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Suncusensis Sp. N. (Cestoda: Hymenolepididae) from the Musk Shrew, Suncus Murinus

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Suncusensis Sp. N. (Cestoda: Hymenolepididae) from the Musk Shrew, Suncus Murinus PROCEEDINGS OF THE HELMINTHOLOGICAL SOCIETY Staphylocystis (Staphylocystis) suncusensis sp. n. (Cestoda: Hymenolepididae) from the Musk Shrew, Suncus murinus (Soricidae), from Taiwan, with a Key to the Known Species of Staphylocystis Villot, 1877 O. WILFORD OLSEN AND ROBERT E. KUNTZ Department of Zoology and Entomology, Colorado State University, Fort Collins, Colorado 80523 and Parasitology Department, Southwest Foundation for Research and Education, San Antonio, Texas 78206 ABSTRACT: Compared to the four species previously described from the musk shrew (Suncus murinus) in India, Staphylocystis ( Staphylocystis ) suncusensis sp. n. from this host on Taiwan differs markedly. Staphylocystis (S.) suncusensis has 11-14 rostellar hooks 16-18 ^ long and a strobila 6.4-18.2 mm long. Staphylocystis (S.) sanchorensis Nama and Khichi, 1975 has 30 hooks 15-17 //, long and a strobila 3.11-10.77 mm long. Staphylocystis (S.) sindensis Nama, 1976 has 20 hooks 22-23 //, long and a strobila 7-8.5 mm long. Staphylocystis (S.) minutissima (Meggitt, 1927) has 12 hooks 16-18 /u, long and a strobila 2 mm long. Staphylocystis (S.) soUtaria (Meggitt, 1927) has 16 hooks 16-17 //, long and a strobila 2 mm long. The last two species were reported from Crocidura murina which is probably Suncus murinus. Rostellar hooks of each species are distinct in shape and characteristic of it. Staphylo- cystis (S.) acuta (Rud., 1819) and S. (S.) bacillaris (Goeze, 1782) are transferred to the genus Vampirolepis Spassky, 1950 because of the large number of characteristically shaped rostellar hooks and very long strobilae. The generic description is revised to exclude them. Hymenolepis asketus Brooks and Mayes, 1977 is transferred to S. (Staphylocystoides) on tine basis of two poral testes in relation to the vitelline gland and small strobila. Hymenolepis pauciproglottis Neiland, 1953, as used by Olsen (1969), is recognized as belonging the S. (Staphylocystoides). A key to the known species of Staphylocystis together with illustrations of rostellar hooks of the species are included. Hymenolepidid cestodes collected from the having 101, 131, 216, 257 and 259 recognizable musk shrew Suncus murinus Linnaeus, in Wu proglottids. Mature proglottids up to 477 wide Shi, Nantous Hsien, Taiwan, are considered an by 180 long; gravid ones up to 700 by 180 long; undescribed species of Staphylocystis Villot, neck smooth, up to 234 long; mature and gravid 1877. The collection consists of five strobilae proglottids serrate. Scolex 197-239 wide by that appear complete, one gravid strobila with- 128-213 long; suckers more or less circular, out a scolex, 10 additional scolices, and a 67~82 in diameter. Rostellum 40-45 in diam- number of fragments which formed the basis for eter- Rostellum 40-45 in diameter by 85-146 tV.^ rW™Wirm l°ng; 11-14 rostellar hooks (11 on 5 scolices, the description. 12 ^ ^ ^ ^ ^ ^ ^ ^ 16>2_18 4 (mean -., . , j n^ i j 17.5) long; blade long, slender and pointed, Materials and Methods j , &. , ., . , -, , ^ i I guard shorter and thick, and handle very short The fixing fluid used is unknown. Specimens and slightly upturned terminally. Genital pores were stained in Semicorm's acid carmine and unilateral, slightly posterior to middle of margin mounted in Permount. Illustrations were made of proglottid. Cirrus not extruded and details with the aid of a camera lucida. Measurements of its structure not ascertained. Excretory in the text are given in micrometers except when canals1 not seen" J*™8 sac slightlv S shaPed> , . -. ., extending externally from near anterior margin stated otherwise. £ i ... i . .. i Or> T?A t \r proglottid to genital pore, 80—154 long by 0. , , .. /c. ,7T ,• v 27—80 wide; testes 1 poral and 2 aporal to Staphylocystis (Staphylocystis) j -j. n- i j j^j ^ 1 J J . r J J ovary and vitelline gland and tandem, oval, suncusensis sp. n. „ / , . fo . , ..' 1 53-160 long by 32-64 wide. Ovary small, DESCRIPTION: Characters of the genus. 18-27 by 18-29, located at anterior margin of Strobila 6.4-18.2 mm long, with five worms 2 posterior testes; vitelline gland posterior to Copyright © 2011, The Helminthological Society of Washington OF WASHINGTON, VOLUME 45, NUMBER 2, JULY 1978 183 ovary, 32-69 long by 24-35 wide. Gravid the number of proglottids that might be con- uterus saccate, fills proglottid. Eggs 29-40 sidered in the category of small, as he used it. long by 20-32 wide. Yamaguti (1959) divided the genus Staph- HOST: Suncus murinus Linnaeus, 1776. ylocystis Villot, 1877 into two subgenera. The SITE: Small intestine. subgenus Staphylocystis Villot, 1877, with LOCALITY: Wu Shi, Nantous Hsien, Taiwan. Hi/menolepis pistillum (Dujardin, 1845) as PARATYPES: USNM Helm. Coll. No. 74543. type, contains 16 species, 9 of the same ones HOLOTYPE: USNM Helm. Coll. No. 74657. included by Spassky (1945). The members of this subgenus include those species of the genus Discussion with one testis poral to the vitelline gland