Microstomum rubromaculatum von Graff 1882

• Main Authors: Atherton, Sarah, Jondelius, Ulf
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2018
• Subjects: Biodiversity; Taxonomy; Animalia; Platyhelminthes; Rhabditophora; Macrostomida; Microstomidae; Microstomum; Microstomum rubromaculatum; Faroe Islands; Iceland; Ísafjörður
• Online Access: https://doi.org/10.5281/zenodo.5991931; http://treatment.plazi.org/id/BD084F11FFC06D1B07E4FD2BFDB3F8CC

Microstomum rubromaculatum von Graff, 1882 Figs 4–5 Material examined SWEDEN: 20 live specimens, Fiskebäckskil, Kristineberg Sven Lovén Center for Marine Research, 58°14′59″ N, 11°26′45″ E, 20 Aug. 2015, marine, sublittoral phytal on algae, M. Curini-Galletti leg. (Genbank accession MF185684 -96). Type locality ITALY: Gulf of Naples, Tyrrhenian Sea. Deposition not recorded. Habitat Marine, sublittoral phytal in algae (e.g., Sargassum sp.) or benthal on shells, fine sand and mud. Distribution Ireland: New Harbor, Galway, 1–2 m; Malahide Inlet, Dublin, 2 m (Southern 1936). England: Wembury (Meixner 1938). Faroe Islands: Vaagfjord, Suderø, 10 m (Steinböck 1931). France: Concarneau (von Graff 1913). Iceland: North of Ísafjörður, 1–2 m (Steinböck 1938). Sweden: Gullmar Fjord, Fiskebäckskil, 1–2 m (Westblad 1953; pers. obs. by author). Norway: Herdla (Westblad 1934; Karling 1953). Population description Microstomum with field of bright red pigmentation spots on each well-developed zooid; length of pigmentation stretches from just below the anterior tip to halfway to the brain, width of pigmentation somewhat variable: either predominately at the lateral margins and thinning toward the middle or, most frequently, a band that encircles the entire body (Fig. 4A). Other small orange-red droplets may be scattered within the parenchyma of some specimens, particularly around the anterior and pharynx (Fig. 4B–C). Body otherwise colorless, clear and reflective of intestine. Vegetative chains to four zooids long; maximum animal/zooid body length 2000/1400 µm. Body width generally consistent, accepting slight constrictions between zooids and at the level of the ciliary pits; slightly tapering toward the rounded anterior end. Posterior end bluntly rounded. Posterior rims of welldeveloped zooids with many 5–6-µm-long posterior adhesive papillae (Fig. 5). Epidermis uniformly covered with cilia. Bundles of 3–8 nematocysts present, scattered in the parenchyma (Karling 1966); each nematocyst 4–6 µm long (Fig. 4C). According to Westblad ...