| Kingdom | Phylum | Class | Order | Family |
|---|---|---|---|---|
| ANIMALIA | CHORDATA | ACTINOPTERYGII | SILURIFORMES | SCHILBEIDAE |
| Scientific Name: | Platytropius siamensis |
| Species Authority: | (Sauvage, 1883) |
| Synonym/s: |
Nemasiluroides furcatus Fowler, 1937
Pseudeutropius siamensis Sauvage, 1883
|
| Taxonomic Notes: | Platytropius siamensis was described from the Chao Phraya River in Bangkok (Sauvage 1883) as a species of Pseudeutropius. Hora (1937) subsequently erected the genus Platytropius for this species. |
| Red List Category & Criteria: | Extinct ver 3.1 |
| Year Published: | 2011 |
| Assessor/s: | Ng, H.H. |
| Reviewer/s: | Rainboth, W., Kullander, S.O., Vidthayanon, C. & Allen, D. |
|
Justification: This species has not been encountered since 1975–1977 (C. Vidthayanon, pers. comm.), despite periodic surveys undertaken within the Chao Phraya and Bang Pakong river drainages. Because of the complete absence of evidence that any individuals of this species can still be found either in the wild or as captive populations, this species is assessed as Extinct. |
|
| Range Description: | This species was known from the Chao Phraya and Bang Pakong river drainages in Thailand (Smith 1945). Although there have been numerous general fish surveys in the drainages where the species had been recorded, this species has not been encountered since 1975–1977. |
| Countries: |
Regionally extinct:
Thailand
|
| Range Map: | Click here to open the map viewer and explore range. |
| Population: | This species was still abundant in the Chao Phraya (and possibly Bang Pakong) River drainage in the 1920s (Smith 1945), but is now considered extinct, as no individuals have been encountered since 1975–1977 (from specimens seen from Ayutthaya; specimens at Thai Department of Fisheries (C. Vidthayanon pers. comm. 2011)) in spite of numerous surveys within the Chao Phraya River drainage and areas where this species has been historically reported. The Bang Pakong has also been extensively surveyed over the period 1990–2000 (C. Vidthayanon, pers. comm. 2011), and the species has not been recorded, nor do fishers report the species. |
| Habitat and Ecology: | This species was previously found in the main channels of rivers and larger streams. It might have also been found in large swamps and marshes, although all known museum records of this species come from material collected in fluviatile systems. |
| Systems: | Freshwater |
| Major Threat(s): | This species is believed to have gone extinct as a result of damming and canalization of the Chao Phraya River (Harrison and Stiassny 1999), as well as extensive reclamation of wetlands around Bangkok and the known range of the species. In addition, the lower parts of both rivers are very highly polluted. |
| Conservation Actions: | None needed, as this species is considered extinct. |
| Citation: | Ng, H.H. 2011. Platytropius siamensis. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. <www.iucnredlist.org>. Downloaded on 24 May 2012. |
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