Search results
Results from the WOW.Com Content Network
The yellow mask is a plesiomorphy for each living masked species, because it is ancestral. [2] It is also a symplesiomorphy for them. But for the four living species as a whole, it is an apomorphy because it is not ancestral for all of them. The yellow tail is a plesiomorphy and symplesiomorphy for all living species.
The images of the living OTUs (29 species) were made available in the early 1960s; those of the fossil ones (48 species) later in the decade. These images were copied using xerography . Copies of all OTUs were in the possession of Dr. Paul A. Ehrlich ( Stanford University ), Dr. W. Wayne Moss (Philadelphia Academy of Sciences) and Robert R ...
The Encyclopedia of Life (EOL) is a free, online encyclopedia intended to document all of the 1.9 million living species known to science. It aggregates content to form "pages" for every known species. Content is compiled from existing trusted databases which are curated by experts and it calls on the assistance of non-experts throughout the world.
[3] [4] In the three-domain model, the first two are prokaryotes, single-celled microorganisms without a membrane-bound nucleus. All organisms that have a cell nucleus and other membrane-bound organelles are included in Eukarya and called eukaryotes. Non-cellular life, most notably the viruses, is not included in this system.
The typical dental formula is: 3.1.4.2 3.1.4.2, but the number may be reduced, although never to the same extent as in the Felidae. [4] Their flesh-shearing carnassial teeth are relatively undeveloped compared to those of other feliform carnivorans. [6] Most viverrid species have a penis bone (a baculum). [7]
There are just two living species of colugos: the Sunda flying lemur (Galeopterus variegatus) and the Philippine flying lemur (Cynocephalus volans). These two species make up the entire family Cynocephalidae ( / ˌ s aɪ n oʊ ˌ s ɛ f ə ˈ l aɪ d i , - ˌ k ɛ -/ ) [ 5 ] and order Dermoptera [ 1 ] [ 6 ] (from Ancient Greek δέρμα ...
The broad-snouted and spectacled caimans are characterised by having a bony ridge across the bridge of the nose just below the eyes. [4] The yacare caiman is the largest species in the genus, attaining an average adult length of 2.5 to 3 m (8.2 to 9.8 ft), [5] the spectacled caiman reaches 2 to 2.5 m (6.6 to 8.2 ft), with the female rather ...
Molluscs are second only to arthropods in numbers of living animal species [20] —far behind the arthropods' 1,113,000 but well ahead of chordates' 52,000. [18]: Front endpaper About 200,000 living species in total are estimated, [ 3 ] [ 24 ] and 70,000 fossil species, [ 17 ] although the total number of mollusc species ever to have existed ...