Calanoid Copepods from the Caribbean Sea and Gulf of Mexico. 2. New Species and New Records from Plankton Samples

Bulletin of Marine Science -Miami- (Impact Factor: 1.33). 05/1970; 20(2):472-546.

ABSTRACT Twenty-eight new species of calanoid copepods and the male of Bathypontia minor (Wolfenden, 1906) are described from specimens found in vertically collected samples of plankton obtained in the Caribbean Sea and Gulf of Mexico. Diagnoses or systematic remarks are presented for 16 other species of calanoid copepods. Fifty-eight species of calanoid copepods not previously known from the Caribbean Sea and Gulf of Mexico are reported. A key is included for the identification of the species of Spinocalanus.

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    ABSTRACT: The abundance and vertical distribution (0-1230 m) of copepods were studied in the eastern tropical Pacific near the seamount Volcano 7 to examine the influence of the extreme oxygen minimum zone (OMZ). Maximum zooplankton biomass and copepod abundance were in the thermocline zone. A secondary peak in biomass and copepod abundance was evident between 600 and 1000 m, which included the depth of the lower interface of the OMZ. This prominent secondary peak in zooplankton is a feature unique to OMZ regions.There were four general trends of vertical distribution of copepod abundance. These trends appeared to be related to the oxygen concentration and gradients. The most common vertical distribution was a pattern of maximum abundance in the mixed layer and thermocline zones, with a secondary maximum in the zone of the lower OMZ interface (600-1000 m). Clausocalanus spp., Oncaea, spp., Euchaeta spp., Oithona spp. and Corycaeus spp. showed this trend. Low oxygen concentration did not appear to restrict these groups, since they were present throughout the OMZ. The second vertical distributional pattern was vertical migration between the thermocline and the OMZ. Pleuromamma robusta showed this pattern, with maximum abundance at night in the thermocline zone and during the day in the core of the OMZ. In addition, there was a secondary maximum of abundance at the lower OMZ interface zone. The third type of distribution was shown by copepods that were abundant in the upper OMZ and at the lower OMZ interface zones. Eucalanus inermis, Haloptilusparalongicirrus and Heterostylites longicornis were dominant copepod species that exhibited this pattern. They were either absent from the mixed layer or at similar abundances in the mixed layer and upper OMZ. The fourth pattern was shown by copepod species that live primarily above the OMZ day and night.The majority of the species appeared to be tolerant of the extreme low oxygen concentrations. Rhincalanus spp. was the dominant copepod that was excluded by low oxygen concentrations. In general, species also found in other OMZ regions showed similar distributions in this study, indicating that low oxygen is a major controlling factor. Some vertical niche separation among congeneric species was indicated for Eucalanidae, Metridiidae and Augaptilidae.
    Deep Sea Research Part I Oceanographic Research Papers 06/1997; 44(6):931-954. DOI:10.1016/S0967-0637(97)00006-X · 2.83 Impact Factor
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    ABSTRACT: A new calanoid copepod species, Brodskius arcticus sp. nov. (family Tharybidae Sars, 1902), and three new species of a new genus Pertsovius gen. nov. (family Discoidae Gordejeva, 1975) are described from deep waters of the Arctic Canada Basin. The female of Brodskius arcticus differs from five of the other six known species of this genus in the absence of rostral filaments, the lack of which it shares with B. abyssalis Markhaseva & Schulz, 2007. This new species differs from B. abyssalis in having two very short outer proximal spines at the distal segment of the fifth swimming legs (P5). The length of these spines is less than half the width of the segment, whereas in B. abyssalis they are longer than the width of the segment. The new genus Pertsovius is created here for a group of seven species within the family Discoidae which have one-segmented endopods of Р2-Р4. In contrast, the other genera of this family have three-segmented endopods of Р2-Р4. The three new species of Pertsovius differ from each other in the appearance of the genital field, and in the number of outer border spines on the distal exopodal segment of P2. In Pertsovius tridentatus sp. nov. this segment bears three external spines on both left and right P2. The left Р2 of P. heterodentatus sp. nov. has three spines, while the right Р2 bears two spines only. The distal segments of both left and right Р2 of P. serratus sp. nov. have two external spines, but the proximal part of the external margin on the left Р2 bears three relatively large denticles. The distal exopodal segments of Р2 of the other four species here transferred to the genus Pertsovius are smooth with no external spines or denticles, but each bears two outer border spines. Key words: Copepoda, Calanoida, taxonomy, diversity, Arctic Canada Basin, deep water
    Zootaxa 01/2011; 2809:33-46. · 1.06 Impact Factor
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    Marine Ecology Progress Series 01/1982; 8:129-143. DOI:10.3354/meps008129 · 2.64 Impact Factor


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