of coxae IV. Genital shield oval, without sculptural pattern and situated between coxae IV.

Gnathosoma  . As in female.

Deutonymph. Length of idiosoma 660 μm, width 440 μm (n = 1). Shape oval, posterior margin rounded.

Dorsal idiosoma ( Fig. 67View FIGURES 66 – 68). Dorsal shield linguliform, without ornamentation, only muscle scars visible, bearing short and needle-like setae (ca. 10–11 µm). Several oval platelets present on submarginal area, all of them bearing needle-like setae (ca. 12–13 µm).

Ventra l idiosoma ( Fig. 68View FIGURES 66 – 68). Sternal setae short (ca. 9–10 µm), St 1 placed near anterior margin of sternal shield, St 2 short, at level of posterior margin of coxae II, St 3 at central level of coxae III, St 4 at level of anterior margin of coxae IV, St 5 near posterior margin of sternal shield. Sternal shield with smooth surface. Ventrianal shield oval and ornamented by maculate sculptural pattern and bearing four pairs of needle-like setae (ca. 7 µm).

Etymology. I named the new species after king Pandu, father of Arjuna and four other sons in the Mahabharata.

Notes. The new species belongs to the Discourella baloghi  -species group ( Hirschmann 1972 a) on the basis of the following characters: marginal shield not reduced caudally, pygidial shield and central elevation absent on dorsal shield. Including the new species, 13 species currently belong to this group. Six species of this group ( D. baloghi Hirschmann & Zirngiebl-Nicol  , D. baloghisimilis WiŠniewski  , D. fissilis Hirschmann  , D. ditricha Hirschmann  , D. lindquisti Hiramatsu & Hirschmann  , D. hirschmanni Hiramatsu  and D. sivestrisa Hiramatsu  ) do not possess a crown-like apical process on the female genital shield, but the new one and six previously described species ( D. bulgarica Kontschán  , D. helvetica Kontschán  , D. crucisimilis Hirschmann  , D. aokii Hiramatsu  , D. torpida Hiramatsu & Hirschmann  and D. koreae Hirschmann  ) do have this apical process. One species is described on the basis of males ( D. morikawai Hiramatsu  ), this species has ornamented sternal shield, but sternal shield of the male of new one is smooth. The characteristic differences among the species possessing crown-like apical process on female genital shield are presented in Table 4.

The six new species described here belong to several different genera and species groups. Only two species groups show characteristic zoogeographical pattern. The Uropoda penicilla  -group with seven species has an amphi-pacific distribution, two species of this group ( U. penicillata  and U. penicillatasimilis  ) were described from South and Central America ( WiŠniewski 1993), but the other five species ( U. complicata  , U. garciai  , U. indonesiensis  , U. micherdzinksii  and U. bengalica  ) were recorded from South-East Asia (Java, Philippines, Indonesia and Vietnam) and India. All species of the Uropoda gibba  -group occur in South-East Asia ( Japan, Vietnam, New Guinea) and India, and it is possible that this group is endemic to this area of the world ( WiŠniewski 1993; Kontschán & Starý 2011).

The other four species described here belong to species groups or subgenera occuring in many areas of the world (Europe, South-East Asia, North- and South America) ( WiŠniewski 1993), and do not show any characteristic distribution pattern. The Gondwanan origin of India suggests that uropodine genera or subgenera with a Gondwanan origin would be expected in the studied soil samples. Instead most of the described here probably originated in Laurasia and dispersed into the subcontinent after the fusion of India with Asia, similar to species of Angulobaloghia (Kontschán 2011).

TABLE 4. Characteristic differences among the species possessing crown-like apical process on female genital shield in the Discourella baloghi - group.

      D. crucisimilis    D. koreae     
  laterally reticulate, centrally with oval pits            

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Hungarian Natural History Museum (Termeszettudomanyi Muzeum)