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Zawadzki et al (3)

Description: Dorsal spines (total): 2; Dorsal soft rays (total): 7; Anal soft rays: 4. This species is distinguished by the following characters: high number of teeth on premaxillary (60-110) and dentary (65-115); teeth bicuspid, with asymmetric cusps; eyes small, orbital diameter 12.7-17.2% in HL and 27.8- 45.6% in interobital width; abdominal platelets more clustered on laterals of abdomen; one predorsal plate bordering supraoccipital; no hypertrophied odontodes on flanks. The Hypostomus genus has 7 rays to the dorsal fin whereas the similar looking Pterygoplichthys species have 10 dorsal fin rays. Colouration: dorsal and lateral body surfaces and fins light brown; head with very closely spaced small, dark spots; trunk with spots slightly larger than on head and forming somewhat longitudinal rows; interradial membranes of fins, except anal fin, with dark brown spots similar to those of the trunk forming 5-8 diagonal lines (from base to distal margin); anal fin light brown, spots, if present, faint and in low number; abdominal region light brown, with most individuals without spots on abdomen, some with dark brown spots irregularly scattered on entire abdomen; caudal peduncle without spots on its ventral surface. Aquarium Care: As with most of this genus, will do well in a larger aquarium, although this is one of the smaller species in the genera, and the aquarium well filtered. Water parameters can be quite diverse for this genera. Diet: Omnivore with a liking for green, tablet and frozen foods. Etymology: The specific name johnii: In honour of American geologist Orestes Saint John (1841–1921), who collected holotype during Thayer Expedition to Brazil (1865–1866).

None

Plecostomus johnii

Loricariidae

South America: Brazil, Parnaíba and São Francisco River basins. Type locality: Rio Puty und Rio Preto [Brazil].

11.0cm. (4½ins)

24-28°c (75-83°f.)

6.0-7.5.

Burgess, W.E., 1989. An atlas of freshwater and marine catfishes. A preliminary survey of the Siluriformes. T.F.H. Publications, Inc., Neptune City, New Jersey (USA). 784 p.
Ferraris, C.J. Jr., 2007. Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types. Zootaxa 1418:1-628.
Froese, R. and D. Pauly. Editors. 2022. FishBase. World Wide Web electronic publication. www.fishbase.org, ( 02/2022 ).
Lustosa-Costa SY, Ramos TPA, Zawadzki CH, Lima SMQ. Review of the armoured catfish genus Hypostomus (Siluriformes: Loricariidae) from the Parnaíba River basin, Northeastern Brazil, with description of a new species. Neotrop Ichthyol. 2022.
Perez, A. 2023. Hypostomus johnii. The IUCN Red List of Threatened Species 2023.
Seidel, I. 2008. Back to Nature guide to L-catfishes, Ettlingen, Germany 208 p.
The ETYFish Project Fish Name Etymology Database © Christopher Scharpf.