Jedediella horneri, Kontschán & Starý, 2012

Kontschán, Jenő & Starý, Josef, 2012, New Uropodina (Acari: Mesostigmata) from California, USA, Zootaxa 3210, pp. 26-38: 27-34

publication ID

http://doi.org/ 10.5281/zenodo.280198

publication LSID

lsid:zoobank.org:pub:193D9CC3-15F0-46E0-9715-AD698B1E93D4

DOI

http://doi.org/10.5281/zenodo.5629697

persistent identifier

http://treatment.plazi.org/id/03DD521F-9D18-0A38-FF53-FA2C4FC2ADDD

treatment provided by

Plazi

scientific name

Jedediella horneri
status

sp. nov.

Jedediella horneri   sp. nov.

( Figs 1–14 View FIGURES 1 – 5 View FIGURES 6 – 12 View FIGURES 13 – 14 )

Material examined. Holotype. Female ( HNHM, in alcohol), USA, California, Del Norte County, Jedediah Smith State Park, 1 April 1992, 41o 50 ’ N, 124 o W, coniferous forest, under Tsuga heterophylla (Raf.) Sarg.   , sample of litter and soil, K. Horner coll. Paratypes. Four males and one female; same data as holotype. One male paratype in ISB, one male in MHNG and two males in HNHM in alcohol, one female paratype on slide in HNHM.

Description. Female. Length of idiosoma 880–890 µm, width 660–670 µm (n= 2). Shape oval, idiosoma dorsally domed and strongly sclerotised.

Dorsal idiosoma ( Fig. 1 View FIGURES 1 – 5 ). Dorsal and marginal shields completely separated, all dorsal setae short (ca. 28–35 µm), smooth and needle-like. Caudal area of dorsal shield bearing a marginally strongly sclerotised, large depression. Setae on margins of depression as long as dorsal setae, but more robust. Caudal margin of dorsal shield undulate, other parts smooth. Dorsal shield without ornamentation. Marginal shield bearing smooth and needle-like setae (ca. 20–22 µm), surface strongly sclerotised near marginal setae, inner margin undulate.

Ventral idiosoma ( Fig. 2 View FIGURES 1 – 5 ). Surface of sternal shield mostly smooth, some shallow irregular pits near anterior margin of genital shield. Five pairs of smooth and needle-like sternal setae present, St 1 (ca. 7 µm) placed near anterior margin of sternal shield, St 2 (ca. 7 µm) at level of central area of coxae II, St 3 (ca. 12 µm) at level of central area of coxae III, St 4 (ca. 28 µm) at level of posterior margin of coxae III, St 5 (ca. 17 µm) at level of posterior margin of coxae IV. Ventral shield without sculptural pattern and bearing smooth and needle-like setae (ca. 28–34 µm), adanal setae similar in shape and length to ventral setae, postanal seta absent ( Fig. 2 View FIGURES 1 – 5 ). Pedofossae deep, their surface smooth, without separate furrows for tarsi IV. Metapodal lines well developed, adjacent setae short and needle-like (ca. 14–17 µm). Genital shield linguiform, anteriorly rounded, its surface covered by oval pits ( Fig. 3 View FIGURES 1 – 5 .). Stigmata situated between coxae II and III, peritremes L-shaped ( Fig. 4 View FIGURES 1 – 5 ). Tritosternum with vase-shaped base, laciniae divided into two smooth lateral branches and one pilose central branch ( Fig. 5 View FIGURES 1 – 5 ).

Gnathosoma   ( Fig. 6 View FIGURES 6 – 12 ). Hypostomal setae h 1 long and pilose (ca. 92 µm), h 2 short (ca. 30 µm) and smooth, h 3 (ca. 38 µm) and h 4 (ca. 20 µm) marginally pilose. Ventral surface of hypostome with small, spine-like structures in deutosternal groove. Palp trochanter with one long, pilose seta and one short smooth seta, other setae on palp smooth. Corniculi short and horn-shaped, internal malae longer than corniculi and marginally pilose. Epistome basally with long and narrow lateral spines, apically pilose ( Fig. 7 View FIGURES 6 – 12 ). Chelicerae long (ca. 170 µm), movable digit as long as fixed digit, movable digit bearing one large apical tooth, fixed digit with apical bulbiform sensory organ. Both digits medially smooth, without teeth, internal sclerotised node absent ( Fig. 8 View FIGURES 6 – 12 ).

