Crossdania, Khaustov & Whitaker, 2019
publication ID |
https://doi.org/ 10.24349/acarologia/20194335 |
publication LSID |
lsid:zoobank.org:pub:4CC238AE-261B-432A-901D-490635B60695 |
persistent identifier |
https://treatment.plazi.org/id/BC02375D-4CFF-4338-8DE7-12E55D2D3203 |
taxon LSID |
lsid:zoobank.org:act:BC02375D-4CFF-4338-8DE7-12E55D2D3203 |
treatment provided by |
Carolina |
scientific name |
Crossdania |
status |
gen. nov. |
Genus Crossdania gen. nov.
Zoobank: BC02375D-4CFF-4338-8DE7-12E55D2D3203
Type species: Crossdania tubulosa sp. nov.
Diagnosis — Female. Body oval. Gnathosomal capsule slightly elongate, its length
slightly longer than width, dorsally with two pairs of cheliceral setae cha (, chb); postpalpal
setae not evident; palps prominent, with two pairs of dorsolateral setae dFe (, dGe), tiny distal
seta-like structure and distinct tibial claw distally. Subcapitulum with one pair of setae m;
palps ventrally with accessory setigenous structure (ass) and small solenidion sol (). Pharyngeal
pumps tripartite, connected to each other. Prodorsum and tergite C separated by soft cuticle.
Prodorsum with two pairs of setae v (2, sc 2), pair of clavate trichobothria sc (1) and small, round
stigmata located just anteriorly to setae v 2. Dorsal hysterosomal setae not modified, except
wide and flat v 2. Tergite C with two pairs of setae c (1, c 2); tergite D with one pair of setae d ()
and pair of round cupules ia; tergite EF with two pairs of setae e (, f); tergite H with two pairs
of setae (h 1, h 2) and pair of round cupules ih. A pair of tube-like sclerotized structures located
under tergite H ( Fig. 5C View Figure 5 ). Coxal fields I with two pairs of setae a (, 1 1 b); coxal fields II with two
pairs of setae (2 a, 2 b); coxal fields III with three pairs of setae (3 a, 3 b, 3 c); coxal fields IV with
three pairs of setae (4 a, 4 b, 4 c). Pseudanal segment with three pairs of setae ps (1-3). Apodemes
1 (ap1) and apodemes 2 (ap2) well developed and joined with prosternal apodeme (appr),
sejugal apodeme (apsej) well developed and joined with appr; apodemes 3 (ap3) weak, diffuse,
apodemes 4 (ap4) long, reaching beyond bases of setae b. 3 Apodemes 5 (ap5) short, located
near the bases of trochanters IV. Secondary transverse apodeme absent. Coxal fields I separated
from coxal fields II by slightly curved and almost connected medially lines. Posterior margin
of posterior sternal plate entire, slightly convex in middle part. Anterior genital sclerite (ags)
small, cup-shaped, posterior genital sclerite (pgs) small, triangular. Median genital sclerite
absent. Ventral idiosomal setae not modified. Legs I slightly shorter than legs II. Tibiotarsus I
cylindrical, with slightly thickened claw situated on short pretarsus; seta d of femur I hook-like,
seta k short, blunt-ended, eupathidium-like. Claws on tarsi II and III thickened basally (padded).
Claws on pretarsus IV absent. Femora III–IV divided into basi- and telofemur. Setae l” of
genu, d of tibia, pl”, tc’, and (pv) of tarsus of leg II, pl”, (pv) of tarsus III and u’ of tarsus IV
modified, thickened and usually with “crown” of hooked barbs ( Fig. 5F View Figure 5 ). Empodia on tarsi II
and III distinctly elongate; empodium on tarsus IV very long and narrow. An unpaired slightly
thickened seta-like structure (modified unguinal seta u) located near the base of pretarsal claw.
Leg setation: leg I; Tr 1 v’ (), Fe 3 (d, l’, v”), Ge 4 (l’, l”, v’, v”), TiTa 17(4) (d, l’, l”, v’, v”, k,
tc’, tc”, p”, ft’, ft”, pv’, pv”, pl’, pl”, s, u, ω 1, ω 2, φ 1, φ 2); leg II: Tr 1 (v’), fe 3 (d, l’, v”), Ge 3
(l’, l”, v’), Ti 4(1) (d, l’, v’, v”, φ), Ta 6(1) (tc’, tc”, pl”, pv’, pv”, u’, ω); leg III: Tr 1 (v’), Fe 2
(d, v’), Ge 2 (l’, v’), Ti 4(1) (d, l’, v’, v”, φ), Ta 6 (tc’, tc”, pl”, pv’, pv”, u’); leg IV: Tr 1 (v’), F
2 (d, v’), Ge 1 (v’), Ti 4(1) (d, l’, v’, v”, φ), Ta 6 (tc’, tc”, pl”, u’, pv’, pv”).
Differential diagnosis — The new genus is most similar to Protobakerdania Khaustov
and Minor, 2018 by the absence of a median genital sclerite, hook-like setae d of femur I,
the same leg setation, and entire posterior margin of the posterior sternal plate. The new
genus differs from Protobakerdania by the long and narrow empodia on tarsi II and III and
very long empodium on tarsus IV (vs not elongate, flipper-like in Protobakerdania ), by the characteristically modified setae l” of genu, d of tibia, pl”, tc”, and (pv) of tarsus of leg II
(vs. not modified in Protobakerdania ). From all known genera of Neopygmephoridae the new genus differs by the presence of sclerotized tube-like structures under tergite H (vs absent in all other genera) and by the absence of claws on tarsus IV (vs present in all other genera).
Species included — The genus Crossdania includes only one species, Crossdania tubulosa
sp. nov.
Distribution and habitats — Crossdania tubulosa sp. nov. was collected on the Northern grasshopper mouse, Onychomys leucogaster ( Rodentia : Cricetidae ) and Great Basin pocket mouse, Perognathus parvus ( Rodentia : Heteromyidae ) in USA.
Etymology — The generic name is a combination of two words: Cross, the family
name of late American acarologist Earl Cross, and dania, the common ending of many Neopygmephorid genera. The new genus is named after Earl Cross for his contributions in the study of heterostigmatic mites.
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