New species of Syphacia (Syphacia) Seurat (Nematoda: Oxyuridae) from Pseudomys species (Rodentia: Muridae) from central Australia
Author
Weaver, H. J.
School of Biological and Environmental Sciences, Central Queensland University, Rockhampton, Queensland 4702.
Author
Smales, L. R.
Parasitology Section, South Australian Museum, North Terrace, Adelaide, South Australia 5000
text
Zootaxa
2008
2008-05-23
1775
1
39
50
https://biotaxa.org/Zootaxa/article/view/zootaxa.1775.1.3
journal article
10.11646/zootaxa.1775.1.3
11755334
5124245
Syphacia (Syphacia)
sp. 2
(
Figs 19–20
)
Material examined.
From
the caecum of
Pseudomys hermannsburgensis
, Bladensburg
National Park
,
Queensland
(
22
o
30’S
,
143
o
02’E
),
13.iii.2001
,
6 females
AHC
34472
;
Ethabuka Station
,
Queensland
(
23
o
48.79’S
,
138
o
03.62’E
),
August 1999
,
7 females
AHC
34473
;
Nappa Merrie Station
,
Queensland
(
27
o
23’S
,
141
o
20’E
),
21.viii.1975
,
3 females
AHC
34471
;
Nockatunga Station
,
Queensland
(
27
o
43’S
,
142
o
43’E
),
18.vii.1976
,
45 females
,
AHC
34470
.
Description. Female:
Small nematodes, cuticle with faint striations. Cephalic plate oval, constricted dorsally and ventrally between mouth opening and level of amphids and cephalic papillae which are close together laterally, not on edge of plate (
Fig. 17
). Mouth opening surrounded by 3 lips. Deirids not seen. Small cervical alae present, lateral alae absent. Length 1480–3580. Maximum width 130–215. Amphids 34 apart. Oesophagus length 158–245. Oesophageal bulb
60–85 in
diameter. Nerve ring 85–163, excretory pore 205– 388, vulva 332–672 from anterior. Tail 200–473 long. Eggs 85–123 long, 28–38 wide.
Remarks.
For the same reasons as discussed above for
S. (S.) brevicaudata
and
S. (S.) pseudomyos
, these females belong in the subgenus
Syphacia
Seurat, 1916
. The females of
Syphacia
sp. 2
can be distinguished from that group of
Syphacia
spp.
which also have oval cephalic plates, dorsally and ventrally constricted between the mouth opening and the laterally positioned amphids and cephalic papillae as follows: from
S. (S.) brevicaudata
,
and
S. (S.) pseudomyos
by the presence of cervical alae and from
S. (S.) abertoni
by having larger eggs (Table 2). Of the other species occurring in the region the presence of cervical alae distinguishes
Syphacia
sp. 2
from
S. (S.) australasiensis
and
S. (S.) muris
, which both have quadrangular shaped cephalic plates and no cervical alae. Whereas
S. (S.) darwini
,
S. (S.) longaecauda
and
S. (S.) sulawesiensis
,
which have oval cephalic plates and lateral alae, can be further distinguished by longer tails, 200–473 compared with 700, 616–850 and 544–670 respectively (
Quentin 1971
;
Hugot & Quentin 1985
;
Hasegawa & Tarore 1996
;
Smales 2001
;
2004
).
Syphacia (Syphacia)
sp. 2 appears to be sufficiently different to other species to be considered a separate species, but in the absence of male specimens, and given the small sample size, more data will need to be collected to confirm this.