Dias, C.O. (2002). Taxonomia e distribuição geográfica dos Monstrilloida (Copepoda -- Crustacea) do Atlântico sul ocidental. Taxonomy and geographic distribution of Monstrilloida (Copepoda -- Crustacea) from the South Occidental Atlantic. Tese de Doutorado, Museu Nacional, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil. 336 pp. [In Portuguese and English].
485695
Dias, C.O.
2002
Taxonomia e distribuição geográfica dos Monstrilloida (Copepoda -- Crustacea) do Atlântico sul ocidental. Taxonomy and geographic distribution of Monstrilloida (Copepoda -- Crustacea) from the South Occidental Atlantic.
Tese de Doutorado, Museu Nacional, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil.
The Monstrilloida is one ofthe least know orders of Copepoda. Taxonomic and ecological works of the group are limited by the rarity of specimens which are captured by plankton nets as adults only. Most stages are highly modified internai parasites of benthic polychaetes and molluscs. The material examined was collected during zooplankton surveys in neritic and oceanic areas off the coast of Brazil and Argentina. Eighteen monstrillod species of the genera Monstrilla, Cymbasoma e Monstrillopsis (Monstrilloida: Copepoda: Crustacea) are reported herein for the South Occidental Atlantic (5-50 ºS). Their distribution. morphology. and ecological information is given for each specie. Out of the eighteen species. seven were identified as new taxa (Monstrilla brasifiensis Suárez-Morales & Dias 2000. Monstrilla careli Suárez-Morales & Dias 2000, A1onstrilla pustulata Suárez-Morales & Dias 2001a. Monstri/la satchmoi Suárez-Morales & Dias 2001b. Monstrilla bahiana SuárezMorales & Dias 2001b. Cymbasoma rachai Suárez-Morales & Dias 2001b, and Monstrillopsis fosshageni Suárez-Morales & Dias 2001b). Five others species had their distribution revised and expanded (j\tfonstrilla grandis Giesbrecht. 1891, Monstrilla helgolandica Claus. 1863. Cymbasoma rigidum Thompson, 1888. Cymbasoma longispinosum Bourne. 1890. and lvfonstrillopsis dubia T. Scott, 1904). The original know distribution was confirmed for Monstrilla rugosa Davis. 1947 and Cymbasoma quadridens Davis. 1947. Monstrillopsis gracilis Gurney. 1927 was considered to be a new regional record. Three taxa were classified as genus (Monstrilla sp. 1 Hoffmeyer. 1983. Monstrilla sp. 2 Duarte, 1999. and Cymbasoma sp. Duarte. 1999). The previous record of Monstrilla cf. reticulata (Dias.
XII M.
1 996) in Brazilian waters was reallocated in the new brasiliensis after the revision of the material. The diagnostic taxonomic characteristics of the South Occidental Atlantic specimens are similar to the one found in other places. with some variations in relation to the length of the body. The pattem of antennular armature was described for each species in order to use this feature in future taxonimical comparisons. The fifteen species were associated to four areas each with distinct conditions of temperature and salinity. The following associations of monstrilloids in the surveyed area were determined by cluster analysis: a) species associations of the Tropical Zone - with species of Areas l and 2 . ln Area 1 Monstrilla grandis. M rugosa, M careli, Cymbasoma rigidum. C. longispinosum, and Monstrillopsis gracilis occurred. lt included the coast of region from Rio Grande do Norte to Alagoas (Brazil), with temperatures ranging between 27 and 37 ºC and salinity between 35.4 and 36.4 PSU. These values are characteristic of the Shelf and Tropical Waters in the region. Monstrilla brasiliensis. M. careli. M. satchmoi, M bahiana, and Monstrillopsis gracilis occurred in Area 2, restricted to coastal zone of Bahia (Brazil). with temperatures between 25.4 and 26. 9 ºC and salinity between 36.4 to 3 7.4 PSU characteristic of Tropical Water: b) species association of the Subtropical Zone - it included Monstrilla grandis. i\1. careli. M. rugosa. M. brasiliensis, M. pustu/ata, M satchmoi. Cymbasoma quadridens. C. longispinosum. C. rigidum. C. rachai. Monstrillopsis dubia. M. gracilis. and M fosshageni occurred in the coastal zone from Espírito Santo to Santa Catarina (Brazil), with a thermal range of 20.5 29.6 ºC and a salinic variability of 28 - 35.9 PSU; these values are characteristic of the Shelf and Coastal Waters; and e) species association of the Transitional Zone - with Monstrilla g r andis and ,\;f helgolandica. both occurred in the coasts off Argentina ( 12.3 to 1 9 ºC. 33.3 to 34 PSU. The Transitional Zone is defined as an area of mixture of Subtropical and Subantarctic Zone conditions. These is a decreasing number of species from North to South.
