Cephalopod | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-10-04

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Cephalopod


00:01:01 1 Distribution
00:02:01 2 Biology
00:02:09 2.1 Nervous system and behavior
00:03:34 2.2 Senses
00:03:55 2.2.1 Vision
00:06:01 2.2.2 Photoreception
00:06:37 2.2.3 Hearing
00:06:49 2.3 Use of light
00:07:40 2.4 Coloration
00:08:36 2.5 Ink
00:09:49 2.6 Circulatory system
00:10:23 2.7 Respiration
00:11:43 2.8 Locomotion and buoyancy
00:15:55 2.9 Shell
00:17:41 2.10 Head appendages
00:19:17 2.11 Feeding
00:20:33 2.11.1 Radula
00:21:40 2.12 Excretory system
00:22:57 2.13 Reproduction and life cycle
00:24:13 2.13.1 Sexual maturity
00:25:13 2.13.2 Fertilization
00:26:59 2.13.3 Male–male competition
00:28:02 2.13.4 Mate choice
00:29:07 2.13.5 Sexual dimorphism
00:29:44 2.13.6 Embryology
00:30:39 2.13.7 Development
00:31:23 3 Evolution
00:35:31 3.1 Phylogeny
00:36:38 3.2 Taxonomy
00:39:47 3.2.1 Suprafamilial classification of the Treatise
00:41:37 3.2.2 Shevyrev classification
00:43:44 3.3 Cladistic classification
00:44:17 4 In culture
00:46:10 5 See also



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SUMMARY
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A cephalopod () is any member of the molluscan class Cephalopoda (Greek plural κεφαλόποδα, kephalópoda; "head-feet") such as a squid, octopus, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles (muscular hydrostats) modified from the primitive molluscan foot.  Fishermen sometimes call them inkfish, referring to their common ability to squirt ink. The study of cephalopods is a branch of malacology known as teuthology.
Cephalopods became dominant during the Ordovician period, represented by primitive nautiloids. The class now contains two, only distantly related, extant subclasses: Coleoidea, which includes octopuses, squid, and cuttlefish; and Nautiloidea, represented by Nautilus and Allonautilus. In the Coleoidea, the molluscan shell has been internalized or is absent, whereas in the Nautiloidea, the external shell remains. About 800 living species of cephalopods have been identified. Two important extinct taxa are the Ammonoidea (ammonites) and Belemnoidea (belemnites).