and Sasa & Yamamoto (1977).
Also called Chironomus thmini (misspelling of thummi?) Tokunga 1940
and Chironomus riparius Sasa & Yamamoto 1977.
In BOLD Bin: BOLD:ACH4992
This is the same Bin as C. sulfurosus, which has 99.83% homology.
(based on Yamamoto 1990)
Adult:
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Female
Coloration almost the same as the male. Cercus brown.
Head: Antennal proportions: 134 : 88 : 106 : 100 : 244. AR - 0.57; A5/A1 – 1.82Frontal tubercle 12.5-17.5 µm long and 10.0-15.0 µm wide.
Palpal proportions (micron): 56 : 68 : 172 : 170 : 232; P5/P4 1.36; P5/P3 1.35. Vertex with 23-25 setae; Clypeus with 29-40 setae.
Wing length 2.2-2.9 mm, width 0.8-1.0 mm. VR 0.85 (0.76-0.89); squama with 14-24 setae.
Thoracic setae: acrostichals 9-18; dorsocentrals 19-34; prealars 6-9; supraalar 1; scutellars 21-41.
Leg proportions (micron):
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Pupa: Body dark brown, length 4.5-6.5 mm. Cephalic tubercles acutely pointed, with subapical spine. Abdominal segment II with a row of about 60 hooks, pedes spurii B developed. Postero-lateral spurs of segment VIII with 1-2 spines. Chaetotaxy and shagreen as shown in his figures.
Fourth instar larva: A small (length - 10 mm) thummi- or bathophilus-type larva, i.e. lacking lateral tubules. Anal tubules well developed, of a single lobe, dorsal pair shorter than the ventral pair, which are about 3/4 the length of the posterior pseudopods. Head uniformly dark brown.
Mentum of type I, in fact Yamamoto’s illustration suggests that the 5th and 6th laterals are reduced, central tooth could be type III. Ventromentum not described and illustrated by olny a vague outline, which indicates they are longer than the mentum width.
Pecten epipharyngis with about 20 uneven but pointed teeth, suggesting possibly type B. Premandible with 2 teeth, outer tooth shown as much longer than the inner tooth and only relatively narrower.
Antenna with 5 segments, relative lengths of segments 42 : 10 : 2 : 4: 2 ; segment A1 with a ring organ at basal 2/5. Antennal blade long, reaching the base of 5th antennal segment, accessory blade indistinct. AR about 2.3.
Distance between the S4 setae greater then that between the antennal bases.Mandible possibly of type IIIC, furrows not illustrated or recorded; 3 spines on inner margin; Pecten mandibularis with 10 taeniae.
Cytology: no information, but if related to C. acerbiphilus is likely to be pseudothummi cytocomplex.
Found: Japan - Mount Unzen, Nagasaki Prefecture, Kyushu. (Type locality).
DNA sequence: There is one accession from GenBank which could be this species.
Other sequences from GenBank or BOLD appear to be misidentified:
GenBank accession number AB704937 is actually for a species of Kiefferulus
That in the BOLD database (in BOLD Bin: BOLD:ACH4991) appears to be a species of Glyptotendipes, possibly G. tokunagai.
Noted by Yamamoto (1990) to be closely related to C. acerbiphilus and C. sulfurosus.The adult can be distinguished from C. acerbiphilus by the higher LR, and the male from C. sulfurosus by the more slender anal point.
The larva can be distinguished from C. acerbiphilus and C. sulfurosus by the uniformly dark head capsule.
DNA analyses:
If correctly identified, the barcode for C. sulfurosus has 99.73% homology, while C. acerbiphilus is in a different BOLD Bin: BOLD:AAJ4234.
MtCOI: there are sequences in GenBank: Accessions AB704938 and LC377640 (mined to BOLD database).