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Alles weergeven op WikipediaColeoidea - Wikipedia
Coleoidea or Dibranchiata is one of the two subclasses of cephalopods containing all the various taxa popularly thought of as "soft-bodied" or "shell-less" (i.e. octopus, squid and cuttlefish). Unlike its extant sister group Nautiloidea, whose members have a rigid outer shell for protection, the ā¦ Meer weergeven
The earliest certain coleoids are known from the Mississippian sub-period of the Carboniferous Period, about 330 million years ago. Some older fossils have been described ā¦ Meer weergeven
ā¢ Class Cephalopoda Meer weergeven
Wikipedia-tekst onder CC-BY-SA-licensie Anatomy and evolution of the first Coleoidea in the Carboniferous
WEB31 jul. 2019 · Coleoids are characterized by internal shell (endocochleate), ink sac and arm hooks, while nautilids lack an ink sac, arm hooks, suckers, and have an external conch (ectocochleate).
- Auteur: Christian Klug, Neil H. Landman, Dirk Fuchs, Royal H. Mapes, Alexander Pohle, Pierre Guériau, Solenn...
- Publish Year: 2019
2.4 Coleoidea - Digital Atlas of Ancient Life
WEBThis deep-sea species possesses an internal, open-coiled shell that is used to maintain buoyancy. The animal itself swims in a vertical position, with the head pointed downward. For obvious reasons, the common name for ā¦
Mesozoic origin of coleoid cephalopods and their abrupt shifts of ...
WEB1 jan. 2022 · Coleoids have an internal shell (sometimes absent), 8 or 10 circumoral appendages, and a pair of ctenidia (Jereb et al., 2010, Hanlon et al., 2018). These cephalopods have a wide distribution in all oceans ā from the poles to the tropics ā on continental margins and in oceanic areas ( Hanlon and Messenger, 1996 , Jereb and ā¦
Fossil Focus: Coleoid cephalopods
WEBThe internal shell of coleoids is quite robust and has the highest preservation potential of any coleoid body-tissue. Most people have ā¦
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Cephalopod origin and evolution: A congruent picture emerging ā¦
WEB17 jun. 2011 · Coleoids (i.e. squids, cuttlefish and octopods) internalised their shells and, in the late Palaeozoic (ā¼276 Ma), diverged into Vampyropoda and the Decabrachia. This shell internalisation appears to be a unique evolutionary event. In contrast, the loss of a mineralised shell has occurred several times in distinct coleoid lineages.
The locomotion system of Mesozoic Coleoidea (Cephalopoda) and ā¦
WEB25 nov. 2015 · Abstract. A morphological comparison of shell-muscle contacts in coleoid cephalopods mainly from the Early Jurassic (Toarcian) Posidonia Shales of Holzmaden (Germany), the Middle Jurassic (Callovian) Oxford Clay of Christian Malford (UK), Late Jurassic (Kimmeridgian-Tithonian) plattenkalks of Solnhofen (Germany), and the Late ...
The shell structure and chamber production cycle of the ā¦
WEB12 okt. 2022 · The endocochleate coleoid cephalopod Spirula spirula, the only present-day representative of the order Spirulida, secretes a coiled shell consisting of a series of chambers divided by septa and connected by a siphuncle. It is the shell closest to those of Recent and extinct ectochleate cephalopods: nautiloids, ammonoids.
A Late Carboniferous Coleoid Cephalopod from the Mazon Creek ā¦
WEBIn the light of the current scanty knowledge of their origin and early evolutionary history, and our inadequate understanding of the higher-level phylogenetic relationships of the Coleoidea, any Carboniferous shell, which might have belonged to a coleoid cephalopod, is of exceptional interest.
The gladiuses in coleoid cephalopods: homology, parallelism, or ...
WEB25 sep. 2015 · In the cephalopod subclass Coleoidea, several homology problems exist, mainly owing to unsolved phylogenetic relationships between decabrachian orders. The present contribution reviews the āsimilarityā of the gladius, the chitinous shell rudiment in the dorsal mantle that provides rigid attachment sites for the locomotory ...
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