genus Bolbohamatum: Insects (Insecta) Taxonomy. Bolboceratine scarabs of genera Bolbohamatum Krikken, and Bolbogonium Boucomont, (Coleoptera: Geotrupidae) from central. Bolboceratine scarabs of genera Bolbohamatum Krikken, and Bolbogonium Boucomont, (Coleoptera: Geotrupidae) from central India. Published on.
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The pronotal ornamentation and external male genitalia of Bolbohamatum species has been diagnosed with the 9180 of an identification key to the species from Central India.
A checklist containing 19 Indian species of both genera Bolbohamatum and Bolbogonium has also been prepared with their distribution in different states of India as well as outside of India.
Introduction Bolboceratine scarabs in the family Geotrupidae are commonly called Earth-boring dung beetles because adults of most species provision larvae in earthen burrows with dead leaves, cow dung, horse dung, or humus. The first comprehensive study of Kfikken Bolboceratinae was carried out by Westwood, which considered 29 species to be in one genus Bolboceras.
Later, several new species names were added based on the materials from tropical and eastern Asia. Boucomont proposed Bolbogonium as a subgenus for Bolboceras. A series of taxonomic publications on Asian Bolboceratinae were then made by Krikken ab, ab,Carpaneto et al.
Krikken a,b raised the subgenus Bolbogonium to the genus level and described seven new species, kriikken with producing a key to all ten Asian species.
Subsequently, Krikken proposed the genus Bolbohamatum for four species to be combined with Bolboceras, while also describing nine new species and discussing the significance of external male genitalia and pronotal ornamentation in the accurate identification of the various species. Recently, Karl et al. The present study includes taxonomic information for four species of Bolbohamatum and one species of Bolbogonium from the Madhya Pradesh and Chhattisgarh states in India and also incorporates new distributional records of these beetles.
A checklist of both genera from India is included. Materials and methods Specimens for the study were collected using light trap from various protected areas by scientific teams of ZSI based in Jabalpur, Madhya Pradesh.
Pinned specimens were identified with the help of available taxonomic revisions of the studied genera Krikken, b, Specimens were examined under a binocular microscope Leica M A and photographs were taken with the help of an attached digital camera. Male specimens were dissected, with the abdomen separated from the body and the aedeagus extracted from the abdomen.
The details of specimens examined, registration number of specimens, distribution inside and outside India, main diagnostic characters, description, illustration of external male genitalia, and identification key to the species level within the genus Bolbohamatum are provided. The classification adopted in the article is after Smith Results and Discussion Four species of the genus Bolbohamatum; B.
The identification of these species is based on the structure of external male genitalia, pronotal ornamentation and clypeal dentations, which are shown in figures 1 to 9. Bolbogonium insidiosum shows variations in the structure of clypeofrons Fig.
The checklist for 19 Indian species of both Bolbohamatum 11 species and Bolbogonium 8 speciesalong with their distribution within and outside of India, are provided in Table 1. Geotrupidae Latreille, Subfamily: Bolboceratinae Mulsant, Tribe: Scarabaeus cyclops Olivier, It likely evolved on the Indian subcontinent and spread at a relatively late stage through Myanmar into Sundaland and China Krikken, Metasternum anterroiorly always with a small spiniform protrusion and with anterior lobe narrowly separating middle coxae.
Head of males with a pair of tubercles on clypeus.
Bolbohamatum meridionale Krikken, 1980
Pronotum in case of male possess median and lateral protrusions with the surface between krimken usually concave. Fore tibia with external denticles. Lateral tubercles of pronotum well developed but not marginally situated. Apex of parameres not with reflexed paramerites Lateral tubercles of pronotum well developed or completely reduced or absent if present then marginally situated.
Apex of parameres dorsally with short reflexed paramerites Dorsally the parameres moderately sclerotized, relatively narrow and with poorly developed paramerite. Ventral side of parameres devoid of distinct jrikken. Basal capsule relatively narrow Bolbohamatum calanus Dorsally the parameres foliate and ventrally with a pair of more or less glider-like paramerites.
