Daidalotarsonemus tessellatus De Leon, 1956

Rezende, José Marcos, Bauchan, Gary, Lin, Jian-Zhen, Ochoa, Ronald & Lofego, Antonio Carlos, 2024, Review of the genus Daidalotarsonemus De Leon (Acari: Prostigmata: Tarsonemidae), Zootaxa 5426 (1), pp. 1-170 : 137-145

Daidalotarsonemus tessellatus De Leon, 1956

( Figs. 118–124 )

Daidalotarsonemus tessellatus De Leon, 1956: 163 ; Smiley, 1972: 91; Lindquist, 1986: 316; Lin & Zhang, 2002: 64.

Senior synonym of Daidalotarsonemus venustus, Attiah, 1970: 191 ; Smiley, 1972: 94; Lindquist, 1986: 320; Lin & Zhang, 2002: 65.

Diagnosis. Adults: Gnathosoma : Palpal length about 1/3 length of gnathosoma. Female: Dorsum: Prodorsum with coarse ornamentation and reticulation posteriorly. Tergite C with four transverse rows of well-defined cells grouped between setae c1. Tergite D with reticulate ornamentation. Setae v1, sc2, c1, c2 and h unmodified in shape. Setae v1 shorter than sc2 (~ 23 and ~32, respectively). Setae c1 slightly longer than c2 (~ 22 and ~20, respectively). Setae c1 inserted near midlength of tergite C. Setae d, e and f leaf-shaped. Setae d and f similar in shape (ensiform), length (~ 33) and width (~ 6). Setae e elliptical in shape, length (~ 17) and width (~ 10). Setae f ~13 distant from each other, on rounded tubercles. Venter: Tegula truncate, slightly arched posteriorly.All apodemes distinct. Apodemes 2 not fused to prosternal apodeme. Poststernal apodeme bifurcated anteriorly. Legs: sensory cluster of tibiotarsus I complete. Seta tc” of tarsus II smooth. Male: Dorsum: Setae v1 longer than sc2 (~ 25 and ~ 18, respectively), both longer than v2 (~ 15). Setae c1 slightly longer than c2 (~ 29 and ~ 26, respectively) both shorter than d (~ 35). Setae f about as long as d (~ 34). Venter: Apodemes 5 distinct at posterior end of poststernal apodeme. Legs: Sensory cluster of tibiotarsus I incomplete (maybe due to poor slide condition). Solenidion ω of tarsus II length 4. On femorogenu IV, seta v’ G around four times longer than v’ F (~ 31 and ~ 8, respectively). On tibia IV, seta v’ Ti around three times longer tibia IV itself (~ 22 and ~ 86, respectively). Larva: unknown.

Redescription:

Female:

Gnathosoma : ovate in ventral view, length 36, maximum width 24. Setae dgs 19 and vgs 9 smooth; palps length 20, with two small subterminal setae and terminal projections. Pharynx length 15, maximum width 7.

Idiosoma—dorsum: length 215, width at level of c1 125. Prodorsal shield with coarse ornamentation and reticulation on central and posterior areas. Tergite C and D reticulate medially. Lengths of setae: v1 23, sc2 32, c1 22, c2 20, d 33, e 17, f 34 and h 15. Maximum widths of expanded setae: d 6, e 10 and f 6. Setae v1, sc2, c1 and c2 unmodified; d and f ensiform; e elliptical with two veins. All inserted on tubercles, except for h. Distances between dorsal setae: v1–v1 36, sc2–sc 2 60, v1–sc2 27, c1–c1 52, c2–c2 114, c1–c2 38, d–d 37, f–f 13, e–f 16 and h–h 20.

Idiosoma—venter: setae 1a 7; 2a 12; 3a 6 near anteromedial margins of apodemes 3; 3b 7 on posterior ends of apodemes 4. Apodeme 1 conspicuous from anterior end of prosternal apodeme, interrupted at level of apodemes 2. Apodeme 2 short and not fused to prosternal apodeme. Prosternal apodeme conspicuous from junction with apodeme 1 to sejugal apodeme. Sejugal apodeme uninterrupted.Apodeme 3 extending diagonally from proximity of base of seta 3a to anterior margin of trochanter III; apodeme 4 extending diagonally from midlength of poststernal apodeme to base of seta 3b. Poststernal apodeme bifurcated anteriorly. Tegula 14 wide and 4 long; posterior margin slightly arched. Setae ps 17 smooth.

