Scalpelliformes e lepadiformes (Crustacea, Cirripedia) de mar profundo da Bacia de Campos e Elevação do Rio Grande (Atlântico Sul ocidental)

• Main Author: Schulz, Filippe Henrique Piveta
• Format: Doctoral or Postdoctoral Thesis
• Language: unknown
• Published: Universidade Federal Fluminense 2020
• Subjects: Hoek; South Atlantic Ocean
• Online Access: https://archimer.ifremer.fr/doc/00720/83239/88263.pdf; https://archimer.ifremer.fr/doc/00720/83239/

Deep-sea scalpelliformes and lepadiformes (Crustacea, Cirripedia) of Campos Basin and Rio Grande Rise (Western South Atlantic) the stalked barnacles form a paraphyletic taxonomic group known for having a specialized structure in fixing it to the substrate, the peduncle. For the South Atlantic ocean, they are best known among deep-sea, although can be also found species associated to shallow environments. This work analysis samples of three projects: Environmental characterization of the deep ocean in the exploration and production area in the Campos Basin (Oceanprof); Evaluation of environmental heterogeneity in the Campos Basin (HABITATS); and Cobaltiferous crusts of the Rio Grande Rise project (PROERG), with the objective of identifying and characterizing the populations of these animals to the deep seas of the Campos Basin and the Rio Grande Rise. A total of 645 specimens were identified on eleven species. Five of them of Lepadiformes order: Glyptelasma gracile (Hoek, 1883), Glyptelasma hamatum (Calman, 1919), Glyptelasma sp., Poecilasma inaequilaterale Pilsbry, 1907, Poecilasma litum Pilsbry, 1907, and seven of the Scalpelliformes order: Scillaelepas grimaldi (Aurivillius, 1898), Smilium acutum (Hoek, 1883), Diceroscalpellum boubalocerus (Young, 1992), Catherinum idioplax (Pilsbry, 1907), Arcoscalpellum michelottianum (Seguenza, 1876), Graviscalpellum regina (Pilsbry, 1907). Six new occurrences have been recorded for the Western South Atlantic, jumping from 56 known species to 62, representing an increase of 10%. The characterization includes reproductive parameters of the species found. A total of six species presented eggs: G. gracile, lyptelasma sp., D. boubalocerus, C. idioplax, A. michelottianum and Gr. regina, these made possible to discover data of fecundity and eggs size about the populations found. It was also observed that, for the populations found, all except C. idioplax and A. michelottianum, were composed of hermaphroditic species, with both species being dioecious and presenting sexual ...