Castriidinychus tasmanicus, Dylewska & Błoszyk & Halliday, 2010

Dylewska, M., Błoszyk, J. & Halliday, R. B., 2010, Three new species of mites in the genus Castriidinychus Hirschmann from Tasmania (Acari: Uropodidae), Zootaxa 2546 (1), pp. 1-30 : 3-12

publication ID 10.11646/zootaxa.2546.1.1

persistent identifier

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scientific name

Castriidinychus tasmanicus

sp. nov.

Castriidinychus tasmanicus sp. nov.

Material examined. Tasmania. Holotype. Female, Savage River, Pipeline Road , site 2, litter, 41°30'S 145°20'E, 21.iv.89, P. Greenslade and J. Diggle coll., TAS-086 (in ANIC) GoogleMaps . Paratypes. Tasmania. 2 females, 4 males, same data as holotype GoogleMaps ; 1 female, Savage River, Pipeline Road , site 1, moss on dead trunk, 41°30'S 145°20'E, 21.iv.89, J. Diggle and H. Mitchell coll., TAS-077 GoogleMaps ; 1 female, 3 males, 3 DN, Savage River, Pipeline Road , site 2, moss on log, 41°30'S 145°20'E, 21.iv.89, J. Diggle and H. Mitchell coll., TAS-085 GoogleMaps ; 1 female, Spero River , litter, 42°38'S 145°22'E, 23.ii.89, J. Marsden-Smedley coll., TAS-054 GoogleMaps ; 2 females, Hibbs Lagoon , litter, 42°34'S 145°19'E, 27.ii.89, S. Smith coll., TAS-058 GoogleMaps ; 1 female, Mount Horror , litter, 41°04'S 147°44'E, -.xii.88, M. Neyland coll., TAS-072 GoogleMaps ; 2 females, 2 males, Bradshaws Road, below Mount Murchison, Loftus Hill Memorial Reserve , site 2, litter, 41°50'S 145°37'E, 21.iv.89, J. Diggle coll., TAS-101 GoogleMaps ; 1 male, Bradshaws Road, below Mount Murchison, Loftus Hill Memorial Reserve , site 2, fungi sample, 41°50'S 145°37'E, 21.iv.89, J. Diggle and H. Mitchell coll., TAS-214 GoogleMaps ; 1 female, Simons Road , soil cores, 41°21'S 147°31'E, 5.v.89, P. Greenslade coll., TAS-168 GoogleMaps ; 1 female, Big Sassy Creek , 21 km NNW of Little Swanport, site 1, litter, 42°09'S 147°55'E, 12.v.89, P. Greenslade coll., TAS-193 GoogleMaps ; 2 females, 3 males, Mount Michael , leaf litter, 148º00'E 41º10'S, 20.ix.89, H. Mitchell coll., TASII/6 GoogleMaps ; 3 females, 4 males, Cradle Mountain , camping ground, in moss, 145º55'E 41º35'S, 18.ix.89, R GoogleMaps . Coy coll., TASII/7 (in ANIC and AMU).

Female. Dorsal idiosoma ( Figs 1 View FIGURE 1 , 2 View FIGURE 2 , 3 View FIGURE 3 ). Length 438–600 µm (mean 534 µm), width 261–385 µm (mean 341 µm) (n = 13). Dorsal shield oval, with small rounded vertex and characteristic ornamentation of large oval or irregular pits ( Fig. 3C View FIGURE 3 ). Dorsal shield setae numerous, uniform in length and shape, smooth, basally swollen, length 32–40 µm, except one pair of vertical setae j1 long (50 µm) and distally serrated, and two posterior pairs Z4, J4 finely serrated, length 25–49 µm, inserted on small mounds ( Fig. 1 View FIGURE 1 , 3B View FIGURE 3 ). Marginal shield narrow, with festoons, clearly demarcated from dorsal shield. Four pairs of anterior setae on marginal shield (z1, s2, r2, r3) much longer (37–57 µm), distally serrated; lateral and posterior setae on marginal shield shorter, smooth.

