Morphology and Ontogenesis of Psilotrichides hawaiiensis nov gen., nov spec. and Molecular Phylogeny of the Psilotrichidae (Ciliophora, Hypotrichia)

作者：Heber Domingo; Stoeck Thorsten; Foissner Wilhelm^*

来源：Journal of Eukaryotic Microbiology, 2014, 61(3): 260-277.

DOI：10.1111/jeu.12104

• Biodiversity
• development of oral primordium in a deep pouch
• Hawaiian archipelago
• Japanese rice field
• migrating kinetofragment
• oral pattern
• revision

The Psilotrichidae are a family of middle-sized hypotrichs with unique morphological and ontogenetic features (e.g. the oral primordium develops in a deep pouch) that, however, did not provide a definite phylogenetic signal. Thus, we studied the 18S rRNA gene of Urospinula succisa (Muller 1786) Esteban etal., 2001 as well as the morphology and ontogenesis of Psilotrichides hawaiiensis, a new genus and species from an ephemeral swamp on Oahu Island, Hawaii. The molecular data classify the psilotrichids into the oxytrichids but without clear branching position. A brief revision, using the structure of the oral apparatus, the location of the contractile vacuole, and three ontogenetic features, showed four distinct genera: Psilotricha Stein, 1859; Urospinula Corliss, 1960; Hemiholosticha Gelei, 1954; and Psilotrichides nov. gen., which differs from the confamilials mainly by the obliquely oriented buccal cavity and the shape of the undulating membranes as well as by a distinct ridge along the right buccal margin. The pyriform species, P. hawaiiensis, is about 65x45m in size and is easily recognized by the table tennis racket-shaped appearance due to the elongated last cirrus of the left marginal row. Refined diagnoses are provided for the family Psilotrichidae Butschli, 1889 and the genera contained.

• 出版日期2014-5