Results 91 to 100 of about 361 (104)
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Vascular and Pericardiac Pressures inAscidiella Aspersa(Urochordata: Ascidiacea)
Journal of the Marine Biological Association of the United Kingdom, 1985INTRODUCTIONThe heart of tunicates is of physiological interest for several reasons: it is a simple peristaltic tube; it lacks valves; and the direction of the contractions changes periodically thus reversing the direction of blood flow. The phylogenetic importance of tunicates, being invertebrate chordates, also make physiological details of interest.
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Tissue and Cell, 1976
DNA-synthesizing cells in the gonads of the ascidian Styela clava were labeled with tritiated thymidine and detected with autoradiography. In the testis, spermatogonia and primary spermatocytes are labeled after 1 hr. Labeled spermatozoa occur in the lumen of the testis follicles after 10 days and in the sperm ducts after 20 days.
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DNA-synthesizing cells in the gonads of the ascidian Styela clava were labeled with tritiated thymidine and detected with autoradiography. In the testis, spermatogonia and primary spermatocytes are labeled after 1 hr. Labeled spermatozoa occur in the lumen of the testis follicles after 10 days and in the sperm ducts after 20 days.
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Taxonomy of Ascidians (Urochordata: Ascidiacea) in Japan: Past, Present, and Future
2016A historical retrospect of the ascidian taxonomy in Japan is briefly given, with a taxonomic revision of Hartmeyer’s (Zool Anz 31:1–30, 1906) monograph based on my reexamination of name-bearing type and other specimens long kept in European museums.
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2001
The body of ascidians is covered by the tunic, which is produced by epidermis and extends also into the siphons as far as the tentacular ring. In botryllids, at the surface exposed to the seawater, the tunic forms a thin dense cuticle bearing numerous small papillate protrusions.
BURIGHEL P. +3 more
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The body of ascidians is covered by the tunic, which is produced by epidermis and extends also into the siphons as far as the tentacular ring. In botryllids, at the surface exposed to the seawater, the tunic forms a thin dense cuticle bearing numerous small papillate protrusions.
BURIGHEL P. +3 more
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Dichlorolissoclimide, a new cytotoxic labdane derivative from Michaelson (Urochordata)
Tetrahedron Letters, 1991C Malochet-Grivois +6 more
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