Ventral idiosoma ( Figs 4 View FIGURE 4 , 5A View FIGURE 5 , 6 View FIGURE 6 , 7A, 7B View FIGURE 7 ). Tritosternum with narrow base and four forked laciniae. Sternal shield ornamented with oval-shaped pits, with four pairs of simple sternal setae, st1 shortest, inserted at anterior level of coxae II, st2-st4 lateral to epigynal shield. Epigynal shield tongue-shaped, posterior margin at level of coxae IV, central area ornamented with oval-shaped pits. Length of epigynal shield 118–137 µm (mean 126 µm) width 69–86 µm (mean 77 µm) (n = 13). Ventral opisthosoma ornamented with oval-shaped pits, with six pairs of smooth ventri-anal setae, posterior pair longest (42 µm), one postero-lateral pair minute. Anus flanked by two pairs of adanal setae, Ad1 shorter than Ad2, and long smooth post-anal seta Pa, anal opening small, oval. Submarginal ventral setae smooth, short and massive. Peritreme distinctively shaped, highly convoluted, stigmata at level of coxa II ( Figs 4 View FIGURE 4 , 6C View FIGURE 6 ).

Gnathosoma ( Fig. 8A View FIGURE 8 ). Hypostomal setae h1 long (28 µm) and smooth, h2 slightly shorter (15 µm), simple, h3 longest (33 µm), medially serrated, h4 short (12 µm), distally serrated. Ventral setae on palp trochanter long and serrated.

Legs. Leg chaetotaxy as in Figure 9 View FIGURE 9 . All leg setae smooth and pointed. Some dorsal and lateral setae on tarsus I, II, III thick and spine-like.

Male. Dorsal idiosoma. Length 531–615 µm (mean 570 µm), width 377–400 µm (mean 357 µm) (n = 7). Structure and chaetotaxy as for female.

Ventral idiosoma ( Fig. 10 View FIGURE 10 , 7C, 7D View FIGURE 7 ). Intercoxal region ornamented with a few oval-shaped pits, with five pairs of simple setae ( Fig. 7D View FIGURE 7 ), st4-st5 inserted lateral to genital operculum. Genital operculum oval, smooth (45–69 x 33–39 µm), without setae, slightly displaced posteriorly to between coxae IV. Setae and sculpture of opisthosoma as for female.

Gnathosoma . Surface of hypostome smooth except for two longitudinal rows of tiny denticles ( Fig. 8B View FIGURE 8 ). Hypostomal setae h1 more massive than others, 18 µm long, h2 shorter than h1 (12 µm), simple, h3 longest (20 µm), simple, h4 short (15 µm), serrated. Legs. As for female.

Deutonymph. Dorsal idiosoma ( Fig. 11A View FIGURE 11 ). Length 470 µm, width 310 µm. Dorsal shield with numerous setae and characteristic ornamentation of irregular pits; marginal shield narrow.

Ventral idiosoma ( Fig. 11B View FIGURE 11 ). Sternal shield elongate, strongly narrowed between coxae IV; smooth except for small oval and circular pits posterior to coxae IV; with five pairs of simple setae and two pairs of lyrifissures. Peritrematal, metapodal and pericoxal shields fused; metapodal region ornamented with circular pits. Ventri-anal shield trapezoidal, ornamented with small pits, with six pairs of ventral setae, one pair of adanal setae (Ad) and unpaired post-anal seta (Pa). Anal opening small and oval, without morphological modification for phoresy. Opisthosoma with one pair of long setae inserted on small platelets lateral to ventrianal shield. Peritreme long, slightly curved, with short post-stigmatic section, stigmata between coxae II and III.

Etymology. The name of this species name refers to its widespread occurrence in Tasmania.

Notes. Castriidinychus tasmanicus was the most widespread of the three species described here (Fig. 24), but never occurred in large numbers. Most records were in litter, moss and fungi under rainforest in western Tasmania, but it also occurred in remnants of Nothofagus forest in the northeast.


Australian National Insect Collection


Departamento de Geologia, Universidad de Chile