Classification / Names
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Siluriformes (Catfishes) >
Doradidae (Thorny catfishes) > Doradinae
Etymology: Ossancora: Derived from the Latin oss, meaning bone, and ancora, meaning anchor, in reference to the shape and articulation of the pectoral spine and posterior cleithral and coracoid processes which resemble the shank and flukes, respectively, of a Danforth anchor; asterophysa: Specific name is derived from the Greek aster, meaning star, and physa, meaning bladder, alluding to the proliferation of diverticula along the periphery of the gas bladder which distinguishes species from Ossancora eigenmanni. An adjective.
Environment: milieu / climate zone / distribuzione batimetrica / distribution range
Ecologia
; acqua dolce demersale. Tropical
South America: Amazonas basin in Bolivia, Brazil and Peru; Ilha do Marajó near the mouth of the rio Amazonas to laguna Yarinacocha, an oxbow lake connected to the río Ucayali; río Mamoré and upper Guaporé, Madeira drainage.
Size / Peso / Age
Maturità: Lm ? range ? - ? cm
Max length : 16.8 cm TL maschio/sesso non determinato; (Ref. 111518); peso massimo pubblicato: 62.00 g (Ref. 111518)
Short description
Chiavi di identificazione | Morfologia | Morfometria
Spine dorsali (totale) : 2; Raggi dorsali molli (totale) : 6. Can be diagnosed from Ossancora punctata by having maxillary barbel with elongate fimbriae inserted in two distinct rows along anterior margin, one dorsally and one ventrally, mental barbels with elongate fimbriae, and anterior nuchal plate reduced, diamond shaped, not sutured to epioccipital. Can be distinguished from Ossancora eigenmanni and Ossancora fimbriata by having the unique combination of gas bladder with numerous diverticula that are thin, moderately elongate (often branched), and grouped in roughly paired, small fascicles along the periphery of anterior face, shoulder and lateral walls of anterior chamber as well as lateral walls and posterior face of posterior chambers (vs. peripheral diverticula absent or few, restricted to anterolateral shoulder and sometimes anterior face of the anterior chamber in Ossancora eigenmanni; terminal diverticula lacking or indistinguishable from other peripheral diverticula (vs. short terminal diverticula present in Ossancora fimbriata; infranuchal plate not greatly expanded ventrally (vs. greatly expanded ventrally, reaching level of posterior coracoid process in adults in Ossancora fimbriata); nuchal foramina absent (vs. usually present, except in some large adults, in Ossancora fimbriata); less than 20 teeth per ramus on premaxilla and dentary (vs. 25-50 in Ossancora fimbriata); mental barbel with elongate fimbriae in single row (vs. two rows in Ossancora fimbriata) (Ref. 92411).
Life cycle and mating behavior
Maturità | Riproduzione | Deposizione | Uova | Fecundity | Larve
Birindelli, J.L.O., 2011. Ossancora, new genus of thorny catfish (Teleostei: Siluriformes: Doradidae) with description of one new species. Proc. Acad. Nat. Sci. Phila. 161:117-152. (Ref. 92411)
IUCN Red List Status (Ref. 130435: Version 2025-1)
Threat to humans
Harmless
Human uses
Strumenti
Special reports
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Estimates based on models
Phylogenetic diversity index (Fonte Biblio.
82804): PD
50 = 0.5625 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01047 (0.00604 - 0.01816), b=2.97 (2.82 - 3.12), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245).
Trophic level (Fonte Biblio.
69278): 2.8 ±0.4 se; based on size and trophs of closest relatives
Resilienza (Fonte Biblio.
120179): Alto, tempo minimo di raddoppiamento della popolazione meno di 15 mesi (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
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