|
| |
| | NAUTILUS - LoveToKnow Article on NAUTILUS |
 | | A rgonauta is one of the Cephalopods in which the process known as hectocotylization of one arm is developed to its extreme degree, the arm affected becoming ultimately detached and left by the male in the mantle cavity of the female where it retains for some time its life and power of movement. | | | The hectocotylus or copulatory arm in the Argonaut is developed at first in a closed cyst (fig. |
|
http://64.1911encyclopedia.org/N/NA/NAUTILUS.htm
|
|
| |
| | TONMO.com Forums - Male or female?? |
| | you say a male is recognized by the hectocotylus (and I thought mary poppins had long difficult words :P) on the third arm. | | | Species where there is a hectocotylus, it is usually on the third arm. | | | In that case you have a male, if you dont see it, it may be a female or a male whose hectocotylus you cant see!!! |
|
http://www.tonmo.com/forums/showthread.php?t=1670
|
|
| |
| | Hectocotylus - Wikipedia, the free encyclopedia |
| | The term is also used to specifically refer to the greatly modified arm of Argonauta and allied genera. | | | A hectocotylus is one of the arms of the male of most kinds of cephalopods that is modified in various ways to effect the fertilization of the female's eggs. | | | Males generally form a new hectocotylus in each new season. |
|
http://www.wikipedia.org/wiki/Hectocotylus
|
|
| |
| | Octopus - Wikipedia, the free encyclopedia |
| | A few species have a fourth defense mechanism, in that they can combine their highly flexible bodies with their color changing ability to accurately mimic other, more dangerous animals such as lionfish and eels. | | | The hectocotylus is usually the third right arm. | | | In some species, the female octopus can keep the sperm alive inside her for weeks until her eggs are mature. |
|
http://en.wikipedia.org/wiki/Octopus
|
|
| |
| | Hectocotylus |
| | Hectocotylus (n.) One of the arms of the male of most kinds of cephalopods, which is specially modified in various ways to effect the fertilization of the eggs. | | | For people who have trouble spelling, this is the defintion of the term Hectocotylus | | | In a special sense, the greatly modified arm of Argonauta and allied genera, which, after receiving the spermatophores, becomes detached from the male, and attaches itself to the female for reproductive purposes. |
|
http://linkspider.serversystems.net/dictionary/lookup/hectocotylus
|
|
| |
| | Pharyngula::Octopus Sex |
| | Males did not distinguish between females or other males and copulated (defined as the insertion of the hectocotylus into the mantle cavity of another octopus) readily with both. | | | The arrow points to the male’s hectocotylus, which is being inserted into the female’s mantle cavity. | | | The initiation of physical contact was independent of sex, size or residency status, and there were no noticeable changes in behaviour such as sexual displays associated with courtship or aggression prior to contact. |
|
http://pharyngula.org/index/weblog/comments/octopus_sex
|
|
| |
| | Octopuses - Thinking Tentacles |
| | The argonaut, related to the octopus, during mating uses a hectocotylus, like other octopuses do. | | | Female squid often eating the smaller males this may be wise. | | | Unlike other octopuses, however, the argonaut separates the hectocotylus and pushes it towards the female. |
|
http://www.weichtiere.at/Mollusks/Kopffuesser/denkende_arme.html
|
|
| |
| | HECTOCOTYLUS |
| | English words defined with "HECTOCOTYLUS" : Hectocotyli, Hectocotylized. |
|
http://www.websters-online-dictionary.org/definition/HECTOCOTYLUS
|
|
| |
| | Interesting Species |
| | Such as with other cephalopods, this tentacle is called the hectocotylus. | | | The male argonaut, unlike its larger relatives, often leaves its hectocotylus behind, the latter finding its objective on its own. | | | The male argonaut is special because of its modified third tentacle which is kept in a pouch until needed. |
|
http://www.cagulhashotel.co.za/species/species.html
|
|
| |
| | Pyroteuthis addolux |
| | This species is most easily separated from other members of the genus by the arrangement of photophores on the tentacles and the structure of the hectocotylus. | | | Arm and tentacle armature is shown here although specific characteristics associated with these are not presently recognized except on the hectocotylus. | | | Each proximal hook small with primary cusp bearing smooth inner edge and short secondary cusp. |
|
http://tolweb.org/tree?group=Pyroteuthis+addolux
|
|
| |
| | TONMO.com Forums - Arm length = octo sex? |
