Hans De Blauwe

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Meenakshi Bharti

Punjabi University

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Manipal Academy of Higher Education

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Universidade Estadual de Feira de Sanana

Silvio Nihei

Universidade de São Paulo

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DePaul University

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Yuzuncu Yil University

Adolfo Calor

UFBA - Federal University of Bahia

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Federal University of Bahia

Mohamed Abdrabbo

Agricultural Research Center

Prahlad Deb

Visva-Bharati, Santiniketan, India

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Papers by Hans De Blauwe

Morphology of ctenostome bryozoans: 6. Amphibiobeania epiphylla

Journal of Morphology

First record of the recently described Korean bryozoan Primavelans glabricollaris Min, Chae, Yang, Noh, Lee & Seo, 2021 (Cheilostomatida: Pacificincolidae) from the North-east Atlantic

BioInvasions Records, 2022

Watersipora Neviani 1895

Genus Watersipora Neviani, 1895 (Cheilostomatida: Smittoidea: Watersiporidae) ... more Genus Watersipora Neviani, 1895 (Cheilostomatida: Smittoidea: Watersiporidae) Diagnosis. Colonies encrusting, uni- to multilaminar, or suberect to erect, bilaminar; autozooids with an evenly perforated, often transparent, frontal shield with the compensation sac (ascus) below it (Hyman 1959, figure 120 D, E); a pair of small areolar septula, each multiporous, positioned beside the orifice, also appear to be a generic character; vertical walls perforated by large, multiporous rosette plates (septula). Primary orifice often sinusoid, with prominent condyles (cardellae); no spines. Opercula with straight or curving, lengthwise sclerites, often darkly pigmented (especially between the sclerites); sometimes with a pair of internal proximobasal knobs showing from above as translucent spots (lucidae). No avicularia. No external ovicells; each embryo brooded in a distally situated internal embryo sac (Waters 1909, pl. 15, 4). Ancestrula oval in outline,...

FIGURE 3 in Recent discoveries of alien Watersipora (Bryozoa) in Western Europe, with redescriptions of species

FIGURE 3. Scanning electron micrographs of Watersipora subtorquata from (A–C) St Peter Port, Guer... more

FIGURE 1. Watersipora subtorquata. A, B in Recent discoveries of alien Watersipora (Bryozoa) in Western Europe, with redescriptions of species

FIGURE 1. Watersipora subtorquata. A, B. Orange colonies from St Peter Port, Guernsey (no scale);... more

Watersipora subovoidea d'Orbigny 1852

Watersipora subovoidea (d'Orbigny, 1852) ( Fig. 4 C, D, G, H) Ce... more Watersipora subovoidea (d'Orbigny, 1852) ( Fig. 4 C, D, G, H) Cellepora subovoidea d'Orbigny, 1852: 402. Lepralia cucullata Busk, 1854: 81, pl. 96, figs 4, 5. Schizoporella cucullata var. labiosa Calvet, 1903: 141 –142, pl. 16, fig. 7 a –c. Smittia ( Watersipora) cucullata: Neviani 1895: 83. Lepralia? cucullata: Waters 1909: 150, pl. 15, figs 2–4 [pars]. Watersipora cucullata: Hastings 1930: 729 [pars], pl. 15, figs 97–101 ( not 102–104); Soule &amp; Soule 1976: 306, pl. 2, figs 1–2; pl. 3, fig. 1; pl. 4, fig. 3; also pl. 3, fig. 2, as Cellepora ovoidea, from Savigny's ( 1817) plate. [? Not] Dakaria subovoidea: Harmer 1957: 1022, pl. 69, figs 11, 12, 14. Watersipora subovoidea: Gautier 1962: 183; Ryland 1965: 68, figs 33 c, d; 1974: 345, fig. 3 A; Soule &amp; Soule 1976: 302, pl. 3, fig. 4; pl. 4, fig. 4; Zabala 1986: 396, fig. 129; Hayward &amp; McKinney 2002: 63, fig. 29 A, B. Material examined. All specimens are in the Natural History Museum, London. Naples, Italy, 20 - 10-1960, JSR ( 1 slide, intact, NHM 2007.12.14.2); Arrawarra, New South Wales, Australia, January 1772, JSR ( 3 slides: 1 cleaned, NHM 2007.12.14.3; 2 decalcified, NHM 2007.12.14.4– 5) ( Ryland 1974); Port of Genoa, Italy, 12 - 11-2007, M. Faimali ( 3 slides: 1 cleaned, NHM 2007.12.14.6; 2 decalcified, NHM 2007.12.14.7– 8). Description. Colonies encrusting, unilaminar, multilaminar or sometimes foliaceous, brownish-purple to almost black in life (fading to grey when dried), with the growing margin orange. Zooids subrectangular or slightly hexagonal, sometimes narrower proximally (usually when associated with row division); large, distinct, about twice as long as wide, 700–1100 (mean ~ 900) × 350–650 (mean ~ 450) μm (globally; Table 2), variable within and between colonies. Frontal skeletal wall rather flat, perforated by numerous large round pseudopores 20–30 μm diameter; in some zooids two or more distal pores, largely concea [...]

