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Buckarootrema minuta Snyder et Tkach, 2006Type host:Victoria River red-faced turtle, Emydura victoriae (Gray, 1842) LocalitiesType locality: Victoria River at Victoria Highway, Gregory National Park, Northern Territory, Australia, 15° 36.85’S, 131° 7.86’E. Type specimens:Holotype: Queensland Museum (QM) no. G225312. Paratypes: QM no. 225313-225317; Harold W. Manter Laboratory no. HWML48166 (a lot 5 specimens on two slides). Description (from Snyder and Tkach, 2006)Description based on 11 adult specimens. Measurements of the holotype are given in the text; measurements of the entire type series are given in Table 1. Body small, anterior end with well developed incomplete cephalic collar, posterior end rounded; tegument unarmed. Body length 675, maximum width at level of cephalic collar 230. Oral sucker spherical, 50 in diameter, mouth opening slightly subterminal. Thin esophagus 150 long, with bulb-like widening just anterior to cecal bifurcation. Cecal walls comprised of large gland-like cells. Ceca terminate 160-165 from posterior end of body, at anterior margins of testes or slightly overlapping them. Oval or rounded testes opposite to slightly oblique, situated in posterior half of body at terminus of ceca. Both testes 75 x 60. Cirrus sac large, 255 x 38, with proximal end near anterior margin of left testis. Proximal portion of cirrus sac straight while distal portion curved, opening into genital atrium situated ventral to left cecum 315 from anterior end of body. Cirrus sac contains internal seminal vesicle, an oval prostatic region containing glandular droplet-like cells and ejaculatory duct; evaginated cirrus not observed. External seminal vesicle elongate and occasionally coiled with variable orientation. Ovary oval or rounded, 50 x 45, situated between right
testis and proximal part of cirrus sac. Vitellarium consists of 2 compact
follicular masses of variable shape (usually elongate) at anterior distal
sides of each testis. Approximately one half to two thirds of vitelline
masses overlap testes. Right follicular mass 88 long, left follicular
mass 100 long. Thick walled uterus coils mainly postovarian and postcecal.
Eggs posterior to ovary with very few extending anterior. Muscular metraterm
80 long, begins about midpoint of cirrus sac. Uterus opens into genital
atrium near male genital opening. Eggs oval, 30-31 x 13, with long polar
processes. It was impossible to adequately measure the polar process
length on total mounts. Excretory pore terminal; excretory bladder Y-shaped
with short stem and long arms reaching anterior to intestinal bifurcation. Illustrations
Buckarootrema minuta. A, C- holotype B - paratype. Scale bar: 0.5 mm. |
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Authors: Vasyl V. Tkach, Scott D. Snyder, Yuriy Kuzmin |
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