Sumatrella, Kontschan, Jeno, 2015

Kontschan, Jeno, 2015, Sumatrellachelonica gen. n., sp. n., a new remarkable genus and species from Indonesia, Sumatra (Acari, Uropodina, Oplitidae), ZooKeys 484, pp. 1-10 : 2-3

Taxon classification Animalia Mesostigmata Oplitidae

Sumatrella gen. n.

Diagnosis.

Idiosoma small, oval, posterior margin rounded and very convex. All part of marginal shield wide and fused anteriorly to dorsal shield. Dorsal and ventral setae smooth and needle-like. Genital shield of female octagonal, without sculptural pattern and anterior process. Dorsal and marginal shields neotrichous. Corniculi horn-like, internal malae with several long branches. Hypostomal setae h3 longer than others, h2 situated outside the longitudinal row h1-h4 and shorter than others. Tritosternum with narrow basis, laciniae divided into two short and two long pilose branches. Epistome hemispherical and marginally pilose. Leg I without claw, trochanters II-IV with a triangular process.

Type species.

Sumatrella chelonica sp. n.

Etymology.

The name of the new genus refers to the name of island where the specimens were collected. Gender feminine.

Systematic notes.

On the basis of the shape of internal malae (divided into pilose branches), the absence of the T-shaped dorsal setae and the hypostomal setae h2 position lateral to row h1-h4, I refer this genus to Oplitidae . Recently several genera and species groups have been recognized in this family ( Kontschán 2010, Kontschán and Starý 2012, Wiśniewski and Hirschmann 1993), but the new genus differs from the others on the basis of the very convex idiosoma, the octagonal genital shield and the wide marginal shield. Only the genus Chelonuropoda Sellnick, 1954 shares this combination of character states with the new genus (i.e. very convex idiosoma and wide marginal shield) but the former differs in several characters, the most important of which are summarized in Table 1.