FIGURE 7 in Revision of Aspidoscopulia Reiswig, 2002 (Porifera: Hexactinellida: Farreidae) with description of two new species

FIGURE 7. The origin of equal (dichotomous) tubular branching and ear-like formation in Aspidoscopulia bisymmetrica sp. n. (developed after Reid, 1964). AI – AIII, common process of marginal growth with inward and outward flexure of segments of the growing oscula margin (AII, AIII). BIV – BV, dichotomous tubular branching. CIV – CV, formation of ear-like processes. I–IV, BA, CA, top view. BB, BV, CV, CB, side view. Lines in BA, BB, CA, CB, the courses followed by dictyonal strands. In A. bisymmetrica sp. n. all processes illustrated on this scheme take place: A, B, emission of lateral branches with lateral oscula from the main stem. A, B, lateral branch dichotomous branching into two secondary lateral branches with two secondary lateral oscula and formation of carina, A, C, lateral branch dichotomous branching into two secondary lateral oscula and formation of ear-like processes by side-by-side wall fusion. aa, atrial axis. ca, carina – line of wall joint fusion. fw, side-by-side wall fusion (ear-like processes formation). po, primary osculum. lo, (primary) lateral osculum. slo, secondary lateral osculum. I–IV, in A– V and B–V, positions of oscula margins of previous stages.