Basal capsule in lateral view distally strongly emarginated Bolbohamatum phallosum 3. Paramedian tubercles of pronotum closely approximated and separated by less than to interocular distance kdikken lateral tubercles well developed and marginally situated Bolbohamatum marginale Paramedian tubercles of pronotum not closely approximated and separated by more than inter-ocular distance while lateral tubercles absent.
Bolbohamatum laterale Bolbohamatum calanus Westwood, Bolboceras calanus Westwood, a: Bolboceras tumidulus Westwood, Bolbohamatum calanus Krikken, Chandra, 13 June Diagnosis: Brown, shiny and pilosity yellow brown. Cephalic tubercles more or less dentiform, isolated and placed simply on clypeal disc. Dorsal outline of left mandible sinuate lobate.
Pronotum with a pair of feebly developed, slightly transverse median tubercles with lateral callosities. Pronotum abundantly punctate, but never densely punctate throughout. Paramedian tubercles separated by less than inter-ocular distance.
Lateral impression of pronotum shallow. Basal capsule relatively narrow. New state and district record: Madhya Pradesh, Maharashtra and East India. Madhya Pradesh Irikken and Mandla. Clypeus with a pair of dentiform tubercles. Pronotum with closely approximated paramedian tubercles and lateral protrusion not krrikken to antero-lateral corner.
Juxtasutural punctures of elytra sub obsolete and discal striae shallowly impressed and finely punctate. Elytral inter-striae very slightly convex and minutely and sparsely punctured. In lateral Figure 3: Dorsal outline of left mandible lobate.
Clypeus with a pair of dentiform tubercles each placed against lateral margin. Pronotum with strongly approximated paramedian tubercles and a pair of lateral tubercles situated almost marginally. Median longitudinal zone and lateral declivities of pronotum densely and coarsely krilken while impression between paramedian and lateral tubercles virtually devoid of punctures and opaque.
Krikkej tibia with seven external denticles. The species can be easily distinguished from its krikkfn relatives in having pronotal lateral tubercles situated almost marginally and very closely approximated paramedian tubercle. Chhattisgarh Bilaspur and Madhya Pradesh Mandla. Bolbohamatum laterale Westwood, Bolboceras lateralis Westwood, Bolbohamatum laterale, Krikken, Harshay, 16 September ; day collection.
Paramedian tubercles of pronotum well separated by more than inter ocular distance. Lateral tubercles almost absent. Median cavity of pronotal disc absent. Punctation on pronotal disc abundant. Front tibia with eight denticles. Basal capsule of the phallus very robust in comparison to B.
Basal capsule of phallus is robust but not too much extant as of B. The species can be easily distinguished from its close members, B.
U shaped, sparsely punctate impression. Pronotum with anterior declivity impressed and punctation generally 19880. Elytral striae deeply impressed well defined and with large punctures. Elytral stria two extending further caudad. Front tibia with denticles. The species shows variation in the shape of clypeus, ornamentation of frons and vertex. Bolboceras triangulum Westwood, Middle coxae widely separated by an anterior lobe of pyriform metasternal disc.
First antennal club segment on proximal side shiny and glabrous distinctly separated from surrounding pubescent surface. Seven elytral striae between elytral suture and humeral umbone and all virtually reaching base. Bolbogonium insidiosum Krikken, Bolbogonium insidiosum Krikken, Clypeal surface regulate punctate. Frons with three small isolated tubercles between eye-canthi.
Vertex with large Figure 9: Venkataraman Director, ZSI for providing necessary facilities and encouragement. Literature cited Boucomont, A. Catalogue of the Palaearctic Coleoptera – 3. Apollo Books, Stentrup, Denmark: The genus Bolbelasmus Boucomont in Asia, with notes on species occurring in other regions Coleoptera: Zoologische Mededelingen, 51 Asian bolboceratine scarabs of the genus Bolbogonium Boucomont Coleoptera-GeotrupidaeTijdschrift voor Entomologie, 3: Taxonomic notes on Bolboceras indicum Westwood and its relatives Coleoptera: Entomologische Berichten Amsterdam,