Hyphessobrycon platyodus (Teleostei: Characiformes), a new species from the Rio Madeira basin, Brazil, with comments on how multicuspid teeth relate to feeding habits in Characidae

Abstract

A new species of Hyphessobrycon is described from the Rio Juma, a tributary of the lower Rio Aripuanã-Rio Madeira basin, Amazonas, Brazil. Hyphessobrycon platyodus can be distinguished from its congeners by the: presence of an elongated dorsal fin in adult males, 25-28 branched anal-fin rays and absence of dark blotches from the dorsal fin and caudal peduncle. The presence of multicuspid teeth in species of Characidae and its relation with feeding habits are briefly commented on.

On a remarkable sexual dimorphic trait in the Characiformes related to the olfactory organ and description of a new miniature species of Tyttobrycon Géry (Characiformes: Characidae)

“…Among fishes, sexual selection is responsible for the evolution of impressive morphological novelties. Specifically in the Characiformes, secondary sexual dimorphism is commonly associated to the occurrence of bony hooks on fins, breeding tubercles, gill glands, modified scales [2–10], shape and length of the dorsal, pelvic and anal fins [11–21], and sexual dichromatism [22,23].…”

Early ray‐finned herbivores: the dental system of Eurynotoidiidae (Actinopterygii; middle–late Permian, European Russia) and implications for palaeobiology and palaeoecology

“…The multicusped dental morphology of eurynotoidiforms is similar to Recent Cichlidae (Hulsey & Garc ıa de Le on 2005; Burress 2015; Tada et al 2017), Acanthuridae (Purcell & Bellwood 1993), Kyphosidae (Kanda & Yamaoka 1995), Cyprinodontidae (Lencer et al 2016), Characidae (Hirschmann et al 2017;Ohara et al 2017) and Serrasalmidae (Huie et al 2017). Because these are groups adapted for herbivorous feeding, a comparable niche could be inferred for the eurynotoidiforms.…”

A new species of Poptella (Characiformes: Characidae: Stethaprioninae) from the Rio Juma, Rio Madeira basin, Brazil

“…Ohara et al (2017) discussed that the fish endemism is not only characteristic to the upper portion of the Rio Aripuanã, as first discussed by Kullander (1995), but, actually, patchily distributed in its upper and middle portions. P. actenolepis, as several examples cited by Ohara et al (2017), is only known from its type locality, and most probably restricted to this area. Garcia-Ayala et al (2017) discussed that small bony hooks on all fins of adult males are present in Poptella compressa, P. brevispina, P. longipinnis, and in Brachychalcinus reisi.…”

“…In the Rio Madeira, it is known to occur only in its upper portion (Rio Guaporé and Rio Jamari). Poptella actenolepis is only known from the Rio Juma, a tributary of the the highly endemic Rio Aripuanã (see Kullander, 1995;Ohara et al, 2017). Ohara et al (2017) discussed that the fish endemism is not only characteristic to the upper portion of the Rio Aripuanã, as first discussed by Kullander (1995), but, actually, patchily distributed in its upper and middle portions.…”

“…Poptella actenolepis is only known from the Rio Juma, a tributary of the the highly endemic Rio Aripuanã (see Kullander, 1995;Ohara et al, 2017). Ohara et al (2017) discussed that the fish endemism is not only characteristic to the upper portion of the Rio Aripuanã, as first discussed by Kullander (1995), but, actually, patchily distributed in its upper and middle portions. P. actenolepis, as several examples cited by Ohara et al (2017), is only known from its type locality, and most probably restricted to this area.…”