SEVEN NEW YORKERIA SPECIES (CESTODA: TETRAPHYLLIDEA) FROM BORNEO AND AUSTRALIA AND THEIR IMPLICATIONS FOR IDENTIFICATION OF CHILOSCYLLIUM (ELASMOBRANCHII: ORECTOLOBIFORMES) SPECIES

• Published in: The Journal of parasitology Vol. 93; no. 2; pp. 357 - 376
• Main Authors: Caira, J. N, Jensen, K, Rajan, Chandrika
• Format: Journal Article
• Language: English
• Published: Lawrence, KS American Society of Parasitologists 01.04.2007; Allen Press Inc
• Subjects: Animals; Australia; Bamboo; Bamboos; Biological and medical sciences; Borneo; Cestoda; Cestoda - anatomy & histology; Cestoda - classification; Cestoda - ultrastructure; Cestode Infections - parasitology; Cestode Infections - veterinary; Chiloscyllium; Chiloscyllium indicum; Chiloscyllium punctatum; Elasmobranchii; Ethanol; Female; Females; Fish Diseases - parasitology; Follicles; Fundamental and applied biological sciences. Psychology; General aspects; General aspects and techniques. Study of several systematic groups. Models; Genitalia; Hooks; Host-Parasite Interactions; Invertebrates; Male; Males; Microscopy, Electron, Scanning - veterinary; Museums; Nemathelminthia. Plathelmintha; New species; Orectolobiformes; Ovaries; Parasite hosts; Pedicels; Peduncle; Physical characteristics; Scanning electron microscopy; Sharks; Sharks - classification; Sharks - parasitology; Species Specificity; SYSTEMATICS-PHYLOGENETICS; Testes; Tetraphyllidea; Vagina; Yorkeria; Borneo; Australia; Asia; Oceania; Canada; Sarawak Malaysia; Queensland Australia; Malaysia; India; ISEW, Borneo; Australia Coasts; ISEW, Thailand; Vertebrata; Taxonomy; Pisces; Helmintha; Plathelmintha; Diagnosis (taxonomy); Parasite; New species; Invertebrata; Cestoda; Chondrichthyes
• ISSN: 0022-3395; 1937-2345
• DOI: 10.1645/GE-801R.1

New material of YorkeriaSouthwell, 1927, collected from Chiloscyllium Müller & Henle species, i.e., bamboo sharks, from Malaysian Borneo and eastern Australia was found to include specimens that appear to be consistent with, and thus allow redescription of, the poorly characterized type of the genus, Yorkeria parvaSouthwell, 1927, as well as 7 new species of tetraphyllidean cestodes from the genus Yorkeria. Discovered in Borneo were Y. parva and Yorkeria teeveeyi n. sp. from Chiloscyllium indicum (Gmelin), Yorkeria garneri n. sp. from Chiloscyllium hasselti Bleeker, Yorkeria pusillulus n. sp., Yorkeria saliputium n. sp., and Yorkeria yubodohensis n. sp. from Chiloscyllium punctatum Müller & Henle. In Australia, a shark species tentatively identified as Chiloscyllium cf. punctatum was found to host Yorkeria izardi n. sp. and Yorkeria longstaffae n. sp. Three of the new species resemble Yorkeria kelleyaeCaira & Tracy, 2002, described from sharks identified as C. punctatum in Thailand, in their possession of medial and lateral hooks that are approximately equal in length. All 3 can be distinguished from Y. kelleyae, however, in their possession of vitelline follicles that are not interrupted at the level of the ovary; they differ from one another in that 1 is hyperapolytic (Y. saliputium n. sp.), and the other 2 possess round (Y. pusillulus n. sp.) versus tapered (Y. longstaffae n. sp.) bothridia. Among species with medial and lateral hooks that are conspicuously unequal in length, only Y. izardi n. sp. possesses bothridia that taper posteriorly and almost completely overlap the cephalic peduncle, stopping just short of its posterior margin. Yorkeria garneri n. sp. is distinctive in its possession of mature proglottids that are only slightly longer than wide, rather than distinctly longer than wide. Particularly notable is Y. teeveeyi n. sp., which bears a stobila on which 2–3 of the subterminal proglottids are consistently more mature than the terminal proglottid. Yorkeria yubodohensis n. sp. most closely resembles Y. parva, differing in the pattern of microtriches seen on its scolex, and also in its possession of relatively fewer proglottids. This brings the total number of Yorkeria species described worldwide to 12. The host associations of these cestodes raise questions about the conspecificity of bamboo shark specimens identified as C. punctatum in Thailand, Borneo, and Australia, since individuals in each of these 3 regions appear to host distinctive, nonoverlapping Yorkeria faunas. A key to the 12 known species of Yorkeria is provided.