A new type of web spun by spiders of the genus Ulesanis with the description of two new species



A new type of spring web, spun by spiders of the genus Ulesanis of the Theridiidae, is described. It consists of a straight or Y-shaped sticky thread. The spider holds one end of the thread in one foot and sits on a twig. When prey is caught it releases the twig and allows the thread to go slack. This behaviour affords a close parallel to the single-thread cribellated web of Miagrammopes. Two new species of Ulesanis, U. pukeiwa and U. puketoru, are described from New Zealand, and they are compared with other Australasian and Pacific species.