Tydeus nieuwkerkeni, André, 2005

André, Henri M., 2005, In search of the true Tydeus (Acari, Tydeidae), Journal of Natural History 39 (13), pp. 975-1001 : 993

Tydeus nieuwkerkeni n. sp.

( Figures 2D , 3C , 4C , 5C , 6C , 11 )

This description refers to the two other slides of Oudemans’ collection bearing the label ‘‘ Tydeus spathulatus’’, that contain specimens from Renkum in the Netherlands. The habitus, leg chaetotaxy and other generic characters are similar to those of Tydeus spathulatus . However, the species is undescribed and is characterized by three pairs of short, spatulate setae ( Figure 11A ). These setae are shorter than homologous setae in spathulatus (compare Figure 5C and E ). Dorsal setae on genua are similar to those of spathulatus but more serrate ( Figure 11C, D ).

The length of the idiosoma (in M m) is 344¡74 (n 53) in females. NS(vi)527, NS(ep)518.

Another specimen of the species was collected in Samrée ( Belgium), from the bark of Fraxinus excelsior along a road.

Designation of types

The five specimens from the slide with the data ‘‘Castanea sativa, Renkum bij Arnhem’’ were remounted separately and form the type-series. The slide with the original label contains the female holotype, the other four slides with new labels contain paratypes.

Figures

Figure 2. The two types of genital striation pattern, extended (A, B) and compact (C, D). (A) Tydeus croceus; (B) T. cruciatus; (C) T. spathulatus; (D) T. nieuwkerkeni. Scale bar: 10 Mm.

Figure 3. Striae density on prodorsum in Tydeus croceus (A), T. cruciatus (B), T. nieuwkerkeni (C) and T. spathulatus (D). NS(vi)528, 22, 27 and 26, respectively. Scale bar: 10 Mm.

Figure 4. Striae density on the 3rd intercoxal area in Tydeus spathulatus (A), T. cruciatus (B) and T. spathulatus (C). NS(ep)536, 18, 32, respectively. Scale bar: 10 Mm.

Figure 5. Shape of terminal dorsal setae, serrate (A), smooth (B), spatulate (C), and lanceolate (D, E). (A) Tydeus croceus; (B) T. cruciatus; (C) T. nieuwkerkeni; (D, E) T. spathulatus. Scale bar: 10 Mm.

Figure 6. Outline of the coxal organ in Tydeus croceus (A), T. spathulatus (B), T. nieuwkerkeni (C), and T. cruciatus (D). Depending on the orientation or state of specimens, the outline may be deformed due to perspective (C) or difficult to see (D).

Figure 11. Tydeus nieuwkerkeni n. sp. The three spatulate terminal dorsal setae (A), serrate seta of the opisthosoma (B), dorsal setae of genu II (C) and III (D). Scale bar: 10 Mm.