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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

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