Watersipora subtorquata d'Orbigny 1852

Watersipora subtorquata (d'Orbigny, 1852) ( Figs 3, 4 A, C, E, F)<i&gt... more Watersipora subtorquata (d'Orbigny, 1852) ( Figs 3, 4 A, C, E, F) Escharina torquata [Milne] Edwards: d'Orbigny 1842, pl. 4, fig. 3; 1847: 11. Schizoporella atrofusca Busk: Hincks 1868: 269, pl. 10, figs 4–5. Schizoporella aterrima Ortmann, 1890: 49, pl. 3, fig. 36. Lepralia? cucullata: Waters 1909: 150, pl. 15, figs 1, 5 [pars]. Watersipora cucullata: Hastings 1930: 729 [pars], pl. 15, figs 102–104 only. Watersipora cucullata: Marcus 1937: 118, pl. 24, fig. 63 A, B. Watersipora cucullata: Mawatari 1952: 14, fig. 1 A –E ( not 1 F). Watersipora cucullata var. watersi Mawatari, 1952: 16, fig. 1 G [?] Dakaria subovoidea: Harmer 1957: 1022, pl. 69, figs 11–13. Watersipora subtorquata: Ryland 1974: 345, fig. 3 C. " Watersipora subovoidea " fide Harmer: Soule &amp; Soule 1976: 302, pl. 3, fig. 4; pl. 4, fig. 4. Watersipora subtorquata: Soule &amp; Soule 1976: 302, pl. 2, fig. 3; pl. 3, fig. 3; Gordon 1989: 40, pl. 20, B –H); Seo 1999: 222, fig. 1; Taylor &amp; Gordon 2002: 4, reproducing d'Orbigny's original figures (fig. 1 A, B) and giving an SEM of the holotype ( Fig. 1 C); Florence et al. 2007: 39, fig. 14 I J. Material examined. All specimens are in the Natural History Museum, London. Low Isles, Queensland, Australia (Great Barrier Reef), July 1972, JSR ( 2 slides: 1 intact, NHM 2007.12.14.9; 1 cleaned, NHM 2007.12.14.10) ( Ryland 1974); Bay of Arcachon, on shell (NHM 2007.12.14.11), HDeB, August 2003 ( 1 slide, decalcified, NHM 2007.12.14.12); St-Jacut-de-la-Mer, Brittany, France, HDeB, April 2005 (on oyster shell, NHM 2007.12.14.13; SEMs; 2 slides: 1 cleaned, NHM 2007.12.12.14; 1 decalcified, NHM 2007.12.14.15); St Peter Port harbour, Guernsey, Channel Islands, May 2007, RL (SEM; 3 slides: 1 intact, NHM 2007.12.14.16; 1 cleaned, NHM 2007.1.14.17; 1 decalcified, NHM 2007.12.14.18). Description. Colonies encrusting, subcircular or with broad, spreading lobes, often overgrowing older [...]

