What's the difference between labella and labellums?

Labella

Definition:

Example Sentences:

(1) Carbon-tetrachloride was used to maintain the proper positions of the proboscis and the labella rendering a better view of the fine structures.
(2) The first two sites included the mature 3'-end 18S rRNA sequence and a site approximately 55 nucleotides downstream of the 3'-end 18S rRNA sequence, both of which corresponded directly to recent results (Raziuddin, R. D. Little, T. Labella, and D. Schlessinger, Mol.
(3) Infected blood, applied by capillary action to the mouthparts (labella) of 15 deer flies (Chrysops sp) and a single horse fly (Tabanus atratus) caused infection in each of 2 sheep.
(4) Although results reported for a potentially identical human H1 histone gene designated Hh8C (LaBella, F., Zhong, R., and Heintz, N. (1988) J. Biol.
(5) Three kinds of hairs designated Type I (T1), Type 2 (T2) and Type 3 (T3) were analyzed on the labella.
(6) The T3 hairs, located on the oral surface of the labella, are innervated by a variable number (2-5) of neurons.
(7) Factor HiNF-P is similar to H4TF-2, a DNA-binding activity that is not cell cycle regulated and that interacts with the analogous region of the H4 gene H4.A (F. LaBella and N. Heintz, Mol.

Definition:

Example Sentences:

(1) On each side of the labellum there are 11 "largest" hairs (LH).
(2) Electrophysiological recordings showed that gustatory chemosensilla were located on the labellum, tip of labrum, labral food canal, foretarsi, tibia, and antennae.
(3) Taste hairs are located on the labellum and tarsi of blowflies.
(4) Some lines also show expression associated with other chemosensory organs at either the larval or adult stage, including the maxillary palps, labellum, and anterior wing margin.
(5) The neurons associated with the anteriormost (LH-1), posteriormost (LH-11), and one lateral (LH-6) hair on the labellum were stained selectively with cobaltous sulfide.
(6) Mature larvae protrude their anterior ends from the tip of the labellum.