These are the plate-like swimmerets and opercula of Gigantostraca and Limulus among Arachnids and of Isopod Crustaceans.
The first of these has, in Arachnids as in other Arthropods, its pair of appendages represented by the eyes.
The Epectinate Arachnids do not stand so close to the aquatic ancestors of the Embolobranchia as do the Pectiniferous scorpions.
These most strange-looking Arachnids occur in warmer temperate, and tropical regions of Asia, Africa and America.
The second has for its pair of appendages the small pair of limbs which in all living Arachnids is either chelate or retrovert (as in spiders), and is known as the chelicerae.
The nomomeristic Arachnids comprise two sub-classes--one a very small degenerate offshoot from early ancestors; the other, the great bulk of the class.
Applying these principles to the consideration of the Arachnida, we arrive at the conclusion that the smaller and simpler Arachnids are not the more primitive, but that the Acari or mites are, in fact, a degenerate group.
Any one of numerous species of arachnids comprising the order Araneina.
Any one of numerous species of pulmonate arachnids of the order scorpiones, having a suctorial mouth, large claw-bearing palpi, and a caudal sting.
Naturally, therefore, we compare the arachnids with the Crustacea rather than with the Insecta.
The term Arachnida is used for all arachnids other than Merostomata, merely as a convenient inclusive name for the groups not especially studied.
Defn: Any one of various other arachnidsresembling the true spiders, especially certain mites, as the red spider (see under Red).
Defn: A division of arachnids comprising the scorpions.
Defn: Any one of numerous species of pulmonate arachnids of the order scorpiones, having a suctorial mouth, large claw-bearing palpi, and a caudal sting.
Any one of numerous species of pulmonate arachnids of the order Scorpiones, having a suctorial mouth, large claw-bearing palpi, and a caudal sting.
Turning now to the consideration of the lateral eyes, we see that these eyes in the arachnids often possess an inverted retina, in the crustaceans always an upright retina.
This observation of Gaubert suggests that the place of the lyriform organs in other arachnids is taken in Galeodes by the racquet-organs, and in the scorpions by the pectens.
We may then take it for granted that arachnids as well as insects hear.
The universality of such diverticula among the arachnids makes it highly probable that their progenitors did possess an alimentary canal with one or more pairs of anterior diverticula.
Further, not only the retina but also the dioptric apparatus of the vertebrate eye point to its origin from a type that combined the peculiarities of the arachnids and the crustaceans.
The Myriapoda are the centipedes and millipedes, and having said this we may dismiss them, for insects and arachnids are strictly limited as to legs; and no myriapod can ever be mistaken for a spider.
They may be distinguished from all other Arachnids by the fact that the distinctly segmented abdomen is divided into a broad basal region of seven segments and a terminal, slender, tail-like division of five distinct segments.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "arachnids" in a variety of sentences. We hope that you will now be able to make sentences using this word.
