Neofedrizzia helenae Seeman

Seeman, Owen D., 2007, Revision of the Fedrizziidae (Acari: Mesostigmata: Fedrizzioidea), Zootaxa 1480, pp. 1-55: 39-40

publication ID 10.5281/zenodo.176844

publication LSID

persistent identifier

treatment provided by


scientific name

Neofedrizzia helenae Seeman

sp. nov.

Neofedrizzia helenae Seeman   sp. nov.

( Figs 5–8 View FIGURES 5 – 8 , 41– 43 View FIGURES 41 – 43 )

Type specimens. Holotype, F, AUSTRALIA: Queensland: Atherton Tableland, Curtain Fig, 27.i. 1996, O. Seeman, on passalid M. australasicus   ( S 74146 View Materials ). Paratypes, Atherton Tableland: 2 F, 2 M, Curtain Fig, 6.iv. 1995, D. E. Walter ( S 74147 View Materials - 50); 2 F, 2 M, Gadgarra, 7.iv. 95, D. E. Walter ( S 74151 View Materials - 54); F, M, Mt Baldy, 8.iv. 1995, D. E. Walter ( S 74155 View Materials - 56); F, 2 M, same data as holotype ( S 74157 View Materials - 60); F, M, Road to Mt Bartle- Frere, 28.i. 1996, O. Seeman ( S 74161 View Materials - 62); F, M, 9 km S Ravenshoe, 28.i. 1996, O. Seeman ( S 74162 View Materials - 63); F, M, Wright’s Ck, 28.i. 1996, O. Seeman ( S 74164 View Materials - 65). All from M. australasicus   and deposited in QM. M, same data as holotype, deposited in ANIC.

Other specimens. M, Atherton Tableland, 28.iii. 1945, D. L. Collis, on Megisthanus   sp. (N 1952363). In SAMA. 3 F, 4 M, Queensland, Eubenangee near Innisfail, 11.xii. 1945, J. C. Brooks, on passalid (N 1952453 - N 1952359). In SAMA.

Diagnosis. Both sexes: idiosoma   1450–1550 long; anterior hyaline projection does not extend past CxI; exopodal patterning between CxII –III striped; pedofossae III present, IV absent; seta h 1 with 5–6 barbs; distal spine-like process on palp femur minute; one non-filamentous excrescence ribbon-like, the other a short serrated blade; femur III and IV with large lamellae. Female: sternal shield reticulated; seta st 1 68–70, a little shorter than base of tritosternum; setae st 2 54–66, st 3 18–30, st 4 5–6 long; sternogynial shield smooth, anterior margin straight. Male: tetartosternum absent, presternal processes articulated with sternoventral shield, membranous, asymmetrical, the left process a little larger than the right, tips separate from each other; sternoventral shield (anterior of genital opening) smooth; seta st 1 38–39 long; genital opening placed between CxII – III, flanked by 20–28 pores.

Description. Female: Idiosoma   1450–1520 long, 1080–1130 wide, anterior hyaline projection with 1 pair barbed setae 86–90 long. Tritosternum base 88–90 long, 38–43 wide. Tetartosternum and sternal shield reticulate; tetartosternum crown-shaped; st 1 barbed, 68–70 long; st 2 barbed, 54–66 long; st 3 18–30 long, st 4 5–6 long. Sternogynial shield 146–156 long, 150–164 wide, smooth, numerous pores flank shield. Ventral shield lineate, lightly reticulate medially; 1 pair of large semi-circular pores posteromedially of Cx IV, 1 pair of eyelike pores, ca. 25 pairs of small round pores, and ca. 15 pairs of small (<5 long) setae. Ventrianal shield 290– 330 long, 640–710 wide, with lineate reticulation, paranal setae 102–108 long, other setae minute; anterolateral corner of ventrianal shield not fused with ventral shield. Marginal shields with lineate reticulation. Pedofossae III and CxIV-marginal suture present.

Legs. TrI with seta pv 1 slightly thicker than seta av 1. FeI with seta pv 3 longer and thicker than setae pv 1 and pv 2. FeII with ventral lamella, seta ad 1 barbed and thickened. GeII with seta ad 3 and pd 3 short, slightly thickened. FeIII with lamella, expanded distal to av 1, seta pv 1 spine-like. GeIII with seta pd 2 spine-like. FeIV with lamella, expanded distal to av 1, seta pv 1 thick, spine-like, seta ad 2 setiform, seta pd 2 in line with seta ad 2. TaII –IV with seta av 2 spine-like, shorter than seta av 3. Legs II –IV with setiform ad and pd setae.

Gnathosoma   . Seta h 1 curved, with 5–6 large barbs, 76–89 long, distance between h 1 –h 1 13–15; h 2 barbed 60–65 long; h 3 minute, posterolaterad h 2; palpcoxal seta 27 long. Corniculi not on tubercles. Palp, seta av 1 on trochanter with many small barbs, seta av 2 with a few small barbs. Chelicera, fixed digit 248–250 long, movable digit 62–65 long; fixed digit with 2 large and 1 minute subapical tooth; excrescences consist of a large brush-like process, a short serrated blade, and a ribbon-like process with a crenate margin that extends well beyond the end of the chelicerae.

Male: Idiosoma   1480–1550 long, 1110–1150 wide. Tritosternum base broad, 101–113 long, 98–108 wide. Presternal processes membranous, triangular, asymmetrical, left process larger than right. Sternal shield anterior of male genital opening smooth. Seta st 1 smooth, 38–39 long. Genital opening 78–83 long, 87–93 wide, with 20–28 large pores laterad the opening. Large lamellae on Cx I. Seta h 3 posterolaterad h 1, anterior h 2.

Remarks. This species is the largest Fedrizziidae   and occurs in northern Queensland on M. australasicus   . Apart from its size, this species is also distinguished by the males’ membranous presternal processes, but in many slides the presternal processes fold over the sternal shield and are difficult to see. The male specimen from Womersley’s collection (N 1952363) was originally considered as N. gayi   ; the remainder of Womersley’s collections (N 1952453 -N 1952359) were included with N. tragardhi   .

Etymology. It is a pleasure to name this species for my partner, the lovely Helen Nahrung.


Australian National Insect Collection


South Australia Museum