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24 Cards in this Set
- Front
- Back
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Systematics |
Phylogenetic relationships based on the characteristics of a given group of species |
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Meristic |
Characteristics that are not metameric and are relatively stable and more or less independent of body size (ex. scales, lateral line pores) |
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Morphometric |
Measurable features of the topography of fish (head length, eye length, distance between orbits, body depth, length of fins) |
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Allometric growth |
Features may change with increasing size of the individual |
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Truss diagram |
A diagram used to make morphometric measurements |
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Holotype |
Single specimen on which the species description was based |
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Paratype |
Additional specimen used in the species description |
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PhyloCode |
New nomenclature system proposed based on phylogenetic relationships |
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Triploblastic |
Possessing 3 embryonic tissue sources (ectoderm, mesoderm, endoderm) |
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Coelom |
Internal body cavity |
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Eucoelomates |
Organisms in which the cavity arose entirely within the mesoderm |
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Protostomes |
Organisms in which the blastopore occurs near what will become the mouth of the animal |
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Blastopore |
Early invagination in a ball of embryonic cells that ultimately contributes to the establishment of the triploblastic condition |
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Deuterostomes |
Organisms in which the blastopore forms in the vicinity of the anus |
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Carpoids |
A.K.A calcichordates, stylophorans, or mitrates Fossil deuterostomes that have affinities for both echinoderms and chordates such as pharyngeal gill slits |
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Deuterostome phyla |
Echinodermata Hemichordata Chordata (includes subphylum Vertebrata) |
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Phylum Chordata |
Urochordata (tunicates) Cephalochordata (lancelets, or amphioxus) Vertebrata (vertebrates) |
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Pharyngotremy |
Perforations in the pharynx |
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Paedomorphosis |
Process in which the adult stage is progressively delayed |
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Metamerism |
The serial repetition of both internal and external features |
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Homeobox, homeotic, or hox genes |
A few select gene families that are common to several otherwise apparently unrelated lineages |
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Chordin |
Gene in vertebrates responsible for patterning dorsal structures |
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Sog |
Gene in insects responsible for ventral determination |
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Homeostasis |
The active regulation of a state of internal stability in the face of potential change in the external realm |
