Family members are found in strongylid parasites (A. ceylanicum, N. americanus, H. contortus and Heterorhabditis bacteriophora) and in related non-parasitic clade V species (C. elegans, Caenorhabditis briggsae and P. pacificus), hence the name secreted clade V proteins (SCVPs). In A. ceylanicum, the encoded 150 residue proteins are predicted to be classically secreted [1].

1: The genome and transcriptome of the zoonotic hookworm Ancylostoma ceylanicum identify infection-specific gene families. Schwarz EM, Hu Y, Antoshechkin I, Miller MM, Sternberg PW, Aroian RV; Nat Genet. 2015;47:416-422. PMID:25730766