Plumatella hartikainenae, Wood & Okamura, 2022

Wood, Timothy S. & Okamura, Beth, 2022, Further species and range extensions of Amazonian bryozoans: chipping away at the iceberg, Zootaxa 5169 (4), pp. 381-391 : 385-386

publication ID

https://doi.org/ 10.11646/zootaxa.5169.4.7

publication LSID

lsid:zoobank.org:pub:4B39AD1B-2643-4B84-B9A4-E83B07F33179

DOI

https://doi.org/10.5281/zenodo.6952466

persistent identifier

https://treatment.plazi.org/id/03EC8783-7B67-FFBA-44D4-2EB8FA17F8F8

treatment provided by

Plazi

scientific name

Plumatella hartikainenae
status

sp. nov.

Plumatella hartikainenae n. sp.

( Fig. 4 View FIGURE 4 )

Material examined. Holotype: ZUEC BRY 60 View Materials , from the Río Negro , municipality of Iranduba, 6 km SW Manaus, Amazonas State, Brazil, 3˚ 9.956’ S, 60˚ 3.264’ W (Site 9), collected 8 May 2018 by T. Wood and B. Okamura . Paratype: NHMUK 2021.11 About NHMUK .23.9, same details as holotype. Colonies attached to an abandoned foam rubber sandal, including floatoblasts but no sessoblasts. Additional unregistered material from the Río Tapajos, 10 km N of Santarem, Pará State, Brazil, 2˚ 19.700’ S, 54˚45.210’ W (Site 14), collected 14 May 2018 by T. Wood and B. Okamura. Colonies attached to emergent reeds, including floatoblasts but no sessoblasts .

Etymology. The specific name honors Hanna Hartikainen, an assistant professor at the University of Nottingham, who has substantially contributed to the understanding of phylactolaemate evolutionary ecology, diversification and interactions with myxozoan parasites.

Description. The colony spreads widely, with long branches adhering closely to the substratum, body wall soft, colorless, and transparent, with no trace of raphe or furrow ( Fig. 4a View FIGURE 4 ); floatoblasts elongate and often present a diamond shape, widest in the middle and curving gently to broadly rounded ends ( Fig. 4b View FIGURE 4 ), lateral profile showing floatoblast unusually thin and characterized by a suture that is entirely linear, not curved ( Fig. 4c, f View FIGURE 4 ), dorsal and ventral fenestrae similar in size, with the dorsal annulus encroaching just slightly more over the capsule ( Fig. 4b, d View FIGURE 4 ), both fenestrae bearing well defined, rounded tubercles ( Fig. 4e View FIGURE 4 ), polar grooves on the dorsal valve indistinct. Floatoblast dimensions are shown in Table 1 View TABLE 1 .

Remarks. This appears to be the same species noted and illustrated by Wiebach (1970) as Plumatella javanica from the Amazon Basin. That material had reported floatoblast dimensions of 460 by 260 µm, which conform to the measurements of P. hartikainenae n. sp. Corresponding dimensions for P. javanica are considerably smaller ( Kraepelin 1906, Wood et al. 2006). Previously, Wiebach (1967) had suggested that P. javanica appears in many forms, so he was prepared to allow for this difference in floatoblast size. However, there is also a difference in the relative dimensions of the floatoblast ventral fenestra: large and oval in P. javanica but smaller and circular in P. hartikainenae n. sp.. So far, no bryozoans matching the holotype of P. javanica have been seen in South America.

ZUEC

Museu de Zoologia da Universidade Estadual de Campinas

T

Tavera, Department of Geology and Geophysics

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