Online Encyclopedia

SUBORDER 2

Online Encyclopedia
Originally appearing in Volume V05, Page 702 of the 1911 Encyclopedia Britannica.
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SUBORDER 2. OCTOPODA.—Only four pairs of arms, all similar and longer than the body. Body short and rounded aborally. the Cretaceous rocks of Lebanon. (After H. Woodward.) Suckers sessile. Heart not contained in coelom. No nidamentary glands. Tribe 1. Leioglossa.—No radula. Arms united by a complete membrane. Fins on sides of body. Fam. Cirrhoteuthidae. Tentacular filaments on either side of the suckers. Cirrhoteuthis, pallial sac prominent, fins large, pelagic. Opisthoteuthis, body flattened, with small fins, deep-sea. Vampyroteuthis, four fins. Palaeocto pus, fossil, Cretaceous. Tribe 2. Trachyglossa.—Radula present. No fins. Fam. 1. Amphitretidae. Arms united by membrane; funnel attached to mantle, dividing the pallial aperture into two. Amphitretus, pelagic. Fam. 2. Alloposidae. All arms united by membrane; mantle joined to head by dorsal band and two lateral commissures. Alloposus, pelagic. Fam. 3. Octopodidae. Arms long and equal, without membrane; hectocotylus not autotomous. No cephalic aquiferous pores. Octopus, two rows of suckers on each arm, British. Eledone, single row of suckers on each arm. Scaeurgus. Pinnoctopus. Cistopus. Japetella. Fam. 4. Philonexidae. Hectocotylus autotomous; arms unequal in size; aquiferous pores on head and funnel. Tremoctopus, two dorsal pairs of arms united by membrane. Ocytho, without interbrachial membrane. Fam. 5. Argonautidae. Hectocotylus autotomous; no inter- . brachial membrane; extremities of dorsal arms in female expanded and secreting a shell; males very small, without shell. Argonauts.
End of Article: SUBORDER 2
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