Caulophacus (Caulophacus) serpens sp. nov., NIWA 126084, spicules A hypodermal body pentactin B hypoatrial body pentactin C hypodermal stalk pentactin D two whole choanosomal hexactins and an enlarged ray end E two whole choanosomal diactins and enlarged ends and central swellings; F dermal body pinular pentactin G atrial body pinular pentactin H stalk dermal pinular pentactin I discohexactin with enlarged terminal ray and facial view of end disc J large thick-rayed discohexaster with two smaller thin-rayed discohexasters entangled K thin-rayed discohexaster and magnified terminal ray. Scale bar in A applies to B–E scale bar in F applies to G and H whole microscleres are at the same scale.