Eothinia elongata Ehrenberg 1832
Eothinia elongata (Ehrenberg, 1832) Several fairly large specimens were found in the sample. All investigated specimens had trophi of bdelloid rotifers in their stomach. The species has not been recorded from Greenland previously, but has been found in Europe (Glascott 1893; Berzins 1949, 1978; Wulf...
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| Format: | Other/Unknown Material |
| Language: | unknown |
| Published: |
2006
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| Online Access: | https://zenodo.org/record/5680520 https://doi.org/10.5281/zenodo.5680520 |
| Summary: | Eothinia elongata (Ehrenberg, 1832) Several fairly large specimens were found in the sample. All investigated specimens had trophi of bdelloid rotifers in their stomach. The species has not been recorded from Greenland previously, but has been found in Europe (Glascott 1893; Berzins 1949, 1978; Wulfert 1960), Russia and former Soviet Union (Kutikova 1962, 1970), Asia (Fernando & Zankai 1981; Sharma & Pant 1985), Australia (Koste & Shiel 1980, 1991), North America (Harring & Myers 1922; Chengalath & Koste 1989) and Brazil (Segers & Dumont 1995). It is considered a rare cosmopolite. The species is distinguished by its trophi morphology combined with the presence of one large salivary gland, and one cerebral and two frontal eyes. The recorded specimens were generally typical but deviated in some details in the trophi. Trophi from two specimens were prepared for SEM (Fig. 2). The rami are large and slightly asymmetrical, with long, pointed alulae (Fig. 2 A–D). Most posteriorly on the ventral side, two extensions from each ramus form a small hinge (Fig. 2 E). Basifenestrae and subbasifenestrae are present. The apical rami parts bend dorsally and have a dense row of fine teeth (Fig. 2 C). Each ramus has approximately 20 teeth. A pair of small, twisted, fanshaped oral plates is attached on the ventral side of rami (Fig. 2 B). The fulcrum is clearly divided into a dorsal and a ventral part (Fig. 2 A, C–D). The dorsal part is broadened laterally and composed of relatively thick sclerofibrillae that are arranged both sidebyside and on top of each other. The ventral fulcrum part is much narrower laterally, composed of one horizontal row of thick sclerofibrillae. Each uncus has one tooth with a basal lamella (Fig. 2 F). Each manubrium is composed of a long distal cauda and a small proximal head. The head is formed by the walls of the medial and posterior manubrium chambers. Apertures from both chambers are located 1 / 3 from the proximal end of the manubrium (Fig. 2 A, D). A paired epipharynx ... |
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