Dichotomius (Luederwaldtinia) simplicicornis ( Luederwaldt, 1935 ),

Montoya-Molina, Santiago & Vaz-De, Fernando Z., 2021, Taxonomic review of the Dichotomius (Luederwaldtinia) agenor species group (Coleoptera: Scarabaeidae: Scarabaeinae), European Journal of Taxonomy 734, pp. 1-64: 42-44

publication ID

https://doi.org/10.5852/ejt.2021.734.1233

publication LSID

lsid:zoobank.org:pub:663A0C2D-E3CF-4B0C-8BA1-566B174829A2

DOI

http://doi.org/10.5281/zenodo.4545859

persistent identifier

http://treatment.plazi.org/id/03850669-FFB9-FFE5-FE2A-274D39D4CFB0

treatment provided by

Plazi

scientific name

Dichotomius (Luederwaldtinia) simplicicornis ( Luederwaldt, 1935 )
status

 

Dichotomius (Luederwaldtinia) simplicicornis ( Luederwaldt, 1935)  Fig. 14View Fig, Map 12

Pinotus simplicicornis Luederwaldt, 1935: 340  (original description).

Pinotus simplicicornis  – Blackwelder 1944: 208.

Dichotomius simplicicornis  – Ratcliffe et al. 2015: 197. — Chamorro et al. 2018: 95; 2019: 132 View Cited Treatment .

Diagnosis

Dichotomius simplicicornis  is separated from other species in the group by the following combination of characters: cephalic carina median tubercle higher than lateral ones, apically rounded and emarginate. Lateral tubercles short with acute on apex. Ventral clypeal process conical apically acute. Pronotum medial edge of the anterior disc declivity deeper than lateral sides, resembling two underdeveloped lobes. Elytral striae well marked, punctuation same width of striae; interstriae smooth.

Material examined

Lectotype (head and pronotum, here designated)

PERU • ♂; “Peru” [white, hw]/ “ Pinotus simplicicornis  n. sp. Lueder. Det. 1934” [white, hw]/ “Fry Coll. 1905-100” [white, p]/ “34600” [white, hw]/ “ HOLOTYPE ” [red with black margins, p]; BMNH. 

Additional material

PERU • 8 ♂♂, 4 ♀♀; Junín, Pichinaqui, Yaroni ; 2 Apr. 2006; A. Santibáñez leg.; CEMT  .

Redescription

Male

MEASUREMENTS. Length: 20.17 mm.

HEAD. Anterior third surface transversely rugose, extending posteriorly not reaching base of cephalic carina. Interocular space smooth, with scattered deep punctures ( Fig. 14View Fig C–D). Clypeal margin with large medial emargination separating two rounded clypeal teeth feebly angled upwards. Cephalic carina, wider than high and conical in shape ( Fig. 14DView Fig). Median tubercle three times as high as lateral tubercles, apically rounded and emarginate. Lateral tubercles short and acute on apex ( Fig. 14CView Fig). Ventral clypeal process conical in shape and apically acute.

PRONOTUM. Twice as wide as it is long, wider than elytra. Pronotal disc shiny and with well-impressed simple punctures, larger punctures on anterolateral edges and near posterior basal central margin.Anterior disc with sharp declivity, medial portion deeper than lateral sides, resembling two underdeveloped lobes ( Fig. 14A, DView Fig). Hypomeron medial disc smooth and shiny, external margin bearing rows of disorganized setigerous punctures, setae all approximately of same length (see Fig. 2EView Fig).

ABDOMEN. Prosternum surface shagreened, with scattered ocellate setigerous punctures. Mesosternum and metepisternum surface shagreened, with large ocellate setigerous punctures, separated by less than twice diameter of a puncture. Metasternum anterior surface and margins of mesocoxa microsculpture shagreened, covered by dense long setae that surrounds the margins of mesocoxa, joining the anteromedial with lateral portions of metasternum (see Fig. 2GView Fig). Longitudinal sulcus distinctly sculpted, ending as shallow mid-fossa. Sternites with ocellate punctures along anterior margins. Pygidium delimited by incomplete margin, faded apically, large punctures restricted to basal margin, medial and apical surfaces finely punctate.

ELYTRA. Shiny, wider than long. Striae distinctly punctate separated by two times diameter of a puncture on elytral disc; punctures same width of striae. Interstriae smooth with conspicuous randomly arranged punctures.

LEGS. Metacoxa microsculpture shagreened, posterior edge covered by row of dense setigerous punctures separated by less than diameter of a puncture, setae dense. In ventral view, profemora surface with scattered well-imprinted punctation, setigerous punctation restricted to medial edge.

PARAMERES AND LAMELLA COPULATRIX. See Fig. 14View Fig E–G.

Morphological variation

Females ( Fig. 14BView Fig)

As males except for the following characters:

HEAD. Surface completely rugose. Space between clypeal teeth less separated than in males. Genae border protruding clypeal margin. Fronto-clypeal carina bituberculate.

PRONOTUM. Narrower than elytra, gibbous.

ELYTRA. Twice as long as pronotum with shagreened microsculpture.

Remarks

The holotype has the first half of the body (head and pronotum) of a male and the second half (abdomen) of a female. As the ICZN states in Article 73.1.5 “ If a subsequent author finds that a holotype which consists of a set of components (e.g. disarticulated body parts) is not derived from an individual animal, the extraneous components may, by appropriate citation, be excluded from the holotype (material may be excluded from a hapantotype if it is found to contain components representing more than one taxon ”; therefore, we here designate the head and the pronotum as lectotype. Endemic species from Peru and individuals cited by Chamorro et al. (2018: 95, 2019: 132) from Ecuador were the rare species Dichotomius foveicollis (Kirsch, 1871)  .

BMNH

United Kingdom, London, The Natural History Museum [formerly British Museum (Natural History)]

CEMT

CEMT

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Scarabaeidae

Genus

Dichotomius

Loc

Dichotomius (Luederwaldtinia) simplicicornis ( Luederwaldt, 1935 )

Montoya-Molina, Santiago & Vaz-De, Fernando Z. 2021
2021
Loc

Dichotomius simplicicornis

Chamorro W. & Marin-Armijos D. & Asenjo A. & Vaz-De-Mello F. Z. 2019: 132
Chamorro W. & Marin-Armijos D. & Granda V. & Vaz-de-Mello F. Z. 2018: 95
Ratcliffe B. C. & Jameson M. L. & Figueroa L. & Cave R. V. & Paulsen M. L. 2015: 197
2015
Loc

Pinotus simplicicornis

Blackwelder R. E. 1944: 208
1944
Loc

Pinotus simplicicornis

Luederwaldt H. 1935: 340
1935