Plenotocepheus (Plenotocepheus) trinidadensis, Ermilov, 2017

Ermilov, S. G., 2017, Contribution to the knowledge of the genus Plenotocepheus (Acari, Oribatida, Otocepheidae), Acarologia 57 (2), pp. 383-391 : 384-388

Plenotocepheus (Plenotocepheus) trinidadensis n. sp.

( Figures 1-3 )

Zoobank: B963EBFB-B37E-40F6-B456-6F26A8E926E4

Diagnosis — Body size: 597 – 630 × 315 – 332. Body surface macrofoveolate. Interlamellar setae longer than lamellar and rostral setae, all setiform, barbed. Bothridial setae clavate, smooth. Prodorsal medial condyles triangular, lateral condyles truncate. Medial and lateral notogastral condyles absent. Notogastral setae setiform, with flagellate tips, barbed, differing in length, h 3 shortest, p 1 and p 3 shorter than c 1 and da, other setae longer. Subcapitular setae a narrowly phylliform. Epimeral setae thin, barbed, 1b, 3b and 4a longest, 4b slightly shorter, other setae shorter. Genital and aggenital setae setiform, thin, slightly barbed, adanal and anal setae thicker, setiform, barbed. Leg claws slightly serrate on dorsal side. Leg setae pv” on tarsi IV and v” on tibiae III and IV broadly phylliform, l’ on trochanters III long, thickened, heavily barbed.

Measurements — Body length: 630 (holotype, male), 597, 614 (two paratypes, both males); notogaster width: 332 (holotype, male), 315, 332 (two paratypes).

Integument ( Figs 1 A-B, 2) — Body color light brown. Body surface porose and densely foveolate (diameter foveoles up to 10). Lateral body sides (between lateral condyles and acetabula II) tuberculate (diameter of tubercles up to 4). Lateral parts of genital plates with one slightly developed longitudinal strium.

Ermilov S.G.

Prodorsum ( Figs 1A , 2 ) — Rostrum broadly rounded. Costulae (cos) longer than half of prodorsum, thin, located dorsally. Rostral (ro, 77 – 82) and lamellar (le, 90 – 94) setae setiform, barbed, curving antero-medially. Interlamellar setae (in, 118 – 123) slightly thicker, barbed, directed upwards. Bothridial setae (bs, their length out of bothridia 90 – 98) clavate, smooth, with longer stalk and shorter head narrowly rounded distally. Exobothridial setae (ex, 20 – 24) thin, indistinctly barbed. Lateral carinae not developed. Prodorsal condyles poorly visible, medial condyles (co.pm) triangular, located separately, lateral condyles (co.pl) truncate distally.

Notogaster ( Figs 1A , 2 ) — Medial and lateral notogastral condyles absent. Notogaster with 14 pairs setae setiform, with flagellate tips, barbed, h 3 shortest (61 – 73), p 1 and p 3 (90 – 94) shorter than c 1 and da (114 – 118), other setae longer (131 – 147). Lyrifissures (ia, im, ip, ih, ips) and opisthonotal gland openings (gla) distinct.

Gnathosoma ( Figs 1B , 2 ) — Generally, morphology is typical for Plenotocepheus ( Grobler 1995a; Ermilov et al. 2013). Subcapitulum longer than wide (135 – 143 × 82 – 90). Subcapitular setae a (20 – 24) narrowly phylliform, indistinctly barbed, m and h similar in length (49 – 53), setiform, barbed. Adoral setae and their alveoli absent. Palps (69) with setation 0-2-1-3-8(+ ω). Chelicerae (143 – 147) with two setiform, barbed setae, cha (45) longer than chb (28). Trägårdh’s organ narrowly triangular.

Epimeral and lateral podosomal regions ( Figs 1B , 2 ) — Apodemes 1, 2, 3 and sejugal apodemes distinct. Short sternal apodeme present on epimere I. Epimeral setal formula: 3-1-3-3; setae setiform, barbed, 1b, 3b and 4a longest (57 – 65), 4b slightly shorter (45 – 53), other setae shorter (32 – 36). Pedotecta I (Pd I) and II (Pd II) represented by small laminae. Discidia (dis) elongate triangular, rounded distally.

Anogenital region ( Figs 1B , 2 ) — Three pairs of genital setae (g 1 - g 3, 32 – 36), one pair of aggenital (ag, 36 – 45) setae setiform, thin, slightly barbed. Three pairs of adanal (ad 1 - ad 3, 61 – 69), two pairs of anal (an 1, an 2, 49) setae thicker, setiform, barbed. Adanal setae ad 3 located in adanal position, intersetal distance ad 3 - ad 3 larger than ad 2 - ad 2 and ad 1 - ad 1.

Note: Roman letters refer to normal setae, Greek letters to solenidia (except ɛ = famulus). Single prime (') marks setae on the anterior and double prime (") setae on the posterior side of a given leg segment. Parentheses refer to a pair of setae. Tr – trochanter, Fe – femur, Ge – genu, Ti – Tibia, Ta – tarsus.

* – ft' present or absent

Adanal lyrifissures (iad) inverse apoanal.

Legs ( Figs 3 A-D) — Morphology generally typical for Plenotocepheus ( Grobler 1995a, b; Ermilov et al. 2013). Claw of each leg strong, slightly serrate on dorsal side. Tarsi without teeth. Formulas of leg setation and solenidia: I (1-4-3-4-16) [1-2-2], II (1-4- 3-3-15) [1-1-2], III (2-2-1-2-15(14)) [1-1-0], IV (1-2-2- 2-12) [0-1-0]; homology of setae and solenidia indicated in Table 1. Famulus short, indistinctly dilated distally. Leg setae setiform (except broadly phylliform pv” on tarsi IV and v” on tibiae III and IV), barbed (except smooth p on tarsi I and s on tarsi I, II), l’ on trochanters III long, thickened, heavily barbed, u setiform on all tarsi. Solenidia ω 1 on tarsi I and ω 1 and ω 2 on tarsi II of medium size, erect, blunt-ended, other solenidia long, setiform.

Type deposition — The holotype is deposited in the collection of the Netherlands Centre for Biodiversity Naturalis, Leiden, The Netherlands; two paratypes are deposited in the collection of the Tyumen State University Museum of Zoology , Tyumen, Russia .

Etymology — The specific name trinidadensis refers to Trinidad, where the new species was collected.

Remarks — Plenotocepheus (Plenotocepheus) trinidadensis n. sp. is morphologically most similar to P. (Plenotocepheus) neotropicus Ermilov, Sandmann, Marian and Maraun, 2013 from Ecuador in the absence of medial notogastral condyles, presence of long interlamellar and bothridial setae and well-developed notogastral setae, but differs by the notogastral setae c 1 and da distinctly shorter than c 2 and la (versus similar in length) and the absence of lateral notogastral condyles (versus developed).

REMARKS ON THE GENUS Afrotocepheus

Figures

FIGURE 1: Plenotocepheus trinidadensis n. sp.: A – dorsal view (legs not illustrated); B – ventral view (legs except trochanters IV not illustrated). Scale bar 100 µm.

FIGURE 2: Plenotocepheus trinidadensis n. sp.: lateral view, right side (legs except trochanters III and IV not illustrated). Scale bar 100 µm.

FIGURE 3: Plenotocepheus trinidadensis n. sp.: A – leg I, right, antiaxial view; B – tibia and tarsus of leg II, right, antiaxial view; C – genu and tibia of leg tarsus III, left, antiaxial view; D – leg IV, left, antiaxial view (setae p not labeled). Scale bar 50 µm.