Enclosure and maintenance
Adults reach about 14–16 cm (5.5–6.25 in). Aphonopelma seemanni is a terrestrial species, so the enclosure should prioritise usable floor space, a snug ground-level retreat and enough substrate to keep fall height low.
With Aphonopelma seemanni, routine care should not involve handling. Arrange the water dish, retreat and door so feeding and cleaning can be done without repeatedly disturbing the spider.
Growth, feeding and moulting
Growth is slow. Feed to the spider's size, appetite and abdomen rather than forcing a rigid weekly schedule; the routine will change as Aphonopelma seemanni grows.
If Aphonopelma seemanni refuses food and shows premoult signs, remove live prey, keep water available and leave it alone. There is no need to make a spider in normal premoult eat.
Lifespan and buying one
Costa Rican Zebra females often live 15–20 years; males live roughly 4–6 years. For a female, that can be a decades-long commitment.
A sexed Costa Rican Zebra label is only as useful as the evidence behind it. Ask how the sex was confirmed and get a measured size rather than relying on juvenile or sub-adult.