haustellum


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haustellum

[hȯ′stel·əm]
(invertebrate zoology)
A proboscis modified for sucking.
References in periodicals archive ?
Most of these specimens are isolated wings, but several do preserve other body parts including one specimen from the Sinemurian of Dorset in which an external haustellum is preserved suggesting that the Necrotauliidae are trichopterans and not stem-Amphiesmenoptera.
Head: Vestiture of vertex appressed, scales piliform, directed toward frons; ocelli and chaetosemata absent; antennae filiform, without pecten; flagellomeres without scales ventrally, lamination not as clear as in Urodus; labial palpus 1st segment 1/2 as long as 2nd; 2nd segment with ventral scale tufts, denser distad; 3rd segment with obtuse apex, as long as 2nd; maxillary palpus very short, 1-segmented; haustellum naked, 2 x longer than labial palpus.
1 haustellum 2 shrug 3 hydrangea 4 selachian 5 tuba 6 pratincole 7 expectorate 8 imam 9 nosology 10 sirdar 11 galilee 12 ju-jitsu 13 nincompoop 14 resipicence 15 strelets 16 welkin 17 wow-wow 18 encyclical 19 heriot 20 muezzin
Diagnosis: General colouration dark greyish, with yellowish tinge; head 1.25* as wide as high; arista plumose only on dorsal surface; palpus spatulate, slightly narrowed in basal 1/4 to 1/2 reaching tip of haustellum when proboscis flexed; presternum setulose; proepisternal depression and postalar wall bare; prealar seta differentiated or vestigial; lower calypter ca 2x as long as upper calypter.