New Species of Rhabdosynochus Mizelle and Blatz 1941 (Monogenoidea: Diplectanidae) From the Gills of the Cultured Centro
- PDF / 1,857,822 Bytes
- 6 Pages / 595.276 x 790.866 pts Page_size
- 13 Downloads / 152 Views
ORIGINAL PAPER
New Species of Rhabdosynochus Mizelle and Blatz 1941 (Monogenoidea: Diplectanidae) From the Gills of the Cultured Centropomus viridis (Perciformes) in the Mexican Eastern Tropical Pacific Marilú Montero‑Rodríguez1,2 · Edgar F. Mendoza‑Franco3 · Norma A. López Téllez1 Received: 13 February 2020 / Accepted: 22 October 2020 © Witold Stefański Institute of Parasitology, Polish Academy of Sciences 2020
Abstract Purpose There are currently nine monogenoidean species of Rhabdosynochus infecting the gill lamellae of wild and cultured centropomid fishes from tropical and subtropical waters of the western Atlantic and eastern Pacific Oceans. The purpose of the present study was to describe the morphological distinctiveness of two new species of Rhabdosynochus found on the cultured Centropomus viridis collected from floating cages from the Mexican eastern Tropical Pacific in 2018. Methods monogenoideans were fixed with 4–5% formalin solution, observed and measured as temporary or permanent mounts stained with Gomori’s trichrome, and mounted in Canada balsam. Other specimens were mounted on slides using a mixture of lactic acid (LA) and glycerin-ammonium picrate (GAP) and then remounted in Canada balsam to obtain measurements of the haptoral structures and copulatory complex. Illustrations were prepared with the aid of a drawing tube using a Leica microscope DM 2500 with Nomarski interference contrast. Results Rhabdosynochus viridisi n. sp. is mainly differentiated from all other congeneric species in the shape and size of their copulatory complexes, i.e., length 75–105 µm vs. 45–55 µm in R. alterinstitus, 26–44 µm in R. volucris, 19–22 µm in R. lituparvus, 21–37 µm in R. siliquaus, 48–75 µm in R. hargisi, 37–44 µm in R. hudsoni and 44–61 µm in R. guanduensis. Rhabdosynochus pacificus n. sp. differs from all other species of the genus in having an accessory piece (one subunit) distally twisted. Conclusions Based on the morphometric differences of the two new species described above, the number of valid species of Rhabdosynochus has now increased to 11. These two new species of Rhabdosynochus represent the first described species of the genus on C. viridis. Keywords Monogenoidea · Centropomidae · Cultured fish · Floating cages · Ectoparasitic platyhelminths · Commercial marine fish
* Edgar F. Mendoza‑Franco [email protected] Marilú Montero‑Rodríguez [email protected] Norma A. López Téllez [email protected] 1
2
Universidad Autónoma Metropolitana Unidad-Xochimilco, Calzada del Hueso 1100 Colonia Villa Quietud, Alcaldía Coyoacán, C.P. 04960 Mexico City, Mexico
3
Instituto de Ecología, Pesquerías y Oceanografía del Golfo de México (EPOMEX), Universidad Autónoma de Campeche (UAC), Av. Héroe de Nacozari No. 480, CP. 24029 San Francisco de Campeche City, Mexico
Dirección General Adjunta de Investigación en Acuacultura, Instituto Nacional de Pesca Y Acuacultura (INAPESCA), Av. México No. 190, Colonia Del Carmen, C.P. 04100 Mexico City, Mexico
13
Vol.:(0123456789)
Intro
Data Loading...
