Microarthridion corbisierae sp. nov. (Harpacticoida, Tachidiidae), um novo copépode da meiofauna do litoral norte do estado de São Paulo, Brasil

Abstract

Durante estudos sobre a diversidade de copépodes harpacticóides meiobentônicos marinhos, um novo representante da família Tachidiidae foi encontrado na plataforma continental interna do estado de São Paulo, entre o canal de São Sebastião e a área costeira em frente á praia de Ubatumirim, Ubatuba (23º24'S, 44º57,6'W). Material complementar foi coletado próximo à praia da Enseada, Ubatuba (23º30'S, 45º05'W). Embora esta nova espécie compartilhe com M. laurenticum (Nicholls, 1940) a redução das antênulas, ela pode ser facilmente distinguida de seus congêneres pela presença de apenas 2 artículos no endópodo da perna 4 e pela redução no número de cerdas internas do endópodo-3 das pernas 1-4 e do exópodo-3 da perna 3. Os Tachidiidae, que tipicamente habitam sedimentos finos de águas rasas salobras e marinhas do Hemisfério Norte, são considerados bioindicadores de ambientes ricos em material orgânico. Este é o primeiro relato da família no hemisfério sul.

Species of Harpacticoida (Crustacea, Copepoda) from the phytal of Porto de Galinhas coral reefs, northeastern Brazil

“…The harpacticoid fauna of certain regions (such as the North Sea in Europe) has been well studied and described since the 19 th century (for literature see Wells 2007 andHuys 2009). On the other hand, despite the great extent of the Brazilian coast, taxonomic studies of Harpacticoida are few and have resumed only recently (e.g., Kihara and Rocha 2007;Vasconcelos et al 2008;2009;Wandeness et al 2009), after some earlier descriptions during the 1950s, mainly by Hans Jakobi (some of these species are now considered species inquirendis). The harpacticoid copepod fauna in the phytal of Porto de Galinhas is highly diverse.…”

A New Record of Microarthridion littorale (Copepoda, Harpacticoida, Tachidiidae) from Korea with Taxonomic Note on the Species

“…Remarks. The Korean specimens examined in the present study are herein attributed to M. littorale (Poppe, 1881) in the following diagnostic features for females: 6segmented antennule, antennary exopod with four setae totally, P1 enp 3 with five setae, P2-P3 enp2 with two setae, respectively, and P5 represented by a single plate bearing four plumose setae (Boxshall and Halsey, 2004;Kihara and Rocha, 2007;Tran and Chang, 2012). However, our specimens differ from the representative records of M. littorale (Poppe, 1881;Scott, 1892;Gurney, 1932;Borutsky, 1952;Tai and Song, 1979;Huys et al, 1996) by the following: (1) the maxillipedal syn coxa is armed with six groups of spinules and one group of long setules, while it is ornamented with only two rows of spinules in the records of Poppe (1881) and Gurney (1932); (2) the maxillipedal endopod has one long and one very small accessory setae, whereas it is armed with only one long seta in the materials of previous records; (3) both anter ior and posterior surfaces of the swimming legs are armed with several rows of setules or spinules, while these orna mentations are absent or simple in previous records; (4) the distal inner setae on enp3 of the swimming legs are distally serrate, whereas it is plumose in previous records; (5) the inner apical seta of P2 enp3 in males is slightly swollen at its proximal, while it is not expanded in the records of Gurney (1932) or Huys et al (1996).…”

“…Such segmentation of the antennule in the females is consi dered as an important identification key for Microarthridion species (Boxshall and Halsey, 2004;Kihara and Rocha, 2007;Tran and Chang, 2012). However, discrepancy of antennular segmentation is known among species reported as M. littor ale.…”

“…Among socalled M. littorale, nevertheless, M. littorale sensu Tai and Song (1979) from China is prob ably a species distinct from Microarthridion littorale (Poppe, 1881) based on its small body size, the segmentation of antennule, and the length of the second inner seta on female P5 endopodal lobe. If those Chinese specimens indeed have 5segmented antennule, they should not be coincided as M. littorale (Poppe, 1881) because the segmentation of the antennule is presently considered as an important identifi cation key in the taxonomy of the genus (Kihara and Rocha, 2007;Tran and Chang, 2012). However, the real meaning of these morphological discrepancies merit further study with materials from China, Europe, and other regions.…”

Two new species of harpacticoid copepods from anchialine caves in karst area of North Vietnam

“…In the family, Microarthridion Lang, 1944 is the largest genus containing seven species (Boxshall and Halsey 2004). Recently, Kihara and Rocha (2007) described a new species, M. corbisierae Kihara and Rocha, 2007, from Brazil, and provided a short key to the eight species in the genus. Members of the genus Microarthridion are mainly marine and brackish, but some species are occasionally found in freshwaters.…”