Chalcinotrematinae - Seeking Ground Truth
Ground truth is a term used in cartography, meteorology, analysis of aerial photographs, satellite imagery and a range of other
remote sensing techniques in which data are gathered at a distance. The collection of ground-truth data enables calibration of remote-sensing systems, and aids in the interpretation
and analysis of what is being sensed.
More specifically, ground truth may refer to a process in which a data point from a sensory system is compared to what is contained in the source
(at the present time) in order to verify the nature and identity of the source, thereby validating the methodology. In the molecular analysis of parasite DNA, extracted from nuclear
protein, this comparison both groups the sampled organism with others related, and displays degrees of separation from other similar appearing
organisms. The sensing technique of molecular analysis, correctly performed and interpreted, establishes "ground truth" for species identity.
Chalcinotrematinae - Characters of the Subfamily
Vitelline follicles surround the testis
The prepharynx is short
Anterior extent of the uterus is anterior to the ventral sucker
Miracidia in uterine eggs contain pigmented eyespots (at least in some species)
Chalcinotrematine species have a close ecological relationship with fishes of the Characiformes. A very large group, these fishes are primarily
South American in distribution, extending North through Central America and Mexico into the region just South of the Rio Bravo (Rio Grande).
Collections from these regions made in recent years by scientists from GCRL are redefining taxanomic relationships among these little-known parasitic organisms.
The Gulf Coast Research Laboratory (GCRL) is located at the nexus of three huge reservoirs of
biological research material. The gradients of biodiversity provided by the freshwater wilderness watershed of the Pascagoula
River, the unique and well-documented Pearl River system on the West, and their junctions with the Gulf of Mexico provide
research opportunities in abundance. Not limited by local material, GCRL is actively collecting Haploporoidean trematodes
in all global environments. A Parasitological Molecular Laboratory, a superb facility set aside for
DNA analysis of the fresh material constantly arriving, is enabling insightful discoveries in the evolution and zoogeography of
Change Date 13 November 2011
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