Ｏrthocladius　group

３－６　Orthocladius group
　　（median tooth 1, lateral teeth 6pairs or more, SⅠ bifid）　　　　　　　　　　　　
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　return to　Orthocladiinae group

Orthocladius、　　 Cricotopus 、　　Ｐaratrichocladius

　

Orthocladius - Euorthocladius - Euductylocladius

Ｏｒｔｈｏｃｌａｄｉｕｓ includs following subgenus Ｅｕｄａｃｔｙｌｏｃｌａｄｉｕｓ,、subgenus Ｅｕｏｒｔｈｏｃｌａｄｉｕｓ. These morphological differences are shown in the following list.

	head color	mentum	pecten epipharyngis	mandible	body
*Orthocladius*	yellow ～yellowish brown	Mediantooth larger than 1 st lateral tooth. Lateral teeth 6 pairs .Seta submenti simple	3 slim scales	Tip 1／2～1／3 dark brown , other yellowish brown. Apical tooth nomal.	nomal
Eudactylocladius(A)	dark brown	Mediantooth larger than 1 st lateral tooth. Lateral teeth 6 pairs. Seta submenti simple.	3 slim scales	Almost of mandible black. Apical tooth nomal.	nomal
Eudactylocladius(B)	dark brown	Median tooth and 1 st lateral teeth are the same size. (cf. chart below). Lateral teeth 6 pairs. Seta submenti simple.	3 large scales fused at base.	Almost of mandible black. Apical tooth nomal.	Chest and abdominal first half very big.
*Euorthocladius*	light brown	Median tooth very wide. Lateral teeth ７～１０ pairs. Setae submenti divided into 2～several.	3 slim scales	Almost of mandible black. Apical tooth slim.	nomal

I have gotton about 70 or more kinds of Orthocladius larvae so far.


Orthocladius 、Eudylocladius(A)	Euductylocladius （Ｂ）	Euorthocladius(Orhtocladius)
		１　antenna ：:5segments . Lauterborn's organ 　　large. 　　antenna ratio varies ２　lateral teeth of mentum ：　　Orthocladius ６pairs 　　　Euorthocladius ７～１０pairs 　　　seta submenti divited into 2～5 ３　mandible ４　labrum：ＳⅠbifid ,pecten epipharyngis:3 long scales . ５　premandible: simple. ６　maxilla ７　claws (posterior parapod) ８　claws (anterior parapod) ９　anal tubules . ５～７　anmal setae :
*Orthocladius*	*Euorthocladius*

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Ｃｒｉｃｏｔｏｐｕｓ

I have gotton about 50 or more kinds of Cricotopus larvae so far.


	setae tuft	clenurates of outer margin
	1 Antenna 5segments, L b organ and style not 　　　large . blade not beyond the tip of antenna 　２　Lateral teeth of mentum with 6 pairs. 　　Ventromental plate slender. ３　Many of them with clenurates on the outer 　　　margin of mandible. ４　Labrum:ＳⅠbifid. 　ＳⅡsimple . 　　Pecten epipyaryngis 3 scales. 　　Premandible simple. ５　Setae tuft ( 4th～9th segment): ６　maxilla ７　Claws of anterior parapod ８　Claws of posterior parapod ９　Anal tubules	Cricotopus is different from *Orthcladius* at following points. １：Outer margin usually crenulate, Orthocladius lacking. crenulate various. ２：Pecten epipharyngis consistig of 3 scales, or a single scale( heart shape).in Isocladius ３：Abdominal segments usually with 1 pair of setal tufts .

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Paratrichocladius

・　Mentum: With 1median tooth and 6 pairs of lateral teeth; first lateral tooth broader in middle than at base( baloon shaped).
・Ａbout 10 kind of species　, distributed widely in the country.

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