ventrolaminidae ventrolaminidae the ventrolaminidae are a family of benthic foraminifera included in the involutinida, now part of the subclass spirillinana, class spirillinata. ventrolaminidaetemporal range: bajocian - berriasian scientific classification domain: eukaryota (unranked): sar (unranked): rhizaria phylum: retaria subphylum: foraminifera class: spirillinata order: involutinida family: ventrolaminidaeweynschenk, 1950 tests of the ventrolaminidae are lenticular, planispiral, or a low trochospiral with multiple chambers in a rapidly enlarging whorl. the wall is calcareous in two layers. the inner one is microgranular, the outer hyaline glassy). two genera are included, archaeosepta and protopeneroplis. loeblich and tappan included protopeneroplis (or ventrolamina, in the involutinidae in the treatise part c, 1964. archaeosepta was added hence, in 1970.