The "Corvida" were one of two "
parvorder
Order () is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between family and class. In biological classification, the order is a taxonomic rank used in the classification of organisms and recognized ...
s" contained within the suborder
Passeri
A songbird is a bird belonging to the suborder Passeri of the perching birds (Passeriformes). Another name that is sometimes seen as the scientific or vernacular name is Oscines, from Latin ''oscen'', "songbird". The Passeriformes contains 5,00 ...
, as proposed in the
Sibley-Ahlquist taxonomy, the other being
Passerida. Standard
taxonomic practice would place them at the rank of
infraorder
Order () is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between Family_(biology), family and Class_(biology), class. In biological classification, the order is a taxonomic rank used in the classific ...
.
More recent research suggests that this is not a distinct
clade
In biology, a clade (), also known as a Monophyly, monophyletic group or natural group, is a group of organisms that is composed of a common ancestor and all of its descendants. Clades are the fundamental unit of cladistics, a modern approach t ...
—a group of closest relatives and nothing else—but an
evolutionary grade
A grade is a taxon united by a level of morphological or physiological complexity. The term was coined by British biologist Julian Huxley, to contrast with clade, a strictly phylogenetic unit.
Phylogenetics
The concept of evolutionary grades ...
instead. As such, it is abandoned in modern treatments, being replaced by a number of
superfamilies that are considered rather
basal among the Passeri.
It was presumed that
cooperative breeding
Cooperative breeding is a social system characterized by alloparental care: offspring receive care not only from their parents, but also from additional group members, often called helpers. Cooperative breeding encompasses a wide variety of group s ...
—present in many or most members of the
Maluridae
The Australasian wrens are a family, Maluridae, of small, insectivorous passerine birds endemic to Australia and New Guinea. While commonly known as wrens, they are unrelated to the true wrens. The family comprises 32 species (including sixteen ...
,
Meliphagidae
The honeyeaters are a large and diverse family (biology), family, Meliphagidae, of small to medium-sized birds. The family includes the Epthianura, Australian chats, myzomelas, friarbirds, wattlebirds, Manorina, miners and melidectes. They are m ...
,
Artamidae
Artamidae is a family of passerine birds found in Australia, the Indo-Pacific region, and Southern Asia. It includes 24 extant species in six genera and three subfamilies: Peltopsinae (with one genus, '' Peltops''), Artaminae (with one genus con ...
and
Corvidae
Corvidae is a Cosmopolitan distribution, cosmopolitan Family (biology), family of Songbird, oscine passerine birds that contains the crows, ravens, Rook (bird), rooks, magpies, jackdaws, jays, treepies, choughs, and Nutcracker (bird), nutcrackers ...
, among others—is a common
apomorph
In phylogenetics, an apomorphy (or derived trait) is a novel character or character state that has evolved from its ancestral form (or plesiomorphy). A synapomorphy is an apomorphy shared by two or more taxa and is therefore hypothesized to ha ...
y of this group. But as evidenced by the updated
phylogeny
A phylogenetic tree or phylogeny is a graphical representation which shows the evolutionary history between a set of species or Taxon, taxa during a specific time.Felsenstein J. (2004). ''Inferring Phylogenies'' Sinauer Associates: Sunderland, M ...
, this trait is rather the result of
parallel evolution
Parallel evolution is the similar development of a trait in distinct species that are not closely related, but share a similar original trait in response to similar evolutionary pressure.Zhang, J. and Kumar, S. 1997Detection of convergent and pa ...
, perhaps because the early Passeri had to compete against many ecologically similar birds (see
near passerine).
Placement of "Corvida" families
This table lists, in taxonomic order, the families placed in "Corvida" by the Sibley-Ahlquist taxonomy in the left column. The right column contains details of their placement in modern systematics.
Corvoidea and
Meliphagoidea are placed basally among the Passeri too. They are, however, groups large enough to be considered superfamilies in their own right.
In addition, the following families were not included in the "Corvida" although their closest relationships are with taxa included therein:
Footnotes
References
* (1996): Why do so many Australian birds cooperate? Social evolution in the Corvida. ''In:'' : ''Frontiers in Population Ecology'': 21–42. CSIRO, Melbourne.
{{Taxonbar, from=Q869223
Obsolete bird taxa
Paraphyletic groups