Paratrombium rovniense, Konikiewicz, Marta & Mąkol, Joanna, 2014

Konikiewicz, Marta & Mąkol, Joanna, 2014, A fossil Paratrombiinae mite (Actinotrichida: Trombidioidea) from the Rovno amber, Ukraine, Zootaxa 3847 (4), pp. 583-589 : 584-588

Paratrombium rovniense sp. nov.

Diagnosis. Larva. Medial and lateral coxala (1a and 1b) on coxa I pectinate.

Description. Larva ( Figs. 1–5 ). Gnathosoma. [Hypostomala not visible]. Chelicera markedly elongated, terminated with long and straight cheliceral claw. Pedipalp setation formula, ƒP ρ = 0–N–0–NNN2–NNNζζζ (ω not detected), comprises one smooth seta on palp femur, three smooth setae on palp tibia and six setae on tarsus (including three ζ and among them—the sickle-shaped ζ). Palp tibial claw (odontus) bifid on entire length, with slightly diverging terminations. Normal setae on palp tarsus smooth, more slender and shorter than eupathidia (ζ). Idiosoma [dorsal view unintelligible due to the structure of the amber piece]. Scutum large, with rounded anterolateral margins; weaker sclerotisation of anterior part of scutum reflected by folds (not striation) of cuticle. [Intercoxalae III not visible]. Pygosomal setae (h1 and h2) placed on protruded bases and setulated along stem.

Setae h1 distinctly longer than h2. Claparède’s organs between coxae I and II. ƒCx = BB–BB–B. Medial and lateral coxala I pectinate, each with 16–20 digitations.

Legs (trochanter–tarsus). I: Tr (1n) – Fe (?4n) – Ge (4n, 2σ, 1κ) – Ti (5n, 2φ) – Ta (15n, 1ω,?2ζ); II: Tr (1n) – Fe (?3n) – Ge (3n, 1σ) – Ti (5n, 2φ) – Ta (13n, 1ω); III: Tr (1n) – Fe (4n) – Ge (3n, 1σ) – Ti (5n) – Ta (12n). Tarsi I–III terminated with paired claws and claw-like empodium; latter extended beyond claws. Normal setae on legs covered with short setulae. Microseta (κ) detected only on genu I (other microsetae as well as famuli on tarsi I and II not seen, presumably due to condition of specimen).

Measurements given in Table 1 . The actual length and length ratio between the leg segments may be skewed due to the spatial position of the embedded specimen.

Deutonymph and adult. Not known.

Etymology. The specific epithet refers to the place of origin of the first parasitengone species described from the Rovno amber.

Type material. The holotype (K-8284-A) contained in a lump of Ukrainian amber, originating from the “Pugach” mine in Klesov, is deposited in the collection of the Schmalhausen Institute of Zoology NAS, Kiev, Ukraine.

Figures

FIGURE 1. Paratrombium rovniense sp. nov. embedded in resin. Not to scale.

FIGURE 2 – 4. Paratrombium rovniense sp. nov. (larva): 2. Ventral aspect of the body; 3. Palp (trochanter – tarsus); 4. Coxa I with pectinate setae.

FIGURE 5. Paratrombium rovniense sp. nov. (larva): Legs I – III (trochanter – tarsus).

Tables

TABLE 1. Metric data on larva of Paratrombium rovniense sp. nov.

Character	Character value Character	Character value Character	Character value
L	262 Ti_I	58 LEG II	302
W	189 Ta_I	60 Cx_III	58
L/W	1.38 LEG I	239 Tr_III	50
AA	57 Cx_II	66 Fe_III	58
AM	27 Tr_II	43 Ge_III	41
Cx_I	77 Fe_II	49 Ti_III	70
Tr_I	35 Ge_II	35 Ta_III	86
Fe_I	36 Ti_II	50 LEG III	363
Ge_I	33 Ta_II	59 IP	904