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Lepisma, Iowa, March - Ctenolepisma lineata

Lepisma, Iowa, March - Ctenolepisma lineata
Ames, Story County, Iowa, USA
March 13, 2007
Size: 10 mm
Judging by size I'm going to say Lepisma on this guy... does anyone know how to tell Lepisma from Ctenolepisma other than size?

I'm suprised by how few pics we have of this species, considering we all have them in abundance in our houses.

Moved from Common Silverfish. I agree - this image was misplaced; general appearance and long appendages leaves little doubt that it is a Four-lined Silverfish.

the dorsal stripes on this one
make me suspect it isn't Lepisma saccharina, which looks more uniformly gray or silvery above, based on the linked images under Internet References on the species page.

This one looks more like the photos by Richard Leung here and Troy Bartlett here, which I think may be the Four-lined Silverfish (Ctenolepisma lineata).

To my eye, L. saccharina has smooth and close-fitting "plates" that wrap tightly around the domed thorax - which seems swollen or "bulked up", especially near the head. The image links and photos in the Guide also show a dorsal flap extending beyond the abdomen, which I haven't noticed in other species but maybe it's a difference between the sexes (?)

If that description fits L. saccharina, then the photos labeled Firebrat (Thermobia domestica) on pages 22 & 26 of Steve Marshall's book (1) look more like L. saccharina to me. Comments?

Perhapse a Four-Linned Silverfish?
Ctenolepisma lineata

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