1-3-2 Nilotanypus Group （Ｔａｎｙｐｏｄｉｎａｅ−Ｐｅｎｔａｎｅｕｒａ group)
（dorosomental teeth absent. ligula 5 teeth. basal segment of maxaillaly
palp 1.）
return to Pentaneura group
| ・row of teeth of ligula ・direction of inner tooth |
basaltooth of mandible | number of pecten hypoharyngis |
maxillary palp b-seta |
antennal ratio ant./head |
procercus:height/diameter other characteristics |
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| Nilotanypus | ・central tooth longest ・straight |
slightly large | ５〜６ | ２ segments | 2.5-3.0 3/5 |
３〜４ anal tubules very long |
| Natarsia | ・concave or straight ・straight |
very large | about １５ |
２ | 1.8-3.2 1/3-2/5 |
３〜６ |
| Larsia | ・concave ・straight |
large | １７ coner tooth big |
２ | 3.4-4.0 1/2〜3/5 |
５ |
| Zavrelimyia | ・central tooth longest or straight ・straight |
large | １５〜１６ coner tooth big |
２ | 2.1-2.4 1/2-3/5 |
４ |
| Telopelopia | ・concave ・curved outwards |
large | about ２２ | ２ | 3.4-3.8 1/2 |
２〜３ |
| Trissopelopia | ・concave ・curved outwards |
large | １５〜２０ coner tooth big |
２ | 2.5-3.5 1/2 |
２〜３ ring organ of maxilla somewhat proximal to middle |
Pentaneurella |
・concave ・curved outwards |
small | １２〜１５ | ２ | .25-3.5 1/2-3/5 |
２〜３ |
| Meropelopia | ・concave ・curved outwards |
small | ２２〜２５ | ２ | 3.8-4.5 2/5-1/2 |
２.５〜３ ring organ of maxilla at base of apical 1/3 |
| Arctopelopia | ・concave ・curved outwards |
small | ２０ | ２ | 4.1-5.3 2/5-1/2 |
２ ring organ of maxilla at base of apical 1/3 |
| Rheopelopia | ・concave ・curved outwards |
small | １９〜２０ | ３ | 3.5-3.7 1/3-1/2 |
２〜4.5 basal tooth and inner teeth of mandible very small, not easily seen |
| Conchapelopia | ・concave ・curved outwards |
small | １７〜１９ | ３ | 3.0-4.0 2/5-3/5 |
2.5〜４ basal tooth and inner teeth of maandible small but clearly seen |
＊ 上表のデータは手元にあるサンプルを基にしたもの
Larva small size. They inhabit in the sandy pebble bottom in nomal or rapid flow .Nilotanypus is distributed over the country widely. Some of them all claws of posterior parapod with serrated , some 1 or 2 claws serrated .
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| Middle tooth extending beyond other teeth. Other 4teeth about equal size. Paraligyla bifid . Pecten phypopharyngis with 5〜7 teeth. | Antenna with 4 segments., ３／５ for head length. antenal ratio 2.4 〜3.3. |
Mandible curves gently. basal tooth and inner teeth large both. |
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| Body length 2.5〜 ３mm . pale yellowish green, semitransparent. Cephalic index 0.5〜0.56 .Without fringe of swim-setae. Dorosomentum without teeth . Ｍ appendage triangle. Granulose band of pseudoradula not finely . |
Anal tubules long and slender , about 1.5〜２ times of posterior parapod. Height of procercue ３〜４ times of diameter. with 7 anal setae, about 6times of procercus. |
There are many spacies of Natarsia . They are distributed over the country widely.。
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| 5 teeth of ligula concave( upper photo.) or straight (following fig..). | Basal tooth of mandible very large. |
Dorsomentum without teeth (?) Pseudoradula broad , granulation fine and uniform. |
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・the latter half of head brown in them. ・Dorsomentum without tooth. Pseudoradula broad , granulation fine and uniform.偽 ・Antenna with 4 segments, kength 2times of mandible.. Antenal ratio 1.8〜3.2. ・Anal tubules slender and long cone. Procercus long. (see right photo.) |
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Larsia
Body length about ４mm. A livimg body brown spotty and translucent.
3 or 4 pairs of bristle on each body segments.
Takahasi river (Okayama pref.) Mozuri river (Shizuoka pref.) They inhabit
in the cool and clear water area.
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| 5 teeth of ligula concave , outer teeth lager than inner teeth ,
Inner teeth straight. Paraligula bifid. Pecten phypopharyngis with 11〜12 teeth , inner several teeth large. |
Mandible curved gently. inner teeth very small, basal tooth large. | |
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| Antenna with 5 segments. Antennal ratio 3.4〜3.5. 3 rd.and 4 th.segment almost equal length. |
Body length ６〜６.５mm. a living body color light greenish brown. Without
bristle on body segments.
I caught 2 species , Yakusima Iland and Kumano river (Nara pref.)
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| 5 teeth equal length , inner tooth straight , outer teeth brown , other teeth light yellow. Ligula thin toward the lower part from the upper. The upper part the twice of lower. Paraligula bifid. Teeth of pecten hypopharyngis 10 or more. Several teeth of inner side large . | Antenne with 4 teeth. Length 1/2 or more of head. Antennel ratio
2.2〜2.4. 2nd segment long, 3rd, 4th segment very short. |
Mandible curved gently . Both basal tooth and inner teeth large . |
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・5 teeth equal length ・Mandible curved gently . Both basal tooth and inner teeth large ・Maxilla: ring organ of basal segment of palp in apical 4/5. b-seta 2 segmented. ・b-seta 2 segmented. ・Lengthof procercus 4 times of diameter. anal setae 7. Anal tubules sharp spindle shape. ・1 or 2 claws of posterior parapod with strongly serrated inner margin. |
Body : ６〜９mm. , light yellow. Without fringe of swim setae. They are distributed over the country widely.