Legs: Lengths: leg I 55, leg II 46, leg III 93. Number of setae: leg I: 3-4-5(2)+7(1), leg II: 3-3-4-4(1), leg III: 1+3-4-4. Tarsal solenidion ω of tibiotarsus I 5. Sensory cluster of tibiotarsus I complete, solenidion φ1 3, slender, capitate; solenidion φ2 4, robust, slightly capitate; famulus k 6; all inserted at approximately same level. Seta d of tibiotarsus I 37 serrate. Solenidion ω of tarsus II length 5. Seta d of tibia II 26 serrate. Femorogenu IV 23; tibiotarsus IV 12. Length of leg IV setae: v’ F 7, v’ G 17, v’ Ti 25 and tc” 40; all setae smooth, except for v’ G and v’ Ti; v’ Ti tapered.

Male:

Gnathosoma : length 32, maximum width 27. Setae dgs 14 and vgs 8, both smooth; Palps length 14, with two small subterminal setae and terminal projections. Pharynx length 14, maximum width 8.

Idiosoma—dorsum: length 160, width at level of c1 95. Length of dorsal setae: v1 25, v2 15, sc1 45, sc2 18, c1 29, c2 26, d 35, f 34. All setae slender and serrate, except for c2 smooth. Distances between dorsal setae: v1–v1 14, sc1–sc1 31, sc2–sc2 45, v1–sc2 27, c1–c1 84, c2–c2 91, c1–c2 50, d–d 47, f–f 16. Seta sc2 laterad and slightly posterior to sc1.

Idiosoma—venter: setae 1a 6; 2a 7; 3a 12 near anterior end of apodemes 3; 3b 13. Apodeme 1 fused to anterior end of prosternal apodeme. Apodeme 2 not fused to prosternal apodeme. Prosternal conspicuous from junction with apodeme 1 to level of apodemes 2, and inconspicuous from that point to sejugal apodeme. Connecting lines between apodemes 3, 4 and poststernal apodeme diffuse.

Legs: Lengths: leg I 66, leg II 69, leg III 82, leg IV 104. Number of setae: leg I: 3-4-5(?)-6(1), leg II: 3-3-3- 4(1), leg III: 1-3-4-2. Solenidion ω of tarsus I 4. Solenidion φ1 4, φ2 not visible, and famulus k 4, both inserted at approximately same level. Seta d of tibia I 18 serrate. Solenidion ω of tarsus II length 4. Seta d of tibia II 20 serrate. Trochanter IV slightly wider than long, seta v’ 18, serrate. Femorogenu IV length 46 and width 28 at v’ F level, anterior margin convex, posterior margin slightly convex at proximal third. Seta v’ F 8 smooth. Setae v’ G 31 and l” G 13 serrate. Tibia IV 22 long; solenidion φ 8; seta v’ Ti 86, serrate. Tarsus IV short, bearing 3 smooth setae of following length: tc” 7, pv” 6 and u’ 5.

Remarks: after careful examination of types and voucher specimens, we concluded D. venustus is a junior synonym of D. tessellatus . Diagnosis provided by Attiah (1970) mentions arrangement of dorsal posterior setae d, e and f as only character to differentiate these species. It is known that slide mounting usually distorts tarsonemids, changing real position of tergites and their respective setae (Ochoa et al. 1997; Rezende et al. 2018). Therefore, it cannot be used alone as a diagnostic character to define a species. Also, as stated in Rezende et al. (2015c), previous records of D. tessellatus from Brazil ( Feres et al. 2005; Lofego et al. 2005; Buosi et al. 2006; Demite et al. 2009; Sousa et al. 2015) should be referred to as D. savanicus .

Type material deposition: holotype ♀ deposited at USNM; five paratypes ♀ and two paratypes ♂ at FSCA. Holotype ♀ of D. venustus deposited at USNM.

Locality: Previous Records: U.S. Plant Introduction Garden, South Miami, State of Florida , USA; ( De Leon 1956 — type series locality); Hachioji , Tokyo Province , Japan ( Ito 1963); Melbourne, State of Florida , USA ( Attiah 1970).

Figures

FIGURE 118. Dorsal surface of Daidalotarsonemus tessellatus De Leon, 1956 (female).

FIGURE 119. Ventral surface of Daidalotarsonemus tessellatus De Leon, 1956 (female).

FIGURE 120. Legs I (A), II (B), III (C) and IV (D) of Daidalotarsonemus tessellatus De Leon, 1956 (female).

FIGURE 121. Micrographs of dorsum (left) and venter (right) of Daidalotarsonemus tessellatus De Leon, 1956 (female).

FIGURE 122. Dorsal surface of Daidalotarsonemus tessellatus De Leon, 1956 (male).