| | This arm can also be considerably smaller than the third arm on the left side. | | | The hectocotylus can be hard to identify, but I've attached some sketches at least to help you look for it. | | | This is actually part of an unpigmented "tube" through which the spermatophores are passed down the hectocotylus. |
|
http://www.tonmo.com/forums/printthread.php?t=2033
|
|
| |
| | HECTOCOTYLIZED - Definition |
| | ( Zo [" o ] l.) Changed into a hectocotylus ; having a hectocotylis. |
|
http://www.hyperdictionary.com/dictionary/Hectocotylized
|
|
| |
| | And the Octopus said . . . . |
| | There are no suction cups at the tip of the arm where the hectocotylus resides. | | | Unfortunately, our octopus lost the tip of this arm before coming into captivity, likely do to predation. | | | We gave very little info about the octopus, only that the octopus was about a year to a year and a half old and that we didn't know the gender. |
|
http://journals.aol.com/ecori/AnimalSpirits/entries/971
|
|
| |
| | Untitled |
| | -males use a modified arm called the hectocotylus to insert the spermatophore into the female's body. | | | *it was first believed to be a parasitic worm and described as Hectocotylus, hence the name for the male arm. | | | The spermatophore is shaped like a baseball bat and consists of an elongated sperm mass, a cement body, a coiled spring-like ejaculatory organ, and a cap. |
|
http://www.colorado.edu/epob/epob4480tsai/Lecture25.html
|
|
| |
| | Class Cephalopoda 7 |
| | Males have a modified arm called a hectocotylus, which is used to pluck a packed of sperm called a spermatophore from their own mantle cavity and to insert it in the mantle cavity of the female. | | | The mating embrace is frequently violent in octopuses, and the hectocotylus arm often detaches inside the female and is never regenerated. | | | In terms of reproduction, coleoids have separate sexes and copulate during a head-to-head mating embrace. |
|
http://bioweb.uwlax.edu/zoolab/Table_of_Contents/Lab-5a/Class_Cephalopoda_7/class_cephalopoda_7.htm
|
|
| |
| | Mar-Eco - Cephalopods |
| | Many, though not all, cephalopod species exhibit external sexual dimorphism, either in structural or size differences. | | | Males of many forms possess a modified arm (hectocotylus) for mating. | | | The spermatophores may be implanted inside the mantle cavity, around the mantle opening on the neck, in a pocket under the eye, around the mouth, etc. The mode of reproduction and egg-laying is unknown for many forms, especially oceanic and deep-sea species. |
|
http://www.mar-eco.no/learning-zone/backgrounders/deepsea_life_forms/cephalopods
|
|
| |
| | Haliphron atlanticus |
| | The hectocotylus develops in an inconspicuous sac in front of the right eye which gives the male the appearance of having only seven arms (see below). | | | Females brood their eggs, which are attached to the oral side of the arm bases near the mouth (Young, 1995). | | | In Haliphron this is located beneath the right eye and due to the thick gelatinous tissue on the octopod, it is easily overlooked. |
|
http://tolweb.org/tree?group=Alloposidae&contgroup=Argonautoid_families
|
|
| |
| | Squids; Predator Par Excellence |
| | Squid usually breed in swarms of hundreds of animals; the frenzy may last several days. | | | After courtship displays, he inserts his hectocotylus into the female's mantle cavity and deposits the sperm near the opening of her oviduct. | | | During breeding, the male squid uses his modified fourth arm (hectocotylus) to obtain a sperm packet from an opening in his mantle cavity. |
|
http://www.csuchico.edu/biol/ncnhm/molluscs/pan5/page3.html
|
|
| |
| | argonaut: Definition and Much More From Answers.com |
| | The males have a modified arm called a " hectocotylus " that is used for sperm transfer to the female. | | | The females are only able to mate once in their lifetime, whereas the male is able to reproduce multiple times. | | | The males lack the dorsal tentacles used by the females to create their egg cases. |
|
http://www.answers.com/topic/argonaut-animal
|
|
| |
| | Take a Trip to an Octopus' Garden with Me |
| | The male develops a special organ, the hectocotylus, at the tip of one arm, usually the third right arm. | | | This hectocotylus is inserted into the female's mantle to deliver sperm packets. | | | Most species mate separated from each other by a short distance, sometimes even from one octopus den to another. |
|
http://mikejacobs.50megs.com/TakeATrip.html
|
|
| |
| | Octopods |