Legs. Leg I without ambulacral claws ( Fig. 9 View FIGURES 6 – 12 ), coxa of leg I covered by small, oval pits, most of setae on leg I smooth and needle-like, but several setae robust. Other legs with claws, ( Figs 10–12 View FIGURES 6 – 12 ) without pits, femora of legs I–IV bearing ventral flap-shaped appendages, each segment of legs with smooth and pilose setae.

Male. Length of idiosoma 880–950 µm, width 650–680 µm (n= 4). Shape and dorsal idiosoma as in female.

Ventral idiosoma ( Fig. 13 View FIGURES 13 – 14 ). Surface of sternal shield covered by oval pits, with five pairs of needle-like sternal setae. St 1 (ca. 7 µm) placed near anterior margin of sternal shield, St 2 (ca. 7 µm) at level of posterior margin of coxae II, St 3 (ca. 7 µm) at level of central area of coxae III, St 4 (ca. 26 µm) and St 5 (ca. 27 µm) near lateral margin of genital shield. One pair of rounded depressions situated near St 5. Position and shape of ventral setae and ornamentation of ventral shield as in female. Genital shield circular, without sculptural pattern, situated between coxae IV.

Gnathosoma   ( Fig. 14 View FIGURES 13 – 14 ). Hypostomal setae h 1 long (ca. 104 µm), pilose, h 2 short (ca. 13 µm) and smooth, h 3 (ca. 45–48 µm) and h 4 (ca. 27 µm) long and pilose. Corniculi, internal malae, epistome, palp and chelicerae as in female.

Etymology. We dedicate the new species in honor to Dr. K. Horner, who collected these specimens in California.

Notes. Hirschmann & Zirngiebl-Nicol (1969 a) described an unusual uropodine mite from North-America, which was placed into the genus Discourella   ( D. sellnicki Hirschmann & Zirngiebl-Nicol, 1969   ). Later, when Hirschmann (1972) created a new subgeneric classification for Discourella   , he placed this species into the Discourella caputmedusae   -group on the basis of the large depression of the caudal area of dorsal shield. Hirschmann (1993) was not sure about the exact systematic position of the species; hence in his monograph this species was discussed separated from other Discourella   species, similar to the species D. venusta ( Berlese, 1884)   (see Kontschán, 2011).

Discourella sellnicki   differs strongly from the other two species in this group on the basis of several characters [ D. caputmedusae ( Berlese & Leonardi, 1901)   and D. caputmedusaesimilis Hirschmann, 1972   ] and it appears that D. sellnicki   is more closely related to our new species. Hence we transfer this species into the new genus as Jedediella sellnicki (Hirschmann & Zirngiebl-Nicol, 1969)   comb. nov. Differences between the genera Jedediella   and Discourella   are summarised in Table 2. and differences between the species of Jedediella   and those of the Discourella caputmedusae   -group are presented in Table 3 View TABLE 3 . According to our interpretation, species of the Discourella caputmedusae   -group, placed in Comydinychus Berlese, 1917   in Hirschmann (1979), do not belong to the genus Discourella   (this is a separate genus, which was described by Berlese (1917) earlier as Comydinychus Berlese, 1917   ), because the two species differ from other Discourella   species by several characters. However, a revised placement of these two species is a topic for a future study.

Jedediella   Discourella  

Pygidial shield absent present

Marginal shield entire divided into small or large plates Chelicerae fixed digit as long as movable digit fixed digit longer than movable digit Peritreme L-shaped straight or U-shaped

Internal malae long and setiform long or short, wide and belt-shaped Material examined. Holotype. Female ( HNHM, in alcohol), USA, California, Del Norte County, Jedediah Smith State Park, 1 April 1992, 41o 50 ’ N, 124 o W, coniferous forest, under Tsuga heterophylla   , sample of litter and soil, K. Horner coll. Paratypes. One female on slide ( HNHM); same data as for holotype.

Description. Female. Length of idiosoma 600–610 µ m, width 410–420 µ m (n= 2). Idiosoma pear-shaped.

Dorsal idiosoma ( Fig. 15 View FIGURES 15 – 20 ). Vertex without wide and ribbed lateral section. Marginal and dorsal shields fused anteriorly. Pygidial shield wide and oval, placed between posterior margin of dorsal shield and anterior margin of postdorsal shield. All setae on dorsal, marginal, and postdorsal shields smooth, robust and ca. 33–42 μm long. Surface of dorsal idiosoma covered by large, oval pits.

