Placobdelloides siamensis

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
Placobdelloides siamensis: left, dorsal view; right: ventral view.
Scientific classification
Kingdom:
Animalia
Phylum:
Annelida
Class:
Clitellata
Subclass:
Hirudinea
Order:
Rhynchobdellida
Family:
Glossiphoniidae
Genus:
Placobdelloides
Binomial name
Placobdelloides siamensis
(Oka, 1917) Sawyer, 1986
Synonyms
  • Hemiclepsis siamensis Oka, 1917

Taxonomy

The 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
Placobdelloides siamensis on the carapace of Malayemys subtrijuga (arrows)

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
  1. 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.
  2. Sawyer, R.T. 1986: Leech biology and behaviour. Volume II. Feeding biology, ecology, and systematics. Clarendon Press, Oxford.
  3. 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. Retrieved 2020-10-30. this study also showed two new hosts, including Cyclemys oldhamii and Heosemys grandis
  4. 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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