Enregistré dans:
| Auteurs principaux: | , |
|---|---|
| Format: | Recurso digital |
| Langue: | |
| Publié: |
Zenodo
2010
|
| Sujets: | |
| Accès en ligne: | https://doi.org/10.5281/zenodo.6493718 |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
Table des matières:
- <p><b><i>Coptobrycon</i> Géry, 1966</b></p><p><b>Figs. 1-7</b></p><p><i>Coptobrycon</i> Géry, 1966: 226</p><p>(type-species: <i>Hasemania bilineata</i> Ellis, 1911, by original designation and monotypy).</p><p><b>Diagnosis.</b> <i>Coptobrycon</i> is easily distinguished from all other Characidae due to: a very peculiar dentary dentition, with only three, large, anterior, multicuspid and pedunculated, principal teeth in each half of the dentary (Fig. 5; <i>vs</i>. four or more conical or cuspidate and not pedunculated teeth, except in the Cheirodontinae and Iguanodectinae, which have more than four pedunculated teeth); the absence of the nasal bone (<i>vs</i>. present); the presence of a straight, dark brown stripe slightly above the base of the anal fin (Fig. 1), from vertical through its origin or slightly behind, continuing through the ventral portion of the caudal peduncle up to the base of the caudal fin (<i>vs</i>. absent). Furthermore, it can also be separated from all other Characidae, except <i>Grundulus</i>, by having the nasal pores separated by a non confluent space (Fig. 2; <i>vs</i>. nasal pores very close and confluent); infraorbitals 4 and 6 (5, sometimes) absent (Fig. 4; <i>vs</i>. present); infraorbital laterosensory canal greatly reduced, with pores inconspicuous or absent (Fig. 4; <i>vs</i>. present); supraorbital laterosensory canal absent in posterior portion of the frontal (<i>vs</i>. present). Other useful diagnostic characters include: up to six olfactory rosette lamellae, turned to the posterior portion of the nasal canal (Fig. 3; <i>vs</i>. more than ten lamellae, generally more than fifteen, concentrically arranged; except in <i>Grundulus</i> and <i>Xenurobrycon</i>); adipose fin absent (Fig. 1; <i>vs</i>. present; except in <i>Grundulus</i>, <i>Gymnocharacinus bergi</i>, <i>Hasemania</i>, some <i>Hyphessobrycon</i> species, and <i>Spintherobolus</i>).</p>