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George Titus Ferris, Wonders of marine life. With ninety-five illustrations (1894)
(via scientificillustration)
Earnst Haeckel’s Christmas Cards
All the sweet things that the squiddies,
Twittering in the dewy spray,
Wish each other in the springtime,
I wish you this happy day.Marine themed Christmas cards from Earnst Haeckel, the eminent German biologist, naturalist, philosopher, physician, professor and artist who discovered, described and named thousands of new species, mapped a genealogical tree relating all life forms, and coined many terms in biology, including anthropogeny, ecology, phylum, phylogeny, stem cell, and the kingdom Protista. [Wikipedia]
Advent Calendar of Oddments 2012: December 16th
Merry Squidmas…
or - Jelly Fishmas
(via scientificillustration)
Artist: Peter Stebbing
Russell, F. S. and Yonge, M. (1975). The Seas: An introduction to the study of life in the sea. New York: Frederick Warne & Co Inc.
Limbs of the Cephalopoda
Whether squids, octopuses, and nautilus have “arms” or “tentacles” is often simply a matter of semantics, but the most accepted definitions (from what I’ve found) tend to define the “arm” as a tapered limb, with two rows of suckers along its entire length. “Tentacle” is typically a length of tapered limb with no suckers, leading to a distal club-like appendage, covered in suckers.
One exception would be limbs in the nautilus - they have up to 90 un-suckered limbs, but their limbs are called “tentacles” by those who study them, even without the terminal club.Images:
Top right: Octopus vulgaris and detail of beak and arms
Top left: Detail of tenticular clubs in squid, from the Expedition of the Valdivia
Bottom right: Arm of Illex illecebrosis (Northern Shortfin Squid)
Bottom left: Tentacle of Illex illecebrosis
