Rhantus suturalis larve, abdomentip at watersurface 05-08-2007
Rhantus suturalis
"siphon" on tip of abdomen

Top picture: the tip of a larva's abdomen van een 2nd instar larva (moulted once). The short spines on the cerci (tail-appendages) in combination with the scarse longer hairs (setae) are specific for this species. The mirror image in the watersurface shows how the the tip of the abdomen pulls a dimple in the watersurface. Because of that, the top plate with the two ventilation openings lies dry above the water and makes contact with the air above.

Rhantus suturalis, third instar larva, cerci van boven 13-08-2007
enlarge Top view
Rhantus larva, tip of abdomen 05-08-2007 Rhantus larva, achterlijfspunt 13-08-2007
The third instar larva (moulted twice) has only the long hairs on the cerci, as may be seen on the picture at the left. At right the tip of the abdomen of a 2nd instar larva is put beside one of a 3d instar larva, at the same scale. On the right picture the course of the airduct is visible. The last segment of the 2nd instar larva is supposed to be relative wider and shorter than that of the 3d instar. That is not clearly visible here.

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All pictures on this site were made by Gerard Visser (Aadorp, Netherlands), unless stated otherwise. All rights remain with him. These pictures may not be used for purposes any other than private viewing or printing. Do NOT hardlink to these pictures or place them on other websites without the author's approval. Should you need them for purposes which include third parties, you must ask the author permission by e-mail. People, who want to use this pictures for exhibitions or publications or educative material are much encouraged to do so, after approval as mentioned and giving the normal credits.
© G.H. Visser 09-09-2007

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