On a new species of Keratella (Rotifera: Monogononta: Brachionidae)

Abstract

A new species of planktonic rotifer, Keratella trapezoida n. sp. is described from the Yangtze River, P.R. China. The new morphospecies is characterized by its four enclosed dorsal median facets, nearly trapezoid shape of the first median facet on dorsal plate, and the caudal median facet with parallel margins and being open posteriorly.

The genus Mytilina in China, with description of a new species <br />(Rotifera: Monogononta: Mytilinidae)

“…Indeed, recent studies have questioned the appurtenance of some of these variants to their respective nominal taxa. The case of Mytilina michelangelii Reid & Turner, 1988 is illustrative: the animal was originally described as a variant of M. ventralis, but later recognized as separate taxon at subspecies (Reid & Turner 1988) or species level (Pourriot 1996), and is now established as a widespread tropical species, occurring in South America, Africa, and the Oriental region (Segers 1997;Sa-ardrit et al 2013). A similar situation may be the case for the animal depicted as M. ventralis macrantha in Koste (1972: plate 6 Fig.…”

“…This holds in particular for Rotifera, as representative taxon of Micrometazoa that are main constituents of freshwater ecosystems, in PR China (see Fontaneto et al 2012). Most existing records of Chinese representatives of this crucial zooplankton group are quite old and based on outdated taxonomy (Wang 1958;1961;Gong 1983), notwithstanding that a number of reports have recently become available (Koste & Zhuge 1996;Luo et al 2012;Segers & Wang 1997;Segers & Su 1998;Zhuge & Huang 1997;Zhuge et al 1998), including works involving molecular techniques (e.g., Xiang et al 2010) and works involving rotifers in ecological research (e.g., Wen et al 2011). A re-examination of available records is therefore needed to produce a solid basis for future comprehensive work on biodiversity of the taxon in PR China.…”