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Down arrow Cat-eLog Data Sheet
Scientific Name Otocinclus macrospilus  Eigenmann & Allen, 1942
Common Names Dwarf Otocinclus
Dwarf Sucker, Oto
Type Locality Río Morona, upper Amazon River basin, Dpto Loreto, Peru.
Pronunciation auto SINK luss - MAK ro spill us
Etymology Greek, ous, oto = ear + Latin, cinclus = latticework; in allusion to the holes of the head in the ears. 
Articles
Article Link - Shane's World Catfishology Otocinclus - ''Little Monkeys'' in the planted aquarium
Down arrow Species Information
Size 34mm or 1.3" SL. Find near, nearer or same sized spp.
Identification Similar in overall colouration to O. vestitus. The caudal fin marking is key to separating this species of Otocinclus from the others. In O. macrospilus the lateral black stripe stops or becomes pale before the tail blotch, which can look like a fat spindle or diamond as it crosses into the tail proper.
Sexing Females are larger and broader especially when viewed from above.
Down arrow Habitat Information
Distribution Upper Amazon Basin of Colombia, Ecuador & Peru
Amazon, Upper Amazon (click on these areas to find other species found there)

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pH 5.5 - 7.5
Temperature 21.0-26.0°C or 69.8-78.8°F (Show species within this range)
Down arrow Husbandry Information
Feeding Initially algae, add a shoal to an ''algaefied'' tank and then supplement diet with sinking tablets and the usual cucumbers / lettuce or courgette (zucchini).
Furniture Large leafed plants and vertical flat rock surfaces (especially slate). Not essential, but likes bogwood and a large rounded substrate. Live plants seem essential to the long term survival of this fish.
Compatibility Peaceful.
Suggested Tankmates Keep in groups (preferably at least six) with any small to mid-sized community fish.
Breeding See Shane's World Article
Breeding Reports There is no breeding report.
Down arrow Further Information
Reference Fishes of western South America, pp 201, Pl. 13 (fig. 1).
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Last Update 2019 Sep 14 03:47 (species record created: 2001 Apr 14 00:00)