We review the complex history
of those species included in the Hypostomus emarginatus
species complex and recognise them in Isorineloricaria
and Aphanotorulus. Isorineloricaria
consists of four valid species: I. acuarius
n. sp., I. spinosissima, I. tenuicauda,
& Armbruster 2016). Description:
Isorineloricaria tenuicauda can be diagnosed
from from I. acuarius by having a smaller
caudal peduncle width to pectoral spine length ratio
(31.5–56.2% vs. 59.6–65.2%), which separates
95% of individuals; from I. spinosissima
by having a larger caudal fin depth to head length
ratio (see diagnosis of I. spinosissima);
and from I. villarsi, by a rounded ridge
present on the compound pterotics (vs. sharp ridge).
Isorineloricaria tenuicauda can be further
diagnosed from Aphanotorulus ammophilus and
A. unicolor by a single, large buccal papillae
(vs. multiple buccal papillae); and from A. emarginatus
and A. horriddus by having rounded ridges
on the compound pterotics (vs flat compound pterotics)
(Ray & Armbruster 2016). Aquarium Care:
Non territorial and peaceful but they are messy eaters
and as such good water quality would need to be adhered
to. A large tank over 5ft (150cm) would be needed
due to the eventual adult size of this catfish. Diet:
Omnivore in the aquarium but prefers vegetable foods.
Found on some online sources as Squaliforma tenuicauda
but listed as the current status of Isorineloricaria
tenuicauda in Eschmeyer's
Catalog of Fishes.
Colombia, Caribbean Rivers, Magdalena. Type
locality: Río Magdalena.
Ray, C. Keith; Armbruster,
Jonathan W. 2016. The genera Isorineloricaria
and Aphanotorulus (Siluriformes: Loricariidae) with
description of a new species. Zootaxa, [S.l.], v.
4072, n. 5, p. 501–539, feb. 2016. ISSN 1175-5334.