Hawaiian+Bobtail+Squid

=Hawaiin Bobtail Squid =

__Description of Habitat:__ Cephalopods occupy most of the depth of the ocean, from the abyssal plane to the sea surface.
==__Living Requirements:__ They feed by capturing prey with their tentacles, drawing it in to their mouth and taking bites from it. The Hawaiian bobtail squid (//Euprymna scolopes//) spends its days buried in the sand and hunts only at night. To camouflage itself in shallow, moonlit waters, it takes up luminescent bacteria that help it to blend into its environment. == ==__Life Cycle:__ The fertilised ovum initially divides to produce a disc of germinal cells at one pole, with the yolk remaining at the opposite pole. The funnel of cephalopods develops on the top of their head, whereas the mouth develops on the opposite surface. The shells develop from the ectoderm. They don't have a distinct larval stage they use processes called spawning and hatching. They can hatch in a few days, or take a year. The warmer the water, the faster they hatch. == ==__Male/Female Differences: __ The male fertilizes the female by breaking off a special arm, which then swims to the female and deposits spermatophores into her. In females the ink sac is hidden from view by a pair of white nidamental glands, which lie anterior to the gills. Females also have a large translucent ovary, situated towards the posterior of the visceral mass. Males do not possess these organs, but instead have a large testis in place of the ovary, and a spermatophoric gland and sac. == ==__Interesting Facts: __ Fishermen sometimes call them **inkfish**, referring to their common ability to squirt ink. Cephalopods are the only mollusks with a closed circulatory system. Some species of squid can swim at speeds up to 25 miles per hour, as fast as some sharks, but only in short spurts. == ==__Human Impact:__ The Hawaiian bobtail squid has several means of stealthy self- preservation. These squid are nocturnal, so if a human disturbs them during the day they come out, but try to stay hidden in the sand and if that doesn't work then they ink. ==

[]
==[] (VIDEO) ==