Otocepheus (Acrotocepheus) multigranulatus, Zheng & Chen, 2020

Zheng, Li-Hao & Chen, Jun, 2020, Three new species of the subgenus Otocepheus (Acrotocepheus) (Acari, Oribatida, Otocepheidae) from China, ZooKeys 934, pp. 1-23 : 1

Otocepheus (Acrotocepheus) multigranulatus sp. nov. Figs 8-12 , 13-15 , 16-18 , 19-22

Diagnosis.

Body size (n = 3): 1150-1240 × 530-609. Bothridial setae with a fusiform head. Lateral notogastral condyles wide, like staircase with two to three layers mainly. An extra pair of condyles (cex) located posterior to lateral prodorsal condyles, covered by lateral notogastral condyles. Bothridial seta with a fusiform head. Body surface densely granulate.

Description.

Measurements. Body length: 1240 (holotype: female), 1150-1230 (two paratypes: all males); notogaster width: 609 (holotype), 530-600 (paratypes). Setae length and mutual distance (holotype): bs 160, in 200, le 210, ro 160, ex 35; c, la, lm, lp, h 1, h 2, h 3, p 1, p 2, p 3 range 170-200; c - c 199, la - la 290, lm - lm 240, lp - lp 390, h 2- h 2 260, h 1- h 1 240.

Integument. Body color light yellow-brownish. Body surface densely granulate.

Prodorsum. Rostrum rounded. Rostral seta moderately curved inward, densely barbed outside. Lamellar seta inserted behind tip of costula, curved inward, roughened outside. Interlamellar seta barbed, setiform. Bothridial seta with a fusiform head. Exobothridial seta short. Bothridium opening laterally, dorsal bothridial plate straight, ventral bothridial plate broadly rounded in dorsal view. Tutorium well developed. Two pairs of prodorsal condyles present, lateral prodorsal condyles earlobe-shaped, median prodorsal condyles rounded, well separated from each other. An extra pair of condyles located posterior to lateral prodorsal condyles, covered by lateral notogastral condyles. Mutual distance between ventral bothridial plates larger than that between lateral prodorsal condyles. Subpedotectum well developed.

Notogaster. L/W of notogaster about 1.2. Surface of notogaster densely and obviously granulate. Anterior margin of notogaster straight. The largest width of notogaster medially, near level of seta lp. Lateral notogastral condyles wide, like a lateral view of staircase with two to three steps mainly. Median notogastral condyles absent. Ten pairs of notogastral setae nearly same in length, barbed. A faint, short ridge present lateral to insertion of seta c. Mutual distance between setae p1 lager than that between p1 and p2. Seta lm and lyriffissure im nearly on same line. Five pairs of lyrifissures visible, ip located between setae p 2 and p 3, ips between setae h 3 and p 3. Opisthonotal gland opening located anterior to lyriffissure im. Vitta marginalis well developed, fainted anteriorly.

Epimeral and lateral podosomal regions. Apodemes I, II and sejugal well developed, apodeme III invisible. Carina sterinalis well developed. Epimeral setal formula 3-1-3-3. Seta 4a inserted between 4b and 4c, and closer to 4c. Postpodosomal ornamentation invisible.

Anogenital region. A pair of longitudinal ridges posterior to epimeral seta 4a. Genital plates smooth. Four pairs of genital setae (mutual distances g 1- g 1≈ g 2- g 2<g 4- g 4<g 3- g 3). Aggenital lyrifissure located close and anterolateral to genital aperture. One pair of aggenital, two pairs of anal (mutual distances an 1- an 1<an 2- an 2) and three pairs of adanal setae. Anal and adanal setae barbed like notogastral setae. Setae ad 3- ad 3 below level of anterior margin of anal opening. Adanal lyrifissure situated anterior to level of seta ad 3.

