Tubulipora, LAMARCK, 1816

HAYWARD, PETER J. & McKINNEY, FRANK K., 2002, Northern Adriatic Bryozoa From The Vicinity Of Rovinj, Croatia, Bulletin of the American Museum of Natural History 2002 (270), pp. 1-139 : 12-14

Tubulipora (fig. 3A). The lophophore

was a radially symmetrical bell of eight

tentacles; this is consistent with B.

gracilis, but there are no other grounds

for identifying it with this taxon. 2. A large species (fig. 3B) with a short

cylindrical collar and an elongate radi­

ally symmetrical bell of eight tentacles. 3. A slightly larger epizoic species (fig.

3C) with a diffuse colony form of dis­

persed zooids on an unseen stolon. The

lophophore was a bilaterally symmet­

rical, campylonemidan bell with 10

tentacles. Finally, an unidentified stolonate ctenostomate (fig. 3D) with a large lophophore of at least 16 tentacles and a flared collar to which much debris adheres must remain completely unattributed: no species of Bowerbankia has such a large lophophore and it is unclear to which genus this species belongs.

GENUS AMATHIA LAMOUROUX, 1812

Amathia pruvoti Calvet, 1911

Figure 4A

Amathia pruvoti Calvet, 1911: 59 . Hayward, 1985: 136. Chimonides, 1987: 336.

DESCRIPTION (AMNH 889; CMRR 2202): Colonies sparse, erect tufts, to 2 cm in present material, of stiff, kenozooidal stolons, colorless at extremities but light brown basally; attached by an encrusting portion of stolon, without additional rhizoids. Stolon of constant width, ca. 0.175 mm, not tapering distally, bifurcating at intervals of 3–6 mm; slightly curved prior to the dichotomy, one ramus deflected at approximately 40° to main axis, subsidiary ramus at ca. 60° and alternating left and right along the major axis. Autozooids cylindrical, closely adherent to stolon, arranged in tight biserial groups, each originating proximal to the dichotomy at one­third to one­half distance between it and preceding dichotomy. Six to 10 pairs of autozooids in each group, with a single, unpaired proximal autozooid; forming a half spiral of about 90° around stem, with autozooid length decreasing successively distally.

REMARKS: Chimonides (1987) provided a detailed analysis of colony morphology in this and several other species of Amathia , stressing the significance of growth pattern for discriminating between them.

DISTRIBUTION: Amathia pruvoti is widespread and common in shallow coastal waters throughout the Mediterranean, and on the southwest coasts of the British Isles.

Amathia vidovici ( Heller, 1867)

Figure 4B

Valkeria vidovici Heller, 1867: 128 .

Amathia vidovici: Prenant and Bobin, 1956: 283 . DESCRIPTION: A single small tuft of this species was collected, 7.5 mm high, comprising two stolon bifurcations and six autozooid groups. Stolon 0.2 mm wide; autozooid groups each consisting of a single proximal autozooid and about eight pairs, all about the same height. Each group forming a complete spiral of 360° around the stolon, usually commencing just proximal to a bifurcation and enclosing bases of the two daughter kenozooids; one group of autozooids was situated midway between two successive bifurcations, a characteristic of the species noted by Prenant and Bobin (1956). Basal attachment of A. vidovici remains quite unknown ( Chimonides, 1987).

REMARKS: We could not locate any type material of Valkeria vidovici in the UIIZ collections; instead, we illustrate part of a specimen of A. vidovici from an unspecified locality in the Adriatic, in the collections of the University of Innsbruck Institute of Zoology (specimen 366). Although little material of this species was collected, its morphology is recognizably that of A. vidovici , which was named for material from the Adriatic ( Heller, 1867).

DISTRIBUTION: Amathia vidovici is widely distributed in shallow coastal waters of the Mediterranean, and ranges north to Roscoff, Brittany. It has been recorded in the western Atlantic form Colombia to Massachusetts, from the Cape Verde Isles and from east Africa, a broad geographical range which perhaps requires reinvestigation.

ORDER CHEILOSTOMATA BUSK, 1852

SUBORDER INOVICELLATA JULLIEN, 1888

SUPERFAMILY AETEOIDEA SMITT, 1867a

FAMILY AETEOIDAE SMITT, 1867a GENUS AETEA LAMOUROUX, 1812

Aetea sica ( Couch, 1844) Figure 5A–C

Hippothoa sica Couch, 1844: 102 .

Aetea sica: Alvarez, 1990: 24 . Hayward and Ryland, 1998: 102.

DESCRIPTION (AMNH 890, 891; CMRR 2203): Colonies forming delicate, branching traceries over biogenic substrata, especially shell, with autozooids in branching linear chains. Encrusting proximal portion of autozooid consisting of a filiform part of variable length, but just 0.05 mm wide, broadening abruptly to a substantial fusiform part 0.5 mm long and 0.2 mm wide, from which the erect distal portion arises. This also varies in length, to 1.5 mm in present material, with a basal width of 0.1 mm, gently broadening to about 0.15 mm at the distal end. Opesia occupying distal third of erect portion. Calcification thin and delicate, that of encrusting portion smooth and imperforate, erect portion finely but distinctly annulate.

Tentacles clear, 10; lophophores broadly conical, radially symmetrical.

DISTRIBUTION: Occurs on a wide variety of organic and inorganic substrata, in shallow coastal waters throughout the Mediterranean. Aetea sica has been recorded from most of the world’s seas, but its actual Distribution is probably more limited.

MEASUREMENTS (POLYPIDE): IH 60 µm (1, 1), LD 200–280 (2, 2), TL 250–420 (2, 2).

Aetea truncata ( Landsborough, 1852) Figure 5D–F

Figures

Fig. 4. A. Amathia pruvoti (AMNH 889; 0.5 mm). B. Amathia vidovici (UIIZ 366; 0.5 mm).

Fig. 5. A–C. Aetea sica. A. Group of zooids with adnate portion covered by thin sponge (AMNH 890; 0.5 mm). B. Erect portion of zooid, including opesia with terminal orifice (AMNH 891; 0.1 mm). C. Annulae around base of erect portion of zooid (AMNH 890; 0.1 mm) D–F. Aetea truncata. D. Group of zooids encrusting radula­scored shell surface (AMNH 892; 0.5 mm). E. Erect portion of zooid, including opesia and inclined terminal orifice (AMNH 893; 0.1 mm). F. Smooth base of erect portion of zooid (AMNH 893; 0.1 mm).