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A Re-Examination of Dithyridium Cynocephali Ransom 1905, a Metacestode Parasite from the Thylacine Thylacinus Cynocephalus

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A Re-Examination of Dithyridium Cynocephali Ransom 1905, a Metacestode Parasite from the Thylacine Thylacinus Cynocephalus Papers and Proceedings of the Royal Society of Tasmania, Volume 123, 1989 133 A RE-EXAMINATION OF DITHYRIDIUM CYNOCEPHALI RANSOM 1905, A METACESTODE PARASITE FROM THE THYLACINE THYLACINUS CYNOCEPHALUS by David L. Obendorf and Steven J. Smith (with one table and one plate) OB ENDORF, D.L. & SMITH, S.J., 1989 (3 l :x): A re-examination of Dithyridium cynocephali Ransom 1905, a metacestode parasite from the thylacine Thylacinus cynocepha/us. Pap. Proc. R. Soc. Tasm. 123: 133-136. https://doi.org/10.26749/rstpp.123.133 ISSN 0080-4703. Tasmanian Department of Agriculture, PO Box 46, Kings Meadows, Tasmania 7249 (DLO); and Tasmanian Department of Lands, Parks & Wildlife, GPO Box 44A, Hobart, Australia 7001 (SJS). Re-examination of Dithyridium cynocephali Ransom 1905, a metacestode parasite from the thylacine Thy/acinus cynocepha/us, has revealed it to be morphologically indistinguishable from metacestodes of the tapeworm Anoplotaenia dasyuri found in the eastern quoll Dasyurus viverrinus and the spotted-tailed quoll D. maculatus, in Bennett's wallaby Macropus rufogriseus rufogriseus and in the Tasmanian pademelon Thylogale billardierii. The Tasmanian devil Sarcophilus harrisii is the predominant definitive host for A. dasyuri, but the two quoll species can also serve as definitive hosts. It is considered likely that quolls may act as intermedia,e hosts through the occasional consumption of Tasmanian devil faeces containing infective A. dasyuri eggs. The thylacine may have become infected with A. dasyuri in a similar manner, by engaging in coprophagy in the wild or in captivity. Key Words: thylacine, Anoplotaenia dasyuri, metacestodes, coprophagy, Dithyridium cynocephali. INTRODUCTION several additional sections prepared at Mount Pleasant Laboratories, Launceston, from alcohol­ On 4 November 1904, a mature female thylacine preserved specimens were examined. These Thylacinus cynocephalus died at the National specimens were compared with metacestodes Zoological Park in Washington, D.C., U.S.A. At the obtained from the hearts of naturally-infected necropsy performed at the National Museum " ... Bennett's wallabies Macropus rufogriseus encysted larval forms of a tapeworm were found in rufogriseus and Tasmanian pademelons Thylogale all the muscular structures of the body". Ransom billardierii. Metacestodes recovered from two (1905) published a brief report of the larval cestode eastern quolls Dasyurus viverrinus and four recovered from the heart and skeletal muscles of spotted-tailed quolls D. maculatus from the Cradle the animal and named the parasite Dithyridium Mountain region were also examined. In addition cynocephali. Fortunately, specimens of the parasite to this material, a metacestode found in masseter were also lodged in the National Parasite muscle from an alcohol-preserved thylacine skull Collection (NPC) of the United States Department (NMV C5752) from the Museum of Victoria was of Agriculture. When metacestodes were recently also examined. found in the heart and skeletal muscles of eastern All preserved specimens and muscle tissues were quolls Dasyurus viverrinus and spotted-tailed prepared for microscopic examination using routine quolls D. maculatus from Tasmania's northwestern histological techniques. Specimens were de­ highlands, a re-examination of the parasite from hydrated through increasing concentrations of ethyl the thylacine was undertaken. The only other alcohol, paraffin embedded and sectioned at a parasites recorded from the thylacine are the thickness of 5 µm. Sections were placed on glass endemic Tasmanian flea Uropsylla tasmanica slides, stained with haematoxylin and eosin, and (Dunner & Mardon 1974) and the ascaridoid examined with a light microscope. Measurements nematode Ascaridia columbae (Sprent 1972). of various parts of the metacestodes were taken using an ocular micrometer. Histological sections of metacestodes from MATERIALS AND METHODS eastern quoll, spotted-tailed quoll and thylacine have been lodged on slides in the Australian For this study, the original slides of serial-sectioned Helminth Collection (AHV 18680, AHC 18681, Dithyridium cynocephali (NPC No.3888) and AHC18682 & AHC18683). Samples of preserved 134 D. L. Obendorf and S. J. Smith infected muscle tissue from thylacine and spotted­ lined by cuticle and containing four suckers. The tailed q Doll have been lodged in the same collection cuticle in these areas was very thick and overlaid (AHC18684 & AHCI8685). large numbers of cell nuclei. In some specimens from all hosts a small bladder or vesicle was seen in the posterior pole of the metacestode; several RESULTS AND DISCUSSION