Looks a bit like Siphlonurus...
Yes, and frankly more than a bit.:) Siphlonurus
is certainly another possibility and they are far more common. They can also have noticeable gill tracheation but they (gills) are shaped entirely different than Siphloplecton
(heart shaped, much wider at the apex and doubled up) at least on the first few segments. The margins of siphlonurid gills are clearly noticeable with some cloudiness to the membranes, whereas Siphloplecton's
are so transparent that in the right lighting they look just like old dead branches waving in the water. The gills in this photo certainly look to be denser in the first couple of segments, signaling Siphlonurus
. Like the claws though, they can't really be made out. The heavy tracheation and lack of sclerotized band on the gill margins definitely rules out the similar looking ameletids, so it's between these two...
Looking directly down, Siphlonurus
usually has tails approaching abdominal length with the abdomen comprising a little more than two thirds total body length. Siphloplecton
on the other hand, will have tails substantially shorter then abdomen length and the abdomen will take up as much as 3/4 total body length. The angle of the photo coupled with the fore lengthening affect of the body parts closest to the lens makes it difficult to tell. It's hard to describe, but the two have distinctly different silhouettes. Here are two examples that John can use to perhaps jog his memory.