Progamotaenia dilatata Beveridge &amp; Shamsi, 2009, sp. nov.
Creators: name: Beveridge, I.
name: Shamsi, S.
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Platyhelminthes
Cestoda
Cyclophyllidea
Anoplocephalidae
Progamotaenia
Progamotaenia dilatata

description: <i>Progamotaenia dilatata</i> sp. nov. (Figs 44–50) <b>Synonyms:</b> <i>Progamotaenia festiva</i> (Rudolphi, 1819) in part, Beveridge (1976), Beveridge <i>et al</i>. (1985, 1998), Spratt <i>et al</i>. (1991). <b>Host:</b> <i>Wallabia bicolor</i> (Desmarest) (Marsupialia: Macropodidae). <b>Site in host:</b> bile ducts. <b>Types:</b> Holotype, Nariel, Victoria (36º 20'S 147º 48'E), coll. D.M. Spratt, 29.v.1974, SAM 29364; 2 paratypes, same data SAM 29365. <b>Etymology:</b> from <i>dilatatus</i> (= widened) referring to the broad anterior end of this species. <b>Material examined:</b> From <i>Wallabia bicolor</i> (swamp wallaby): <b>Queensland</b>: 1 specimen, Dingo Beach (SAM 29370 (S)), 1 specimen, Airlie Beach (SAM 29376 (S)); 2 specimens, Rockhampton (SAM 19757 (S)); <b>New South Wales</b>: 6 specimens, Dubbo (SAM 29368 (S)), 1 specimen, Ourimbah (SAM 20067 (S), 1116(W)), 1 specimen, Nowra (SAM 21489 (S)); <b>Australian Capital Territory</b>: 1 specimen, Tidbinbilla (WLHC S310 (S), C235 (W), BMNH 2008.3.6.12 (S)); <b>Victoria</b>: fragments, Nariel (SAM 29366 (S), 25408(W)), 3 specimens, Cudgewa (SAM 20825, WLHC C6, C12 (S)), 2 specimens, Dartmouth (SAM 20928); 1 specimen, Dixon’s Creek (SAM 29369 (S)). <b>Description:</b> Broad worms, 12–58 (35) long, maximum width 3–8 (5.7) with 92–228 (167) segments in gravid specimens. Scolex 0.85–1.30 (1.06) in diameter, squat, weakly 4-lobed; suckers circular, 0.293 –0.569 (0.436) in diameter. Neck very short. First mature segment 22–41th (32, n=7). Mature segments craspedote, 1.46–2.68 (2.11) wide, 0.065 –0.179 (0.125) long. Genital atrium small, in middle or slightly posterior to middle of lateral segment margin; cirrus sac elongate, extending well beyond osmoregulatory canals, 0.163 –0.598 (0.423) long, 0.046 –0.117 (0.079) wide; cirrus unarmed; internal seminal vesicle occupies approx. 2/3–3/4 of volume of cirrus sac, 0.065 –0.377 (0.243) long, 0.020 –0.052 (0.040) wide; elongate external seminal vesicle, covered with layer of glandular cells, 0.072 –0.208 (0.134) long, 0.033 –0.143 (0.070) wide; vas deferens coils medially, dorsal to uterus; testes arranged in anterior half of segment between osmoregulatory canals; no prominent space between canals and testis fields; testes arranged in 2 dorso-ventral layers, in single band or in 2 separate groups separated by small space. Testes 0.033 –0.065 (0.050) in diameter; testis number 68–78 (75, n=5). Vagina tubiform, lacking glandular investment, opens to genital atrium posterior to cirrus sac, leads to ovoid to subspherical seminal receptacle 0.130 –0.293 (0.212) x 0.052 –0.195 (0.104). Ovary flabelliform, medial to seminal receptacle 0.065 –0.124 (0.085) x 0.033 –0.078 (0.051), fully developed in few segments; vitellarium reniform, posterior to ovary, 0.078 –0.195 (0.124) x 0.046 –0.098 (0.066); Mehlis’ gland anterior and medial to vitellarium. Uteri paired in each segment, transverse, tubular; early uterus extends from level of ovary to or beyond proximal pole of cirrus sac; developing uterus extends medially and laterally, lateral extensions crossing osmoregulatory canals dorsally; uteri of each segment do