The Complete Postembryonic Development of Megadiaptomus Hebes Kiefer, 1936 (Copepoda, Calanoida) Reared in the Laboratory

Studies on the Phylogenetic Implications of Ontogenetic Features in the Poecilostome Nauplii (Copepoda : Cyclopoida)

“…14C) (see Oberg, 1906;Lebour, 1916;Gurney, 1934a;Campbell, 1934;Johnson, 1934bJohnson, , 1935Johnson, , 1948Johnson, , 1965Johnson, , 1966Steuer, 1935;Humes, 1955;Comita & Tommerdahl, 1960;Koga, 1960b;Bjornberg, 1966Bjornberg, , 1972Lawson & Grice, 1970;Uye & Onbe, 1975;Reddy & Devi, 1985). In most harpacticoids (Fig.…”

“…The first antenna of a typical calanoid nauplius is comparatively large and characteristic in having a broad or long distal segment (see Oberg, 1906;Lebour, 1916;Gurney, 1934a;Campbell, 1934;Johnson, 1934aJohnson, , b, 1935Johnson, , 1937Johnson, , 1948Johnson, , 1965Johnson, , 1966Humes, 1955;Koga, 196Gb, 1968Comita & Tommerdahl, 1960;Gaudy, 1961;Ummerkutty, 1964;Matthews, 1964;Shen & Chang, 1965;Bjornberg, 1966Bjornberg, , 1972Grice, 1969;Lawson & Grice, 1970;Uye & Onbe, 1975;Reddy & Devi, 1985).…”

“…1916; Gurney, 1934a;Campbell, 1934;Johnson, 1934bJohnson, , 1935Johnson, , 1937Johnson, , 1948Johnson, , 1966Steuer, 1935;Humes, 1955;Comita & Tommerdah1, 1960;Koga, 1960bKoga, , 1968Gaudy, 1961;Ummerkutty, 1964;Matthews, 1964;Shen & Chang, 1965;Lawson & Grice, 1970;Uye & Onbe, 1975;Reddy & Devi, 1985). On the contrary, 1eci-thotrophic naup1ii lack this process, particularly in Euchaeta Japonica (Campbell, 1934;Lewis & Ramnarine, 1969), E. norvegica (Nicholls, 1934), E. marina and Candacia armata (Bernard, 1964), Pareuchaeta russelli (Koga, 1960a), and Tortanus discaudatus and Pontellopsis occidentalis (Johnson, 1934a(Johnson, , 1965.…”

“…The possible counterpart of the three prominent spines of the first endopodal segment in the cyclopoid nauplii is also found in the endopod of the calanoid nauplii, despite of the difference in segmentation. The tuft of armature on the medial protrusion includes usually three stout spines, which is considered the correspondent of the three prominent spines in question, and the other two tufts correspond to two tufts of the second segment in Cyclopoida (Oberg, 1906;Campbell, 1934;Johnson, 1934aJohnson, , b, 1935Johnson, , 1937Johnson, , 1948Johnson, , 1965Johnson, , 1966Steuer, 1935;Conover, 1956;Humes, 1955;Koga, 1960b;Comita & Tommerdahl, 1960;Grice, 1969;Lawson & Grice, 1970;Bjorenberg, 1972;Uye & Onbe, 1975;Reddy & Devi, 1985). Thus, the one-segmented endopod in the Calanoida and perhaps most harpacticoids is considered corresponding with two-segmented condition found in the Cyclopoida, Longipedia and Canuella.…”

“…In the Calanoida, the maxilliped appears as a minute swelling of the sternal surface in the fifth nauplius stage and develops usually into an elongate uniramous appendage in the last naupliar stage (see Oberg, 1906;Gurney, l934a;Campbell, 1934;Steuer, 1935;Johnson, 1937Johnson, , 1966Humes, 1955;Comita & Tommerdahl, 1960;Koga, l960a, b;Ummerkutty, 1964;Bjornberg, 1972;Lawson & Grice, 1970;Reddy & Devi, 1985). The maxilliped in the last naupliar stage is two-segmented, though indistinct in some cases, and tipped with some setae.…”