Pyrosejus verticis Karg & Schorlemmer 2011, n. sp.
Creators: name: Karg, W.
name: Schorlemmer, A.
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Mesostigmata
Pyrosejidae
Pyrosejus
Pyrosejus verticis

description: 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.
description: Published as part of Karg, W. & Schorlemmer, A., 2011, New Insights Into The Systematics Of Parasitiformes (Acarina) With New Species From South America, pp. 3-29 in Acarologia 51 (1) on pages 7-10, DOI: 10.1051/acarologia/20111995, http://zenodo.org/record/5404294