Morphology of ctenostome bryozoans: 1. Arachnidium fibrosum

Journal of Morphology, 2020

The morphology of ctenostome bryozoans remains little investigated with only few species having b... more The morphology of ctenostome bryozoans remains little investigated with only few species having been subject to more detailed studies. From all the seven main different superfamilies, only few representatives have been studied. The superfamily Arachnidioidea has particularly been neglected concerning detailed morphological and histological details. So far, not a single analysis specifically studied a representative of the family Arachnidiidae. Arachnidium-like forms have, however, often been regarded as potential cheilostome ancestors, the most successful group of bryozoans to date. The lack of any morphological data on this family called for a detailed investigation of one of its representatives. Hence, we analysed the general morphology and histology of Arachnidium fibrosum. Most striking morphological features previously unrecognized are a cardiac constrictor, previously almost unknown in the family, a single pair of apertural muscles consisting of proximal parieto-diaphragmatic and distal parieto-vestibular muscles, six pairs of duplicature bands, a lophophoral anus and retractor muscles attaching to the foregut. Although comparative data are limited, there seem to be two distinct different clades of arachnidiid ctenostomes that are characterized by their aperture and details of gut morphology. Further analysis of additional arachnidioidean species are required to confirm this.

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Recent discoveries of alien Watersipora (Bryozoa) in Western Europe, with redescriptions of species

Zootaxa, 2009

We report the introduction of the encrusting bryozoan Watersipora subtorquata to Atlantic coasts ... more We report the introduction of the encrusting bryozoan Watersipora subtorquata to Atlantic coasts of Europe. This species is highly invasive, having become common on coastlines throughout cool-temperate areas of the world since the 1980s. Confusion exists over the identity of this and other Watersipora species, which lack characters that are conventionally used in bryozoan systematics. W. subtorquata has not been well distinguished from W. cucullata which, reports dating back to the mid 1800s suggest, is native to the Mediterranean Basin or represents an early shipping introduction. W. cucullata has been placed in synonymy with W. subovoidea, a taxon lacking a holotype. We designate a neotype for W. subovoidea, recognizing its conspecificity with W. cucullata, and demonstrate a simple morphometric means of separating this species from W. subtorquata using zooid feature ratios (operculum area versus total frontal shield). An orange watersiporid population that was first recognized in ...

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De slijkgrascicade Prokelisia marginata (Hemiptera: Delphacidae), een exoot gebonden aan Engels slijkgras Spartina townsendii, verovert nu ook de Belgische kust

ABSTRACT

d'Udekem d'Acoz C., Faasse M., Dumoulin E., De Blauwe H., 2005. Occurrence of the Asian shrimp, Palaemon macrodactylus Rathbun, 1902, in the Southern Bight of the North Sea, with a key to the Palaemonidae of North-West Europe (Crustacea, Decapoda, Caridea). Nederlandse Faunistische Mededelingen, ...

De Blauwe, H. (2009). Mosdiertjes van de Zuidelijke bocht van de Noordzee: Determinatiewerk voor België en Nederland. Vlaams Instituut voor de Zee (VLIZ): Oostende. ISBN 978-90-812-9003-6. 445 pp

ABSTRACT

Recent discoveries of alien Watersipora (Bryo-Aoa) in Western Europe, with redescriptions of species

Zootaxa

ABSTRACT

Extension of the ranges of the bryozoans Tricellaria inopinata and Bugula simplex in the North-East Atlantic Ocean (Bryozoa: Cheilostomatida)

ABSTRACT

Kind et al 2015 Schizobrachiella Europe

39 - Diversity and Long-Term Changes in the Bryozoan Fauna of the Hinder Banks, Belgium

The Hinder banks rise about 25m above the seafloor and are about 20km long. Gravel fields are loc... more The Hinder banks rise about 25m above the seafloor and are about 20km long. Gravel fields are located in the gullies between the sand banks. The sand banks are characterized by large transversal sand waves. In a transitional zone, patches of gravels are present between large sand waves. The gravel field along the south-eastern flank of the Westhinder bank once hosted large flat oyster banks, which were destroyed by oyster dredgers in 1873. Nevertheless the samples of Gustave Gilson taken between 1900 and 1910 still reveal a very rich biodiversity on the Hinder Banks. Due to increased trawling, Gilson recommended in 1921 to protect gravel habitats. After the First World War, direct impacts to offshore gravels increased subsequently to the introduction motorized bottom trawling. After the collapse of herring in 1960, beam trawling was used to catch flatfishes with increasingly powerful ships. Continuous disturbance of the bottom has a devastating impact on erect growing fauna. Erect g...