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| Basal tooth of mandible not large but clearly | 5 teeth of ligula concave . inner teeth curved to outwards . All teeth comparatively short. Pecten hypopharyngis about 20 , 3 teeth at corner large. |
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・Antenna : 4 segments, half of head, 3 times of
mandible . Antannal ratio 3.5〜 3.8. ・Anal tubules spindle shape. The height of procercus 3 times of diameter. ・Anal setae. .7times of procercus. |
Body length ４〜６mm. Without fringe of swim setae . A living body color light yellow 〜yellowish grre . Several species caught in the country.
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| 5 teeth concave slightly . iInner teeth curved to outwards . Paraligula bifid . Pectenhypopharyngis about 20, 2〜3 teeth at corner large . | Dorsomentum teeth absent . M-appendage triangle . Pseudoradula a uniformly broad band : granuration arranged 10 rows in parallel. |
Mandible curved gently . Basal tooth large . Inner teeth slightly large.全 |
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1 Antenna : 4 segments , Antennal ratio 3〜4 . 2.5〜３ times of mandible. 2 Ligula and dorsomentum 3 mandible 4 maxilla 5 M-appendage 6 Anal tubules 7 Claws of anterior parapod 8 procercus : Anal setae 7. 9 Claws of posterior parapod |
A living color light grrenish brown . Each body segment with simple bristles. They live in various area ; nomal or rapid flow. etc. .
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| 5 teeth concave slightly , inner teeth curved outwards slightly. Paraligula bifid. Pectenphypopharyngis with 10 or more teeth. | Lower half of mandible broad .Both 1 inner tooth and basal tooth small but clear . | |
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1 Antenna : 4 segments, antannal ratio 2.6〜３. 2 Ligula 3 Mandible 4 Maxilla 5 M-appendage 6 Anal tubules 7 procercus ; height 2.5 times of diameter . 7 anal setae 8 Claws of anterior parapod 9 Claws of posterior parapod |
Body length ５〜７mm . A living body color light green 〜brown , translucent.
They are distributed widely over the country. 。
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| 5 teeth concave slightly . Outer teeth large , inner teeth curved outwards . Paraligula bifid. Pectenphypopharyngis with 20〜24 teeth. | Mandible ; both inner tooth and basal tooth very small. | M-appendage : Pseudoradula a uniformly broad band : granuration arranged ７〜10 rows in parallel. |
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1 antenna ; 4 segments, half of the head length. ANtenal ratio
3.8〜 4.4. 2 Ligula 3 Mandible 4 Maxilla ; b-seta 2 segments, ring organ of basal segment upper 1/3 5 M-appendage 6 claws of anterior parapod 7 anal tubules 8 claws of poterior parapod |
Arctopelopia is distributed widely over the country. I comfirmed 3 species so far.
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| 5 teeth concave slightly . Inner teeth curved outwards . Paraligula bifid. Pectenphypopharyngis with 20 or more teeth. | Mandible ; both inner tooth and basal tooth very small. | M-appendage : Pseudoradula broadened in middle.: granuration in ７〜10 in parallel rows.. |
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１：antenna 4 segments、 length 0.45 times of head antnna ratio4.1〜4.3. ２：ligula: 5 teeth concave slightly . Inner teeth curved outwards . Paraligula bifid. Pectenphypopharyngis with 20 or more teeth. ３：head ４：M-appendage ５：procercus:height a little less than 3 times of diameter. anal setae 7 ６：mandible。 ７：bristle on body segment ８：claws of posterior parapod, several claws brown・ ９：claws of anterior parapod |
Body length 4〜７mm . A living body color light green 〜brown , translucent
Bristles longer than diameter of body segment lie scattered on each
segment.
They are distributed widely over the country Rheopelopia has many points similar to Conchapelopia.
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| 5 teeth concave slightly . Inner teeth curved outwards strongly.. Paraligula bifid. Pectenphypopharyngis with about 20 teeth. | Maxilla ; b-seta 3 segments, ring organ of basal segment upper 1/3. | Mandible ; both inner tooth and basal tooth very small but clear .. |
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1 antenna :about half of head length. antenalratio 3.3〜3.8 2 Ligula 3 mandible 4 M-appendage 5 Maxilla : b-seta 2 segments 6 procercus: height 2〜4 times of diameter with 7 anal setae 7 claws of anterior parapod 8 claws of posterior parapod |
| M-appendage : Pseudoradula a uniformly broad band : granuration arranged about 10 rows in parallel. |
Many kinds belong to this genus. and their forms are various . Conchapelopiahas many points similar to Rheopelopia .Fringe of swim-seta absent.
Anal tubules long , shape corn.
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| 5 teeth concave slightly . Inner teeth curved outwards strongly.. Paraligula bifid. Pectenphypopharyngis with about 20 teeth. | M-appendage : Pseudoradula a uniformly broad band : granuration arranged about 6〜8 rows in parallel. | antenna : half of head length ,2 times of mandible Antannal ratio ３〜５ . |
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1 antenna 2 ligula 3 mandible 4 maxilla :b-seta 3 segments 5 bristle of body segment 6 claws of anterior parapod 7 claws of posterior parapod 8 procercus 9 anal tubules |
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