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The palpal bulb of a mature male spider is borne on the last segment of the pedipalp. This segment usually has touch-sensitive hairs (setae) with nerves leading to them. The bulb itself is entirely without nerves, and hence without sensory organs and muscles, since these depend on nerves for their functioning, [ 1 ] although some spiders have ...
In sexually-mature male spiders, the final segment of the pedipalp, the tarsus, develops a complicated structure (sometimes called the palpal bulb or palpal organ) that is used to transfer sperm to the female seminal receptacles during mating. The details of this structure vary considerably between different groups of spiders and are useful for ...
Some spiders, such as the Australian crab spider, do not have claws. The pedipalps have only six segments: the metatarsus is missing. In adult males, the tarsus of each palp is modified to carry an elaborate and often species-specific structure used for mating (variously called a palpal bulb, palpal organ or copulatory bulb). [7]
Male Huishui dwarf spiders have unique genitalia, known as pedipalps, the study said. Pedipalps are the shorter front appendages that function both as sensory organs and reproductive organs.
Palpal bulb (also called bulbus, palpal organ, genital bulb): The copulatory organ of the male spider, carried on the modified last segment of the pedipalp, used to transfer sperm to the female; [20] see also Palpal bulb; Conductor: A part of the palpal bulb that accompanies and supports the embolus [6]
The male pedipalp has a palpal organ consisting of the tarsus (or cymbium), which is divided at the tip into two long lobes, and a simple palpal bulb similar to that of some mygalomorph spiders but apparently less complex than the bulbus of mesotheles. The abdomen is segmented, like that of a mesothele spider.
The spider has short brownish-orange legs that have darker dots on some of the surfaces. The copulatory organs are distinctive. The pedipalp is dark with three tibial apophyses, or spikes. [4] There is a suggestion of an apophysis on the edge of tegulum that has the appearance of teeth. The ventral apophysis is shaped a bit like a shovel. [10]
This type becomes substantially reduced in orb-web spiders, in which a collecting duct is lacking and the labyrinth apparently no longer has an excretory function." (Biology of Spiders, 1996) I would also like to point out that Biology of Spiders includes two diagrams similar to the one above. One shows the entire spider and one shows only the ...