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Macvicaria dextrocaula Aken' Ova, Cribb & Bray 2008

Macvicaria dextrocaula ( Dutch; Flemish )

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Macvicaria dextrocaula is een soort in de taxonomische indeling van de platwormen (Platyhelminthes). De worm is tweeslachtig en kan zowel mannelijke als vrouwelijke geslachtscellen produceren. De soort leeft in zeer vochtige omstandigheden.

De platworm behoort tot het geslacht Macvicaria en behoort tot de familie Opecoelidae. De wetenschappelijke naam van de soort werd voor het eerst geldig gepubliceerd in 2008 door Aken’Ova, Cribb & Bray.

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05-12-2011
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Description

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Based on 11 gravid, unflattened dorso-ventrally and laterally mounted specimens and 1 set of serial sagittal sections from Notolabrus parilus. Measurements of worm from Notolabrus fucicola are given in Table 3. Measurements are of 5 gravid, unflattened, dorso-ventrally mounted worms. Body elongate-oval, sub-cylindrical, sharply inflected dorsally in area of ventral sucker in lateral view, with maximum width in region of ventral sucker, 936-1,455 (1,202) × 295-466 (362); width to length ratio 1:3.2-3.6 (3.3). Oral sucker ventrally subterminal, sub-spherical, 129-169 (147) × 141-196 (164). Ventral sucker sub-spherical, close to mid-body, completely surrounded and almost completely enclosed by tegumental fold, 181-234 (212) × 197-276 (237), sucker-width ratio 1:1.4-1.5 (1.4) Forebody moderately long, 307-514 (408) long, 32-35 (34)% body-length. Prepharynx indistinct, short, always entirely dorsal to oral sucker. Pharynx well developed, subglobular, usually partly dorsal to oral sucker, rarely entirely dorsal to oral sucker (n=1); 49-65 (55) × 65-90 (79); pharynx to oral sucker width ratio 1:1.9-2.2 (2.1). Oesophagus short, thick walled. Intestinal bifurcation 96-222 (163) anterior to ventral sucker. Caeca terminate blindly close to posterior extremity. Testes 2, entire, subspherical, tandem, contiguous to overlapping, close to posterior end of body, anterior 63-132 (98) × 112-194 (147); posterior 85-148 (115) × 112-196 (150). Post-testicular area short, 105-137 (127) long, 9.4-13(11)% body-length. Cirrus-sac well developed, tubular, long, slender, extends from just posterior to intestinal bifurcation overlapping right caecum to point anterior to or posterior to ventral sucker aperture, 226-366 (297) × 34-60 (43). Internal seminal vesicle, slender, tubular, occupies posterior half of cirrus-sac, posterior portion surrounded by prostatic cells. Pars prostatica small, inconspicuous, surrounded by few gland cells. Ejaculatory duct relatively long, with few prostatic cells in rows along its length. Genital pore dextrally sub-median, caecal to extracaecal, just posterior to intestinal bifurcation, surrounded by gland cells, 209-290 (240) from anterior end, 17 -24 (20)% body-length. Ovary pretesticular, entire, subspherical, contiguously overlaps anterior testis, 90-139 (104) × 103-152 (127). Mehlis’ gland distinct antero-dorsal to ovary. Canalicular seminal receptacle saccular, antero-dorsal to ovary. Uterus coils between anterior testis and posterior margin of ventral sucker, sometimes overlapping caeca; terminal portion usually crammed with eggs. Metraterm distinct, surrounded by gland cells. Eggs oval, operculate, 39-56 (48) × 22-34 (28). Vitelline follicles extend from 130-185 (162) from anterior extremity, 11-18 (14)% of body-length, to 8-24 (15.4) from posterior extremity; follicles in two separate fields ventrally, confluent dorsally in forebody with interruption in ventral sucker area; fields lie lateral, ventral and dorsal to caeca with anterior limit usually anterior to posterior margin of pharynx, sometimes level with posterior margin (n=2) or up to anterior margin of pharynx (n=1). Excretory pore usually ventrally subterminal, occasionally dorsally subterminal (n=1). Excretory vesicle I-shaped, posterior end narrow, surrounded by gland cells, wider anterior portion passes anteriorly to overlap posterior third of ovary dorsally. Etymology: The specific name dextrocaula (L. dextra, right; L. caula, opening) refers to the worm’s dextrally located genital pore.
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bibliographic citation
Eight new species of Macvicaria Gibson and Bray, 1982 (Digenea: Opecoelidae) mainly from endemic temperate marine fishes of Australia
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Distribution

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Type-host: Notolabrus parilus (Richardson) (Labridae). Other host: Notolabrus fucicola (Richardson) (Labridae). Type-locality: Off Point Peron, Western Australia 32°18’S, 115°38’E. Other localities: Off North Mole, Western Australia 32°03’S, 115°43’E.; Off American River, South Australia 35°48’S, 137°46’E. Site: Intestine. Material studied: Ex Notolabrus parilus: 9 from off Point Peron Western Australia and from off North Mole, December 1994; Ex Notolabrus fucicola: 1 from off American River, South Australia, December 1995. Type-material: Holotype: QM G230415, paratypes: QM G230416-230422, BMNH 2008.7.5.40-43.
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