FIGURE 6 in Three new species of shell-boring Dipolydora (Annelida: Spionidae: Polydorini) from the South China Sea and the Gulf of Thailand, Vietnam, with comments on the modified spines in posterior notopodia and sperm morphology in polydorins

FIGURE 6. Dipolydora spinosa sp. nov. morphometric relationships. A, caruncle length and anterior position of gizzard-like structure versus total number of chaetigers. B, last branchiate chaetiger and anterior position of notopodial awl-like spines versus total number of chaetigers. Correlation coefficients (r) and their significance are reported in Table 1.