Pseudoalliphis, Mašán, Peter & Halliday, Bruce, 2009

Mašán, Peter & Halliday, Bruce, 2009, Three new genera of the mite family Eviphididae (Acari: Mesostigmata), Zootaxa 2013, pp. 43-57: 44-45

publication ID

http://doi.org/ 10.5281/zenodo.185874

DOI

http://doi.org/10.5281/zenodo.5697604

persistent identifier

http://treatment.plazi.org/id/03C18798-3159-897A-E6C8-3E39FB3DFF6B

treatment provided by

Plazi

scientific name

Pseudoalliphis
status

gen. nov.

Pseudoalliphis   gen. nov.

( Figs 1, 2 View FIGURES 1 – 2 , 13, 14, 18, 23 View FIGURES 11 – 24 )

Type species Alliphis sculpturatus Karg, 1963   .

Description (female). Dorsal idiosoma. Idiosoma dorso-ventrally flattened. Dorsal shield entire, suboval, completely covering dorsal idiosoma, posterior end overlapping slightly onto ventral idiosoma; anterior extension of the shield overlapping onto ventral surface beyond vertex, fused to anterior parts of peritrematal shields to form an arched structure bearing shortened setae j 1 and z 1. Dorsum with coarse punctate-reticulate sculpture, bearing 28 pairs of subequal setae. Vertical setae j 1 thickened and pointed apically, z 1 fine and pointed, j 1 and z 1 positioned on ventral extension of dorsal shield, conspicuously shorter than setae on dorsum.

Ve nt r al idiosoma. Sternal shield well sclerotised, bearing three pairs of setae and two pairs of pores; first pair of sternal pores small, slit-like, oriented at approximately 45 ° to longitudinal axis. Sternal shield and endopodal platelets II almost separated. Endopodal platelets III anteriorly connected with endopodals II. Metasternal platelets absent, metasternal setae st 4 inserted on soft cuticle, adjacent metasternal pores inserted on microplatelets. Genital shield slightly constricted medially, with a pair of posterior genital setae; genital pores inserted on soft cuticle. Anal shield subtriangular. Presternal, exopodal and postgenital plates absent. Peritrematal shields well developed, widened. Metapodal platelets present.

Gnathosoma   . Palptarsus without paired macroeupathidium, tarsal apotele two-tined. Movable digit of chelicerae bidentate. Tectum with elongated central projection and short, simple lateral prongs.

Legs. Setation of legs I-II-III-IV: coxae 2 - 2 - 2 - 1, trochanters 6 - 5 - 5 - 5, femora 13 - 11 - 6 - 6, genua 11 - 11 - 8 - 7, tibiae 11 - 10 - 7 - 7; tarsi II–IV with 18 setae.

Etymology. The genus name Pseudoalliphis   refers to the similarity of the new genus to the related genus Alliphis   .

Notes on the genus. The new genus is characterised by an exceptional combination of characters that occur in several eviphidid genera, including Crassicheles   , Rafaphis   and Halolaspis   gen. nov. (endopodal platelets II and sternal shield separated), Alloseius   gen. nov. (ventral position of dorsal shield setae j 1 and z 1; fusion of anterior sections of peritrematal shields and dorsal shield to form an arched ventral shield structure; coarse punctate-reticulate dorsal ornamentation), Rafaphis   (ventral expansion of posterior dorsal shield), Canestriniphis   , Cryptoseius   , Scarabaspis   and Halolaspis   (absence of metasternal platelets). We consider the new genus Pseudoalliphis   to represent a connecting link between unspecialised edaphic genera such as Rafaphis   and Halolaspis   through Alloseius   towards the genera with phoretic species specialised for life in temporary and spatially limited habitats. The genus Pseudoalliphis   is presently monotypic.

The genera Pseudoallphis and Alliphis   may be distinguished from one another by a number of characters. In Pseudoalliphis   , (1) the anterior sections of the peritrematal shields are extensively fused with each other and with the dorsal shield; (2) the fusion of the peritrematal shields with the expanded anterior margin of the dorsal shield forms an arch-shaped antero-ventral shield structure that embraces coxae I ( Fig. 2 View FIGURES 1 – 2 ); (3) the dorsal shield is expanded ventrally around the vertex so that dorsal shield setae j 1 and z 1 setae are inserted on the ventral surface ( Fig. 2 View FIGURES 1 – 2 ); (4) the endopodal plates between coxae II and III are almost free from the sternal shield; (5) the posterior margin of the dorsal shield is slightly expanded so that a narrow strip of the shield is visible ventrally; (6) the exopodal platelets are absent. In Alliphis   , (1) the anterior sections of the peritrematal shields are not fused with each other, and are fused with the dorsal shield only in the anterolateral areas; (2) there is no arch-shaped antero-ventral shield structure around coxae I ( Fig. 4 View FIGURES 3 – 4 ); (3) setae j 1 and z 1 are inserted in their normal positions at the anterior end of the dorsal shield ( Fig. 3 View FIGURES 3 – 4 ); (4) endopodal platelets II are completely fused to the sternal shield; (5) the posterior margin of the dorsal shield is not expanded ventrally; (6) exopodal platelets are present ( Fig. 4 View FIGURES 3 – 4 ). Also, the tectum of P. sculpturatus   has smooth simple lateral prongs ( Fig. 18 View FIGURES 11 – 24 ), quite different from those of a typical species of Alliphis   , such as A. halleri   ( Fig. 17 View FIGURES 11 – 24 ).