Ceratophysella jondavi Wray 1946

• Main Author: Bernard, Ernest C.
• Format: Text
• Language: unknown
• Published: Zenodo 2015
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Entognatha; Collembola; Hypogastruridae; Ceratophysella; Ceratophysella jondavi; Arctic; Brooklyn; New Zealand; Raleigh; Seta
• Online Access: https://dx.doi.org/10.5281/zenodo.5664741; https://zenodo.org/record/5664741

Ceratophysella jondavi (Wray, 1946) Fig. 4 Achorutes jondavi Wray 1946: 79. Ceratophysella jondavi Salmon 1964: 216 (as jondaui ); Christiansen & Bellinger 1980: 148, 1998: 155. Specimens examined. Lectotype female and 21 paralectotypes on slides (by present designation), numerous paralectotypes in ethanol, USA, North Carolina, Raleigh, Bloomsbury Park, 9 December 1943, mushrooms on rotted log, G. F. Knowlton, coll. Redescription. Body length up to 0.95 mm [up to 1.6 mm]. [Body with yellow background sprinkled with reddish-rust-colored specks heavier on head and antennae]. Granulation fine to moderate, granule width 2.3–2.8 Μm; Yosii’s ‘a’ number 11–12. Body setae consisting of smooth, setiform macrosetae and mesosetae, longest subcoxal setae serrated (Fig. 4 A). Head with all dorsal setae; setae c 4, d 2, d 4, d 5, p 1, p 2, p 4 and v 2 macrosetae. Lateral seta of pronotum slightly longer than more medial setae. Thoracic and abdominal sensilliform setal lengths equal to or longer than neighboring p-setae. On mesonotum, m-row lacking seta m 2 but with extra seta m 3 ’; setae p 2, p 5 and p 6 macrosetae, seta p 2 forward of p 1 and p 3. Metanotum lacking seta m 2 and extra seta m 3 ’, p 2 and p 5 macrosetae, p 2 slightly forward of p 3; microsensillum not observed. Tergites I–III with setae p 2, p 6 and occasionally p 4 as macrosetae. On Abd. IV p 2 as a macroseta, m 1 slightly thickened; on Abd. V p 1 a macroseta. Seta a 3 missing on abdominal tergites I–III, present on tergites IV and V. M-row setae m 2, m 3 and m 4 usually present on Abd. I–IV, m 2 and m 3 occasionally missing. Seta p 1 much longer than p 2 on tergite V (Figs. 4 A, B); 3 + 3 anterior setae inside the p 5 setae. Subcoxae I–III with 1, 2, 2 setae, respectively, the longer setae serrate. Plurichaetosis absent. Antennal segment IV with weakly bilobed or entire apical vesicle, without prominent, granulated apical protrusions (Figs. 4 D, E). Subapical organite of Ant. IV very small, peg-like, microsensillum minute, rod-like in pit; two lateral and five dorsal sensilla, the lateral sensilla plumper than the dorsal sensilla; nearly all dorsal setae sensilliform, most ventral setae setiform. Ventral sensory field with 25–30 slender, capitate or brush-tipped sensilla, one sensilliform seta near center of sensory field, three longer, rounded subapical sensilla and straight apical sensilliform seta (Fig. 4 E). Sense organ of Ant. III (Fig. 4 D) with two oval sensilla in shallow groove flanked by longer tapering sensilla; slender peg-like microsensillum present on Ant. III (Fig. 4 E). Eversible sac between Ant. III and IV present. Antennal segment I with 7 setae, Ant. II with 12 setae. Postantennal organ width up to twice the diameter of nearest ocelli, anterior lobes longer and broader than posterior lobes, accessory tubercle present (Fig. 4 F). Labrum roughly trapezoidal, anterior edge straight medially; basal two-thirds granulate, with four linear tubercles; setal formula 5, 5, 4. Maxilla with lamella 1 finely serrated and ciliated, extending past capitulum head; lamella 4 longer than lamella 2; bifurcated “toothbrush” present (Fig. 4 G). Sublobal hairs of outer maxillary lobe not seen clearly. On labial palpus (Fig. 4 H) lengths of sensilla A–E equal to or shorter than most guard setae; a 1 and b 1 ovate, b 2, d 2 and e 2 spine-like, lateral papilla lp conical; guard setae b 3, b 4, d 3 and, d 4 spatulate, all e guard setae linear; guard setae d 1 and e 7 absent. Labial palpus with six proximal setae. Tibiotarsi I, II, and III with 19, 19, 18 setae, respectively. Clavate tenent hairs absent. Unguis (Fig. 4 I) slender with one basal pair of small lateral teeth and ventral tooth. Unguiculus with basal lamella and terminal spine not reaching ventral tooth. Ventral tube with 4 + 4 setae. Tenaculum with 4 + 4 teeth, without setae. Dens less than twice length of mucro, strongly tuberculate dorsally, with seven setae; inner three setae slightly to greatly swollen, usually strongly serrated in basal half; outer setae slender and smooth (Figs. 4 J‒L). Mucro spoon-shaped, tuberculate basally, apex rounded, with strong outer lamella (Figs. 4 J‒L). Anal spines on short basal papillae, upright, short, about half the length of inner edge of hind unguis. Remarks. Ceratophysella jondavi is a member of the C. denticulata -group. Christiansen & Bellinger (1980, 1998) examined a single type specimen and another specimen attributable to C. jondavi , and counted 16 granules in Yosii’s “a” measure, but noted in their Ceratophysella character chart (Table VII, p. 138) that the number was “ 16 ±”. To reach C. jondavi in their key, seta p 1 on Abd. IV would need to be longer than seta p 2. However, their chart of Ceratophysella characteristics indicates that p 1 is shorter than p 2. Assuming the chart is correct, C. jondavi will trace to a couplet that separates the maheuxi and denticulata groups by Yosii’s “a” measure ( maheuxi 16 or more, denticulata 14 or less). If the higher number is used C. jondavi traces to H . ( C .) krafti (Fjellberg 1985), which is a Mitchellania -group species. The lower number places C. jondavi in the denticulata -group, where it is very similar to the “ exilis ” form ( C. exilis (Yosii 1956) also see Yosii (1962)) and C. palustris (Martynova, 1978) (also see Fjellberg 1985). The validity of C. jondavi can be questioned and it could be considered a variant of C. denticulata (Bagnall, 1941), but until better resolution can be attained for this species complex it is better to keep well-described taxa separated. : Published as part of Bernard, Ernest C., 2015, Redescriptions of Hypogastruridae and Onychiuridae (Collembola) described by David L. Wray, pp. 301-338 in Zootaxa 3918 (3) on pages 307-309, DOI: 10.11646/zootaxa.3918.3.1, http://zenodo.org/record/233960 : {"references": ["Wray, D. L. (1946) New Collembola from North Carolina. Bulletin of the Brooklyn Entomological Society, 41, 79 - 85.", "Salmon, J. T. (1964) An index to the Collembola, Vol. 2. Bulletin No. 7, Royal Society of New Zealand, Wellington, 500 pp.", "Christiansen, K. A. & Bellinger, P. F. (1980) The Collembola of North America north of the Rio Grande. Grinnell College, Grinnell, Iowa, 1467 pp.", "Christiansen, K. A. & Bellinger, P. F. 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