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SUPPLEMENTARY NOTES ON THE ANATOMY OF METARUNCINA SETOENSIS (BABA, 1954), (N. G.) (OPISTHOBRANCHIA-CEPHALASPIDEA)

1967; Seto Marine Biological Laboratory; Volume: 15; Issue: 3 Linguagem: Inglês

10.5134/175467

2189-2695

Kikutarô Baba,

Aquatic Invertebrate Ecology and Behavior

With Plates II-VThe species which forms the subject of this paper was originally reported by me as Runcina setoensis BABA, 1954.After that paper was published, there was found in the years 1955,-.....,1959 a great increase in the population of Runcina around the type locality, and part of them were used as the material for the studies of their spawn and developing embryos in the laboratory (BABA and HAMATANI, 1959).With this advantage of having abundant material at my disposal, I decided to go further to make more detailed accounts of the species on the basis of a microscopic study of the animals.In the beginning of October, 1963, I had fortunately chances to discuss with Dr. M.T. GHISELIN, who was at Seto at that time, about the phylogeny of the Runcinidae.His ingenious ways of research on Runcina brought him successful results (GHISELIN, 1963) and stimulated me as valuable suggestions for my subsequent works.Before going to summarize my studies, I have to mention that I was affected partly by Mr. R. BuRN (1963): he showed his talent in the systematic classification of Runcina and its allies.Metaruncina BABA, n. g.Most closely allied to Ildica BERGH, 1889 (type: I. nana BERGH, 1889.-Mauritius) in the possession of a single cephalaspidean gill on the right posterior side of body, but differentiated from it in having a greatly degraded radula which remains in a triseriate type ( 1.1.1.)in Ildica.Shell posterior, terminal, internal in Metaruncina, and external ( ?) in Ildica.Genitalia without a spermatheca (bursa copulatrix).