Limnochares danielei Gerecke & Smit,

Davids, Kees, Sabatino, Antonio Di, Gerecke, Reinhard, Gledhill, Terence & Smit, Harry, 2005, On the taxonomy of water mites (Acari: Hydrachnidia) described from the Palaearctic, part 1: Hydrachnidae, Limnocharidae and Eylaidae, Zootaxa 1061, pp. 36-64: 58-59

publication ID

http://doi.org/ 10.5281/zenodo.170186

publication LSID

lsid:zoobank.org:pub:81B2332D-7AEB-406F-B2FC-6C2A36934B52

persistent identifier

http://treatment.plazi.org/id/03F7DE69-B05C-FFF2-FEF6-FD9FFDE48313

treatment provided by

Plazi

scientific name

Limnochares danielei Gerecke & Smit
status

sp. nov.

Limnochares danielei Gerecke & Smit  , sp. nov.

Type series: Holotype male, Cyprus, South of Prodromos, unnamed creek at crossing with road E 804, 22.04. 2002 leg. H. Smit, slide mounted together with a paratype male in Hoyers medium ( ZMAN); paratypes (same site and date): one male, slide mounted together with the holotype, one male, two females, slide mounted in Hoyers medium; three males, five females undissected, in Koenikes fluid ( ZMAN).

Diagnosis: Idiosoma L 1500–2000, dorsum bearing five pairs of rod­shaped sclerites and, in the posterior part, one unpaired transverse or triangular sclerite; frontal shield short and robust (L/H ratio 1.9–2.1); Cx­ 1 + 2 ( Fig. 3View FIGURE 3. A E) enlarged (L/ W 1.3 –1.6), anterolateral edge with a digitiform, densely setose extension, coxal setae rather long; genital field ( Fig. 3View FIGURE 3. A F) with 33–44 pairs of acetabula; genital setae in both sexes not arranged in groups; excretory pore surrounded by a sclerotized ring; palp ( Fig. 2View FIGURE 2. A – F G) five­segmented with a relatively long P­ 4 (L 25, L ratio P­ 2 /P­ 4 in females 1.8, in males 2.2).

Description: General morphology as in L. azubi  , but all specimens with a sclerotized ring surrounding the excretory pore (if no details are given, morphology as described for L. azubi  ).

Males (n = 2): Idiosoma L 1600; frontal sclerite L/W 250–290 / 135–140; anterodorsal sclerites L 120–150, 190 – 200; posterodorsal sclerite diameter 60–100; Cx­ 1 maximum L/ anterior margin W 290 / 180–190 (1.5–1.6); Cx­ 3 / 4 maximum L/anterior W (excluding the subcutaneous apodemes) 370–385 / 190–195 (2.0); leg IV measurements (L/H) of one paratype: IV­L­ 4 175 / 55 (3.2), IV­L­ 5 200 / 55 (3.6), IV­L­ 6 190 / 50 (3.8); Ac number 70–78, genital setae number 22–26; gnathosoma L 210–240, H 130, W 165, mouth disc diameter 55–60; chelicera basal segment L/H 210 / 45, claw L 32 (L/H ratio 5.4, basal segment/claw L ratio 6.6); palp segments L/H P­ 1 10 / 25, P­ 2 55 / 40, P­ 3 40 / 35, P­ 4 25 / 25, P­ 5 25 / 9, total L 155.

Females (n = 2): Idiosoma L 1500–2000; frontal sclerite L/W 300–310 / 150–160; anterodorsal sclerites L 115–185, 105 – 165; Cx­ 1 maximum L/anterior margin W 310–335 / 205–230 (1.5); Cx­ 3 / 4 maximum L/anterior W (excluding the subcutaneous apodemes) 400–460 / 205–230 (2.0); leg IV measurements (L/H) of one paratype: IV­L­ 4 200 / 70 (2.9), IV­L­ 5 230 / 60 (3.8), IV­L­ 6 220 / 60 (3.7); Ac number 87–89, genital setae number 19–24; gnathosoma L 250–275, H 140, W 170, mouth disc diameter 65; chelicera basal segment L 250, claw L 35 (basal segment/claw L ratio 7.2); palp segments L/H P­ 1 12 / 27, P­ 2 62 / 42, P­ 3 48 / 37, P­ 4 35 / 26, P­ 5 27 / 10, total L 184.

Deutonymph: Unknown.

Dervivatio nominis: Named after our friend and colleague Daniele Benfatti (1957–2004).

Discussion: This species is obviously closely related to L. azubi  . Common characters that separate both species from L. aquatica  are the shape and arrangement of the dorsal sclerites, the presence of a setose anterior extension of Cx­ 1, and the relatively low number of acetabula. Limnochares danielei  differs from L. azubi  in the relatively enlarged anterior coxal plates (L/W <1.7, in L. azubi  1.7–2.1) with longer setae, and a longer, more inflated P­ 4 (L 25–35, in L. azubi  14–20). Furthermore, all specimens have the excretory pore surrounded by a sclerotized ring, while in L. azubi  a structure of this type was found only in one exceptional case, presumably a specimen that had undergone an additional adult moult ­ this specimen differs in having a very high number of 155 acetabula whereas all other specimens of both L. azubi  and L. danielei  have fewer (<100). Limnochares danielei  , like L. azubi  , differs from the American species, L. anomala  , in the presence of a setose projection on Cx­ 1.

ZMAN

Instituut voor Taxonomische Zoologie, Zoologisch Museum