Palaeoburmesebuthus sarahmeyerae Lourenço, 2025

Lourenço, Wilson R. & Velten, Jürgen, 2025, A particular new species for the genus Palaeoburmesebuthus Lourenço, 2002 from Burmite (Scorpiones: Palaeoburmesebuthidae), Faunitaxys (London, England) 13 (37), pp. 1-5 : 1-4

Palaeoburmesebuthus sarahmeyerae Lourenço sp. n.

( Fig. 1-9)

ZooBank:https://zoobank.org/ 658FB45E-C890-43F2-94E3-4675FBDDAAB6

Diagnosis for the new species. –General morphology similar to that of other species of the genus Palaeoburmesebuthus Lourenço, 2002 , but showing more similarities with Palaeoburmesebuthus knodeli Lourenço, 2018 . The following combination of characters can be used to diagnose the new species. Sternum sub-pentagonal. Tergites with three carinae, the lateral one rather inconspicuous; granulation moderately to weakly marked. Sternites with small, oval to rounded spiracles. Metasomal segments I and II with 10 carinae; III-IV with 8 carinae; V with 5 carinae; setation on all metasomal segments moderately marked. Telson granular, without a subaculear tubercle. Pectines large and long, with 18-x teeth. Trichobothrial pattern can be globally observed, with elements clearly fitting those of extant buthid type A ( Vachon, 1974). Femur with 5 dorsal, 2 external and 4 internal trichobothria disposed in alpha (α) configuration ( Vachon, 1975); external trichobothria in a very marked proximal position with e 2 at the same level as d 5. Patella with one internal and 5 dorsal trichobothria; 5-6 external trichobothria are suggested by the presence of fine setae; chelal trichobothria well observable: chela hand with Eb 1-3, Esb, Est, Et; fixed finger with eb, esb, est, et, db, dt; it not observable. Tibial spurs present on legs III and IV, moderately marked.

Type locality and horizon. – Myanmar (Burma), Kachin; precise locality unknown; Lower Cretaceous .

Patronym. – The specific name honours Mrs Sarah Meyer (Wangenried, Switzerland), who supported, together with Mr Andrè Schmidt, the present study.

Depository. – The type specimen is deposited in the collections of Mr Andrè Schmidt ( Zofingen, Switzerland) .

Description

Coloration. –Yellow to slightly reddish-yellow; carapace and tergites yellow; metasomal segments reddish-yellow; telson dark reddish; aculeus reddish; pedipalps and legs yellow to pale yellow. Ventral aspect yellow; pecten yellow to reddish-yellow.

Morphology. – Carapace elongated; anterior margin slightly concave; ocular tubercle anterior to the centre of the carapace; three lateral eyes; carinae, granulations and furrows moderately to weakly marked. Sternum sub-pentagonal. Mesosomal tergites moderately to weakly granular, with one median carina and two very inconspicuous lateral carinae; VII with five moderately to strongly marked carinae. Pectines: only one pecten is observable with 18 teeth; fulcra inconspicuous. Sternites weakly granular to smooth, with small, oval to almost rounded spiracles. Metasomal segments I to IV slightly rounded, with 10-10-8-8 carinae; segment V slender, with five carinae; dorsal carinae of segments I-IV with only minute spinoid granules; dorsal aspect of segments I to V weakly depressed; setation on all segments moderately marked. Telson with a long, slim pear-shaped vesicle;

moderately granular, with vestigial ventral and lateral carinae; absence of any subaculear tubercle; aculeus very long and weakly curved; setation weakly marked. Cheliceral dentition similar to that of buthoids (Vachon, 1963). Pedipalp femur pentacarinate; patella with 6-7 carinae; internal face of femur and patella with only minor spinoid granules. Chela slender and not granular with weak carinae. Setation of pedipalps almost absent. Trichobothriotaxy similar to type A ( Vachon, 1974) of extant buthids: dorsal trichobothria of femur disposed in alpha (α) configuration ( Vachon, 1975); for details refer to diagnosis. Tibial spurs present on legs III and IV, moderately marked.

Morphometric values (mm) of male holotype of Palaeoburmesebuthus sarahmeyerae Lourenço sp. n.

– Total length 10.62 (including telson).

– Carapace length 1.34;

anterior width 0.74;

posterior width 1.07.

– Mesosoma length 2.81.

– Metasomal segments

I: length 0.73, width 0.47;

II: length 0.81, width 0.41;

III: length 0.87, depth 0.41;

IV: length 1.05, depth 0.37;

V: length 1.47, depth 0.34.

6-7. Habitus. 6. Dorsal aspect. 7. Ventral aspect. 8. Carapace and pedipalps in detail. 9. Metasomal segments and telson in detail.

– Telson length 1.54.

– Vesicle depth 0.21.

– Pedipalp femur length 1.14, width 0.21;

patella length 1.21, width 0.27;

chela length 2.14, width 0.21;

movable finger length 1.54.

Relationships. – The new species can be distinguished from the other species of the genus and in particular from P.knodeli by the following characters:

( i) very elongated telson without a subaculear tooth,

( ii) spiracles almost round,

( iii) trichobothria e 2 and d 5 of the femur situated at the same level.