juangill's Identifications

Empty shell of a Moon Snail (Family Naticidae) found on sandy substrate at very low tide in Laguna San Ignacio.

Link to confirmed observation of Notocochlis chemnitzii https://www.inaturalist.org/observations/151411258

INaturalist Project: Moluscos de México https://www.inaturalist.org/projects/moluscos-de-mexico?tab=species

Notocochlis chemnitzii is a marine gastropod in the Moon Snails (Naticidae) family.
"Notocochlis chemnitzii, or Chemnitz' moon snail, is a species of gastropod mollusc. The shell is smooth. There are four to five whorls with a short spire. It is grayish-blue to grayish-yellow, with arrow-shaped bands of brown and white. Some individuals may have a white band on the upper part of their whorls. The interior of the shell is brown. The shell has a maximum length of 33 mm (1.3 inches) and a diameter of 31 mm. The operculum is white and smooth.
These snails are found from Baja California Sur to Peru, including the Gulf of California. This species is also found in the Galapagos Islands. They live in the intertidal zone, down to 3 m (10 ft) deep, on sand and mud flats.
This moon snail preys on small bivalves. It is actively mobile, hunting on soft seabeds for buried clams. It uses an abrasive appendage called a radula to drill into the shells of small clams. Once inside, it secretes digestive fluids and then feeds on the clam slurry that results." https://www.inaturalist.org/taxa/1220603-Notocochlis-chemnitzii

"Naticinae are a subfamily of medium to large-sized predatory sea snails, marine gastropod molluscs in the family Naticidae, the moon snails.
The Naticinae are characterized by their calcareous operculum and by the presence of a distinct funicle within the umbilicus, which is observable in most species. It is mainly a tropical group, which is brightly colored and patterned." https://www.inaturalist.org/taxa/1067247-Naticinae

It is in the Littorinimorpha Order. Littorinimorpha is a large order of snails (gastropods) consisting primarily of sea snails (marine species), but also including some freshwater snails (aquatic species) and land snails (terrestrial species).

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Marine Life Resources:

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

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

The Living World of Molluscs (marine and terrestrial) https://molluscs.at/index.html

Molluscs: MolluscaBase https://www.molluscabase.org/index.php

Abalone Identification Guide: https://wildlife.ca.gov/

Limpets - cap-shaped snails: SEANET Hopkins Marine Station https://seanet.stanford.edu/Limpets
Limpet Characteristics and I.D. SEANET Hopkins Marine Station: https://seanet.stanford.edu/limpet-table

Field Guide to Seaweeds of the Pacific Northwest, Dr. Bridgette Clarkston, Harbour Publishing, 2015

Algaebase https://www.algaebase.org/

Pacific Northwest Shell Club http://www.bily.com/pnwsc/web-content/Northwest-Shells.html