３－２ Corynoneura group （ with long antenna） to Orthocladinae group
Corynoneura Thienemanniella Rheosmittia
| mentum | antenna | characteristic | |||
| Corynoneura | 3 median teeth the same size, or central tooth small or absent. 5 pairs of lateral teeth. |
1.0～1.5times of head capsule.. 4 segments. segment 2 and 3 dark brown. |
Variably developed seta (usually plumose) arising from ventral basal side of posterior parapod, |
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| Thienemanniella | 3 median teeth the same size, or central tooth small or absent. 5 pairs of lateral teeth. |
0.4～0.8 times of head capsule. 5 segments. segment 3 long or short. |
Strong, simple seta arising from ventral basal side of posteriorparapod |
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| Rheosmittia | trapezoid, with 8～10 teeth in upper side, and 4～5pairs of rateral teeth in oblique sides |
0.5～1.2 times of head capsule. 5 segments. segment 2 as long as basal segment. |
Abdominal segment violet spotted premandible with up to 10 teeth . |
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Corynoneura
Corynoneura larvae distributed widely in the country , in the stream and
pool . 10 or more species occurred in Japan.。
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| Small size larvae , less than 3 mm. Antenna with 4 segments , 1.0～1.5 times
of head capsule. |
3 median teeth the same size, or central tooth small or absent. 5 pairs of lateral teeth. Ventromental plate absent. |
Antenna with 4 segments. Antennal ratio 0.7～～1.0. Segment 4 very short. Blade less than 1/2 of segment 2. Lauterborn's organ small. |
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・Mandible: Apical tooth the same size or smaller than the 1 st. inner
teeth. Inner teeth 4. ・SⅠweak and simple. ＳⅡslightly strong and long. ・Pecten epipharyngis 3 long simple scales , with two outer chaetulae laterals strongly modified (resembling 5 spines) ・Premandible simple spatula_shape.( with many minute teeth ?) |
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| Seta of ventral basal side of posterior parapod, |
Thienemanniella larvae are found widely from slow strem to fast , and rich in species
20 or more recognized in the country.
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| Small larvae, up to 2 mm. Antenna not longer than head capsule. | Median teeth 2 or 3, center tooth large ,small or absent. 5 pairs of lateral teeth. Ventromental plate poorly developed. | ・Mandible: Apical tooth subequal to first of 4 inner teeth. ・ＳⅠand ＳⅡsimple and weak. Pecten epipharyngis 3～5 triangular scales. Premandible with 1 apical tooth and long brush ・A strong , simple seta arises from ventral basal half of posterior parapod. Anal setae 4. |
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| We can see 2 types about antenna of Thienemanniella . 1. Segment 2 and 3 subequal in length , segment 4and 5 short. ( upper fig. left) 2. Segment 2 long, segment 3,4 and 5 short ( upper fig. right) Ring organ on basal part and and 2 weak setae on upper part of basal segment. |
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Small size larvae, about ３mm. Several species of Rheosmittia larvae occurred widely in the country, but the population not many.
Because the living body is spotted design of bluish violet like a lower
photograph, we can judge at a glance it with Rheosmittia larva.
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1 Antenna: ５ segments , segment 2 as long as first. One style apical
1/3 of segment 2 . Segment 3～5 short. Antannal ratio
0.7～1.5 . 2 Mentum :trapezoid, with 8～10 teeth in upper side, and 4～5pairs of rateral teeth in oblique sides ４ Mandible: With 5 inner teeth , someone with 7 teeth. ３ ＳⅠplumose ＳⅡstrong, simple Pecten epipharyngis 3 simple , long scales.上 Premandible :with up to 10 teeth. ５ Anal tubules long cnical. ６ Procercus with 4 anal setae. ７ Claws of posterior parapod ８ Claws of anterior parapod |
| Body segment 1～3 pale yellow, dorosal side of 4～12 segments spotted design of bluish violet . | ||
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| Antenna 0.9～1.2 times of head capsule. Inner teeth of mandible long. |