Early cephalopod evolution clarified through Bayesian phylogenetic inference. [PDF]
BMC Biol, 2022 Background: Despite the excellent fossil record of cephalopods, their early evolution is poorly understood. Different, partly incompatible phylogenetic hypotheses have been proposed in the past, which reflected individual author's opinions on the ...
Pohle A +8 more
europepmc +5 more sources
The cuttlefish Sepia officinalis (Sepiidae, Cephalopoda) constructs cuttlebone from a liquid-crystal precursor. [PDF]
Sci Rep, 2015 Cuttlebone, the sophisticated buoyancy device of cuttlefish, is made of extensive superposed chambers that have a complex internal arrangement of calcified pillars and organic membranes. It has not been clear how this structure is assembled. We find that
Checa AG +4 more
europepmc +7 more sources
Enigmatic dual symbiosis in the excretory organ of Nautilus macromphalus (Cephalopoda: Nautiloidea). [PDF]
Proc Biol Sci, 2007 Symbiosis is an important driving force in metazoan evolution and the study of ancient lineages can provide an insight into the influence of symbiotic associations on morphological and physiological adaptations. In the ‘living fossil’ Nautilus , bacterial associations are found in the highly specialized pericardial ...
Pernice M +4 more
europepmc +6 more sources
Nautílidos liásicos de los alrededores de Alfara (Tarragona, NE España) [PDF]
, 1988 Se describen algunos ejemplares de 5 formas distintas de nautilidos, pertenecientes al género Cenoceras, procedentes de Alfara y sus alrededores (Prov. Tarragona). Dos de las especies (C. ornatum atanatense y C.
Calzada Badía, Sebastián
core +6 more sources
Discriminating faunal assemblages and their palaeoecology based on museum collections : the Carboniferous Hurlet and Index limestones of western Scotland [PDF]
, 2010 Historical collections of Scottish Carboniferous macrofossils stored at the British Geological Survey (BGS), Edinburgh include the sole remaining sources of palaeontological data from numerous localities.
Akhurst, M.C. +3 more
core +2 more sources
Conellae, enigmatic structures on cephalopod shells—shapes, distribution, and formation [PDF]
, 2019 Conellae, enigmatic cone-shaped structures which can be found on the surface of internal moulds of cephalopod shells (predominantly of ammonoids), are regarded herein as the product of remote (biologically induced) biomineralization formed in closed-off ...
Hoffmann, René +2 more
core +1 more source
Siphuncular structure in the orders Tarphycerida and Barrandeocerida (Cephalopoda: Nautiloidea) [PDF]
Palaeontology, 2011 Abstract: The siphuncular structure is described in two Silurian taxa, Boionautilus tyrannus and Cumingsoceras complanatus, currently placed in the Tarpycerida. Tarphycerids have the Nautilus type of connecting ring that is composed of an outer, thick, spherulitic‐prismatic layer and an inner glycoprotein layer, the latter was destroyed by diagenesis.
HARRY MUTVEI, ELENA DUNCA
openaire +1 more source
, 2017 Within the Phylum Mollusca, cephalopods encompass a small and complex group of exclusively marine animals that live in all the oceans of the world with the exception of the Black and Caspian seas.
DI COSMO, Anna, Polese, Gianluca
core +1 more source
Early Tremadocian cephalopods from Santa Rosita Formation in NW Argentina: the oldest record for South America [PDF]
, 2023 We describe early Tremadocian (Kainella meridionalis Biozone) cephalopods from the Cordillera Oriental, Jujuy, NW Argentina. They consist of numerous small specimens collected at the Quebrada de Arenal, Trancas section, near the town of Tilcara, in the ...
Cichowolski, Marcela +5 more
core +3 more sources
O enigma da "reação espermatofórica": breve síntese do conhecimento sobre a estrutura e o funcionamento dos espermatóforos dos cefalópodes (Mollusca: Cephalopoda) [PDF]
, 2011 Cefalópodes coleóides (lulas, sépias e polvos) produzem espermatóforos muito complexos que são transferidos à fêmea durante a cópula por meio do hectocótilo, um apêndice modificado nos machos.
MARIAN, José Eduardo Amoroso Rodriguez
core +3 more sources