At least that's what I think it is. Leveling-off of growth probably discounts juvenile Atya, definitely not Micratya poeyi or Typhlatya monae, and habitat and morphology aren't really consistent with descriptions of Jonga serrei.
Collected in Río Espiritu Santo, Puerto Rico over a year ago, amidst overhanging leafy vegetation along a rocky stream bank. Place of origin would narrow it down to either Potimirim americana, Potimirim glabra, or Potimirim mexicana. Now shares a 10-gallon tank with juvenile red cherries, Melanoides tuberculata, and Tarebia granifera (all descendants of a single specimen from Puerto Rico). At the time of its capture, the shrimp was only a few millimeters long, but it's now a little over a centimeter. The white longitudinal stripe developed as the initially translucent juvenile aged.
Filter-feeding behavior is occasionally observed (fan appendages are deployed as the shrimp clings to sponge filter air-tube stem or sponge surface) but substrate-sweeping is more common. The latter behavior, from my intermittent observations, may have increased in frequency due to conditioning over the duration of its captivity -- at present, this shrimp will acrobatically zip over to flake food. Said fan apparatus displays some interesting physical properties -- they're capable of rapidly lifting and roiling disproportionally large grains of sand. Swimming is rapid and jetlike. Behavioral interaction with the cherries is limited, but there seems to be a disconnect in tactile/visual communication; blithe forward barging of foraging cherries elicits short bursts of backward retreat, as though in response to an aggressive display. Antennae-waving and nudging may also be seen in these circumstances (no response from the cherries), but never any offensive use of the pereiopods (as reported with Atyopsis and Atya).