showed an osmoregulatory canal consisting of a tubular invagination lined. with cuticle and Although somewhat faded, the original mounted measuring 80 to 210 11m in length. The dimensions specimens from the thylacine (NPC No.3888) had of the whole metacestode, the suckers and the sufficient clarity and contrast for proper cuticle thickness of various specimens from the examination. Freshly-prepared sections of thylacine (NPC No.3888), the two quoll species metacestodes from this thylacine stained more and the two macropods are presented in table I. intensely, but the age of the specimens caused the The metacestodes recovered from the two differential staining properties of the haematoxylin macropods are typical of the intermediate host and eosin dyes to be suboptimal. stage of the tapeworm Anoplotaenia dasyuri. All The metacestodes from the thylacine were those examined and described in this study are morphologically indistinguishable from those similar to A. dasyuri metacestodes originally recovered from two extant dasyurids D. viverrinus described from experimentally infected mice and D. maculatus, and two macropods M. r. (Beveridge et al. 1975) and to those from naturally rufogriseus and T. billardierii. In all hosts, infected Tasmanian marsupials (Gregory et al. metacestodes were circular to ovoid and were 1975). The only difference in the description of contained within a fibrous connective tissue metacestodes from experimentally and naturally capsule produced by the host tissues. In skeletal infected marsupials was the absence of a posterior muscle tissues they were generally aligned with bladder or vesicle in metacestodes from the muscle fibres, and fat tissue was present at each laboratory mice. This difference was not considered pole of the outer fibrous capsule. They had a thick significant, as the feature also appeared to be cuticle or tegument and an underlying muscle variable in specimens from naturally infected hosts. system; numerous cell bodies were arranged in a Ransom (1905), in his original report, considered dense aggregate under the cuticle, adjacent to the that the larval cestodes in the thylacine were muscles. The body of the parasite consisted of open probably derived from a comparatively recent parenchyma in which cell nuclei were scattered; a infection acquired through ingestion of infective distinctive characteristic of the parenchyma was the tapeworm eggs at the Zoological Park in presence of numerous calcareous corpuscles. The Washington. Re-examination of this museum scolex was unarmed and invaginated into the body material and its comparison with metacestode of the metacestode, the invaginated portion being infections of A. dasyuri in M. r. rufogriseus and TABLE I Dimensions of the Metacestodes from Various Hosts Host Metacestode* Suckers* Cuticle length width length width thickness* mm mm mm mm mm ------ -------.~ Thylacinus cynocephalus 652 343 162 113 5 (430-880) (220-380) (107-182) (90-164) (3.8-6.5) Dasyurus spp. 654 349 148 109 4.5 (400-930) (230-460) (139-165) (78-139) (3.2-5.5) Macropus r. rufogriseus 487 266 138 66 5.5 Thylogale billardierii (370-560) (215-315) (115-150) (60-75) (4.1-6.2) -------- *Mean measurements of ten specimens, range in parenthesis. A metacestode parasite ./i"om the thylacine 135 T. hillardierii suggest that the parasite reported could occur if quolls consumed either herbage from this captive thylacine is almost certainly the containing eggs or the faeces of the Tasmanian endemic Tasmanian parasite A. dasyuri (pI. I). At devil; the relatively high levels of infection by the time of the recovery of this parasite from the metacestodes indicate that the latter is more likely. thylacine and its subsequent naming by Ransom Another possibility for transmission to the quolls is (1905), A. dasyuri was unknown and its indirect that invertebrates (such as insects and earthworms), life cycle was not elucidated until relatively associated with soil, herbage or faeces, are recently (Gregory et al. 1975). involved as mechanical vectors of Anoplotaenia Anoplotaenia dasyuri is an abundant parasite in eggs. Anoplotaenia dasyuri has not, however, been Tasmania, maintained through a carnivore-carrion recorded in the two species of bandicoot in feeding association involving the Tasmanian devil Tasmania, Perameles gunnii and Isoodon ohesulus, Sarcophilus harrisii as definitive host and certain both of which eat large quantities of these macropod species as intermediate hosts (Gregory et invertebrates. al. 1975). Adult tapeworms occur in the small All of the quolls with metacestode infections intestines of Tasmanian devils, and metacestode were old or injured, with worn or missing teeth, stages are found in the hearts, lungs and skeletal foot injuries or arthritic problems; such debilitated muscles of macropods, principally M. r. rufogriseus individuals are likely to be less successful predators and T. hillardierii.
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