Insperanos, an unexpected new genus of Anostomidae (Characiformes) (project)

Sidlauskas, Brian L.; Assega, Fernando Massayuki; Melo, Bruno F.; Oliveira, Clarissa Tochetto de; Birindelli, José L. O.

doi:10.7934/p3894

MorphoBank Datasets 2021

DOI: 10.7934/p3894

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Insperanos, an unexpected new genus of Anostomidae (Characiformes) (project)

Brian L. Sidlauskas¹,

Fernando Massayuki Assega²,

Bruno F. Melo³

et al.

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Cited by 2 publications

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“…herbivorous feeding habits. It forms schools and undertakes reproductive migration at the end of the receding-water season (Santos et al, 2006;Sidlauskas & Birindelli, 2018). It spawns from January to April in association with rising water levels (Santos, 1980), resulting in many newly hatched individuals drifting in the Solimões/Amazonas river channel.…”

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Early ontogeny of the freshwater fish Rhytiodus microlepis (Characiformes, Anostomidae) from the Amazon basin

Santos,

Oliveira,

Silva

et al. 2024

Journal of Fish Biology

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The early development of the freshwater fish Rhytiodus microlepis is characterized by the description of external morphological, meristic, and morphometric changes, as well as the growth patterns, thereby establishing a reference for the identification of its larvae and juveniles. Specimens were collected from the Amazon river channel and floodplain. Ninety‐seven individuals were analysed with standard length varying between 4.31 and 79.23 mm. Rhytiodus microlepis larvae are altricial, with an elongated and fusiform body, anal opening reaching the middle region of the body, and simple nostrils becoming double and tubular during development. The pigments vary from one to two chromatophores in the dorsal region of the head in pre‐flexion and flexion, but later the pigmentation pattern intensifies, transverse bands appear along the body, and a conspicuous spot appears in the basal region of the caudal fin. The total number of myomeres ranges from 49 to 50. During the transition from larval (post‐flexion) to the juvenile periods, the most significant anatomical changes occur, such as the presence of all fins and increased body pigmentation. Integrated myomere count and pigmentation pattern are effective for the correct identification of the initial life stages of R. microlepis from the Amazon basin. Our results expand the knowledge about the early life history of Neotropical freshwater fish species.

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mentioning

confidence: 99%

Early ontogeny of the freshwater fish Rhytiodus microlepis (Characiformes, Anostomidae) from the Amazon basin

Santos,

Oliveira,

Silva

et al. 2024

Journal of Fish Biology

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Phylogeography of Hypomasticus copelandii (Teleostei, Anostomidae) Reveals Distinct Genetic Lineages along Atlantic Coastal Drainages of Eastern Brazil

et al. 2022

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Hypomasticus copelandii is a Neotropical freshwater fish widely distributed across coastal drainages of southeastern Brazil, a highly impacted region of South America. The interspecific phylogenetic relationships within the genus and the taxonomic status of the species remain uncertain. Using two mitochondrial and one nuclear locus, we performed a phylogenetic, species delimitation, and time-calibrated analyses to test the hypothesis that H. copelandii is a species complex currently delimited by different Atlantic coastal systems. Results indicate that H. copelandii presents two well-delimited genetic lineages: one in the northern drainages of the Jucuruçu, Mucuri and Doce rivers, and the other in the southern region represented by the Paraíba do Sul River Basin. The time-calibrated phylogeny indicated a split between the two genetic lineages at around 2.8 million years ago (Ma), which might be related to headwater capture events during the Plio-Pleistocene. The discovery of a distinct genetic lineage for H. copelandii suggests distinct management plans for the northern and southern drainages. Such hidden diversity within the H. copelandii provides useful information for taxonomy and conservation across a severely impacted region of Brazil.

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Insperanos, an unexpected new genus of Anostomidae (Characiformes) (project)

Cited by 2 publications

References 0 publications

Early ontogeny of the freshwater fish Rhytiodus microlepis (Characiformes, Anostomidae) from the Amazon basin

Early ontogeny of the freshwater fish Rhytiodus microlepis (Characiformes, Anostomidae) from the Amazon basin

Phylogeography of Hypomasticus copelandii (Teleostei, Anostomidae) Reveals Distinct Genetic Lineages along Atlantic Coastal Drainages of Eastern Brazil

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