Serratochaerilobuthus barbarae, Lourenço & Velten, 2025

Lourenço, Wilson R. & Velten, Jürgen, 2025, Description of a second species for the genus Serratochaerilobuthus Lourenço, 2024 (Scorpiones: Chaerilobuthidae), Faunitaxys 13 (10), pp. 1-6 : 1-2

Serratochaerilobuthus barbarae sp. n.

( Fig. 1-9)

ZooBank:https://zoobank.org/ 0D9BD3D2-6D79-4B1F-9192-4A6F1F0FA224

Holotype. – Most certainly an adult male. Type locality and horizon: Myanmar (Burma), Kachin; precise locality unknown; Lower Cretaceous.

Patronym. – The specific name honors Mrs Barbara Velten (Kirchheimbolanden, Germany) who always supported our studies.

Depository. – The type specimen is deposited in the collections of Mrs Barbara Velten (Kirchheimbolanden, Germany) .

Diagnosis. – Amediunglobalsize comparedtotheotherspeciesof the family Chaerilobuthidae with a total length of 9.06 mm for a possible adult male. The specimen is somewhat bulk with metasoma and pedipalps short;relationship between chela length vs chela width equal to 3.81 ( Lourenço & Velten, 2022).Carapace not emarginated anteriorly, but straight with the presence of a small convexity;median eyes absent and presence of maculae in the place of lateral eyes. Two spinoid apophysis present in the internal aspect of patella. One pecten can be well observed; reduced with 6 teeth; fulcra absent; sternum pentagonal and conspicuous, slightly wider than long; genital operculum with two very flattened oval plates; spiracles small and slightly oval to rounded in shape. Chelicerae not observed; possibly retracted under the carapace. Telson with a largely bulbous vesicle with a thin and long aculeus; presence of a marked spinoid granulation over the metasomal carinae forming serrulas; fixed and movable fingers of the pedipalps with 7-8 series of granules separated by stronger spinoid accessory granules; tarsi of legs with long and sharped ungues. Trichobothrial pattern similar to that of Chaerilobuthidae in general but one or two extra trichobothia can be observed on the ventral aspect of chela; other trichobothria observed are: dorsal and 4 external trichobothria on the femur; 2-3 dorsal, 1 internal and 4-5 external on the patella; 2-3 dorsal, 2-3 external and 3-4 ventral on chela hand and 4-5 on fixed finger.

Description

Coloration. – The scorpion is reddish-yellow to brownish-yellow with some dark reddish zones; carapace yellowish; tergites and sternites brownish-yellow; metasomal segments brownish; telson reddish-brown to reddish-yellow; pedipalps reddish-yellow to reddish-brown; legs yellow. Ventralaspectslightlypalerthandorsalaspect;pectenyellowish-brown.

Morphology. – Carapace without granulations; almost smooth; anterior margin straight with a small convexity. Carinae and furrows absent. Median ocular tubercle totally absent; median eyes absent;presence of maculae in the place of lateraleyes. Sternum pentagonal and conspicuous, slightly larger than long. Mesosomal tergites not granular as carapace and with vestigial carinae; VII with four vestigial carinae. Only one pecten is observed; small and with 6 teeth; fulcra absent; the zone with peg sensillae can be observed on some teeth. Sternites can be roughly observed since they partially suffered with the mummification process; almost smooth, with spiracles small and oval to rounded in shape. Metasomal segments I to IV with 10-10-8-8 observable carinae; segment V with 5 carinae; dorsal carinae on segments I-V with strong spinoid granules forming serrulas; ventral carinae on segments I-V equally with strong spinoid granules; setation on segments I to V weak. Telson with a strongly bulbous vesicle and a long but moderately curved aculeus; globally weakly granular to smooth but with minor spinoid granulations on ventral carina; setation moderately marked. Cheliceral dentition not observed. Pedipalps moderately elongated; femur pentacarinate with some spinoid granules on internal face; patella with dorso-internal, ventro-internal, dorsoexternal, external and ventral carinae; two spinoid apophysis on internal face. Chela with moderately to weakly marked carinae; all faces weakly granular to smooth; internal face with some spinoid granules. Fixed and movable fingers with 7-8 series of moderate granules separated by stronger spinoid accessory granules; extremity of fingers with one stronger spinoid granule. Trichobothriotaxy:a trichobothrial pattern related to those of both buthoid and chaeriloids, types A and B can be observed (Vachon, 1974); for details see diagnosis. Leg tarsi with a few long and thin ventral setae. Long and sharped ungues. Pedal spurs present and weakly marked; tibial spurs absent.

Morphometric values (mm), holotype of Serratochaerilobuthus barbarae sp. n.

– Total length (including telson) 9.07.

– Carapace

length 1.27;

anterior width 0.94;

posterior width 1.34.

– Mesosoma length 2.14.

– Metasomal segments

I: length 0.54, width 0.74;

II: length 0.61, width 0.61;

III: length 0.61, depth 0.47;

IV: length 0.81, depth 0.54;

V: length 1.54, depth 0.54.

– Telson length 1.55.

– Vesicle depth 0.54.

– Pedipalp

femur: length 1.10, width 0.47;

patella: length 1.27, width 0.41;

chela: length 1.94, width 0.51;

movable finger length 1.14.

Relationships. – In account of the presence of serrulas on the metasomal carinae and the marked granulations on the pedipalp fingers, the new species can be placed in the genus Serratochaerilobuthus .

The new species represents the second one for this genus but can be distinguished from S. schmidti Lourenço, 2024 by a number of features:

(i) presence of maculae in the place of lateral eyes;

(ii) internal face of pedipalp femur without any apophysis;

(iii) anterior margin of carapace straight with a minor convexity;

(iv) presence of two extra trichobothria on the ventral face of chela.