Symphylurinus undefined-1

Sánchez-García, Alba, Sendra, Alberto, Davis, Steven & Grimaldi, David A., 2023, Fossil diversity in ‘ dawn’ hexapods (Diplura: Projapygoidea), with direct evidence for being chemically predaceous in the Cretaceous, Zoological Journal of the Linnean Society 198 (3), pp. 847-870 : 856

SYMPHYLURINUS SP. 1

( FIGS 6–11 )

Material: AMNH JZC-DR005 ( Figs 6–8 ), Zigras collection (in AMNH), probably female, adult; specimen entirely preserved and observable ventrolaterally (left side), with the abdominal segments II and III swollen owing to taphonomic processes; the piece is a transparent, orange in colour, with a rounded shape, 32 mm × 20 mm in largest dimensions; syninclusions include seven oniscidean isopods, one acari, one ant, an undetermined number of Collembola hidden by bubbles, coprolites mainly associated with two of the isopods, fungal hyphae and other undetermined organic remains.

AMNH KL-DR2022-1 ( Figs 9–11 ) donated by K. Luzzi, probably female, adult; specimen entirely preserved and observable dorsally, ventrally and laterally (both sides); the right cercus ( Fig. 10F ) expelling the glandular substance probably as a stress behaviour in response to being trapped in resin; preserved in a rectangular chip of transparent yellow amber trimmed to 4mm × 8 mm × 1mm;syninclusions include two Coleoptera larvae, at least 11 nematodes, plant trichomes and other undetermined organic remains.

Figures

Figure 6. Photomicrographs of Symphylurinus sp.1 (AMNH JZC-DR005)in Miocene Dominican amber.A, left ventrolateral habitus. B, detail of cerci. Abbreviations: gp, genital papilla; stVII, stylus VII. Scale bars: 1 mm in A; 0.1 mm in B.

Figure 7. Camera lucida drawings of Symphylurinus sp. 1 (AMNH JZC-DR005) in Miocene Dominican amber. A, left ventrolateral habitus. B, detail of right tarsi of leg III. C, right abdominal stylus V. D, right abdominal stylus VI. E, right abdominal stylus VII. F, detail of infundibuliform complex of left cercus. Abbreviations: a, apical macroseta; lp, labial palpus; M, sternal macroseta; sa, subapical macroseta; scA, lateral subcoxal appendage; stI–stVII, stylus I–VII; vm, ventromedial macroseta. C–F are to the same scale. Scale bars: 0.5 mm in A; 0.2 mm in B; 0.1 mm in C–F.

Figure 8. Volume renderings of Symphylurinus sp. 1 (AMNH JZC-DR005) in Miocene Dominican amber. A, dorsal habitus. B, ventral habitus. C, right lateral habitus. All to the same scale. Scale bar: 1 mm.

Figure 9. Photomicrograph of Symphylurinus sp. 1 (AMNH KL-DR2022-1), dorsal habitus, in Miocene Dominican amber. Scale bar: 0.5 mm.

Figure 10. Photomicrographs of Symphylurinus sp. 1 (AMNH KL-DR2022-1) in Miocene Dominican amber. A, detail of head in dorsal view. B, detail of head in ventral view. C, detail of cerci in dorsal view. D, left infundibuliform complex showing the orifice. E, detail of pretarsus of left leg II. F, right infundibuliform complex showing an incipient secretion. Abbreviation: lp, labial palpus. A–C and D–F are to the same scale. Scale bars: 0.1 mm in A–C; 0.05 mm in D–F.

Figure 11. Camera lucida drawings of Symphylurinus sp. 1 (AMNH KL-DR2022-1) in Miocene Dominican amber. A, detail of head and antennae in dorsal view. B, detail of thorax showing the distribution of macrosetae. C, detail of cerci in dorsal view. Abbreviations: b, bubble; M, macroseta. A, C are to the same scale. Scale bars: 0.1 mm.