|
File: <pyrgo1.ima.htm>
[For educational purposes
only] Terminology Glossary <Principal Natural
Enemy Groups > <Citations> |
Immature
Stages of Pyrgotidae
The egg Adapsilia
flaviseta Aldrich of the
Pyrgotidae (Fig. 187A) measures 1.3 mm. in length and 0.25 mm.in width, with
the posterior third drawn out to a narrow point. It is distinctly curved, and
the smoothly rounded anterior end bears a button‑shaped micropyle. The first‑instar larva is distinctly
segmented, widest in the mid‑abdominal region, with the caudal segments
much narrowed, the mouthparts much reduced, and the single pair of spiracles
of simple form. The second‑instar
larva is more robust and bears numerous papillae in a transverse band on each
segment. The anterior spiracles are simple and very small, whereas the posterior
pair (Fig. 187B) have two openings, one above the other, and are surmounted
by a heavy, dorsally directed hook or spine.
In the 3rd instar larva, the anterior spiracles (Fig. 187D) are
stalked and fan‑shaped, with many openings, whereas the posterior pair
(Fig. 187E), situated at the dorsal rim of a large median depression, are
very large and consist of three main lobes, with a dorsally directed hook or
spine at the inner dorsal margin.
They are markedly convex, the ventral lobe curved beneath the rim of
the depression. The puparium (Fig.
187F) is keel‑shaped and brown to reddish‑brown in color, with
the anterior spiracles stalked. The
median posterior cavity of the larva and puparium is common to a number of
species, though Davis stated that it is lacking in P. valida
Harr. Please CLICK on
picture to view details:
References: Please refer to <biology.ref.htm>, [Additional references may be found at: MELVYL Library] |
