Morphology (biology)

Morphology of a male Caprella mutica

Morphology is a branch of biology dealing with the study of the form and structure of organisms and their specific structural features.^[1]

This includes aspects of the outward appearance (shape, structure, colour, pattern, size), i.e. external morphology (or eidonomy), as well as the form and structure of the internal parts like bones and organs, i.e. internal morphology (or anatomy). This is in contrast to physiology, which deals primarily with function. Morphology is a branch of life science dealing with the study of gross structure of an organism or taxon and its component parts.

Morphology

The word "morphology" is from the Ancient Greek don, morphé, meaning "form", and λόγος, lógos, meaning "word, study, research". The biological concept of morphology was developed by Johann Wolfgang von Goethe (1790) and independently by the German anatomist and physiologist Karl Friedrich Burdach (1800).^[2]

Among other important theorists of morphology are Lorenz Oken, Georges Cuvier, Étienne Geoffroy Saint-Hilaire, Richard Owen, Karl Gegenbaur and Ernst Haeckel.^[3][4]

In English-speaking countries, the term "molecular morphology" has been used for some time for describing the structure of compound molecules, such as polymers ^[5] and RNA. The term "gross morphology" refers to the collective structures or an organism as a whole as a general description of the form and structure of an organism, taking into account all of its structures without specifying an individual structure.

Divisions of morphology

• Comparative Morphology is analysis of the patterns of the locus of structures within the body plan of an organism, and forms the basis of taxonomical categorization.
• Functional Morphology is the study of the relationship between the structure and function of morphological features.
• Experimental Morphology is the study of the effects of external factors upon the morphology of organisms under experimental conditions, such as the effect of genetic mutation.
• "Anatomy" is a "branch of morphology that deals with the structure of organisms".^[6]

Morphology and classification

Most taxa differ morphologically from other taxa. Typically, closely related taxa differ much less than more distantly related ones, but there are exceptions to this. Cryptic species are species which look very similar, or perhaps even outwardly identical, but are reproductively isolated. Conversely, sometimes unrelated taxa acquire a similar appearance as a result of convergent evolution or even mimicry. In addition, there can be morphological differences within a species, such as in Apoica flavissima where queens are significantly smaller than workers. A further problem with relying on morphological data is that what may appear, morphologically speaking, to be two distinct species, may in fact be shown by DNA analysis to be a single species. The significance of these differences can be examined through the use of allometric engineering in which one or both species are manipulated to phenocopy the other species.

3D cell morphology:classification

Invention and development of microscopy enable the observation of 3-D cell morphology with both high spatial and temporal resolution. The dynamic processes of these cell morphology which are controlled by a complex system play an important role in varied important biological process, such as immune and invasive responses.^{[7] [8]}

See also

• Comparative anatomy
• Insect morphology
• Morphometrics
• Neuromorphology
• Phenetics
• Phenotype
• Phenotypic plasticity
• Plant morphology

References

Anatomy and morphology
Fields	Gross anatomy Superficial anatomy Neuroanatomy Comparative anatomy Transcendental anatomy Microscopic anatomy histology molecular
Bacteria	Bacterial cell structure
Protists	Level of organization Structures
Plants	Plant anatomy Plant habit Plant life-form/growth-form/physiognomy Plant morphology Fruit anatomy
Invertebrates	Body plan Decapod anatomy Gastropod anatomy Insect morphology Spider anatomy
Mammals	Human anatomy Neanderthal anatomy Cat anatomy Dog anatomy Horse anatomy Elephant anatomy Giraffe anatomy
Other vertebrates	Bird anatomy Fish anatomy Shark anatomy
Other topics	Allometry Brain morphometry Morphometrics Physiognomy