| evolutionary relationships among the protostrongylidae (nematoda: metastrongyloidea) as inferred from morphological characters, with consideration of parasite-host coevolution. | the phylogeny of nematodes in the family protostrongylidae (nematoda: metastrongyloidea) was reconstructed by cladistic analysis of 28 binary and multistate characters derived from comparative morphology. analyses were hierarchical, and examined (1) relationships among genera, including 13 ingroup taxa and metastrongylidae as an outgroup (single tree, 78 steps, consistency index [ci] = 0.705); and (2) relationships among genera and species groups, including 21 ingroup taxa and metastrongylus apr ... | 1999 | 10461943 |