One trait that is shared by the lophotrochozoa and ecdysozoa is.

They are bilaterally symmetrical body, triploblastic and protostome body.

Explanation:

Ecdysozoans consists of external covering made of chitin. The lophotrochozoans are animals that includes the annelids and molluscs. The lophotrochozoans is an ecological group that lives in freshwater, marine water and is one of the edible species. Ecdysozoans are marine organisms.

The bilateral symmertry, triphoblastic embryonic development, protostome characteristics are common features in these organisms.

These organisms may be coelomate or pseudocoelomate. These organisms have true tissues and organ system.

If north is straight up in the map, then the blue stream is flowing from NW to SE or upper left to lower right. I know the flow direction because the elevations of the stream bed go from 1000-600 to the lower right. There is a steep hill on the SW side going from 900 elevation at the stream valley to 1500 at the peak and I know it is steep because the contours above the stream are close together. On the NE side is a hill with a relatively gentle slope going from 800 to 1300 elevations and with fairly widely spaced contours which indicate the gentler slope.