Anderemaeus chilensis Hammer, 1962

Norton, Roy A. & Ermilov, Sergey G., 2019, Anderemaeus (Acari, Oribatida) - overview, three new species from South America and reassessment of Anderemaeidae supported by ontogeny, Zootaxa 4647 (1), pp. 241-289 : 268

Anderemaeus chilensis Hammer, 1962

( Figs 20–22 )

Anderemaeus species with adult size 670–786 × 407–504. Cerotegument mostly thin, encrusting, with adherent organic and mineral particles ( Figs 20F , 22J ), adherent dirt rarely in large masses ( Fig. 22K ); where distinct, excrescences granular ( Fig. 22D ) to phallus-like, covered with minute dust-like particles ( Fig. 22 E, G, H ). Rostrum with terminal mucro and prominent rostral bulge ( Fig. 20F ). Lamella simple in form, broadest in middle third, without lateral tooth but with distinct tubular cusp and long prolamella; main part of lamellar pair moderately converging, mutual distance of setal pair le slightly greater than that of ro, but prolamellae ( Fig. 20D, F ) converging strongly, nearly touching at tips. With distinct transverse prelamellar ridge but without laterorostral carina ( Fig. 20E ). Seta in long, inserted on small tubercle well anterior to notogastral margin; with additional larger, subtriangular tubercle midway between each in and margin ( Fig. 22F ). Bothridial seta long, baculiform, slightly tapered to slightly expanded distally ( Fig. 20I ), with minute, inconspicuous barbs. Humeral process well developed. Notogastral setae relatively large (lm ~100), mostly (except c) erect, isodiametric to weakly clavate ( Fig. 20H ), distinctly and densely barbed. Aggenital enantiophysis (e4) usually with small tooth at medial corner of posterior tubercle ( Fig 20J ); enantiophysis e3 absent; tubercle of seta 3b expressed as low mound extending across sejugal groove, 3c without tubercle. Anterior border of subcapitular mentum strongly rebordered by unusually thickened edge ( Fig. 20G ). Legs with tarsi longer than respective tibia on I, II but similar in length on III, IV; genua I, II longer than III, IV ( Fig. 22A, B ). Femora III, IV respectively 1.4, 1.6 x longer than wide; each with distinct ventral blade, not produced as tooth or spine. Trochanters III and IV with large dorsodistal spine; III with ventrodistal keel and separate small, sharp proximal tooth; IV with larger blade, extending entire ventral length and produced proximally as tooth. Solenidion σ of genu I subflagellate, distinctly longer than segment; φ of tibiae II–IV subflagellate, equal or only slightly less than segment length. Preanal organ distinctly expanded internally ( Fig. 21C ), often almost T-shaped.

Figures

FIGURE 20. Anderemaeus chilensis Hammer, 1962, adult: A, dorsal view; B, ventral view; C, left part of transverse section through mid-region of hysterosoma; D, anterior region of holotype prodorsum, dorsal view; E, prodorsum of dissected specimen, right lateral view; F, parasagittal section of anterior proterosoma, cut to right of lamella (setae le broken), internal view (insert: close-up of rostral bulge); G, same, cut to right of tutorium, showing condyle (white asterisk) articulating with subcapitulum, and rebordered margin of mentum (black asterisk); H, notogastral seta h 1 of holotype; I, tip of bothridial seta, holotype on left, specimen from Tome, Chile on right; J, left aggenital region, ventral view. Photomicrographs in transmitted light, DIC, except A, B reflected light. Scale bars 100 μm (A, B); 20 μm (C–G); 10 μm (H, J); 5 μm (I).

FIGURE 21. Anderemaeus chilensis Hammer, 1962, adult: A, parasagittal section near midline (insert: enlargement of transverse incision); B, same, just medial to bothridium, such that sejugal groove cut at angle; C, preanal organ, internal view, anterior to right; D, genital region of parasagittal section of hysterosoma, cut just lateral to ovipositor, internal view; E, same, but showing posterior part of anal plates; F, external posterior view of anal region; G, parasagittal section of podosoma cut at edge of right genital plate, anterior to right, internal view; H, transverse section of podosoma in strongly cleared specimen, anterior view of apodemes I; I, same, region of left acetabulum IV, posterior view. Photomicrographs in transmitted light, DIC. Scale bars: 20 μm.

FIGURE 22. Anderemaeus chilensis Hammer, 1962., adult: A, leg I, proximal half; B, leg IV, proximal half; C, D, framed region of B, in different specimens; E, dorsal spine of trochanter IV, with dislodged cerotegument; F, right sejugal region, dorsal view; G, cerotegument dislodged from mid-prodorsum; H, same, from epimere I; I, trochanter IV, enlarged from B; J, notogastral surface between setae h 2, h 3; K, unusual specimen with heavy dirt load. Photomicrographs in transmitted light, DIC. Scale bars: 100 μm (K); 20 μm (A, B, F); 10 μm (I, J); 5 μm (C–E, G, H).