Dichotomius (Luederwaldtinia) enioi, Montoya-Molina & Vaz-De, 2021

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 : 25-27

Dichotomius (Luederwaldtinia) enioi sp. nov.

urn:lsid:zoobank.org:act:E526BCF4-2B99-42E3-B18B-DC9FE1ED0D7B

Fig. 8 , Map 16

Diagnosis

Dichotomius enioi sp. nov. is separated from other species in the group by the following combination of characters: males interocular space microsculpture shagreened, with flat, well-defined punctures resembling rugosity. Median tubercle conical, twice as high as lateral, with fine apical emargination; lateral tubercles with acute apex. Row of dense uninterrupted ocellate punctures arrange along anterior and posterior margin of Pronotum.Anterior disc declivity with weak anteromedian lobe subemargination. Interstriae microsculpture shagreened.

Etymology

Dichotomius enioi sp. nov. is an eponym after Enio Cano, a Guatemalan scientist who contributes to the study of Scarabaeoidea .

Material examined

Holotype GUATEMALA • ♂; “ Petén, Flores, El Remate , Biot. Cerro Cahuí; 28-29 VII 1995; Col. E.B. Cano ” /“Bosque guamil alto, Colecta nocturna, con heces humanas” / “ Dichotomius agenor (Harold) , Det. E. Cano, 1996.” [white, p]; CEMT.

Paratypes

COSTA RICA – Guanacaste • 2 ♂♂, 2 ♀♀; Pq. Nac. Santa Rosa. Parnaud.; CEMT – Puntarenas • 1 ♂, 1 ♀; Est. Queb. Bonita , 50 m. Res. Biol. Carara L-N-194500; 469850; Jun. 1993; J.C. Saborío leg.; CEMT.

GUATEMALA – Petén • 1 ♂, 1 ♀; Flores, El Remate, Biot. Cerro Cahuí; 28–29 Jul. 1995; E.B. Cano leg.; CEMT • 1 ♀; Parque Nac. Tikal , área #1-B; 5–6 Sep. 1995; G. Orellana leg.; CEMT.

MEXICO – Campeche • 3 ♂♂, 2 ♀♀; Xpujil; 26 Jul. 1995; J.L. Moreno and T. Mestre leg.; CEMT .

Description

Male

MEASUREMENTS. Length: 21.47 mm. Dorsal and ventral surface black.

HEAD. Anterior surface rugose. Interocular surface microsculpture shagreened, with flat, well-defined punctures. Clypeus with central emargination separating two short, rounded clypeal teeth. Cephalic carina wider than high. Median tubercle twice as high as lateral tubercles, conical in shape and with fine apical emargination, lateral tubercles apical acute. Ventral clypeal process truncate (see Fig. 2B ).

PRONOTUM. Wider than long. Pronotal median disc shiny covered with simple well-impressed punctures, scattered dense uninterrupted ocellate punctures along anterior and posterior margins, absent in lateral margins ( Fig. 8A, C ). Anterior disc pronounced declivity with impressed longitudinal sulcus producing weak anteromedian lobe subemargination. Hypomeral disc smooth, external margin bearing multiple rows of disorganized long setae, approximately same length, (see Fig. 2E ).

ABDOMEN. Prosternum surface microsculpture shagreened. Mesosternum and metepisternum surface covered by large ocellate setigerous punctures. Metasternum setigerous punctures restricted to anterior and lateral edges of mestasternal lobe. Setigerous punctures connecting antero-median edge with lateral through margin of mesocoxa (see Fig. 2G ); lateral edge of metasternum with ocellate setigerous punctures separated by diameter of a puncture, setae reaching metepisternum suture. Sternite with ocellate punctures along anterior margins of each sternite, denser in lateral areas. Pygidium microsculpture shagreened with scattered well-impressed simple punctures; basal margin bearing row of ocellate punctures.

ELYTRA. Interstriae microsculpture shagreened ( Fig. 8C ). Striae with ocellate punctures separated by diameter of a puncture on elytral disc.

LEGS. Fore calcar spiniform, profemur surface covered by clearly impressed punctures ( Fig. 8D ); metacoxa posterior margin bearing row of organized ocellate setigerous punctures.

PARAMERES AND LAMELLA COPULATRIX. As in Fig. 8 E–G.

Morphological variation

Females ( Fig. 8B )

As males except for the following characters:

HEAD. Surface completely transversely rugose, denser on anterior portion. Cephalic carina quadridentate and greatly elevate, median tubercles higher than lateral.

PRONOTUM. Without medial declivity and sub-emargination, punctures dense and deeply impressed, separated between them by once the diameter of same.

ABDOMEN. Sternites lateral punctuation denser than in males. Pygidium surface punctation wider and denser than in males.

Remarks

It is possible that Kohlmann & Solis (1997) and López-Guerrero (2005) reported this species for Central America as Dichotomius agenor .

Figures

Fig. 8. Dichotomius enioi sp. nov. A–B. Dorsal habitus. A. Holotype, ♂ (CEMT). B. ♀. C. Lateral view of the aedeagus. D. Ocellate punctation of the posterior margin of the pronotum; elytral interstriae shagreened. E. Ventral view of the aedeagus. F–G. Lamella copulatrix. H. Profemur covered with wellimpressed punctures, setigerous setae near the medial edge.

Fig. 2. General characters that help differentiate the species of the Dichotomius (Luederwaldtinia) agenor species group. A–D. Ventral clypeal process. A. Cordate as in D. agenor (Harold, 1869). B. Truncate as in D. sagittarius (Harold, 1869) stat. rev. C. Bifurcate as in D. belus (Harold, 1880). D. Cylindrical as in D. henripittieri sp. nov. E–F. Hypomeral characters. E. Medial disc smooth, lateral margin with multiple rows of setae as in D. amplicollis (Harold, 1869). F. Medial disc punctate, lateral margin with single row of setae as in D. tristis (Luederwaldt, 1923). G–H. Metasternum characters. G. Setigerous punctures from the medial and lateral edges joining throughout the margin of the mesocaxa as in D. enioi sp. nov. H. Setigerous punctures from the medial and lateral edges not joining throughout the margin of the mesocaxa as in D. centralis (Harold, 1869). I–J. Elytra interstriae. I. Smooth as in D. amplicollis. J. Shagreened as in D. agenor.