Portal:Animals

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embryonic development. Animals form a clade
, meaning that they arose from a single common ancestor.

Over 1.5 million

ecologies and interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology, and the study of animal behaviors is known as ethology
.

Most living animal species belong to the infrakingdom

molluscs, flatworms, annelids and nematodes; and the deuterostomes, which include the echinoderms, hemichordates and chordates, the latter of which contains the vertebrates. The simple Xenacoelomorpha have an uncertain position within Bilateria. (Full article...
)

classification, habits, and distribution of all animals, both living and extinct, and how they interact with their ecosystems. Zoology is one of the primary branches of biology. The term is derived from Ancient Greek ζῷον, zōion ('animal'), and λόγος, logos ('knowledge', 'study'). (Full article...
)

Selected pictures


Portrait of Linnaeus

  • ...that
    biologically immortal
    ?
  • ...that
    Carolus Linnaeus
    '
    (portrait pictured) research on classification led to objections and rebukes from religious authorities?
  • ...that Lampreys are called "nine-eyed eels" (i.e., per side) from a counting of their seven external gill slits on a side with one eye and the nostril?


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The following table lists estimated numbers of described extant species for the animal groups with the largest numbers of species,[1] along with their principal habitats (terrestrial, fresh water,[2] and marine),[3] and free-living or parasitic ways of life.[4] Species estimates shown here are based on numbers described scientifically; much larger estimates have been calculated based on various means of prediction, and these can vary wildly. For instance, around 25,000–27,000 species of nematodes have been described, while published estimates of the total number of nematode species include 10,000–20,000; 500,000; 10 million; and 100 million.[5] Using patterns within the taxonomic hierarchy, the total number of animal species—including those not yet described—was calculated to be about 7.77 million in 2011.[6][7][a]

Phylum Example No. of
Species
Land
Sea
Fresh
water
Free-
living
Parasitic
Annelids 17,000[1] Yes (soil)[3] Yes[3] 1,750[2] Yes 400[4]
Arthropods
wasp 1,257,000[1] 1,000,000
(insects)[9]
>40,000
(Malac-
ostraca)[10]
94,000[2] Yes[3] >45,000[b][4]
Bryozoa 6,000[1] Yes[3] 60–80[2] Yes
Chordates
green spotted frog facing right 65,000[1]
45,000[11]

23,000[11]

13,000[11]
18,000[2]
9,000[11]
Yes 40
(catfish)[12][4]
Cnidaria Table coral 16,000[1] Yes[3] Yes (few)[3] Yes[3] >1,350
(Myxozoa)[4]
Echinoderms
7,500[1] 7,500[1] Yes[3]
Molluscs
snail 85,000[1]
107,000[13]

35,000[13]

60,000[13]
5,000[2]
12,000[13]
Yes[3] >5,600[4]
Nematodes
25,000[1] Yes (soil)[3] 4,000[5] 2,000[2] 11,000[5] 14,000[5]
Platyhelminthes
29,500[1] Yes[14] Yes[3] 1,300[2] Yes[3]

3,000–6,500[15]

>40,000[4]

4,000–25,000[15]

Rotifers 2,000[1] >400[16] 2,000[2] Yes
Sponges
10,800[1] Yes[3] 200-300[2] Yes Yes[17]
Total number of described extant species as of 2013: 1,525,728[1]

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References

  1. ^ The application of DNA barcoding to taxonomy further complicates this; a 2016 barcoding analysis estimated a total count of nearly 100,000 insect species for Canada alone, and extrapolated that the global insect fauna must be in excess of 10 million species, of which nearly 2 million are in a single fly family known as gall midges (Cecidomyiidae).[8]
  2. ^ Not including parasitoids.[4]