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5 results for “Troglomorphic features”
Figure 5 from: Espinasa L, Robinson J, Soares D, Hoese G, Toulkeridis T, Toomey III R (2018) Troglomorphic features of Astroblepus pholeter, a cavefish from Ecuador, and possible introgressive hybridization. Subterranean Biology 27: 17-29. https://doi.org/10.3897/subtbiol.27.27098
Figure 5 Specimens collected in 1962 (A modified from Collette 1962) and 2011 (B Modified from Soares and Niemiller 2013) had proportionally longer pectoral fins and maxillary barbels than specimens observed in the field in 2015 (C). Images have been scaled to the same body size (blue arrow). Notice that length of appendages in C–D (red arrows) are progressively smaller than in B and A (red plus yellow and green arrows).
Figure 1 from: Espinasa L, Robinson J, Soares D, Hoese G, Toulkeridis T, Toomey III R (2018) Troglomorphic features of Astroblepus pholeter, a cavefish from Ecuador, and possible introgressive hybridization. Subterranean Biology 27: 17-29. https://doi.org/10.3897/subtbiol.27.27098
Figure 1 Specimens collected in 1962 (holotype, and paratypes of A.pholeter from left to right) 2011, 2015 and 2018. Notice that there is a progressive reduction in the expression of troglomorphic features. After 2011 the skin was distinctly more pigmented and the barbels and fins were shorter. Eyes are also embedded under a thinner dermal layer of skin. In 2011 the population was highly variable.
Figure 3 from: Espinasa L, Robinson J, Soares D, Hoese G, Toulkeridis T, Toomey III R (2018) Troglomorphic features of Astroblepus pholeter, a cavefish from Ecuador, and possible introgressive hybridization. Subterranean Biology 27: 17-29. https://doi.org/10.3897/subtbiol.27.27098
Figure 3 AChaetostomamicrops (Surface catfish) BAstroblepuspholeter (Cave catfish). Both species inhabit the same river drainage.
Figure 4 from: Espinasa L, Robinson J, Soares D, Hoese G, Toulkeridis T, Toomey III R (2018) Troglomorphic features of Astroblepus pholeter, a cavefish from Ecuador, and possible introgressive hybridization. Subterranean Biology 27: 17-29. https://doi.org/10.3897/subtbiol.27.27098
Figure 4 Cross section of the eye from Astroblepuspholeter (A, E–G) and Chaetostomamicrops (B–D). Notice that the pigmented epithelium (G) and iris of A.pholeter (E) are black, implying that they are not albino. Furthermore, A.pholeter eye has retained its lens, optic nerve, and its retina has all the normal layers, as the surface fish eye.
Figure 2 from: Espinasa L, Robinson J, Soares D, Hoese G, Toulkeridis T, Toomey III R (2018) Troglomorphic features of Astroblepus pholeter, a cavefish from Ecuador, and possible introgressive hybridization. Subterranean Biology 27: 17-29. https://doi.org/10.3897/subtbiol.27.27098
Figure 2 A–C Live specimens of cave AstroblepuspholeterD Two different surface Astroblepus sp. from the Apurimac drainage. Notice contrasting coloration between A and B both of which were collected in 2011. Pigmentation level variability within the cave population in 2011 spanned from pinkish-white white (A) to pigmented (B) at levels equivalent to some surface Astroblepus (D). Specimens collected in 2011 had longer fins (A) than those collected in 2015 (C). Notice as well that some surface Astroblepus (bottom one in D) can have small eyes of a size equivalent to cave specimens. A Modified from Haspel et al. (2012)B Modified from the Soares Lab web-page-photo C Specimen collected on 2015 D Modified from Schaefer et al. (2011).
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