Betaburmesebuthus larafleissnerae Lourenço & Velten, 2016

XUAN, QIANG, CAI, CHEN-YANG & HUANG, DI-YING, 2023, Revision of palaeoburmesebuthid scorpions in mid-Cretaceous amber from northern Myanmar (Scorpiones: Buthoidea), Palaeoentomology 6 (1), pp. 64-101 : 83-88

Betaburmesebuthus larafleissnerae Lourenço & Velten, 2016

( Figs 16–18 )

Material. NIGP 201155, one probable juvenile male, part of pedipalp missing.

Diagnosis (emended). This species can be clearly distinguished from other congeners by the following set of characters: 1) anterior margin of carapace with a feebly marked median concavity ( Fig. 17A ; Lourenço, 2016b: fig. 2); spiracles slit, not oblique ( Fig. 17I ); 3) pectines with 17–18 teeth ( Fig. 17H ; Lourenço, 2016b: fig. 3); 4) vesicle pear-shaped and slightly dilated, and aculeus very long and moderately curved, base of aculeus wide ( Fig. 17G ; Lourenço, 2016b: fig. 5); 5) dorsal patellar spur carina well-developed with three strong tubercles and a very small tubercle ( Fig. 18C, D ); 6) Chela manus with one small spinous tubercles on internal surface ( Fig. 18F ); 7) telotarsus with few ventrosubmedian setae and a ventromedian spinules row ( Fig. 17C ).

Description. Carapace. Sparsely covered by fine granules ( Fig. 17A ); median eyes oval and medium sized, and separated by more than one ocular diameter ( Fig. 17A ); PDMi anterodorsal to PLMa, and ADMi dorsal to PLMa ( Fig. 17B ).

Chelicerae ( Fig. 17A ). With setae on internal and ventral surfaces; cheliceral dentition partly visible, including a long dorsal distal (dd) denticle, a small subdistal (sd) denticle, a stout median (m) denticle, other denticles not visible.

Pedipalps. Femur with four carinae observed ( Fig. 18A,B, E ):internomedian and ventroexternal carinae welldeveloped with several small tubercles; dorsointernal and dorsoexternal carinae smooth. Patella with four carinae observed ( Fig. 18C, D ): Dorsal Patellar Spur carina well marked, dorsointernal, dorsomedian and dorsoexternal carinae costate with several granules.

Trichobothrial pattern ( Fig. 18 ). Femur with 10 trichobothria, 5 dorsal, 3 internal and 2 external trichobothria, trichobothrium d 2 straddling dorsointernal carina ( Fig. 18A, B, E ) and trichobothrium e 1 aligned or slightly proximal to trichobothrium d 5 ( Fig.18A,E ).Patella with 12 trichobothria observed ( Fig. 18C, D ), including 5 dorsal (d

2 petite), 1 internal and 6 external trichobothria; trichobothrium d 3 straddling to dorsomedian carina and trichobothrium d 4 external to dorsomedian carina. Chela manus with 3 externals observed.

Legs. Trochanter bearing a lateral apophysis ( Fig. 16B ). Prolateral and retrolateral pedal spurs present on all legs.

Mesosoma. Tergites slightly putrefactive, carinae not evident ( Fig. 17D ).

Metasoma ( Fig. 17E–G ). All segments longer than width and covered by macrosetae ventrally. Segments I–III with week depression dorsally; segments I and II with ten carinae (paired ventromedian, ventrolateral, lateral, dorsolateral, and dorsal carinae); segments III and IV with eight carinae (paired ventromedian, ventrolateral, dorsolateral, and dorsal carinae); segment V with five carinae (single ventromedian carina, paired ventrolateral and dorsolateral carinae); dorsal and ventral carinae on segments I–IV slightly serrated, other carinae costate.

Telson ( Figs 16A , 17G ). Vesicle covered by several macrosetae ventrally and carinae not evident, a small subaculear tuberance observed and subaculear setal pair significantly evident.

Figures

FIGURE 16. General habitus of Betaburmesebuthus larafleissnerae, NIGP201155, under incident light. A, Dorsal view. B, Ventral view. Scale bars = 1 mm.

FIGURE 17. Details of Betaburmesebuthus larafleissnerae, NIGP201155, A, C–G under green epifluorescence; B under confocal microscopy; H, I under incident light. A, Carapace and chelicerae, dorsal view. B, Lateral ocelli. C, Tarsus of right leg III. D, Tergites. E, Metasomal segments I–IV and telson, lateral view. F, Metasomal segments I–III, ventral view. G, Metasomal segments IV–V and telson, lateral view. H, Pectines. I, Sternite V with right spiracle. Abbreviations: ADMi, anterodorsal minor ocellus; ALMa, anterolateral major ocellus; MLMa, mediolateral major ocellus; PDMi, posterodorsal minor ocellus; PLMa, posterolateral major ocellus; sp, spiracle; st, subaculear tubercle; ts, tibial spur. Scale bars = 400 μm in A, D, E, F, G, H; 200 μm in C, I; 50 μm in B.

FIGURE 18. Trichobothrial pattern of Betaburmesebuthus larafleissnerae, NIGP201155, A, C, E, F under green epifluorescence; B, D under confocal microscopy. A, B, Right femur, dorsal view. C, D, Left patella, dorsal view. E. Left femur, dorsal view. F, Left chela, dorsal view. Scale bars = 200 μm.