My guess would have been sapele or utile (more towards the latter) based solely on the colour and the grain pattern. Why are you sure it's not sapele? Sapele doesn't always have the big ribbon-y interlocks that we associate with it, and there's a certainly a degree of interlock there, looking at the left board. When was it cut / planed? It could be khaya or honduran if it's had a while to oxidize. Looks too dense and dark to be Spanish Cedar at first glance. Did it smell when it was worked? (both sapele and utile do, but sapele's typically a fair bit more noticeable).
You can hazard a pretty decent guess if you're familiar with them. We get quite a lot of the african mahog-alikes over here, less so the the caribbean stuff (most of that comes from old tables and doors). Unfortunately, two of the main giveaways are smell and mass, which you can't really do over the internet. Sapele and Utile you can often tell apart from Khaya and Honduran just on mass and grain density alone; you get used to how they're 'supposed' to feel, although the variance within species can throw you off. Khaya and Honduran can be very difficult to split -- you often have to break out a loupe and start looking at the parenchyma. Spanish cedar's usually noticeably lighter, both in colour and weight.