| | After laying clusters of fertilized eggs, the female directs a steadily lessening stream of cleansing, oxygenating water over them as she lays dying beside her future offspring. | | | Octopods breed discretely, often with only the male's specialized hectocotylus arm touching the female as it deposits sperm packets in her mantle cavity. | | | The hectocotylus of the tiny male breaks off in the female's mantle cavity during copulation, and was for centuries thought to be a parasitic worm of the female. |
|
http://www.csuchico.edu/biol/ncnhm/molluscs/pan5/page6.html
|
|
| |
| | South African Museum - The Diamond Squid |
| | As in many other kinds of squids, the male diamond squid has one of its arms modified to form a hectocotylus used during copulation to transfer spermatophores (complex packets of sperm) to the female. | | | In the diamond squid the left ventral arm (arm IV) is modified and is illustrated here for the first time. |
|
http://www.museums.org.za/sam/resources/marine/hectocot.htm
|
|
| |
| | 13000 New Marine Species Found In One Year |
| | It later turned out to be the hectocotylus of a male nautilus, the specialized arm that transfers sperm to the female. | | | A friend of mine who is a cephalopd expert described the hectocotylus as a "French tickler" (or should that be freedom tickler now?). | | | He found it wriggling around inside a female paper nautilus's body. |
|
http://www.scubaboard.com/archive/index.php/t-79377.html
|
|
| |
| | 10/5/04 |
| | h) sexes separate; copulate with hectocotylus; unusual development Internal fertilization using hectocotylus arm. |
|
http://www.siue.edu/~sasawye/380/inverte/lectures/Oct5.htm
|
|
| |
| | The Blue-Ringed Octopus |
| | Mating begins when an interested male approaches and starts caressing the female with his modified arm, the hectocotylus. | | | He then inserts the hectocotylus under the mantle of the female and the spermatophores are then released into the female's oviduct. | | | The female then lays ~100 eggs and guards them until they hatch ~50 days later. |
|
http://www.earlham.edu/~sheedjo/blue-ringedoctopus.htm
|
|
| |
| | Octopus at exZOOberance! |
| | A male interested in mating approaches a female just close enough to stretch out a modified arm, the hectocotylus, and caress the female. | | | This arm has a deep groove between the two rows of suckers and ends in a spoonlike tip. |
|
http://www.exzooberance.com/virtual%20zoo/they%20swim/octopus/octopus.htm
|
|
| |
| | Aquarium of the Pacific-Animal Database |
| | A mature male has a modified third right arm with a long specialized structure called a hectocotylus. | | | The female will only produce one nest in her life and will die soon after her eggs hatch. | | | The hectocotylus is used to deliver the spermatophores (sperm-filled sacs) to the female during mating. |
|
http://www.aquariumofpacific.org/ANIMAL_DATABASE/ADBindex.asp?id=18&cat=re
|
|
| |
| | IZ Facts - Cephalopods |
| | The male has a modified arm called a hectocotylus that he stretches out to the female and inserts into her mantle cavity. | | | The arm transfers spermatophores from a storage sac into her mantle cavity near the oviduct where the eggs are fertilized. | | | Some of the largest ones weigh up to 50kg and measure up to 3-5 meters total length. |
|
http://www.nmnh.si.edu/iz/cephalopods.htm
|
|
| |
| | The Sixth International: Sex, manual |
| | Squid are not the only creatures that employ this indirect and we might say manual method of insemination. | | | Instead, they have a pouch that opens into the mantle cavity, called Needham's sac, where spermatophores are stored, and they have a specially modified tentacle, the hectocotylus, which is used to reach into the sac, scoop out a spermatophore, and and place it inside the buccal or mantle cavity of the female. | | | Myers also told me something I did not know: |
|
http://www.6thinternational.org/2004/01/pharyngula.html
|
|
| |
| | Previous PhD projects |
| | Although superficially similar in appearance the species are discernible by differing hectocotylus and beak morphology. | | | turqueti has a short, blunt hectocotylus with a smooth inner surface. | | | Specimens from a survey in Cumberland Bay in 1987 and groundfish surveys in 1989, 1991 and 1994 were examined. |
|
http://www.abdn.ac.uk/~nhi904/eurosquid/phdprevious.htm
|
|
| |
| | Hectocotylus Plates of <I>Pterygioteuthis</I> spp. |
| | Black dots throughout the arm tissue are artifacts. | | | Right: Photograph of a cleared hectocotylus of P. | | | Skip to main content Go to table of contents Go to navigation for this section of the ToL site Go to quick links Go to quick search Go to detailed site links |
|
http://tolweb.org/notes/?note_id=1114
|
|
|