De Blauwe H., d'Udekem d'Acoz C., 2012. Voortplantende populatie van de Purperslak Nucella lapillus in België na meer dan 30 jaar afwezigheid (Mollusca, Gastropoda, Muricidae) [Reproductive population of the dog whelk Nucella lapillus in Belgium after more than 30 years of absence (Mollusca, Gast...

In the past, the dog whelk Nucella lapillus (Mollusca, Gastropoda, Muricidae) used to be a common... more In the past, the dog whelk Nucella lapillus (Mollusca, Gastropoda, Muricidae) used to be a common species on jetties and groynes along the Belgian coast. During the seventies, the species became increasingly rare and the last Belgian specimen observed in situ was found in 1981. The extinction of the species is attributed to the use of paintings containing tributyltin (TBT) on the hulls of ships as antifouling protection. TBT dilutes in seawater and, even at extremely low concentration, sterilizes dog whelks. Since 1990, the use of Tributyltin (TBT) was restricted to ships smaller than 25 m; in 2003, it was totally forbidden and in 2008 old TBT paintings had to be removed from ship hulls. As a consequence the concentration in TBT of seawater presumably decreased in Belgian waters. On November 17th, 2012, several living adult dog whelks and 40 to 50 spawns ofthat species were observed on the concrete blocks of the western jetty of Zeebrugge harbour, indicating recolonization of the sp...

Resultaten van een Malaisevalcampagne in de vallei van de Zeverenbeek (Deinze, Oost-Vlaanderen, België)

We discuss the results of a Malaisetrap sampling campaign at Schave (Deinze, Oost-Vlaanderen) in ... more We discuss the results of a Malaisetrap sampling campaign at Schave (Deinze, Oost-Vlaanderen) in the valley of the Zeverenbeek, a former influent of the Leie. Characteristic for this study site are a thick layer of peat, the presence of some seepage areas, a structure-rich vegetation due to grazing and a mosaic of vegetation types. Ten taxonomic specialists contributed to the identification of the collected material and in total we could identify 217 insect species belonging to 33 families and 22 spider species belonging to 9 families. Among them are many habitat specialists of wet grasslands, swamps, wet brushwood, valleys and seepage areas.

Resultaten van een Malaisevalcampagne langs een brakke sloot in de Jeronimuspolder (Sint-Laureins, Oost-Vlaanderen, België)

During the summer of 2011 a Malaisetrap was set up along a brackish ditch in the Jeronimuspolder ... more During the summer of 2011 a Malaisetrap was set up along a brackish ditch in the Jeronimuspolder in Sint-Laureins to make an inventory of invertebrates. On the banks of the ditch a lot of Scirpus maritimus L. grows and a salty meadow is bordering the ditch. A total of 150 species were identified, belonging to 18 insect and 5 spider families. Seven species are halophilous or halobiont, comprising Stratiomyidae (two species), Dolichopodidae (three species), Muscidae (one species) and Cicadellidae (one species). Four other species are not true halophilous, but tolerate high salt concentrations. Amongst the non-halophilous species there are habitat specialists of reed vegetations, marshes and oligotrophic grasslands. Therefore it is important to maintain the patchwork of micro(habitats) for the conservation of the invertebrate diversity in the studied area. The Malaise trap sampling provided the first observation in Belgium for two Muscidae : Helina maculipennis and Coenosia antennata, ...

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Morphology of ctenostome bryozoans: 6. Amphibiobeania epiphylla

Journal of Morphology