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. 2019 Apr 19;9(9):5468–5478. doi: 10.1002/ece3.5142

Figure 2.

Figure 2

Lateral view of a tentative morphological gradient from Chromis fieldi (top) to C. margaritifer (bottom). The specimens, from top to bottom, are: C. fieldi (Mauritius, FishBase reference picture by J.E. Randall); XCD02 and XCD01 visually ID as C. fieldi; two putative hybrids (HYBRIDCHROMIS and COVEXCMDHY02); C. margaritifer (XCM22, Christmas Island, credit to J.P. Hobbs); and C. margaritifer (Marshall Islands, FishBase reference picture by J.E. Randall). The visual discrimination between purebred and hybrid specimens is mainly based on coloration (light yellowish vs. whiter caudal fin; and black vs. dark brown posterior body) and the position of the split/border line between light and dark colored body sections (rather “half and half” for C. fieldi vs. more restricted to the caudal fin only in C. margaritifer)