Margaretta tenuis Harmer, 1957

Martino, Emanuela Di & Taylor, Paul D., 2018, Early Pleistocene and Holocene bryozoans from Indonesia, Zootaxa 4419 (1), pp. 1-70 : 41-42

publication ID

https://doi.org/ 10.11646/zootaxa.4419.1.1

publication LSID

lsid:zoobank.org:pub:03CAFD21-185F-4C86-ACC3-8CEB61E7F7DD

DOI

https://doi.org/10.5281/zenodo.3799580

persistent identifier

https://treatment.plazi.org/id/CF6D87AA-E866-D267-FF7D-FC820EA9FDB4

treatment provided by

Plazi

scientific name

Margaretta tenuis Harmer, 1957
status

 

Margaretta tenuis Harmer, 1957 View in CoL

( Figs 124–126 View FIGURES 124–126 ; Table 26)

Margaretta tenuis Harmer, 1957: 840 View in CoL , pl. 55, figs 13–18.

Figured material. RGM.1350574, Holocene, UPGG 041, off South Sulawesi.

Description. Colony erect, articulated. Internodes cylindrical, tapering proximally; basis rami tripartite, originating at the side of a peristome, raised, about 200 µm in diameter. Autozooids in whorls of three, distinct with shallow, interzooidal furrows, oval, elongate (mean L/W = 2.36). Frontal shield convex, smooth, regularly and evenly perforated by small, circular to slit-like pseudopores, 30–45 µm long, arranged in longitudinal rows, ascopore distomedial, located immediately proximally of the peristomial ridge, large, 60–80 µm in diameter, surrounded by a slightly raised, denticulate rim. Primary orifice transversely D-shaped; secondary orifice elliptical, about 120–140 µm long by 175 µm wide. Peristome moderately developed, longer proximally than distally, almost at right angle to the frontal plane, ridged with ridges projecting frontally to give the appearance of a denticulate oral rim, valleys between ridges porous, basal ridge distinct. Brooding zooids not observed.

Remarks. Two broken internodes of Margaretta tenuis were found in our samples. This species is distinguishable by the number of autozooids in each whorl (3), tripartite articulation, distinct zooidal boundaries and peristomial ridge, moderate, ridged peristome, and the ascopore adjacent to the peristomial ridge. Margaretta tenuis is widely distributed in the Indo-Pacific, from the Philippines south to Indonesia and Australia, with a depth range of 0– 45 m.

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

RGM

National Museum of Natural History, Naturalis

Kingdom

Animalia

Phylum

Bryozoa

Class

Gymnolaemata

Order

Cheilostomatida

Family

Margarettidae

Genus

Margaretta

Loc

Margaretta tenuis Harmer, 1957

Martino, Emanuela Di & Taylor, Paul D. 2018
2018
Loc

Margaretta tenuis

Harmer, S. F. 1957: 840
1957
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