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DEVELOPMENTAL CHANGES IN THE WEB SPINNING INSTINCT OF ULOBORIDAE : CONSTRUCTION OF THE PRIMARY-TYPE WEB by R. SZLEP.1) (Dept. of Zoology, The Hebrew University, Jerusalem) ( With 3 Plates and 5 Figures) (Rec. 5-VI-1960) INTRODUCTION ' Ordinary web spinning is a complex of actions proceeding in a strictly determined order. The best investigated so far is the spinning process in Aranea diadel1wta, which is therefore the classic example of orb-web weav- ing (PETERS, 1933, 1937, 1939; PETRUSEWICZOWA, 1938; TILQUIN, 1942) The same spinning actions appear in the Cribellatae as well as in the Ecri- bellatae. Although the orb-webs of various spiders differ in their specific structure, they are built according to the same plan and by the same technique. The first web of the young orb-weavers has exactly the same fundamental structure as the later ones. In accordance with the size of the young spiders the primary webs are small, as are the angles between the radii and the distances between the spiral rows. The primary webs are built by the same technique as the adults' webs. The only example of significant differences in structure and appearance between the primary and the later webs is found in the
Behaviour – Brill
Published: Jan 1, 1961
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