Cleaves phosphorylated sphingoid bases (PSBs or S1Ps) at the C2-3 carbon bond to yield a fatty aldehyde and phosphoethanolamine. These bioactive sphingolipid metabolites are essential for normal development, intestinal integrity, growth and reproduction. sphinganine 1-phosphate = hexadecanal + phosphoethanolamine 15-methylhexadecasphing-4-enine 1-phosphate = (2E)-13-methyltetradecenal + phosphoethanolamine 15-methylhexadecasphinganine 1-phosphate = 13-methyltetradecanal + phosphoethanolamine Lipid metabolism; sphingolipid metabolism. High expression found in the intestinal cells and faint expression in the head. Found in the majority of L1 larvae and in all L2, L3 and L4 larvae and adults showing medium to high expression. Highest levels found in older adults. Without spl-1 expression, animals become bloated, pale, congested with eggs and hatched larvae, and demonstrate shrunken gut and gonadal structures. Belongs to the group II decarboxylase family. Sphingosine-1-phosphate lyase subfamily.