and two aporal. The species listed by Yamaguti The genus Staphylocystis was proposed by range from 0.6 mm long with as few as 10—12 Villot (1877a) for grapelike clusters of cysti- proglottids [S. (S.) pistillum (Duj. 1845)] to cercoids found in the millipede Glomeris 150 mm long and probably with hundreds of limbata Latreille. The cysticercoids are formed proglottids [S. (S.) bacillaris (Goeze, 1782)]. by successive branching and external prolifera- The subgenus Staphylocystoides Yamaguti, tion of secondary ones. There is no external 1959, with Hymenolepis sphenomorphus Locker membrane enclosing the cluster (Ransom, 1904; and Rausch, 1952, as type, contain six species. Wardle and McLeod, 1952) as distinct from The subgenus is characterized by two testes Coenums and Echinococcus with internal bud- being poral to the vitelline gland and one aporal. ding and external enclosing membrane. From They range in size from 0.475 mm long with these clusters of cysticercoids, Villot (1877a) 7-10 proglottids [S. (S.) parvissima (Voge, described S. bilarius from the Malpighian 1953)] to 20 mm long with 158 recognizable tubules, and later (1877b) S. micracanthus proglottids [S. (S.) sengeri (Neiland, 1953)]. from the fat bodies. In a subsequent paper Yamaguti's (1959) description of the genus (1877c), he recognized S. bilarius as the cysti- varies from that of Spassky (1954) in such a cercoids of Taenia scutigera Dujardin, 1845 and manner as to be inconsistent with the species T. scalaris Dujardin, 1845, and S. micracanthus that he (Yamaguti) included. He stated that as Taenia pistillum Dujardin, 1845. the species are "small worms," as did Spassky, Joyeux and Baer (1935) demonstrated ex- but added "proglottides not numerous . ," perimentally that S. micracanthus Villot, 1877a which statement Spassky's description does not develops into Hymenolepis pistillum (Dujardin, include. These two statements by Yamaguti are 1845). contradictory and meaningless when S. (S.) Hughes (1940) pointed out that the genus pistillum and S. (S.) bacillaris as extremes, Hymenolepis contained 320 recognized species. with intermediaries of short and long lengths, He (1941) prepared a key, acknowledged as are included. Yamaguti's description of the not entirely reliable, together with figures from gravid uterus is "horseshoe-shaped ... or a the literature of the rostellar hooks of the simple sac." Since both authors included some species. species with a horseshoe-shaped uterus and Skrjabin and Matevosyan (1948) reproduced others with a sac-shaped uterus, this change by from the original literature specific descriptions Yamaguti appears logical. and figures of the species of Hymenolepididae Because of the discrepancy between Yama- reported from mammals. guti's (1959) description of the genus and Spassky (1950) pointed out that inasmuch the number of proglottids in the species, it is as Staphylocystis micracanthus Villot, 1877 is a emended as follows to rectify the inconsistency. synonym of Taenia pistillum Dujardin, 1845, it shall be regarded as the genotype of Staphylo- Staphylocystis Villot, 1877 emended cystis, i.e., S. pistillum (Dujardin, 1845). In his classification of the hymcnolepidid HYMENOLEPIDINAE : Small to medium-sized cestodes of mammals, Spassky (1954) pro- worms with very few to many proglottids. vided a description of the genus Staphylo- Rostellum well developed, with rostellar sheath cystis. In it he pointed out that the species and a crown of 8—10 or more hooks; guard and are small tapeworms but gave no indication of blade of hook well developed. Proglottids Copyright © 2011, The Helminthological Society of Washington 184 PROCEEDINGS OF THE HELMINTHOLOGICAL SOCIETY owo Copyright © 2011, The Helminthological Society of Washington OF WASHINGTON, VOLUME 45, NUMBER 2, JULY 1978 185 elongated transversely, trapezoidal or almost handle (Fig. 15) and S. (S.) solitaria Meggitt quadrate in mature and gravid ones. Excretory (1927), also from Crocidura murina from stems of 2 pairs; inner longitudinal muscle Rangoon with 16 hooks 16-17 ^ long, whose bundles of four pairs. Testes 3, in a triangle guard is massive in comparison to the blade or or transverse row; 1 poral, 2 antiporal, to handle (Fig. 21). Further differentiation from vitelline gland, or vice versa. Cirrus pouch may other species may be made with the aid of or may not reach median line. External and the key that follows. internal seminal vesicle present. Accessory sac On the basis of the small strobila and the and stylet absent. Ovary compact or slightly arrangement of the testes with two being poral lobed, median or submedian; vitelline gland to the vitelline gland and one aporal, Hymeno- median or submedian. Uterus horseshoe lepis asketus Brooks and Mayes, 1977, from the shaped, with apex directed forwards, or a short-tailed shrew, Blarina brevicauda, is trans- simple sac. Parasites of Insectivora or Chirop- ferred to S. (Staphylocystoides). tera. GENOTYPE: Staphylocystis pistillum (Du- Key to the Species of the Genus jardin, 1845) Spassky, 1954. Staphylocystis Villot, 1877 Not conforming to the generic description of Staphylocystis in the large size of the strobilae 1.
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