Maxillulae sentence example

maxillulae
  • In specialized biting insects, such as beetles (Coleo C ptera), the labium tends to become a hard transverse plate bearing the pair of palps, a median structure - known as the ligula - formed of the conjoined laciniae, and a pair of small rounded processes - the reduced galeae - often called the " paraglossae," a term better avoided since it has been applied also to the maxillulae of Aptera, entirety different structures.
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  • It does not appear to represent a pair of appendages, but the maxillulae of the Aptera become closely associated with it.
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  • Maxillulae rarely distinct.
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  • Biting mandibles; minute but distinct - maxillulae; second maxillae incompletely fused.
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  • Biting mandibles; vestigial maxillulae; second maxillae incompletely fused.
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  • Aquatic larvae with distinct maxillulae, breathing dissolved air by abdominal tracheal gills.
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  • So the Dermaptera, which retain distinct maxillulae and have no ectodermal genital ducts, have either specialized or aborted wings and a large number of Malpighian tubes.
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  • The Corrodentia retain vestigial maxillulae and two pairs of Malpighian tubes, but the wings are somewhat specialized in the Copeognatha and absent in the degraded and parasitic Mallophaga.
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  • Distinct and conspicuous maxillulae are associated with the tongue or hypopharynx.
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  • In the absence of cerci the Corrodentia are more specialized than the Isoptera and Plecoptera, but some of them show a more primitive character in the retention of vestigial maxillulae - the minute pair of jaws that are found behind the mandibles in the Aptera.
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  • The maxillulae and maxillae (or, as they are often termed, first and second maxillae) are nearly always flattened leaf-like appendages, having gnathobasic lobes or endites borne by the segments of the protopodite.
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  • The maxillulae are sometimes closely connected with the " paragnatha " or lobes of the lower lip, when these are present, and it has been suggested that the paragnatha are really the basal endites which have become partly separated from the rest of the appendage.
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  • All the cephalic appendages are much reduced, the mandibles have no palps, and the maxillulae are vestigial.
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  • As regards wing-structure, the Isoptera with the two pairs closely similar are the most primitive of all winged insects; while in the paired mesodermal genital ducts, the elongate cerci and the conspicuous maxillulae of their larvae the Ephemeroptera retain notable ancestral characters.
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