Macrostomum dongyuanensis Wang & Sun
- Dataset
- Three new species of freshwater Macrostomum (Platyhelminthes, Macrostomida) from southern China
- Rank
- SPECIES
- Published in
- Sun, Ting, Zhang, Lv, Wang, An-Tai, Zhang, Yu (2015): Three new species of freshwater Macrostomum (Platyhelminthes, Macrostomida) from southern China. Zootaxa 4012 (1): 120-134, DOI: 10.11646/zootaxa.4012.1.6
Classification
- kingdom
- Animalia
- phylum
- Platyhelminthes
- class
- Rhabditophora
- order
- Macrostomida
- family
- Macrostomidae
- genus
- Macrostomum
- species
- Macrostomum dongyuanensis
description
Description. The body is flat, transparent and in milk white color. The length and width of its body is 2639 ± 274.2 µm (n = 4) and 631 ± 108.4 Μm (n = 4), respectively (Figs. 7 A – D, 8 A – B, 9 A).
discussion
Remarks. A dozen species are similar to M. dongyuanensis n. sp., i. e., M. bulbostylum Kepner & Stiff, 1932, M. curvituba Luther, 1947, M. axi Papi, 1959, M. balticum Luther, 1947, M. amurense Beklemischev, 1950, M. quiritium Beklemischev, 1951, M. georgeense Young, 1976, M. parmum Ball, 1977, M. magnacurvituba Ax, 1994, M. sinensis Wang, 2005, M. spec. 1 Ax, 2008 and M. spec. 2 Ax, 2008. The penis stylets (ps) of these species are all “ J ” shaped. Among them, the stylet distal ends of 5 species of Macrostomum, i. e., M. axi, M. balticum, M. sinensis, M. spec. 1 and M. spec. 2, are spine-shaped. In contrast, the distal end of the penis stylet (ps) in M. dongyuanensis n. sp. has no affiliated spine structure. As for M. magnacurvituba, M. bulbostylum, M. curvituba and M. quiritium, the distal ends of their stylets are clearly thickened. In M. georgeense, the base of penis stylet (ps) is slightly bent, the distal end is bent in a 90 ° angle, and the width of its anterior half is identical. In M. parmum, the length of penis stylet (ps) is 160 Μm. It prolongs in a funnel-shape and situates parallel to the mid-ventral line of the body, while the distal end is thickened and bends rightwards in a 90 ° angle. As for M. amurense, its penis stylet is similar to M. georgeense, except that its distal opening bends leftwards and has a groove. In contrast, the basal end of the penis stylet (ps) in M. dongyuanensis n. sp. is slightly bent. The distal end is bent in an obtuse angle, and has no spine nor thickening structures. To sum up, the morphology of the penis stylet of M. dongyuanensis n. sp. is distinct from those of the above 12 similar species.
etymology
Etymology. The name of the new species is originated from the name of Dongyuan County, Heyuan City, Guangdong Province, China.
materials_examined
Material exmained. Holotype (PLA-Ma 0021): permanent slides of longitudinal section. Paratype (PLA-Ma 0022 - 23): permanent slides of longitudinal and horizontal sections. All specimens are deposited in IZCAS. The samples were collected at the same site as that of M. heyuanensis n. sp.
Name
- Homonyms
- Macrostomum dongyuanensis Wang & Sun