Introduction

Materials and methods

Taxon treatment

Bolbelasmus (Kolbeus) guangdongensis Liao & Wu, sp. nov.

• ZooBank E75064F8-11D7-42EB-BC0D-4EBB487F99E7

Materials   Download as CSV 

Holotype:

1. kingdom:
   Animalia
   ; phylum:
   Arthropoda
   ; class:
   Insecta
   ; order:
   Coleoptera
   ; family:
   Geotrupidae
   ; taxonRank:
   species
   ; genus:
   Bolbelasmus
   ; subgenus:
   Kolbeus
   ; specificEpithet:
   guangdongensis
   ; country:
   China
   ; countryCode:
   CN
   ; stateProvince:
   Guangdong
   ; county:
   Zhanjiang
   ; locality:
   Huguangyan National Geopark
   ; verbatimElevation:
   26 m
   ; verbatimLatitude:
   21.13916 N
   ; verbatimLongitude:
   110.28635 E
   ; individualCount:
   1
   ; sex:
   male
   ; lifeStage:
   adult
   ; preparations:
   whole animal
   ; disposition:
   in collection
   ; identifiedBy:
   Liao wei-qi, Wu zheng-wei
   ; language:
   en
   ; basisOfRecord:
   PreservedSpecimen
   ; occurrenceID:
   9BB93E1A-84F7-5623-AA5F-03D9508A752A

Paratype:

1. kingdom:
   Animalia
   ; phylum:
   Arthropoda
   ; class:
   Insecta
   ; order:
   Coleoptera
   ; family:
   Geotrupidae
   ; taxonRank:
   species
   ; genus:
   Bolbelasmus
   ; subgenus:
   Kolbeus
   ; specificEpithet:
   guangdongensis
   ; country:
   China
   ; countryCode:
   CN
   ; stateProvince:
   Guangdong
   ; county:
   Zhanjiang
   ; locality:
   Huguangyan National Geopark
   ; verbatimElevation:
   26 m
   ; verbatimLatitude:
   21.13916 N
   ; verbatimLongitude:
   110.28635 E
   ; individualCount:
   2
   ; sex:
   1 female, 1 male
   ; lifeStage:
   adult
   ; preparations:
   whole animal
   ; disposition:
   in collection
   ; identifiedBy:
   Liao wei-qi, Wu zheng-wei
   ; language:
   en
   ; basisOfRecord:
   PreservedSpecimen
   ; occurrenceID:
   08BF84F3-2B92-56A9-942C-037EB86557A8

Description

Male: Body length 9.5 mm, maximum width 6.8 mm. Form ovate, sides parallel (Fig. 1A). Colour: dorsum reddish-brown, glossy (Fig. 1A and C-D). Head: covered with punctures evenly distributed, except on the mandible (Fig. 2). Labrum slightly convex on both sides of the anterior margin, notched on lateral margins, surface rugulate-punctate (Fig. 2). Clypeus trapezoidal, protrusion at basal angle (Fig. 2). Clypeofrontal suture clear, slightly curved, adjacent to the frontal punctate augmentation. Ocular canthi rounded, encircling the eye incompletely, surface rugulate-punctate (Fig. 2). Antennae form lamellalate, orange (Fig. 2). Pronotum: disc maxiumum width approximately 0.7x as long as body length, anteriorly concave, anterolateral pronotal process rounded, inconspicuous (Fig. 1A); posterolateral pronotal process transverse, forming a ridge (Fig. 1A and C). Surface coarsely punctured, banded across the disc, concentrated on the lateral margins, extending towards the middle, gradually thinning out (Fig. 1A and C). Basal fovea conspicuous (Fig. 1C). Scutellum: elongate, approximately 0.74x as wide as long, the lateral margins anteriorly are nearly parallel, posteriorly forming a pinched, sharp angle; surface with scattered nearly invisible punctures (Fig. 1A). Elytron: semispherical, elytral sutural intervals distinctly convex, thirteen punctate striae distributed on each elytron, uniformly distributed transversely (Fig. 1A and C). Male genitalia: small，length 1.2 mm, capsule like (Fig. 3A-C). Phallobase approximately 2.6x as long as paramere; ventral side evenly sclerotised, with two bands, dorsal side weakly sclerotic, membranous (Fig. 3B-C). Parameres diverging from each other, subtrapezoidal in shape; basal expansion and lateral margin strongly sclerotised, curving ventrally in a hook-like fashion (Fig. 3A-C). Median lobe: evenly sclerotised, trilobed, ventral apical part with a half-circular opening (Fig. 3B-C).

