FIGURE 1 in Deep-sea serpulids (Annelida: Polychaeta) in tetragonal tubes: on a tube convergence path from the Mesozoic to Recent

FIGURE 1. External morphology of polygonal serpulid tubes. Recent species: A—Spirodiscus grimaldii, R/V VITYAZ-2, St. 78. B, C—Bathyditrupa hovei, R/V VITYAZ-2, St. 79. D—Spirodiscus groenlandicus comb. nov., R/V VITYAZ-2, St. 79. E— Bathyvermilia gregrousei sp. nov., R/V VITYAZ, St. 5074. F—Hyalopomatus dieteri sp. nov., R/V JEAN CHARCOT, cruise BIOCAL, St. CP27. G—Zibrovermilia zibrowii gen. et sp. nov., R/V ALIS, cruise MUSORSTOM 6, St. CP438. Fossil tubes: H, I—Nogrobs cf. vermicularis, PIN 5485/23. J–K—Glandifera cf. vertebralis, spirally coiled juvenile tube with median keel running along the lateral tube side, PIN 5485/02. L, M—Glandifera cf. vertebralis, a fragment of straight adult tube with regular peristomes, PIN 5485/01. N, O—Tetraserpula barremica, PIN 5485/06. P, Q—Tetraditrupa canteriata, PIN 5485/04. R–T—Tubulostium discoideum, ARI Od 224/70 (the specimen figured by Chiplonkar & Tapaswi, 1973, pl. 11, fig. 15).