Protrusion like the horn of the first instar larva of a dragonfly
The final renewal day of this page is January 28, 2005.
The first instar larvae of
the dragonflies of several species have a protrusion like the horn to the head.
This protrusion becomes more big when it becomes a second instar larva. However,
this protrusion is fading away as a larva grows. This protrusion does not have
an official name and even the work is not clear. This protrusion appears in the
short period of while when becoming a first instar larva from a prolarva, when a
dragonfly incubates. The species that has such a protrusion in Zygoptera is less
compared with Anisoptera.
However, this protrusion is seen with Platycnemididae in the dragonfly
that belongs to Zygoptera. Also, this protrusion is seen to Coenagrionidae of
several species. This protrusion is seen with Sinictinogomphus clavatus,
Ictinogomphus pertinax of Gomphidae.
Also there are comparatively many species that have the protrusion that is
conspicuous to Libellulidae, Corduliidae. There is a big protrusion in an
occipital lobe in Aeschnophlebia anisoptera, Aeschnophlebia
longistigma, Boyeria maclachlani ofAeshnidae. The protrusion of
Boyeria maclachlani is in the position even if it becomes a fainal instar
larva.
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Size of the eggs of 22 species of dragonflies that used it in this page
Species | Adult | Egg | |
Length(mm) | Immediately after oviposition (mm) | Hatching several hours ago (mm) | |
Mortonagrion selenion | 27.0 | 0.85~0.17 | 1.00~0.22 |
Ceriagrion melanurum | 38.5 | 0.95~0.20 | 1.07~0.25 |
Platycnemis foliacea sasakii | 37.0 | 1.02~0.20 | 1.14~0.25 |
Platycnemis echigoana | * | * | 1.26~0.24 |
Copera annulata | 42.5 | 1.18~0.19 | 1.30~0.24 |
Ictinogomphus pertinax | 74.5 | 0.75~0.40 | 0.78~0.47 |
Sinictinogomphus clavatus | 78.5 | 0.81~0.35 | 0.81~0.43 |
Boyeria maclachlani | 83.5 | 1.84~0.38 | 1.92~0.50 |
Aeschnophlebia longistigma | 70.5 | 1.51~0.33 | 1.74~0.44 |
Aeschnophlebia anisoptera | 77.0 | 1.56~0.37 | 1.72~0.47 |
Epitheca marginata | 51.5 | 0.73~0.36 | 0.86~0.46 |
Epophthalmia elegans | 82.5 | 0.48~0.27 | 0.57~0.33 |
Cordulia aenea amurensis | * | * | 0.77~0.43 |
Nannophya pygmaea | 19.0 | 0.42~0.26 | 0.45~0.34 |
Deielia phaon | 41.0 | 0.55~0.27 | 0.61~0.34 |
Sympetrum striolatum imitoides | 44.0 | 0.55~0.35 | 0.61~0.43 |
Sympetrum depressius culum | 34.5 | 0.55~0.31 | 0.59~0.36 |
Sympetrum frequens | 39.5 | 0.58~0.32 | 0.61~0.38 |
Sympetrum kunckeli | 34.5 | 0.52~0.32 | 0.53~0.38 |
Sympetrum croceolum | 37.5 | 0.58~0.33 | 0.58~0.38 |
Sympetrum uniforme | 47.0 | 0.47~0.28 | 0.52~0.35 |
Pseudothemis zonata | 43.5 | 0.66~0.30 | 0.71~0.37 |
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