Figure 1.  

Bolbelasmus guangdongensis sp. nov. A holotype male, dorsal view; B paratype female, dorsal view; C holotype, left fronto-lateral view; D holotype, left lateral view. Scale bars: 2 mm.

Figure 2.  

Head of Bolbelasmus guangdongensis sp. nov., holotype male, dorsal view. Scale bars: 1 mm.

Figure 3.  

Male genitalia of Bolbelasmus guangdongensis sp. nov., holotype. A right lateral view; B dorsal view; C ventral view. Scale bars: 500 μm.

Female: length 9.7 mm; maximum width 7.7 mm. Similar to the male, except that the frontal punctate augmentation of the head is replaced by a transverse punctate ridge (Fig. 1B).

Diagnosis

Bolbelasmus guangdongensis sp. nov. belongs to the subgenus Kolbeus by pronotal base imarginate (marginate in Bolbelasmus) and scutellum elongate (usually short in Bolbelasmus) (Krikken 1977). This new species resembles Bolbelasmus coreanus, (Kolbe, 1886) (from Korea and China (Krikken 1977, Li et al. 2008)); Bolbelasmus meridionalis Krikkeni Nikolajev, 1979 (from Indonesia, Thailand, China and Vietnam (Krikken 1977) and Bolbelasmus chifengi Wang & Li, 2024 (from China (Li and Wang 2024)) in the body longer, 9 mm (Krikken 1977, Li et al. 2008, Li and Wang 2024) and the frontal tubercle located in junction of clypeofrontal suture (Li and Wang 2024). Their diagnostic characters are summarised in Table 1.

Table 1.

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XLSX

Diagnostic characters to differentiate B. guangdongensis sp. nov., B. coreanus, B. meridionalis and B. chifengi

	B. guangdongensis sp. nov.	B. coreanus	B. meridionalis	B. chifengi
Labrum outer edge	Notched (Fig. 2).	Smooth, widely rounded (fig. 2 in Krikken (1977)).	Smooth, widely rounded (Krikken 1977).	Crenulated (Li and Wang 2024).
Elytral sutural intervals	Distinctly convex (Fig. 1A).	Flat (fig. 28 in Li and Wang (2024)).	Distinctly convex (Li and Wang 2024).	Distinclty convex (Li and Wang 2024).
Parameres	Significantly shorter than the phallobase, diverged, subtrapezoidal shaped, tip rounded (Fig. 3A-C).	Almost as long as phallobase, diverged, irregularly-shaped, tip acute (figs. 11 and 12 in Li et al. (2008)).	Significantly shorter than the phallobase, subparallel, subtrapezoidal-shaped, tip acute (figs. 33 and 34 in Li and Wang (2024)).	Almost as long as phallobase, diverged, irregularly-shaped, tip rounded (figs. 31 and 32 in Li and Wang (2024)).
Medium lobe	Elongate, tip tapered, nearly level with the apex of parameres (Fig. 3B-C).	Stout, covered in parameres (figs. 11 and 12 in Li et al. (2008)).	Covered by parameres (figs. 33 and 34 in Li and Wang (2024)).	Elongate; broad at the tip, nearly level with the apex of the parameres (figs. 31 and 32 in Li and Wang (2024)).

Etymology

The new species is named after the place where it was collected.

Distribution

Guangdong Province, China.

Analysis

Discussion

Acknowledgements

References

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Supplementary material