Pyrosejus verticis, Karg & Schorlemmer, 2011

Karg, W. & Schorlemmer, A., 2011, New Insights Into The Systematics Of Parasitiformes (Acarina) With New Species From South America, Acarologia 51 (1), pp. 3-29 : 7-10

Pyrosejus verticis n. sp.

Holotype — ~ Ecuador, 1989, Province Pichincha, between Pifo and Papellacta, 4100 m a.s.l. from felt-like debris under Jumble of dicotyledon, creeping to 2m height on a tree.

Paratypes — 9 ~, collectors I. Loksa and A. Zicsi.

Etymology — As to the well-developed vertex with relative long setae i1, z1, z2 and s1.

Diagnosis — Most dorsal setae remarkably long: 60 to 102 µm, on the post-dorsum setae I2 and Z2 absent, ~ between mesogynial shield and a median incision of the ventrianal shield a single distinct triangular shield ( Figures 3 , 5 ).

Description — Idiosoma ~ 348 – 374 x 244 – 270 µm, brown.

Dorsum: Divided into a pro-dorsum, a postdorsum and backwards setae z3 separate marginal shields, dorsal shields and the posterior part of venter with scale like patterns, posterior margin of the post-dorsum crenellated, most of the dorsal setae remarkably long, longest setae I1, I3 and s4: = 102 µm, i2 = 65, i3 = 60, i4 = i5 = 85, z1 = 48, z4 = 77, s3 = 92, s5 = 78, r3 = 70, I4 = 75, Z1 = Z3 = 95 µm long, setae at the vertex and at the posterior margin shorter however not reduced: i1 = 46, z1 = 65, s1 = 18, z2 = r2 = 20, I5 = 31 µm long.

Venter: With mesogynial-shield well developed and nearly rectangular, posterior part of the latigynial-plates broadened and with a second seta, the first seta between coxae III and IV, the first sternal setae on separate triangular plates, the second pair on an oval shield, also the third pair on a smaller oval shield, the fourth pair free on the soft cuticle, ventrianal-shield fused with the dorsum and with lateral and peritrematal shields, median of the ventrianal shield with a deep incision which is broadened posterior of the mesogynialshield and accommodates for a single triangular plate, surface of the ventrianal shield similar to the dorsum with scale like patterns, setae of the anterior part of the venter remarkably short, st1 = 34 µm long, the other 18 to 26 µm long, setae of the posterior part mostly longer, Vi2 = Vi3 = 34, Vi4 = 37, Vz1 = Vz2 = Vz3 = 50, Vz4 = 44 µm long, a strip of the marginal shields ventrally visible bearing the following dorsal setae: S3 = S5 = 80, Z4= 71, Z5 = 60 µm long, the anus remarkably small and with a pair of short adanal setae: Vi5 = 25 µm long.

Gnathosoma: Tritosternum with two laciniae recognizable, anterior margin of tectum denticulate with teeth of different size, margins of hypostome fused, hypostomatic setae on the palpal coxae 9 to 20 µm long: C1 = 20, C2 = 18, C3 = 13, C4 = 9 µm long, paralaciniae 16 µm long with a 8 µm wide dented basis, chelicerae strong and stout, 22 µm wide, digitus mobilis 34 µm long, with a big proximal tooth and 9 – 10 small teeth, digitus fixus with 7 – 8 medium-sized teeth.

Legs: I = 322, II = 261, III = 261, IV = 356 µm long appropriate an idiosoma 348 x 244 µm, tarsi I to IV with paired claws, at leg I longer however without pretarsus, at leg II to IV shorter and with pretarsus.

Taxonomy — Lindquist & Moraza (1993) described one new species of the new genus Pyroseius and a second form, which they consider to be a second new genus. However, our new species represents beyond its own characteristics also features of both, P. prionotus Lindquist et Moraza, 1993 and the assumed second new genus ( Table 1). That means we have found an intermediate species. The three forms therefore are separate species of the same genus.

Figures

FIGURE 3: Pyrosejus verticis n. sp. Female. Dorsum, 348 – 374 µm long.

FIGURE 5: Holostethus longosetis n. sp. Female. a – Dorsum, 957 – 1092 µm long; b – Tectum, 88 µm wide.