Cat-eLog Right Arrow Loricariidae Right Arrow Hypostominae Right Arrow Baryancistrus

Jump to next section Cat-eLog Data Sheet
Scientific Name Baryancistrus demantoides  Werneke, Sabaj Pérez, Lujan & Armbruster, 2005
Common Names L200, Hi Fin Green Phantom Pleco
Type Locality Rio Ventuari near ornamental fish market in river, 04.07565°N, 066.89285°W, Amazonas, Venezuela.
Pronunciation bah ree ann siss truss - dee man toy dees
Etymology Greek, barys = heavy + Greek, agkistron = hook - Essentially "Heavy Ancistrus". The specific name refers to a demantoid, a type of garnet that ranges in color from yellowish green to brownish green and it is in reference to the color of the fish. The word comes from the obsolete German word diemant meaning diamond and the Greek suffix -oïdes meaning to resemble
Jump to next section Species Information
Size 150mm or 5.9" SL. Find near, nearer or same sized spp.
Identification The colouration of this fish can only really be confused with Hemiancistrus subviridis. The key to tell these two apart is that the dorsal fin and the adipose fin are connected in this species, and separated in the Hemiancistrus species. Furthermore, have a look at the shape of the mouth. H. subviridis has a almost perfectly round mouth, while B. demantoides shows a more rectangular mouth.
On a more technical side, this is the keys to distinquish the fish from original species description: Baryancistrus demantoides can be distinguished from all other Loricariids except Baryancistrus niveatus, Parancistrus, and Spectracanthicus by having the dorsal and adipose fins connected by an expanded posterior section of the dorsal-fin membrane. Baryancistrus demantoides can be separated from the other species with connected dorsal fins by having a yellow-olive color with white or cream colored spots (vs. typically dark with white, gold, or no spots); from other Baryancistrus with the dorsal fins connected by having the spots only on the anterior portion on the body (vs. all over), from Parancistrus by not being dorsoventrally flattened, and from Spectracanthicus by having greater than 30 teeth per jaw ramus (vs. less than 25). There is one other described species of Baryancistrus (B. longipinnis) that has an expanded posterior membrane of the dorsal fin, but the membrane does not connect to the adipose fin as in B. demantoides and B. longipinnis lacks light spots.
Sexing Mature males have broader head and more notable odontodes at the cheek and pectoral fins.
Jump to next section Habitat Information
Distribution Río Orinoco at its confluence with the río Ventuari and the lower río Ventuari upstream into the río Guapuchi.
Orinoco (click on these areas to find other species found there)
Orinoco, Upper Orinoco, Ventuari (click on these areas to find other species found there)
Orinoco, Upper Orinoco, Ventuari, Guapuchi (click on these areas to find other species found there)

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IUCN Red List Category Near Threatened, range map and more is available on the IUCN species page. Last assessed 2019.
pH 6.0 - 7.8
Temperature 24.0-27.0°C or 75.2-80.6°F (Show species within this range)
Jump to next section Husbandry Information
Feeding Should be fed a mainly vegetarian diet, with plenty of fibre in the diet. Algae wafers as well as fresh vegetables such as courgette (zucchini) and tubers such as potato and sweet potato are good foods.
Furniture In nature they are found on granite rocks, so a tank decorated with smooth rocks would be suitable.
Compatibility Peaceful, but can be mildly territorial.
Suggested Tankmates Suitable with most small to medium sized peaceful fish.
Breeding Unreported.
Breeding Reports There is no breeding report.
Jump to next section Further Information
Reference Neotropical Ichthyology v. 3 (no. 4), pp 535, Figs. 1a,b, 2.
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Last Update 2019 Oct 08 11:28 (species record created: 2005 Dec 22 00:00)