Licornia

Martino, Emanuela Di & Taylor, Paul D., 2018, Early Pleistocene and Holocene bryozoans from Indonesia, Zootaxa 4419 (1), pp. 1-70 : 15-16

Licornia sp.

( Figs 29–32 ; Table 9)

Figured material. RGM.1350552, Holocene, UPGG 041, off South Sulawesi.

N, Number of colonies and number of zooids measured; SD, standard deviation.

Description. Colony erect, flexible, jointed; branches presumably biserial but broken into a uniserial series in the single specimen available. Autozooids club-shaped, longer than wide (mean L/W = 1.66). Gymnocyst extensive proximally, tapering laterally and reduced distally, flat, smooth; cryptocyst forming a narrow border around the opesia. Opesia oval with an undulate margin, occupying about half of the frontal surface. Oral spines absent. Base of scutum only on the inner margin of the unique ovicellate zooid. A structure resembling a small, frontal, adventitious avicularium present in one of the zooids, seemingly triangular and directed outwardly and distolaterally, about 65 µm long by 40 µm wide. Marginal lateral avicularia small, 55–60 µm long, placed on the distolateral corner of the opesia, directed outwardly and laterally. A single broken ooecium present, 130 µm long by 145 µm wide. Dorsal side occupied by drop-shaped vibracular chambers, tapering distally, 270 µm long by 110 µm wide, with a 30 µm wide, straight, transverse setal groove, and a rhizoidal foramen.

Remarks. Only half an internode of Licornia sp. was found in our samples. Licornia sp. is characterized by the presence of scuta only on ovicellate zooids, as in L. cyclostoma ( Busk, 1852) ( Vieira et al. 2014) .

Figures

FIGURES 29–32. Licornia sp., RGM.1350552, Holocene, UPGG041, off South Sulawesi. 29. View of the half internode. 30. Close-up of an autozooid with incomplete ooecium, scutum base, distolateral avicularium and vibraculum in frontal view. 31. Close-up of a zooid with a putative frontal avicularium. 32. Close-up of the vibracular chamber on the dorsal side. Scale bars: Fig. 29 = 500 µm; Figs 30–32 = 100 µm.