| There is one type of lyriform organ, however, that differs from the others in its location and in certain structural details. |
| It appears, therefore, that the tarsus serves as a sensing element that transmits vibrations to the lyriform organ, which thus is a velocity type of ear. |
| In the male of M. alberti the tail is not only not lyriform, but the exterior rectrices are shorter than the rest. |
| These variations of sensitivity are ascribed to mechanical resonances in the lyriform structure. |
| Thus, in view of the high level of sensitivity to both aerial and mechanical stimuli, the reception of sounds in the spider can probably be regarded as true hearing, and the lyriform organ as a form of ear. |
| The bodies of spiders contain many slitlike openings, called lyriform organs, that have been considered as sensory in nature. |