Ventral idiosoma ( Fig. 16 View FIGURES 15 – 20 ). Sternal setae short, smooth, and needle-like. St 1 situated near the anterior margin of sternal shield, St 2 and St 3 near anterior margin of genital shield, their length ca. 5–6 μm. St 4 ca. 6 μm long, placed at level of central area of coxae III, St 5 ca. 7 μm long, situated on adgenital platelets, St 6 placed near basal margin of genital shield, ca. 7 μm long. Sternal shield anterior to genital shield without ornamentation, but bearing a strongly sclerotised π-shaped line near its anterior margin. Several oval pits situated posterior to genital shield. Ventral and inguinal shields not fused laterally, covered by oval pits, bearing long (ca. 36–40 μm) needle-like setae. Setae X 4 (ca. 44–45 μm) situated on small platelets in membranous cuticle. First pair of adanal setae present, short (ca. 9–10 μm), second pair of adanal setae absent, postanal seta robust, ca. 20 μm long. Genital shield axe-shaped, wider basally than apically (2.5: 1), very narrow at level of St 4. Anterior margin of genital shield straight, its surface covered by oval pits on basal area. Adgenital platelets present. Genital shield situated between coxae III and IV ( Fig. 17 View FIGURES 15 – 20 ). Peritremes long and straight, situated near coxae III. Tritosternum ( Fig. 18 View FIGURES 15 – 20 ) with wide base, tritosternal laciniae divided into three branches.

Gnathosoma   ( Fig. 18 View FIGURES 15 – 20 ). Corniculi horn-shaped, internal malae longer than corniculi, smooth. Hypostomal setae h 1 long (ca. 48 μm) and smooth, h 2 short (ca. 21 μm) and smooth, h 3 similar in shape to h 1, ca. 40 μm long, h 4 marginally serrate and ca. 11 μm long. Chelicerae with long sharp apical process on fixed digit, two lateral sensory organs situated on fixed digit, movable digit shorter than fixed digit and bearing one tooth. Epistome marginally serrate ( Fig. 19 View FIGURES 15 – 20 ). Palps with smooth setae ( Fig. 21 View FIGURES 21 – 25 ).

Legs. Leg I with small ambulacral claws ( Fig. 22 View FIGURES 21 – 25 ), surface of legs I and II covered by small oval pits, setae on leg I smooth and needle-like, other legs bearing smooth and marginally serrate setae ( Figs 23–25 View FIGURES 21 – 25 ).

Etymology. The name of the new species refers to the shape of the female genital shield.

Notes. Only one Trachytes   species has a similar axe-shaped genital shield in the female and lacks wide and ribbed lateral sections on the vertex – the European species, T. welbourni Moraza, 1989   . In T. welbourni   , however, the inguinal and sternal shields are fused, whereas in these shields are separated from each other in the new species.

TABLE 3. Character states that distinguish between Jedediella and Discourella caputmedusae - group species.

  J. horneri   J. sellnicki   D. caputmedusae   D. caputmedusaesimilis  
Dorsal shield separated from marginal shield separated from marginal shield anteriorly fused with marginal shield anteriorly fused with marginal shield
Dorsal setae short short long long
Marginal setae short and smooth short and smooth long and serrate long and serrate
Peritreme L-shaped L-shaped U-shaped U-shaped
Adanal setae as long as ventral setae as long as ventral setae one third as long as ventral setae one third as long as ventral setae
Surface of genital shield in female covered by oval pits covered by oval pits unknown smooth
Apical process on genital shield in female absent present absent absent
First pair of ventral setae in male as long as second pair of ventral setae as long as second pair of ventral seta as long as second pair of ventral seta half as long as second pair of ventral setae
Surface of sternal shield in male with several oval pits anterior to genital shied with several oval pits anterior to genital shied smooth smooth
Rounded depression on ster- nal shield in male present absent absent absent
Trachytes axe   sp. nov. (Figs 15–25)        
HNHM

Hungarian Natural History Museum (Termeszettudomanyi Muzeum)

ISB

Institute of Spelology Emile Racovita

MHNG

Museum d'Histoire Naturelle

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Mesostigmata

Family

Uropodidae

Genus

Jedediella

Loc

Jedediella horneri

Kontschán, Jenő & Starý, Josef 2012
2012
Loc

Jedediella

Kontschán & Starý 2012
2012
Loc

Jedediella

Kontschán & Starý 2012
2012
Loc

Jedediella

Kontschán & Starý 2012
2012
Loc

Jedediella

Kontschán & Starý 2012
2012
Loc

D. caputmedusaesimilis

Hirschmann 1972
1972
Loc

Jedediella sellnicki

Hirschmann & Zirngiebl-Nicol 1969
1969
Loc

Comydinychus

Berlese 1917
1917
Loc

Comydinychus

Berlese 1917
1917
Loc

D. caputmedusae (

Berlese & Leonardi 1901
1901