Comparative Parasitology 67(1) 2000 - Peru State College
Comparative Parasitology 67(1) 2000 - Peru State College
Comparative Parasitology 67(1) 2000 - Peru State College
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tion in a circular buccal capsule. The nerve ring<br />
is in the mid-esophageal position in P. tasmaniensis<br />
but is posterior and surrounds the isthmus<br />
in P. pearsoni. Popovastrongylus wallabiae, the<br />
other species occuring in Tasmania (Mawson,<br />
1977), has a quadrangular mouth opening and a<br />
buccal capsule circular in cross-section. The<br />
submedian papillae of P. wallabiae are short,<br />
and the setae are not easily seen at low magnifications,<br />
while P. tasmaniensis has prominent<br />
papillae and setae. The dorsal lobe of the bursa<br />
of P. tasmaniensis is shorter (about the same<br />
length as the lateral lobes), not longer than the<br />
lateral lobes as in P. wallabiae. Additional characters<br />
that distinguish P. tasmaniensis from P.<br />
irma are not having the base of the buccal capsule<br />
thickened by an outer sclerotized ring and<br />
having the nerve ring in a mid-esophageal, not<br />
posterior, position surrounding the isthmus. The<br />
shape of the posterior end of the female of P.<br />
irma, constricted between vulva and anus and<br />
markedly swollen in the vaginal region, is<br />
unique to P. irma.<br />
Popovastrongylus thylogale, also occurring in<br />
pademelons, can be further distinguished from<br />
P. tasmaniensis by an annular thickening around<br />
the middle of the buccal capsule, the posterior<br />
position of the nerve ring, and the dorsal lobe<br />
longer than the lateral lobes of the bursa.<br />
Popovastrongylus tasmaniensis differs further<br />
from P. macropodis in having a relatively thinner<br />
inflation of the lining of the buccal capsule,<br />
which is expanded anteriorly but does not almost<br />
occlude the lumen as in P. macropodis.<br />
Popovastrongylus pluteus sp. n.<br />
(Figs. 22-31)<br />
Description<br />
GENERAL DESCRIPTION: Small worms; body<br />
covered with numerous fine transverse striations;<br />
mouth opening circular, surrounded by elevated,<br />
finely striated collar indented on external margin;<br />
cephalic collar present, posterior to lateral<br />
collar bearing 2 amphids and 4 cephalic papillae<br />
each with 2 setae. Buccal capsule cylindrical,<br />
circular in cross-section, longer than wide; walls<br />
sclerotized, refractile, thickened in posterior<br />
part; inner lining thick, transparent, folded in<br />
mid-region to produce irregular shelf-like projection,<br />
almost occluding lumen. Esophageal<br />
corpus long, isthmus not distinct, bulb ovoid.<br />
MALES (measurements of 2 specimens):<br />
SMALES—POPOVASTRONGYLUS FROM MARSUPIALS 55<br />
Length 5, 6 mm; width 240, 290; buccal capsule<br />
33, 46 long by 26, 26 wide; esophagus 0.985,<br />
1.01 mm long; nerve ring to anterior end 402,<br />
402; deirids to anterior end 135, excretory pore<br />
to anterior end 470, 455. Spicules 950. Dorsal<br />
and lateral lobes of bursa about equal in length,<br />
ventral lobes shorter. Ventral rays apposed,<br />
reaching margin of bursa; externolateral ray divergent,<br />
almost reaching margin of bursa; mediolateral<br />
and posterolateral rays apposed, reaching<br />
margin of bursa; externodorsal ray arising<br />
close to lateral trunk, almost reaching margin of<br />
bursa; dorsal ray dividing at midlength into 2<br />
arcuate branches that reach margin of bursa, lateral<br />
branchlets short, arising close to bifurcation;<br />
terminating in small elevations on internal surface<br />
of bursa. Anterior lip of genital cone large<br />
and conical, with single apical papilla; posterior<br />
lip smaller, with 2 bilobed appendages. Spicules<br />
elongate, alate, tips not seen. Gubernaculum absent.<br />
FEMALES (measurements of 10 specimens):<br />
Length 7-8 (7.4) mm; width 255-375 (305);<br />
buccal capsule 35-50 (40) long by 22-30 (26)<br />
wide; esophagus 1.02-1.14 (1.08) mm long;<br />
nerve ring 345-390 (370), deirids 105-140<br />
(125), excretory pore 400-475 (435) from anterior<br />
end; tail 470-585 (530) long, vulva to<br />
posterior end 705-885 (790); vagina 400-595<br />
(505); eggs 95-105 (100) by 42-52 (45). Tail<br />
long, slender with conical tip; vulva immediately<br />
anterior to anus; vagina short, broad at anterior<br />
end, ovejector with vestibule and sphincters<br />
about same length, infundibula shorter; eggs ellipsoidal.<br />
Taxonomic Summary<br />
TYPE SPECIMENS: Holotype male SAM A AHC<br />
31253, allotype female AHC 31324, paratypes 3<br />
female, 1 male AHC 14546.<br />
TYPE HOST: Macropus robustus Gould, 1841.<br />
TYPE LOCALITY: Rivertree, New South Wales.<br />
SITE OF INFECTION: Stomach.<br />
SPECIMENS STUDIED: Types from M. robustus,<br />
New South Wales; 17 female from Rivertree,<br />
28 August 1975, SAMA AHC 31252.<br />
ETYMOLOGY: The specific name refers to the<br />
shelf-like projection in the buccal capsule.<br />
Remarks<br />
Popovastrongylus pluteus sp. n. is 1 of 2 species<br />
with a shelf-like projection in the buccal<br />
capsule, the other being P. pearsoni. Popova-<br />
Copyright © 2011, The Helminthological Society of Washington