Morris J., Lycett J.'s A Monograph of the Mollusca from the Great Oolite, Chiefly PDF

By Morris J., Lycett J.

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Extra resources for A Monograph of the Mollusca from the Great Oolite, Chiefly from Minchinhampton and the Coast of Yorkshire, Part I: Univalves

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G Surface of bulb. 4 The Chelicerae The foremost extremities on the prosoma in front of the mouth are the chelicerae. They are divided into two segments, a powerful base (paturon) and a mobile fang (unguis). The paturon and the fang are so articulated that they can grasp prey like pincers. In the resting position the fang is folded into a furrow in the paturon like the blade of a penknife. Many spiders have a row of teeth along each edge of this furrow. These are used together with the fangs to cut up their prey (Plate 4; Fig.

50 11m. f Cuticle of the opisthosoma. No real hairs have yet been formed. 13 Surface Structures of a Spider The surface of a spider's body is covered by numerous hairs. Pirata uliginosus has feather-like hairs which are mechanoreceptors and as such perceive tactile stimuli. Besides these simple hair sensilla, trichobothria are often distributed over the body and the appendages. The fine structure of the cuticular surface of P. uliginosus consists of strikingly regular lamellae due to fine folding of the cuticle.

9 Free Hunting Spiders The majority of the epedaphic spiders spend the day in their silk-lined cell dwellings, under stones, in leaf litter or moss and become active at night when they go hunting. Lycosid wolf spiders (Lycosidae) (Schaefer, 1972, 1974), clubionid (Clubionidae) and drassodid (Drassodidae) spiders belong to this group. Callilepis nocturna (Drassodidae) preys exclusively on ants. The spider searches out ant nests and attacks the ants in front of the nest entrance. It quickly bites its prey at the base of the antenna, then withdraws and waits approximately one minute till the poison has taken effect Araneae - Spiders (Arachnida) before devouring the immobilized ant (Heller, 1976).

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A Monograph of the Mollusca from the Great Oolite, Chiefly from Minchinhampton and the Coast of Yorkshire, Part I: Univalves by Morris J., Lycett J.


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