aplacophoran sentence in Hindi
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- The aplacophorans are traditionally considered ancestral to the other mollusc classes.
- The affinities of Aplacophorans have long been uncertain.
- Molecular and fossil evidence seemed to put Aplacophorans in the clade Aculifera, as a sister group to Polyplacophora.
- However, the relationship between the two aplacophoran groups and to the other molluscan classes and to each other is as yet unclear.
- Aplacophorans are cylindrical and worm-like in form, and most very small, being no longer than; some species, however, can reach a length of.
- The discovery of " Kulindroplax " in 2012, a fossil aplacophoran with a polyplacophoran-like armour, strongly supports this hypothesis, and shows that aplacophorans evolved from progenitors that bore valves.
- The discovery of " Kulindroplax " in 2012, a fossil aplacophoran with a polyplacophoran-like armour, strongly supports this hypothesis, and shows that aplacophorans evolved from progenitors that bore valves.
- The relationship with other molluscs, however, is apparent from some features of the digestive system; aplacophorans possess both a radula and a hermaphroditic, but caudofoveates have two sexes, and reproduce by external fertilization.
- His research focused on molluscs and more specifically on the ectoparasitic pyramidellid gastropods and the, shell-less, primary deep-sea aplacophorans, the biogeography of these animals, and the relationship between the molluscs and other animal groups.
- While other fossil taxa like " Acaenoplax " and " Phthipodochiton " showed intermediate features between aplacophorans and polyplacophorans, no unambiguous fossil with an aplacophoran-like body and a polyplacophoran-like shell has been found before " Kulindroplax ".
- While other fossil taxa like " Acaenoplax " and " Phthipodochiton " showed intermediate features between aplacophorans and polyplacophorans, no unambiguous fossil with an aplacophoran-like body and a polyplacophoran-like shell has been found before " Kulindroplax ".
- Marine biologist Am�lie H . Scheltema " et al . " ( 2003 ) argued that " Wiwaxia " s feeding apparatus was very similar to the radulas of some modern shell-less aplacophoran molluscs, and that the sclerites of the two groups are very similar.
- Marine biologist Am�lie H . Scheltema " et al . " ( 2003 ) argued that " Wiwaxia " s feeding apparatus is very similar to the radulas of some modern shell-less aplacophoran molluscs, and that the sclerites of the two groups are very similar.
- The shell-less aplacophora have a chitinous cuticle that has been likened to the shell framework; it has been suggested that tanning of this cuticle, in conjunction with the expression of additional proteins, could have set the evolutionary stage for the secretion of a calcareous shell in an aplacophoran-like ancestral mollusc.
- They argued that : " Halkieria " s sclerites resembled those of the modern solenogaster aplacophoran shell-less molluscs ( see ), of some modern polyplacophoran molluscs, which have several shell plates, and of the Ordovician polyplacophoran " Echinochiton "; " Halkieria " s shells are more similar to the shells of conchiferan molluscs, since shells of both of these groups show no trace of the canals and pores seen in polyplacophoran shell plates; the bristles of brachiopods and annelids are similar to each other but not to " Halkieria " s sclerites.
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