Hybrids of two closely related tropical sea urchins (genus Echinometra): evidence against postzygotic isolating mechanisms.

@article{Rahman2001HybridsOT,
  title={Hybrids of two closely related tropical sea urchins (genus Echinometra): evidence against postzygotic isolating mechanisms.},
  author={M. Azizur Rahman and Tsuyoshi Uehara and John S. Pearse},
  journal={The Biological bulletin},
  year={2001},
  volume={200 2},
  pages={97-106}
}
A series of cross-fertilization experiments were conducted with two unnamed, sympatric species of sea urchins in the Echinometra mathaei species complex, Echinometra sp. A (Ea) and Echinometra sp. C (Ec). Heterogametic fertilization success was high when eggs of Ec and sperm of Ea were involved, and low with eggs of Ea and sperm of Ec. Hybrids produced from crosses in either direction developed normally to sexually mature adults; Ea x Ea were largest in test size, followed by Ec (ova) x Ea… CONTINUE READING
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