Gnathosoma. Subcapitular setae fistulous, barbed. Adoral setae and their alveoli absent. Rutellum pantelobasic, with typical dentition and rutellar brush. Chelicera chelate-dentate; with a minute denticle proximal to seta cha; cha longer than chb, both of them setiform, barbed; Trägårdh’s organ narrowly triangular. Palp with usual setal formula: 0-2-1-3-8 (+ ω); setae of femur to tibia barbed. Tarsus with four short, blunt distal eupathidia- acm, su, (ul); other tarsal setae smooth or with sparse, inconspicuous barbs; solenidion ω connected with seta ul ', seta ul " medioanteriorly. Postpalpal seta erect, smooth.

Legs. Monodactylous. Claw of each leg strong and smooth. Formulae of leg setation and solenidia: I (1-4-3-4-16) [1-2-2], II (1-4-3-3-15) [1-1-2], III (2-3-1-2-15) [1-1-0], IV (1-2-2-2-12) [0-1-0]. Leg seta u setiform (L-type) on tarsi I, thorn-like (S-type) on tarsi II-IV. Homology of setae and solenidia indicated in Table 1 .

Material examined.

Holotype (female, LD-08-10): China, Hunan Province, Yanling County, Taoyuan Dong, 26°17'42"N, 114°1'15"E, 1065 m a.s.l., in soil and debris under trees, 6 July 2008, collected by Dong Liu. Two paratypes (males, LD-08-49): China, Hunan Province, Guidong County, Xinlong Village, 26°4'29"N, 113°46'53"E, 1525 m a.s.l., in soil and debris under trees, 12 July 2008, collected by Dong Liu.

Type deposition.

All type specimens are deposited in the collection of IZAS.

Etymology.

The specific name " multigranulatus " is from Latin for “granulate” and is in reference to the uneven, granular body surface.

Remarks.

The new species is similar to O. (A.) lienhardorum Mahunka, 2000 from Malaysia, O. (A.) macrodentatus Hammer, 1981 from Java, and O. (A.) holtmanni Aoki, 1965 from New Guinea in having similar shaped lateral notogastral condyles. However, it differs from O. (A.) lienhardorum by the granulate ventral plate (versus foveolate), notogastral setae nearly same in length (versus setae p 1- p 3 and h 3 long), bothridial seta with a fusiform head (versus markedly developed), and seta 1a well visible (versus minute or absent). It differs from O. (A.) macrodentatus by the epimeral setal formula 3-1-3-3 (versus 3-1-2-3), normal seta h 3 (versus much smaller and thinner than the other notogasral setae), surface of notogaster densely, and obviously granulate (versus punctate). It differs from O. (A.) holtmanni by the granulate notogastral surface (versus minutely and densely punctured), lyrifissure ips located between setae h 3 and p 3 (versus anterior to seta h 3), the largest width of notogaster medially, near level of seta lp (versus the largest width rather anteriorly, near level of seta lm), vitta marginalis well developed, faint anteriorly (versus vitta marginalis visible only on anterior half of notogaster).

Figures

Figures 8 - 12. Otocepheus (Acrotocepheus) multigranulatus sp. nov., adult 8 seta ro 9 seta le 10 ventral view (legs not shown) 11 dorsal view 12 bothridial seta. Scale bars: 100 µm (8, 9, 12), 200 µm (10, 11).

Figures 13 - 15. Otocepheus (Acrotocepheus) multigranulatus sp. nov., adult, microscope images 13 dorsal view 14 ventral view 15 lateral view. Scale bars: 200 µm.

Figures 16 - 18. Otocepheus (Acrotocepheus) multigranulatus sp. nov., adult 16 subcapitulum, ventral view 17 right palp (without trochanter), abaxial view 18 right chelicera, adaxial view. Scale bars: 50 μm.

Figures 19 - 22. Otocepheus (Acrotocepheus) multigranulatus sp. nov., adult: leg I-IV, right, antiaxial view. Scale bars: 100 µm (19 - 22).