Arctonoe Chamberlin 1920

Actonoe fragilis on the ray of its host seastar, Evasterias troschelii. (Photo by: Dave Cowles, July 2005)

In this closeup of the head end, the elytra which are widely spaced dorsally are visible. An elytrum is covering the head.

Here is Arctonoe vittata as it is usually seen in its host, Diodora aspera. Photo by Dave Cowles, July 2007

Here an individual reaches out from under Diodora aspera and explores the nearby environment. Photo at Swirl Rocks by Dave Cowles, June 2011

Arctonoe vittata symbiont with Diodora aspera, from Sares Head, WA. Scale is cm divided into mm. (Photo by: Dave Cowles, July 2006)

The edges of the elytra on this species are smooth, as seen in this closeup photo. This individual also has a red spot on each elytrum. Ricketts et al. says all members of the species have this spot (but that A. vittata do not), while O'Clair and O'Clair say that some individuals may not have the spot.

Arctonoe pulchra, about 2 cm long. Was living on the sea cucumber Parastichopus californicus caught near Rosario. (Photo by: Dave Cowles, July 2006)