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Aug 26, 2019 · Key transcription factors are associated with the holometabolous life stages: Krüppel-homolog 1 (Kr-h1) in the larva, broad in the pupa and E93 in the adult. Kr-h1 mediates JH action and is found whenever JH acts, while the other two genes direct the formation of their corresponding stages.
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the typical story within the Hemimetabola is for nymphs and...
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Dec 2, 2019 · The larval form, then, arises from the arrest of ancestral patterns of tissue growth and patterning. The structures that are organized prior to the arrest are adapted to the larval form, while the remainder of the primordium is carried forward to contribute to the adult system (Figure 2 A).
- James W. Truman
- 2019
- 1 – Butterfly Egg. Save. Black Swallowtail Egg. The butterfly egg is spherical or ovate shaped, varying in color and size. It is covered by chorion, a hard shell that protects the egg, and is lined with a waxy layer that prevents dehydration.
- Stage 2 – Butterfly Larva (Caterpillar) Save. Black Swallowtail Larva. The larva stage of the butterfly’s life cycle is a time for growth. It feeds on its host plants, ranging from a single plant species to many different species.
- Stage 3 – Pupa (Chrysalis) The pupa stage of the butterfly’s life cycle is a time for a complete change. The pupa, also known as a chrysalis, is a vessel in which the caterpillar changes into a winged butterfly.
- Stage 4 – Adult Butterfly. The adult stage of the butterfly’s life cycle is a time for reproduction. The adult is also known as an imago; they have fully developed wings and are sexually mature.
Dec 21, 2018 · Larva (Larval Stage) Once development within the egg is completed, a larva hatches from the egg. In butterflies and moths, we also call the larvae (plural of larva) by another name—caterpillars.
A butterfly pupa, also called a chrysalis, forms a cuticle that encloses its head and body to shield against extreme temperatures, parasites, and drying out. During metamorphosis, body tissue breaks down and reforms as wings, legs, and other adult parts. Edward K. Boggess/USFWS/WikiMedia Commons.
Dec 2, 2019 · The larval form, then, arises from the arrest of ancestral patterns of tissue growth and patterning. The structures that are organized prior to the arrest are adapted to the larval form, while the remainder of the primordium is carried forward to contribute to the adult system (Figure 2 A).
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The larval stage is dedicated to growth, as the caterpillar consumes plant material to store energy for the upcoming transformation. The pupal stage is a period of metamorphosis, during which the caterpillar restructures into an adult butterfly within the protective chrysalis.
