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Cephalopods, as the name implies, have muscular appendages extending from their heads and surrounding their mouths. These are used in feeding, mobility, and even reproduction. In coleoids they number eight or ten. Decapods such as cuttlefish and squid have five pairs.
Georges Cuvier's original illustration of an octopus hectocotylus, which he named Hectocotyle octopodis. A hectocotylus (pl.: hectocotyli) is one of the arms of male cephalopods that is specialized to store and transfer spermatophores to the female. [1]
Teuthology (from Greek τεῦθος, "cuttlefish, squid", and -λογία, -logia) [1] is the study of cephalopods, which are members of the class Cephalopoda in the phylum Mollusca. Some common examples of cephalopods are octopus, squid, and cuttlefish. Teuthology is a large area of study that covers cephalopod life cycles, reproduction ...
Likewise, male cephalopods have only a single testicle. In the female of most cephalopods the nidamental glands aid in development of the egg. The "penis" in most unshelled male cephalopods is a long and muscular end of the gonoduct used to transfer spermatophores to a modified arm called a hectocotylus. That in turn is used to transfer the ...
The study was focused on early cephalopod diversification in the Late Cambrian and Ordovician, and did not discuss in detail the origin of post-Ordovician groups. The following is a simplified version of their cladogram , showing early cephalopod relationships to the order level (although various isolated families also originated during this ...
Reproduction of the vampire squid is unlike any other coleoid cephalopod; the males pass a "packet" of sperm to a female and the female accepts it and stores it in a special pouch inside her mantle. The female may store a male's hydraulically implanted spermatophore for long periods before she is ready to fertilize her eggs. Once she does, she ...
In most cephalopods, such as octopus, squid, and cuttlefish, the hyponome is a muscular tube. The hyponome of the nautilus differs however, in that it is a one-piece flap that is folded over. Whether ammonites possessed a hyponome and if so what form it may have taken, is as yet not known.
Like other cephalopods, the Caribbean reef squid is semelparous, dying after reproducing. Females lay their eggs then die immediately after. The males, however, can fertilize many females in a short period of time before they die. Females lay the eggs in well-protected areas scattered around the reefs.