Identificaciones de hfb

Eccentric Sand Dollar (Dendraster excentricus) is a common, marine echinoderm in the Sand Dollars and Sea Biscuits (Luminacea) Superorder. A.k.a. Sea-Cake, Biscuit-Urchin, Western Sand Dollar, or Pacific Sand Dollar. "It is a flattened, burrowing sea urchin. A covering of tiny spines and tube feet gives a live individual a dark, velvety, purple color. Sand dollars are unable to right themselves if overturned, and eventually die. Dead sand dollars found on the shore are off-white with a 5-leafed pattern of tiny holes on the dorsal side. The larvae of echinoderms are ciliated, free-swimming organisms." https://www.inaturalist.org/taxa/117696-Dendraster-excentricus

My favorite examples of Eccentric Sand Dollar:
Tube feet still visible: https://www.inaturalist.org/observations/131419544
Red-striped Acorn Barnacle attached: https://www.inaturalist.org/observations/131484337

Beachcombers's Guide to Seashore Life of California, J.D. Sept, Rev. ed. 2009, p. 204.

SEANET Hopkins Marine Station for "Nearshore Plants and Animals of the Monterey Bay": https://seanet.stanford.edu/Echinoidea#Dendraster
Geographic range is coastline from Alaska to Baja California, Mexico. It is "oval & flat, 7 cm diameter; dark gray, brown, or purplish, covered with short club-tipped spines. Dead skeleton is white with distinctive petaloid pattern where respiratory tube feet project. Common, in dense aggregations on sand with moderate to strong water motion. Diet of particulate detritus, unattached drift algae & small motile prey such as larvae & copepods. Geogr. Range: Alaska to Baja."

SEANET Hopkins Marine Station for "Nearshore Plants and Animals of the Monterey Bay" https://seanet.stanford.edu/

Irene's (aparrot1) Profile Page on INaturalist listing Nature Resources (includes online references with links) for Plants, Birds, Fungi, Lepidoptera, Arachnids, Reptiles, Amphibians, Marine Life, Plant Galls, and more: https://www.inaturalist.org/people/3188668