Pecten excavatus

Pecten excavatus is a species of scallop, marine bivalve molluscs in the taxonomic family Pectinidae.

Pecten excavatus
Pected excavatus shell— left shell is shown in blue and is concave, right shell is shown in red and is highly convex
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Pectinida
Family: Pectinidae
Genus: Pecten
Species:
P. excavatus
Binomial name
Pecten excavatus
Anton, 1838
Synonyms
  • Pecten punctilatus Dunker, 1877
  • Pecten sinensis G.W Sowerby II, 1842

Shell description

In this species, the valves are greatly inequal and plano-convex in shape: the right valve is highly convex, and the left valve is correspondingly concave, an arrangement unusual within the scallop family. The valves are front-back symmetrical, however, and the ears are equal, convex, and rectangularly truncated.[1]

It can be distinguished from the very similar species Pecten albicans by the number of ribs present on either valve. P. albicans has in the range of seven to ten ribs with a mode of eight, while those of P. excavatus range from eight to eleven or more with an average number of ten.[2]

Distribution and habitat

This scallop prefers to inhabit fine, sandy bottoms 10-80 meters below the surface.[3]

gollark: Even a "turned off" one is still going to have a few things running, so it can detect the power button and possibly do wake-on-LAN.
gollark: It's computers all the way down, and they are probably not very secure computers.
gollark: And being a laptop, there's an "embedded controller" running the fans and whatever, and maybe even a computer thing managing the battery.
gollark: As well as that, the dedicated GPU is arguably a "computer" too, and it has at least one microcontroller on it for various things. Also, the internal keyboard and camera are connected over USB, which means they probably have their own microcontrollers.
gollark: I don't have one of those, but yes.

References
  1. Ralph Arnold (1906). "Pleistocene Pectens". The Tertiary and Quaternary Pectens of California. U.S. Government Printing Office. 47: 135.
  2. "Unknown". Japanese Journal of Geology and Geography. Science Council of Japan. 32: 13. 1961.
  3. "Pecten". Quarterly Journal of the Taiwan Museum. 33: 93. 1980.
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