Placobdelloides siamensis is a species of blood-feeding jawless leech in the family Glossiphoniidae.[1][2] It is commonly known as the Siam shield leech and is a prevalent ectoparasite on Malayemys turtles but has a range of Geoemydidae hosts. In high numbers it can cause severe anaemia and malnutrition which can lead to the death of its host.[3]
| Placobdelloides siamensis | |
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| Placobdelloides siamensis: left, dorsal view; right: ventral view. | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Annelida |
| Clade: | Pleistoannelida |
| Clade: | Sedentaria |
| Class: | Clitellata |
| Subclass: | Hirudinea |
| Order: | Rhynchobdellida |
| Family: | Glossiphoniidae |
| Genus: | Placobdelloides |
| Species: | P. siamensis
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| Binomial name | |
| Placobdelloides siamensis (Oka, 1917) Sawyer, 1986
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| Synonyms | |
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Taxonomy
editThe species was first described as Hemiclepsis siamensis by Oka in 1917[1] then transferred by Sawyer to his new genus Placobdelloides in 1986.[2] In 2018, it was redescribed from specimens collected in Thailand.[4]
Hosts
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The type host is the Black Marsh Turtle, Siebenrockiella crassicollis. Other hosts include the Southeast Asian Box Turtle, Cuora amboinensis, the Yellow-headed Temple Turtle, Heosemys annandalii, the Mekong Snail-eating Turtle Malayemys subtrijuga, the Malayan Snail-eating Turtle Malayemys macrocephala, the Khorat Snail-eating Turtle Malayemys khoratensis, Oldham's lead turtle Cyclemys oldhamii and the giant Asian pond turtle Heosemys grandis.[3]
References
edit- ^ a b Oka, A. 1917. Zoological Results of a Tour in the Far East, pt. III. Hirudinea. Memoirs of the Asiatic Society of Bengal, VI, pp. 157-176, pl. VII.
- ^ a b Sawyer, R.T. 1986: Leech biology and behaviour. Volume II. Feeding biology, ecology, and systematics. Clarendon Press, Oxford.
- ^ a b Trivalairat, Poramad; Chiangkul, Krittiya; Purivirojkul, Watchariya (2020-10-26). "Parasitism of Placobdelloides siamensis (Oka, 1917) (Glossiphoniidae: Hirudinea) in Snail-eating Turtles, Malayemys spp., and the effects of host and aquatic environmental factors". Biodiversity Data Journal. 8 (e57237). doi:10.3897/BDJ.8.e57237. PMID 33192153. Retrieved 2020-10-30.
this study also showed two new hosts, including Cyclemys oldhamii and Heosemys grandis
- ^ Chiangkul, Krittiya; Trivalairat, Poramad; Purivirojkul, Watchariya (2018). "Redescription of the Siamese shield leech Placobdelloides siamensis with new host species and geographic range". Parasite. 25: 56. doi:10.1051/parasite/2018056. ISSN 1776-1042. PMC 6254108. PMID 30474597.
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