noun (plural haustella /hɔːˈstɛlə/)Zoology
The sucking organ or proboscis of an insect or crustacean.
- It is about 4-5 cm long, and has a kind of ‘hook’ at the head, which is where the moth's tongue, or haustella, is formed.
- Adult mouthparts are reduced, with mandibles essentially absent, but the maxillary and labial palps, and often the haustellum, are prominent.
- The feeding structures of lice are complex, including the haustellum, a proboscis-like tube with teeth, which is used to pierce the host's skin.
- Example sentences
- They are distinguished from the other major group of insects with haustellate mouthparts, the Order Hemiptera or true bugs, in that Homopteran beaks arise on the back of the head, while Hemipteran beaks arise from the front of the head.
- In the haustellate type, it is the mandibular and maxillary appendages that are similar, whereas the labial appendages exhibit a completely different structure.
- Sucking lice have stylate haustellate mouthparts (piercing-sucking).
Early 19th century: modern Latin diminutive of haustrum 'scoop', from haust- 'drawn in', from the verb haurire.
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