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Glanidium bockmanni  Sarmento-Soares & Buckup, 2005

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Glanidium bockmanni
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drawing shows typical fish in this Family.

Classification / Names Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (ray-finned fishes) > Siluriformes (Catfish) > Auchenipteridae (Driftwood catfishes) > Centromochlinae
Etymology: Glanidium: Diminutive of Greek, glanis = a fish that can eat the bait without touching the hook; a cat fish (Ref. 45335);  bockmanni: Named for Flávio Alicino Bockmann, Universidade de São Paulo, who collected the specimens that led us to the recognition of the species as an undescribed species.

Environment / Climate / Range Ecology

Freshwater; demersal; depth range 0 - 2 m (Ref. 56311).   Tropical

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

South America: Brazil.

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 4.8 cm SL male/unsexed; (Ref. 56311)

Short description Morphology | Morphometrics

Dorsal spines (total): 1; Dorsal soft rays (total): 5. Diagnosis: This species is distinguished from its congeners by the autapomorphic reduced ossified suprapreopercular canal. In auchenipterids the suprapreopercle is a short canal bone lying above the preopercle and containing the dorsal end of the opercular lateral line canal, which passes through it and enters the pterotic; and among centromochlines, this canal bone may vary. In some forms (as in Centromochlus perugiae, C. heckelii, and C. existimatus, a suprapreopercular ossification is absent, but in most forms it is present as a tube, completing the space between preopercle and the pterotic. In G. bockmanni, the suprapreopercle is not represented as a tube. This small canal bone is an incompletely ossified tube between the preopercle and the pterotic, with the bony portion located close to the preopercle. A fully ossified suprapreopercle was not detected in G. bockmanni. Glanidium bockmanni further differs from its congeners (albescens, ribeiroi, catharinensis, melanopterum, and leapardus in having a small adult size 29-48 mm SL (vs. 70-195 mm SL); lower jaw of equal size (vs. slightly prognathous); first nuchal plate absent (vs. present); low number of vertebrae 32 (vs. 3440); anal fin with 7 branched rays (vs. 8-11); and a less voluminous muscle adductor mandibulae A2 associated with a discrete concavity between sphenotic and pterotic (vs. thickened A2 associated with a quite pronounced concavity). It very closely resembles G. cesarpintoi , but can be distinguished from it due to larger post-cleithral process (20% SL vs. 16% SL); shorter mesethmoid (15% HL vs. 25% HL); adipose fin present (vs. absent); and pectoral-fin spine with antrorse spinules on anterior margin (vs. retrorse in cesarpintoi) (Ref. 56311).

Biology     Glossary (e.g. epibenthic)

The single specimen was captured in an area with gravel and rocky bottom, near the margin of the river (F. Bockmann, pers. comm.). The fishes from Bahia were captured by seine at night in a riverine beach in clear, shallow water with sand and gravel bottom in depth less than 1.70 m. Stomach contents of two specimens were partially digested fragments of insect larvae and nymphs (Ref. 56311).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator : Ferraris, Jr., Carl J. | Collaborators

Sarmento-Soares, L.M. and P.A. Buckup, 2005. A new Glanidium from the Rio São Francisco Basin, Brazil (Siluriformes: Auchenipteridae: Centromochlinae). Copeia 2005(4):846-853. (Ref. 56311)

IUCN Red List Status (Ref. 115185)

CITES (Ref. 115941)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless




Human uses

FAO(Publication : search) | FishSource |

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Aquatic Commons | BHL | Cloffa | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes (gen., sp.) | DiscoverLife | ECOTOX | Faunafri | Fishtrace | GenBank(genome, nucleotide) | GloBI | GOBASE | | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Scirus | SeaLifeBase | Tree of Life | Wikipedia(Go, Search) | World Records Freshwater Fishing | Zoobank | Zoological Record

Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00468 (0.00183 - 0.01196), b=3.12 (2.90 - 3.34), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
Trophic Level (Ref. 69278):  3.2   ±0.4 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278):  High, minimum population doubling time less than 15 months ().
Vulnerability (Ref. 59153):  Low vulnerability (10 of 100) .