not meet in mid-line. Gravid segments 0.147 –0.406 (0.241) long, 2.28–4.23 (3.27) wide. Egg spherical, shell smooth, 0.055 –0.062 (0.058) in diameter; pyriform apparatus conical, terminating in numerous fine filaments at apex; oncosphere 0.012 –0.016 (0.013) in diameter. Osmoregulatory canals paired; ventral canal generally wider than dorsal, medial to it; ventral canal 0.013 –0.046 (0.023) in diameter, dorsal canal 0.007 –0.026 (0.013) in diameter; transverse canal connects ventral canal at posterior margin of each segment; accessory canals absent. <b>Remarks.</b> <i>P. dilatata</i> differs from <i>P. festiva</i> in having a very short neck and a cirrus sac which extends well into the medulla. It differs from <i>P. fellicola</i> and <i>P. aemulans</i> in lacking a distinctive space between the testis fields and the osmoregulatory canals, and from <i>P. pulchella</i> in that the testes are usually distributed in a single band rather than being invariably distributed in two separate groups. It can be distinguished from <i>P. corniculata</i> by the long neck of the latter species and by the fact that the pyriform apparatus of <i>P. corniculata</i> terminates in two separate horns without reflexed filaments. <i>P. dilatata</i> differs from <i>P. onychogale</i> in being an elongate cestode rather than being short and foliiform; <i>P onychogale</i> has up to 84 segments while <i>P. dilatata</i> has 92–228 segments. <i>P. dilatata</i> differs from <i>P. adspersa</i> in <i>M. irma</i> in that the cirrus sac of the latter species extends just across the osmoregulatory canals in to the medulla while approximately 50% of the cirrus sac of <i>P. dilatata</i> lies within the medulla. In addition, the size of the suckers of <i>P. dilatata</i> (0.29–57 (0.44) mm) exceeds those of <i>P. adspersa</i> (0.18–0.26 (0.23) mm). <i>P. dilatata</i> is readily distinguishable from <i>P. vombati</i> in the shape of the scolex (Figs. 45, 46) and in the number of testes per segment which are 83–122 (98) in <i>P. vombati</i> and 68–78 (75) in <i>P. dilatata</i>.
description: Published as part of <i>Beveridge, I. &amp; Shamsi, S., 2009, Revision of the Progamotaenia festiva species complex (Cestoda: Anoplocephalidae) from Australasian marsupials, with the resurrection of P. fellicola (Nybelin, 1917) comb. nov., pp. 1-29 in Zootaxa 1990</i> on pages 19-21
description: {"references": ["Rudolphi, C. A. (1819) Entozoorum synopsis cui accedunt mantissa duplex et indices locupletissimi. Augustus Rucker, Berolini, pp. 811.", "Beveridge, I. (1976) A taxonomic revision of the Anoplocephalidae (Cestoda: Cyclophyllidea) of Australian marsupials. Australian Journal of Zoology, Supplementary Series, 44, 1 - 110.", "Beveridge, I., Presidente, P. J. A. &amp; Speare, R. (1985) Parasites and associated pathology of the black-tailed wallaby, Wallabia bicolor (Marsupialia). Journal of Wildlife Diseases, 21, 377 - 385.", "Beveridge, I., Chilton, N. B., Johnson, P. M., Smales, L. R., Speare, R. &amp; Spratt, D. M. (1998) Helminth parasite communities of kangaroos and wallabies (Macropus spp. and Wallabia bicolor) from north and central Queensland. Australian Journal of Zoology, 46, 473 - 495.", "Spratt, D. M., Beveridge, I. &amp; Walter, E. L. (1991) A catalogue of Australasian monotremes and marsupials and their recorded helminth parasites. Records of the South Australian Museum, Monograph Series, 1, 1 - 105."]}