Neoeutegaeus malcolmi, Colloff, 2023
publication ID |
https://doi.org/ 10.11646/zootaxa.5365.1.1 |
publication LSID |
lsid:zoobank.org:pub:1DC72714-D0E8-49D8-821D-03C6B2A7AE80 |
DOI |
https://doi.org/10.5281/zenodo.10167878 |
persistent identifier |
https://treatment.plazi.org/id/03A2C77C-464E-FFFD-C79C-B5D81505DD70 |
treatment provided by |
Plazi |
scientific name |
Neoeutegaeus malcolmi |
status |
sp. nov. |
Neoeutegaeus malcolmi sp. nov.
( Fig. 24 View FIGURE 24 )
Dimensions. Holotype female length 280 μm, breadth 186 μm, paratype females (n = 16) length 278 μm (range: 271–292 μm), breadth 175 μm (range: 166–193 μm); paratype males (n = 4) length 265 μm (range: 263–267 μm), breadth 162 μm (range: 160–164 μm). Ratio of prodorsum to total length (holotype): 0.48.
Description of adult. Prodorsum: rostrum acute; rostral setae (ro) short, straight, smooth, not visible in dorsal aspect. Lamellae broad, very long, almost half body length, extending well beyond rostrum, separated medially, lateral margins convex ( Fig. 24a View FIGURE 24 ). Lamellar seta (le) short, curved medially, smooth, emerging from alveolus on anterior margin of cone-shaped lamellar cusp; medial margins of cusps convex, with complete translamella. Interlamellar setae (in) minute, close together. Bothridia elongate, corniculate, projecting laterally beyond inner margins of humeral processes, openings angled anterolaterally. Bothridial seta long, head club-shaped, apex rounded, smooth.
Notogaster: ratio of length to breadth: 0.82; notogaster rounded, convex. Humeral processes very long, as long as lamellae, straight, parallel, triangular, pointed, extending to point just posterior of translamella, lateral margin expanded where process joins anterolateral margin of notogaster forming slight projection ( Fig. 24a View FIGURE 24 ). Lyrifissures ia and im short. With eight pairs of notogastral setae, l series and h 2 and h 3 sub-marginal, smooth, short, sub-equal in length, stout, covered in cerotegument; p series very short, not visible in dorsal aspect.
Ventral aspect: subcapitulum acute; subcapitular setae extremely short, sub-equal in length, smooth ( Fig. 24b View FIGURE 24 ). Tutorium very broad, pointed. Epimeral plates discrete, broadly separated in midline, sub-rectangular to ovoid, plates III and IV much shorter than I and II; with median strip of dumbbell-shaped cuticle between plates I and II; epimeral setation 3-1-2-2; setae very short, sub-equal in length. Pedotectum I (pd I) well-developed, rectangular, with blunt anterior apex; pd II very long, broad, lateral margin sloped obliquely; discidium broad, pointed apically; perigenital carina and enantiophysis E4 present. Ventral plate ovoid, markedly broader than long. Genital and anal plates separated by distance of half length of genital plates; genital plates 36 µm long, with five pairs of short setae sub-equal in length, aligned longitudinally; two pairs of extremely short adanal setae; lyrifissure iad in para-anal position, some distance from margin of anal plate, about same as distance from plate as bases of setae ad 2. Anal plates ovoid, 41 µm long. Pre-anal organ (po) oval.
Type designation, material examined and locality data. Holotype female, ANIC accession no. 53-1063, ANIC 3751 About ANIC , sieved litter and mossy logs, rainforest with Eucalyptus sp. , Lyrebird Nature Walk, 3.3 km south-east of Mount Field, Mount Field National Park , Tasmania, 42°41'S, 146°40'E, 690 m., coll. T. Weir and C. Lemann, 8.iii.2008 GoogleMaps . Paratypes: 12 females, three males, ANIC accession no. 53-10064, ANIC 3757 About ANIC , sifted litter and mossy logs, rainforest with Eucalyptus sp. , State Forest , 2.2 km NE Corinna, Tasmania, 41°38’43”S 145°05’50”E, 45 m GoogleMaps ., coll. T. Weir & C. Lemann, 14.iii.2008 . Paratype female, ANIC accession no. 53-1065, ANIC 666 About ANIC , litter and rotting log debris, Nothofagus cunninghami rainforest, Mount Field National Park , Tasmania, 42°41'S, 146°43'E, 160–240 m., coll. J. Lawrence & T. Weir, 30.i.1980 GoogleMaps . Paratypes: four females, one male, ANIC accession no. 53-1066, TAS-183, litter, Eucalyptus forest, Old Farm Road, Mount Wellington, Tasmania, 42°54'S, 147°14'E, coll. P. Greenslade, 20.v.1989 GoogleMaps .
Etymology. This species is named in honour and in memory of my friend and colleague, the late Dr Malcolm Luxton, formerly of the Department of Biology, Liverpool John Moores University and National Museum of Wales, Cardiff, in recognition of his substantial contribution to the systematics, taxonomy and ecology of oribatid mites.
Diagnosis. Neoeutegaeus malcolmi can be distinguished from other species in the genus by the following combination of characters: (1) the narrow, acute, cone-shaped lamellar cusps lacking teeth,; (2) the short, smooth lamellar setae; (3) the minute interlamellar setae; (4) the prodorsum almost as long as the notogaster; (5) the long, club-shaped bothridial setae with smooth head; (6) the large, curved pedotecta II with straight, oblique margins folded dorsally; (7) the broad, pointed discidium; (8) the epimeral setal formula 3-1-2-2.
Remarks. Neoeutegaeus malcolmi shares with N. torsteini the lamellar seta emerging from the apex of the free lamellar cusp, but in N. malcolmi the cusps are cone-shaped and relatively long, whereas in N. torsteini they are sub-triangular, shorter and broader.
ANIC |
Australian National Insect Collection |
T |
Tavera, Department of Geology and Geophysics |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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