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Sinogastromyzon wui FANG, 1930

March 13th, 2012 — 1:26pm

This species is probably the most common member of the genus in the aquarium trade but still not often exported in numbers.

Instead it’s more often found in mixed shipments of other wild-collected fishes from southern China, particularly Beaufortia or Pseudogastromyzon spp.

It may appear superficially simi…

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Parabotia fasciata DABRY DE THIERSANT, 1872

March 13th, 2012 — 1:26pm

P. fasciata is rarely seen in the trade and is typically available only as bycatch among shipments of Sinibotia spp., particularly S. robusta. According to current classification numerous species from several genera are considered synonymous with it.

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Sinogastromyzon puliensis LIANG, 1974

March 13th, 2012 — 1:26pm

This species is a relatively recent addition to the hobby but considering the number of specimens allowed to be collected for scientific research is highly restricted by the Taiwanese Council for Agriculture it seems odd that it's become available at all. Indeed it appears that those in the trade are collected and exported on an illegal basis (T-Y Liao, pers. comm.)…

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Sewellia elongata ROBERTS, 1998

March 13th, 2012 — 1:26pm

This species appeared in the trade during 2010 and its identity has been confirmed to us by Thai exporter and aquarist Kamphol Udomritthiruj who collects it from the Se Kong system for the aquarium hobby. To date only subadult specimens have reached the western market.

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Sewellia sp. 'SEW03'

March 13th, 2012 — 1:26pm

This fish first became available in early 2009 and was initially identified as S. breviventralis (Freyhof and Serov, 2000).

However it cannot be that species because there is no discernible gap between pelvic and anal fins, which also discounts the possibility of it being S. elongata (Roberts, 1998). It therefore remains unidentified and is often imported in mixed batches with S. sp. ‘SEW02’, which it also resembles closely.

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Sewellia sp. 'SEW04'

March 13th, 2012 — 1:26pm

This fish has thus far only been imported among shipments of S. sp. ‘SEW02’ and S. sp. ‘SEW03’. It doesn’t appear to correspond to any known member of the genus and may be undescribed.

Prior to the mid-1990s S. lineolata was the only species in the genus but an upturn in surveys of fresh water fauna in Vietnam and Laos has resulted in the discovery of various new taxa, several of which remain undescribed.

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Sewellia sp. 'SEW01'

Spotted Butterfly Loach

March 13th, 2012 — 1:25pm

This is one of the more readily-available members of the genus and popularly referred to as S. sp. 'spotted' or S. sp. 'special'. It's superficially similar in appearance to S. albisuera but in that species body patterning consists of a network of irregular dark lines forming a complicated series of reticulations vs. many small, light spots on a dark background in S. sp. 'SEW01'.

It's been suggested that these two may represent the same species but this…

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Sewellia sp. 'SEW02'

March 13th, 2012 — 1:25pm

This species first became available in early 2009 and was initially identified as S. breviventralis (Freyhof and Serov, 2000) because there is a clear space between the pelvic and anal fins and body patterning is vaguely similar to that species, and also appears quite similar to S. elongata (Roberts, 1998) and S. sp. ‘SEW03’.

It does not fully match the original descriptions of either, however, and therefore remains in need of identification.

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Sewellia speciosa ROBERTS, 1998

March 13th, 2012 — 1:25pm

This species first became available in early 2010 and sometimes appears on trade lists under the vernacular names 'Laos sucker' or 'Laos Sakura sucker'.

It's distinguishable from other members of the genus by the following combination of characters: body spotted and without stripes; no concentric bands on paired fins; origin of pelvic-fin below origin of dorsal-fin; origin of pectoral-fin posterior to corner of mouth; pelvic fin reaching origin of anal fin; small elevated …

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Sewellia lineolata (VALENCIENNES, 1846)

Tiger Hillstream Loach

March 13th, 2012 — 1:25pm

S. lineolata was first recorded by Diard over 150 years prior to its 'rediscovery' in the early-1990s. It became available to the aquarium trade in the mid-2000s and swiftly established itself as one of the more popular balitorids in the hobby due to its attractive body markings and ease of breeding. It's also sold under the names 'reticulated hillstream loach', 'Vietnamese hillstream loach' and 'gold ring butterfly sucker'.

It's difficult to…

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