Faunal Diversity of India - SpringerLink The phylum Arthropoda is remarkable in having the largest number of classes, orders, families, genera and species in India Arachnida is one of the major classes of the phylum with 5953 species, being nearly 5 29% of those in the world fauna Crustacea, another major class, is known by 3835 species, being over 5 66% of those in the world fauna
A genomic timescale for placental mammal evolution | Science Coalescent and concatenation phylogenies inferred from multiple treatments of the data were highly congruent, including support for higher-level taxonomic groupings that unite primates+colugos with treeshrews (Euarchonta), bats+cetartiodactyls+perissodactyls+carnivorans+pangolins (Scrotifera), all scrotiferans excluding bats (Fereuungulata), and carnivorans+pangolins with perissodactyls
The evolution of mammal body sizes: responses to Cenozoic . . . The maximum body sizes of herbivorous lineages increased during the Paleocene and early Eocene and attained a maximum size three orders of magnitude larger than late Cretaceous mammals by the middle Eocene (Alroy, 1998; Smith Lyons, 2011) Over the remainder of the Cenozoic, maximum body sizes tended to remain stable (Smith Lyons, 2011)
Therapsida - Wikipedia Therapsida [a] is a clade comprising a major group of eupelycosaurian synapsids that includes mammals and their ancestors and close relatives Many of the traits today seen as unique to mammals had their origin within early therapsids, including limbs that were oriented more underneath the body, resulting in a more "standing" quadrupedal posture, as opposed to the lower sprawling posture of
Is a shark a fish or a mammal? - Save Our Seas Foundation Anatomy While sharks have been around for more than 400 million years, mammals only appeared about 178 million years ago Like sharks, mammals diversified into many forms and species, but while the two have similar structures that help them thrive in the oceans, they are entirely different animals