Cradoscrupocellaria osburni, VIEIRA & JONES & WINSTON, 2013

VIEIRA, LEANDRO M., JONES, MARY E. SPENCER & WINSTON, JUDITH E., 2013, <p class = " HeadingRunIn " align = " left "> <strong> <em> Cradoscrupocellaria </ em>, a new bryozoan genus for <em> Scrupocellaria bertholletii </ em> (Audouin) and related species (Cheilostomata, Candidae): taxonomy, biodiversity and distribution </ strong> </ p>, Zootaxa 3707 (1), pp. 1-63 : 40-41

Cradoscrupocellaria osburni n. sp.

( Fig. 19 , Table 4)

Material examined. Holotype. NHMUK 2010.6 .14.3 ( Fig. 19 ), Panama.

Type locality. Panama .

Etymology. Honorific for the late American bryozoologist Raymond Carroll Osburn (1872–1955).

Diagnosis. Chitinous joints passing across proximal end of opesia in outer zooids at bifurcation (zooids C and D); zooids with 6–7 distal spines; scutum slender, branched three times, with acute tips; small distolateral avicularium on each zooid; frontal avicularia variable in size, with triangular mandible, obliquely directed downward.

Description. Colony erect, branches comprising 5–7 zooids. Internodes with alternating zooids, slightly back to back; acute bifurcating pattern; chitinous joints passing across proximal end of opesia in both outer zooids at bifurcation (zooids C and D) and across proximal gymnocyst of inner zooids (F and G). Autozooids elongate, subrectangular, slightly tapering proximally. Oval opesia occupying three quarters of frontal surface; cryptocyst smooth and deep, forming a narrow strip around opesia. Scutum slender, branching three times, with acute tips, inserted at midline of inner opesial border and overarching part of frontal membrane. Distal spines straight to slightly curved, 1ong, delicate, unbranched; 2–3 inner and 4 outer distal spines; axial zooid with 6 spines. One conspicuous distolateral avicularium on each zooid, directed laterally; rostrum triangular, with serrated lateral edges and slightly hooked tip. Frontal avicularia variable in size, present in outer zooids along internodes, with triangular curved rostrum, serrated, with short hooked tip, directed obliquely forward and downward. Vibraculum on basal surface of each zooid, inconspicuous in frontal view; chamber trapezoidal, occupying a quarter of basal surface, with a rhizoidal foramen in its proximal outer corner; setal groove transverse to internode axis of internode, with smooth seta as long as one autozooid. Single axial vibraculum without rhizoidal foramen. Rhizoids tubular, smooth. Ovicells not observed.

Remarks. Cradoscrupocellaria osburni n. sp. resembes C. atlantica in the position of the joints that pass across the opesiae of the outer zooids at the bifurcation, the shape of the frontal scutum and in having a distolateral avicularium; this species, however, differs in the number of distal spines (6–7 in non-ovicelled zooids) and the shape and position of the frontal avicularia. Cradoscrupocellaria gorgonensis is distinguished from C. osburni by its very large frontal avicularia and wide cryptocyst around the opesia.

Distribution. Pacific Ocean: Panama.

Species having stout scutum with truncate tips

Figures

FIGURE 19. Cradoscrupocellaria osburni n. sp. A–F, NHMUK 2010.6.14.3, holotype, Panama. A, Frontal surface of colony. B, Frontal surface of branch bifurcation; note joints passing across the proximal end of the opesia in outer zooids at the bifurcation. C, Close-up of a branch bifurcation; note two diferent sizes of frontal avicularia. D, Close-up of axial zooid; note the presence of six and seven distal spines in proximal zooids. E, Abfrontal surface of colony.