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Nathan Lujan (1)

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, and I. villarsi (Ray & 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. Remarks: Found on some online sources as Squaliforma tenuicauda but listed as the current status of Isorineloricaria tenuicauda in Eschmeyer's Catalog of Fishes.

None

Plecostomus tenuicauda, Squaliforma tenuicauda, Hypostomus tenuicauda.

Loricariidae

South America: Colombia, Caribbean Rivers, Magdalena. Type locality: Río Magdalena.

40.0cm. (16ins)

25-29°c (77-85°f.)

6.0-7.5.

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.