Anderemaeus hammerae Mahunka, 1980

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 : 272

Anderemaeus hammerae Mahunka, 1980

( Figs 23 , 24 )

Anderemaeus species with adult size 580–680 × 383–436. Cerotegument, dense and often slightly pigmented, excrescences mostly polyp-like, with several tapered arms, or bullet-shaped ( Fig. 24 D–G, I); little or no adherent particulate debris. Rostrum with terminal mucro and moderate rostral bulge. Foveation present between lamellae in anterior half of prodorsum. Lamella simple, with distinct tubular cusp and short prolamella; latter pair converging more strongly than lamellae. Mutual distance of setal pair le slightly greater than that of ro. Prelamellar ridge weakly developed or absent. Tutorium extended unusually far anteriorly onto rostrum as carina ( Fig. 23F ). Seta in long (~120), baculiform, nearly smooth, with extremely minute, inconspicuous barbs ( Fig. 23E ); each seta inserted on strongly-projecting tubercle, about its width removed from notogastral margin. Bothridium ( Figs 23G , 24C ) with series of conspicuous, rounded tubercles posteriorly; bothridial seta (75–80) much shorter than in, virtually smooth, with distinct pyriform head. Notogaster covered with shallow foveolae ( Fig. 23A ); humeral process strongly developed, with oblique dorsal carina ( Fig. 24C ). Notogastral setae relatively long (lm ~75–80), mostly (except c) erect, heavily barbed, isodiametric or acicular ( Fig. 24F ). Enantiophysis e3 present ( Fig. 24H ), posterior tubercle extended as ridge across epimere IV to merge with e4; tubercle of seta 3b distinct, with opposing small tubercle across sejugal groove to form ventrosejugal enantiophysis (ev). Legs ( Fig. 24A, B ) all with tarsus slightly longer than respective tibia; genua I, II longer than III, IV. Femora III, IV about 1.7 times longer than broad, each with ventral keel, enlarging to narrow blade distally, not produced as tooth or spine. Trochanter III with modest proximal (anterior pointing) spine ( Fig. 24I ) and dorsodistal tooth; IV only with dorsodistal 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 ( Fig. 23B , insert) slightly expanded internally, often vase-like.

Figures

FIGURE 23. Anderemaeus hammerae Mahunka, 1980 adult: A, dorsal view (insert: enlargement from central notogaster, showing shallow foveolae); B, ventral view (insert: preanal organ, ~45 μm long); C, lateral view of dark specimen; D, part of acetabulum I, showing bifid tracheal trunk, internal view, dissected specimen; E, interlamellar seta; F, prodorsum lateral view (slightly dorsal, seta le broken from cusp); G, transverse section of strongly cleared specimen, cut behind sejugal region, posterior view (setae in broken); H, same, ventral region showing apodemes 2; I, same, shallower focus showing sejugal apodemes; J, same, shallower focus showing apodemes 3; K, same, shallower focus showing acetabulum IV and spermatopositor. Photomicrographs in transmitted light, DIC, except A, B reflected light. Scale bars: 100 μm (A–C); 20 μm (E–K); 5 μm (D).

FIGURE 24. Anderemaeus hammerae Mahunka, 1980, adult:A, leg I, B, leg IV; C, bothridial region, dorsal view; D, cerotegu- ment dislodged from pedotectum I; E, cerotegument dislodged from genital plate (left) and aggenital region (right); F, region of notogastral setae h3, with dislodged cerotegument; G, same, region of notogastral seta h2; H, region of epimeres III, IV, anterior to right; I, discidium and part of trochanter III, ventral view, anterior to right (insert: enlargement of cerotegument excrescences). Photomicrographs in transmitted light, DIC. Scale bars: 20 μm (A, B, C, H); 5 μm (all others).