Guaru| killifish Melanorivulus rossoi (Costa, 2005)
Registros de um casal de Melanorivulus rossoi (Costa, 2005). Essa espécie é caracterizada pelo corpo cinza esverdeado, em contraste com inúmeras manchas vermelhas e circulares, distribuídas principalmente no dorso do animal e nas nadadeiras ímpares. Nos machos, é visível uma faixa preta que se inicia na região da boca, se estende através da órbita e segue até o pedúnculo caudal. Inúmeras manchas pretas e circulares, semelhantes às manchas vermelhas podem ser visíveis na região ventral. Nas fêmeas a faixa preta é pouco conspícua e geralmente visível apenas na cabeça e porção mais anterior do flanco e as manchas pretas circulares no ventre são ausentes.
Embora pertença à família dos peixes anuais (Rivulidae), esse tipo de estratégia de vida não é conhecida para nenhuma espécie de Melanorivulus. Todavia, espécies desse gênero comumente apresentam alto grau de endemismo, como observado para M. rossoi, que ocorre apenas em poucos banhados e alagados nas cabeceiras do rio Anhanduí, entre os municípios de Campo Grande e Sidrolândia, em MS. Devido ao seu padrão de endemismo, é possível que M. rossoi seja uma espécie sobre algum grau de ameaça de extinção, embora tenha sido classificada como “dados insuficientes” na última avaliação de espécies ameaçadas do Brasil.
Tamanho máximo registrado na literatura científica (comprimento padrão): 35,8 mm.
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Records of a couple of the killifish Melanorivulus rossoi (Costa, 2005). This species is characterized by the gray greenish body, in contrast with numerous circular and red blotches, mainly distributed on the dorsal portion and unpaired fins. In the males, it’s visible a black strip that begins in the mouth region, extends through the orbit and follows to the caudal peduncle. Numerous circular black blotches similar to the red blotches, which can be visible in the ventral region. In females the black strip is inconspicuous and generally visible only on the head and the most anterior region of the flank and the circular black blotches are absent.
Although belonging to the annual killifish family (Rivulidae), this type of life strategy is not known to no one Melanorivulus species. However, species from this genus commonly presents high degree of endemism, which is observed to M. rossoi, that occurs only in a few plated and flooded areas on the headwaters of rio Anhanduí, between Campo Grande and Sidrolândia municipalities, in MS state. Due to its endemism pattern, it is possible M. rossoi is a species under some degree of threat of extinction, although it was classified as “data insufficient” in the last assessment of threatened species in Brazil.
Maximum size recorded in the scientific literature (standard length): 35.8 mm.
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Projeto de Extensão | Extension Project “Peixes do Mato” - EDITAL UFMS/PROECE Nº 376/2022 - EXT/PROECE-2023
Equipe executora | Executing team
Fotos | Photos: Paulo Robson de Souza (Lab. Interdisciplinar de Ensino de Ciências/Inbio/UFMS)
Texto | Text: Douglas A. Lopes (doutorando em Biodiversidade - UNESP-IBILCE).
Como citar este trabalho (texto e/ou fotos) | How to cit this work (text and/or photos):
Souza, P. R., Lopes, D. A., Fernando, A. M. E., Souza, R. N., Aristimunho, G. S., D’Almeida, A. M., Tondato-Carvalho, K. K., Súarez, Y. R., & Carvalho, F. R. (2023). iNaturalist observation 181202774, Melanorivulus rossoi (Costa, 2005). https://www.inaturalist.org/observations/181202774. Acessado: d/m/a.
Referências | References
Costa, W. J. E. M. (2005). Seven new species of the killifish genus Rivulus (Cyprinodontiformes: Rivulidae) from the Paraná, Paraguay and Araguaia river basins, central Brazil. Neotropical Ichthyology, 3(1): 69–82
ICMBio/MMA. (2018). Livro Vermelho da Fauna Brasileira Ameaçada de Extinção: Volume 6, Brasília, DF, 492p.
Severo-Neto, F. (2022). Rivulidae. In: Gimenes Junior, H., & Rech, R. Guia ilustrado dos peixes do Pantanal e entorno. Julien Design, Campo Grande, MS, 660p.
Severo-Neto, F. & Volcán, M. V. (2017). Population dynamics of Melanorivulus rossoi, a restricted geographic distribution killifish species. Environmental Biology Fish, https://doi.org/10.1007/s10641-017-0695-x.
pictures used with the explicit consent of copyright holder & tour companion Andi Tanke (www.ATS-Aquashop.de)
Seen in clear stream at surface at night, very active
Caught in a cast net approximately 1000 nautical miles from the Gulf of Mexico
Or other snapping shrimp genus?
Athanas spp?
Wild individual, photo taken indoors
Extremely dark spawner, the underside was jet black. Wish I got better pictures.
on Mantis religiosa (already dead)
https://www.inaturalist.org/observations/177687173
associated observations
https://www.inaturalist.org/observations/177687173
https://www.inaturalist.org/observations/177687176
20 Jun 2016.
Buckingham Springs, Bucks Co, PA.
Found on Prunus serotina.
This looks close to Prepops insitivus, but the scutellum is black instead of yellow, and it was found on Black Cherry--there is no Black Locust in the vicinity.
On Castanea alabamensis inflorescence.
Hatched in my hand, found it as it rolled down a hole in my raised garden bed, so couldn't return it to it's original orientation, luckily it was ready.
plucked from small retention pond near NE Philly airport
Any info or better ID on the parasite greatly appreciated
being nibbled on by mallard ducklings
Preying on another centipede
first obs with the laowa 60mm
Cuc Phuong National Park, Vietnam
Contact me on jono_dashper@hotmail.com for use of this image.
Caught via boat electrofishing. We observed them in largest numbers underneath the bridges. Substrate was large rocks.
Watched this turtle walk to the apples and eat an apple
Seen in typical scrubby Pine Barrens habitat.
tentatively assigning E. naucrates here- E. neucratoides reported only from marine environments, as far as I know. This photo was taken in low to mid-strength brackish water.
Photographer Dario Nessi - client of Royle Safaris on tour