Bombus richardsiellus ( Tkalců, 1968 ) (Tkalcu, 1968)

Williams, Paul H., Altanchimeg, Dorjsuren, Byvaltsev, Alexandr, Jonghe, Roland De, Jaffar, Saleem, Japoshvili, George, Kahono, Sih, Liang, Huan, Mei, Maurizio, Monfared, Alireza, Nidup, Tshering, Raina, Rifat, Ren, Zongxin, Thanoosing, Chawatat, Zhao, Yanhui & Orr, Michael C., 2020, Widespread polytypic species or complexes of local species? Revising bumblebees of the subgenus Melanobombus world-wide (Hymenoptera, Apidae, Bombus), European Journal of Taxonomy 719, pp. 1-120 : 60-61

publication ID

https://doi.org/10.5852/ejt.2020.719.1107

publication LSID

lsid:zoobank.org:pub:A4500016-C219-4353-B81C-5E0BB520547F

DOI

https://doi.org/10.5281/zenodo.4335582

persistent identifier

https://treatment.plazi.org/id/252087CA-1F79-9505-FDB1-FC96DE90FC79

treatment provided by

Valdenar

scientific name

Bombus richardsiellus ( Tkalců, 1968 )
status

 

Bombus richardsiellus ( Tkalců, 1968)

Figs 13 View Figs 12‒13 , 78–82 View Figs 64–102 , 189 View Figs 181‒189 , 205 View Figs 205–206

Pyrobombus richardsiellus Tkalců, 1968: 42.

Our PTP analysis ( Fig. 10 View Fig ) of coalescents in the COI gene within the rufofasciatus -group supports nine species including B. richardsiellus, corroborated by differences in morphology (see the Diagnosis).

Females show size-dependent dimorphism in the colour pattern of the hair: large queens have metasomal T1–3 black, T4 anteriorly black and posteriorly white, and T5 white; whereas large workers (which are smaller) have T1 with some yellow hair, T2 anteriorly with at least a few yellow hairs, T4 orange-red, and T5 anteriorly orange-red, T5 posteriorly and T6 (in part) white; and small workers have white hairs intermixed on the face and on the side of the thorax, T1–2 predominantly yellow, and T5 almost entirely orange. Males have the thoracic bands and T1–2 yellow, T3 black, and T4–5 orange-red.

Diagnosis

Females

Queens medium-sized body length 20–21 mm, workers 10–15 mm. Can be distinguished in the Hengduan region by their combination of the hair of the thoracic dorsum with white bands, T1 black or yellow, and T5 posteriorly white (cf. B. rufofasciatus, B. prshewalskyi, B. miniatus, B. friseanus, B. pyrosoma).

Males

Body length 12 mm. Can be distinguished by their combination of the thorax with yellow bands with the hair of T3 almost entirely black and without a yellow posterior fringe (cf. other rufofasciatus -group species). Genitalia ( Fig. 189 View Figs 181‒189 ) with the gonostylus much reduced, less than a quarter as long on its outer side as broad, with the distal edge concave, the inner distal corner with a single- or double-pointed projection, the inner proximal corner broad and nearly 90° (cf. B. miniatus, B. eurythorax, B. pyrosoma, B. formosellus); volsella with the inner distal corner produced as a narrow curved hook. The single examined male specimen (NHMUK) is missing its head, but according to Tkalců (1968) this male had eyes unenlarged relative to the female.

Material examined

Holotype

BURMA • ♀ (queen), holotype of Pyrobombus richardsiellus Tkalců, 1968 by original designation; Adung Valley ; 8 Jul. 1931; Lord Cranbrook (= J. Gathorne-Hardy) leg.; NHMUK (examined PW).

Material sequenced (3 specimens)

CHINA • 1 ♀ (worker); Xizang, Nyingchi ; 30.0054° N, 95.2936° E; 12 Aug. 2012; NHMUK seq: NHMCT1 (sequence data from Williams 2018); PW: ML2 GoogleMaps 1 ♀ (worker); Xizang, Galonglashan ; 29.8266° N, 95.71532° E; 25 Jul. 2018; Z. Ren leg.; KIB seq: GLLSL203007; KIB: ML563 GoogleMaps 1 ♀ (worker); Xizang, Sangjiu ; 28.8089° N, 97.6056° E; 31 Aug. 2014; IBK seq: BB09; IOZ: ML581 GoogleMaps .

Global distribution

(Hengduan mountain species) East Asia: CHINA: Xizang. – Southeast Asia: BURMA (north). ( IAR, IOZ, KIB, NHMUK, PW.) Until recently, the species was known from only five specimens (two queens, two workers, and one male), most from the Adung Valley, Burma, with one queen from Zayul, Xizang ( NHMUK, examined PW). Knowledge of this species has increased substantially recently with the collection of a queen and 14 workers from Sanjiu in Xizang in 2014 ( IOZ, examined PW) and a collection of 64 workers from Galonglashan in Xizang in 2018 ( KIB, examined PW), which brings the total known number of available specimens to 83. From this information, among bumblebee species with continental distributions, this species remains apparently unusually narrowly distributed ( Fig. 205 View Figs 205–206 ).

Behaviour

Food-plant choice generalist ( ZR unpublished).

NHMUK

Natural History Museum, London

PW

Paleontological Collections

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Apidae

Loc

Bombus richardsiellus ( Tkalců, 1968 )

Williams, Paul H., Altanchimeg, Dorjsuren, Byvaltsev, Alexandr, Jonghe, Roland De, Jaffar, Saleem, Japoshvili, George, Kahono, Sih, Liang, Huan, Mei, Maurizio, Monfared, Alireza, Nidup, Tshering, Raina, Rifat, Ren, Zongxin, Thanoosing, Chawatat, Zhao, Yanhui & Orr, Michael C. 2020
2020
Loc

Pyrobombus richardsiellus Tkalců, 1968: 42

Tkalcu B. 1968: 42
1968