biology

Peckoltia

Peckoltia is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Peckoltia rather than just read about it. In short: Peckoltia is a genus of freshwater ray-finned fishes belonging to the family Loricariidae, the suckermouth armored catfishes, and the subfamily Hypostominae, the suckermouth catfishes. The catfishes on this genus are found in South America.

Key takeaways

Peckoltia belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Peckoltia to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Peckoltia from memory before moving on to harder problems.

Reference excerpt

Peckoltia is a genus of freshwater ray-finned fishes belonging to the family Loricariidae, the suckermouth armored catfishes, and the subfamily Hypostominae, the suckermouth catfishes. The catfishes on this genus are found in South America. Many of these fish are popular aquarium fish.

Taxonomy Peckoltia was first proposed as a genus in 1917 by the Brazilian zoologist Alípio de Miranda Ribeiro, in 1945 William Alonzo Gosline designated Chaetostomus vittatus as the type species of the genus. C, vittatus was first formally described in 1881 by Franz Steindachner with its type locality given as the "Amazon River, Tajapouru, Xingu near Moz Port, Rio Madeira, Brazil". Some authorities regard this genus as being within the tribe Ancistrini of the subfamily Hypostominae, but Eschmeyer's Catalog of Fishes does not recognise tribes within the subfamily Hypostominae. Peckoltia is sometimes considered to be a basal genus within the tribe Ancistrini of the subfamily Hypostominae. This genus is paraphyletic. However, other studies resolve this taxon as incertae sedis within Hypostominae. At this point, many undescribed species remain. Many of the possibly undescribed species have an identification through the L-number system. Peckoltia species can be distinguished from most other in the genera in the tribe Ancistrini by having a lateral ridge on the opercle that usually has no odontodes and the teeth on their upper jaw (dentary) forming an angle under 90 degrees; while some genera also have an angled dentary, Peckoltia species lack synapomorphies of these genera. This genus and the closely related Hemiancistrus may be synonymous, as neither genus is supported by synapomorphies. Generally, Peckoltia are considered to be those that have dorsal saddles and bands in the fins, while Heminancistrus have spots and uniform coloration. This genus is also similar to Hypancistrus and Panaque except for differences in teeth. Teeth on both jaws are the same size as opposed to different sizes, which is different from Hypancistrus where the upper jaw teeth are larger. Also, the teeth are villiform (brush-shaped) rather than spoon-shaped, in contrast to the Panaque. The classification of some of the species in this genus has been confused. P. yaravi has been moved to Neblinichthys. P. sabaji was arbitrarily placed in this genus (as opposed to Hemiancistrus), but may even represent its own genus; later, it has been placed in Hemiancistrus but (Armbruster et al. 2015) placed the species in the genus Peckoltia. Peckoltia bachi is placed in the genus Peckoltichthys and Peckoltia snethlageae and Peckoltia feldbergae are placed in the genus Ancistomus.

Etymology Peckoltia honors the Brazilian-born German botanist and pharmacist Gustavo Peckolt who published a book on Brazilian plants with his father and was a member of the Natural History Commission of Rondônia.

Species

Peckoltia contains the following valid species:

Peckoltia amjikin de Araújo, Ferreira, Silva & Wosiacki, 2025 Peckoltia braueri (C. H. Eigenmann, 1912) (Worm-line peckoltia) Peckoltia brevis (La Monte, 1935) Peckoltia caenosa Armbruster, 2008 Peckoltia capitulata Fisch-Muller & Covain, 2012 Peckoltia cavatica Armbruster & Werneke, 2005 Peckoltia compta R. R. de Oliveira, Zuanon, Rapp Py-Daniel & M. S. Rocha, 2010 Peckoltia ephippiata Armbruster, Werneke & M. Tan, 2015 Peckoltia furcata (Fowler, 1940) Peckoltia greedoi Armbruster, Werneke & M. Tan, 2015 Peckoltia lineola Armbruster, 2008 Peckoltia lujani Armbruster, Werneke & M. Tan, 2015 Peckoltia multispinis (Holly, 1929) (Bristle-mouth catfish) Peckoltia oligospila (Günther, 1864) Peckoltia otali Fisch-Muller & Covain, 2012 Peckoltia pankimpuju (Lujan & Chamon, 2008) Peckoltia relictum (Lujan, Armbruster & Rengifo, 2011) Peckoltia sabaji Armbruster, 2003 Peckoltia simulata Fisch-Muller & Covain, 2012 Peckoltia vermiculata (Steindachner, 1908) Peckoltia vittata (Steindachner, 1881) Peckoltia wernekei Armbruster & Lujan, 2016

Distribution and habitat Peckoltia inhabit freshwater habitats in the Amazon basin, upper Orinoco, upper Essequibo River, and also possibly the Maroni River, as well as coastal drainages north of the Amazon to French Guiana. Three species, P. braueri, P. cavatica and P. sabaji are found in the Guiana Shield. Peckoltia live in shallow, rocky riffles and in quieter water where they hide inside cavities in submerged logs.

Appearance and anatomy Peckoltia are members of the family Loricariidae, the armored suckermouth catfishes. As such, they have armor plating on their body instead of scales. Also, they have a suckermouth which they use to cling to rocks in their habitat. They have the characteristic Loricariid omega iris as well. Like many other catfish, Peckoltia have strong pectoral and dorsal fin spines that can be locked outwards as a defense. Peckoltia have unmodified teeth and the teeth on their upper jaw form an angle under 90 degrees. Most male Peckoltia have hypertrophied odontodes on their body during the breeding season. The biggest difference between all the Peckoltia species is coloration. They usually have a saddle-shaped marking on their back. However, P. caenosa are mottled. Four species, P. braueri, P. caenosa, P. cavatica and P. vittata, lack spots on their head while the rest have them. P. braueri and P. cavatica have orange bands in the dorsal and caudal fins and have the bones and plates of the head and nape outlined in black; in P. caenosa and P. vittata, there are no orange bands and head plates and bones are not outlined. P. caenosa has dark vermiculations on the head and abdomen. P. vittata has saddles or blotches on the head and faint dark spots on the abdomen. P. lineola and P. vermiculata have spots on their head that combine to form vermiculations. In P. lineola the spots form vermiculations that are wider than its pupils, while in P. vermiculata the spots form vermiculations narrower than its pupils; also, the vermiculations radiate from a central point on the head in P. vermiculata, while there is no such pattern in P. lineola.

In the aquarium True Peckoltia species are fairly rarely exported for the pet trade; species called Peckoltia may actually be Panaque or Hypancistrus species. Peckoltia species are popular aquarium fish as they are small and attractive. They are shy and will spend much of the day hiding. In 2013, aquarists reported breeding P. braueri in captivity for the first time.

References

Illustrations

Worked examples

Example 1 — a first encounter with Peckoltia

Start with the simplest possible case. Write down what Peckoltia claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Peckoltia before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Peckoltia ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Peckoltia

In research: Peckoltia appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Peckoltia in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Peckoltia is common in secondary-school and first-year university syllabi. It links to neighbouring topics Catfish genera, Fish of South America, Fishkeeping, so understanding it makes those chapters shorter.
In everyday life: Look for Peckoltia outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Peckoltia in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Peckoltia means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Peckoltia out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Peckoltia in simple terms?

Why does Peckoltia matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Peckoltia?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Peckoltia.