Comparative anatomy

British biologist and comparative anatomist (1825–1895)

study of external forms and structures of organisms

study of similarities and differences in the anatomy of different species

set of morphological features common to members of a clade of animals

thumb|360px|right|Size of genera in the extinct bird family Confuciusornithidae, compared to a human (1.75 meter tall). A. [[Changchengornis. Based on the holotype. B. Confuciusornis. Based on several specimens of about the same size. C. Eoconfuciusornis. Based on the holotype IVPP V11977.]] thumb|Measuring shell length in bog turtles.

alt=Human hand anatomy|thumb|Human hand anatomy (pentadactyl) In biology, dactyly is the arrangement of digits (fingers and toes) on the hands, feet, or sometimes wings of a tetrapod animal. The term is derived from the Ancient Greek word δάκτυλος (dáktulos), meaning "finger."

Ecomorphology or ecological morphology is the study of the relationship between the ecological role of an individual and its morphological adaptations. The term "morphological" here is in the anatomical context. Both the morphology and ecology exhibited by an organism are directly or indirectly influenced by their environment, and ecomorphology aims to identify the differences. Current research places emphasis on linking morphology and ecological niche by measuring the performance of traits (i.e. sprint speed, bite force, etc.) associated behaviours, and fitness outcomes of the relationships.

thumb|right|Female velvet ants are an example of secondary aptery, as they belong to a taxon of winged insects, the superfamily [[Vespoidea. Furthermore, male velvet ants are fully winged.]] Aptery is the anatomical condition of an animal completely lacking any kind of wings. An animal with this condition is said to be apterous.

Scottish anatomist

paired exocrine gland in many hoofed animals

facet of Lepidoptera