Fedrizzia scutata (Womersley)

Seeman, Owen D., 2007, Revision of the Fedrizziidae (Acari: Mesostigmata: Fedrizzioidea), Zootaxa 1480, pp. 1-55: 29

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http://doi.org/ 10.5281/zenodo.176844

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Fedrizzia scutata (Womersley)


Fedrizzia scutata (Womersley)  

Neofedrizzia scutata Womersley, 1959: 35   . Comb. nov.

Neofedrizzia bicornis   – Karg, 1997: 54. Syn. nov.

Type specimens. Holotype, F, PAPUA NEW GUINEA: Bulolo, 3.ix. 1954, H. Womersley, on passalid beetle (N 1952374). In SAMA. Paratypes, 2 F, same data as holotype (N 1952375 -N 1952376 a-c).

Other specimens. Holotype, F, An einem Passaliden (Zuckerkäfer) auf West-Guinea, 1992, leg. M. Balke. Also with label “ Neofedrizzia bicornis   F KARG. 6683, F”, marked holotype by a red T.

Diagnosis. Both sexes: idiosoma   1118–1260 long, with anterior hyaline projection extending posteriorly just past level of Cx IV, without large pores; ventral, ventrianal and marginal shields smooth to lineate-reticulate; anterolateral corner of ventrianal shield not fused with ventral shield; exopodal patterning between CxII – III striped; pedofossae III present; CxIV-marginal suture present; femur III and IV with large lamellae, seta pv 1 thickened; femur IV not elongated; seta h 1 with swollen base. Female: setae st 2 23–33, st 3 31–33, st 4 33– 40; lyrifissure stp 2 level with stp x; sternogynial shield weakly reticulated to smooth, loosely flanked by several pores, not surrounded by a distinct smooth area. Male: not seen, probably without suture behind genital opening.

Remarks. In addition to the diagnosis, F. scutata   lacks the large pair of pores posteromedially of CxIV, the pores laterad CxIV are not clustered (but are in a longitudinal line), and the lateral setae of the ventrianal shield are 10–20 long. The holotype is in average condition. The best specimen is the paratype N 1952376 a –c. This anomalous species appears intermediate between Neofedrizzia   and Fedrizzia ( Womersley 1959)   . Characters shared with Fedrizzia   are: the form of the sternogynial shield; pores laterad Cx IV in a longitudinal line; large (10 – 20 long) lateral setae on the ventrianal shield; palp trochanter with seta av 1 pilose; corniculi on hypostomal tubercles; seta h 1 straight, smooth; and both cheliceral excrescences ribbon-like and of similar size. Characters shared with Neofedrizzia   are: proximal seta of femur IV spine-like; pedofossae III and CxIV – marginal suture present; and exopodal patterning striped. I have reclassified F. scutata   mostly because of the inverted bell-shaped genital shield, but also for the other characters it shares with Fedrizzia   .

Fedrizzia scutata   is so similar to Neofedrizzia bicornis Karg   that I have synonymised these species. Karg (1999) does list some differences between these species, but I do not deem these sufficient to separate them. Firstly, the length:width of the idiosoma   and anal shield is almost identical; the five large pairs of ventrianal shield setae are present in both species ( Womersley [1959] shows these only for Fedrizzia   sp. cf. grossipes   , but Fedrizzia   spp. have lateral setae 10–30 long on the ventrianal shield); and setae st 3 and st 4 are almost the same length (33 each for F. scutata   , 40 and 31 for N. bicornis   ). The form of the palp trochantal process has one spine in F. scutata   and two in N. bicornis   , but I have already discussed the problems of interpreting this structure in the Remarks section for F. c a r a b i. The only other difference is that lyrifissure stp 2 is posterior of st 2 in F. scutata   but level with seta st 2 in N. bicornis   . This character does hint that the species could be different, but I have seen some variation in the placement of stp 2, so I cannot accept that N. bicornis   is a different species from F. s c u t a t a.


University of Newcastle


South Australia Museum














Fedrizzia scutata (Womersley)

Seeman, Owen D. 2007

Neofedrizzia scutata

Womersley 1959: 35