Quititinus parvulus ( Krikken, 1981 ), 2025

Rodrigues, Diego F., Grossi, Paschoal C. & Vaz-de-Mello, Fernando Z., 2025, Taxonomic revision of Cremastocheilini (Coleoptera: Scarabaeidae: Cetoniinae) from South America and an updated key for the genera of the New World, Journal of Natural History 59 (17 - 20), pp. 1063-1125 : 1112-1115

Quititinus parvulus ( Krikken, 1981) comb. n.

( Figures 28 , 30 , 31 (F-G, I-J))

Genuchinus parvulus Krikken, 1981, p. 414 (original combination)

Genuchinus moroni Martínez, 1992: 40 (new junior subjective synomym) Taxonomic history

Krikken 1981, p. 414 (original description). – Martínez 1992: 40 (description). – Krajčik 1999: 42 (catalogue). – Di Iorio 2013 (catalogue, appendix). – Rodrigues et al. 2023 (catalogue). – Schoolmeesters 2024 (catalogue).

Diagnosis

Quititinus parvulus is recognised by the following combination of characters: Elytra surface is irregular, with ocellate punctures surrounded by elevations and lateral punctures ( Figure 28 (A, E, F)), with short setae.

Redescription

Male. Size: length: 7– 6.5 mm; width: 3.5– 2.6 mm. Body: Elongate, applanate dorsally, very flattened. Head: Clypeus evenly arched in frontal view, weakly bent upwards; clypeolateral declivity with rounded corners, the lateral transition of the clypeus gradually sloping. Frons almost flat, ocellate-punctate and/or differently punctate, with whitish velutinous spots on the surface. Antegenal protusion evident, eye-canthus superficially punctate; scape semitriangular; mentum circular, superficially punctate. Pronotum: Anterior margin concave and posterior margin convex; lateral margin rounded, wider anteriorly, wider centrally, and narrow posteriorly, forming a short callus at the angle connecting to the posterior margin. Annulate punctation fine, abundant but scattered; punctures are ocellate-punctate. Elytra: Disc elongate and evenly rounded, with one short anteapical umbone in each elytron and a shallow posthumeral emargination. Surface irregular, glossy with ocellate punctures and lateral punctures ( Figure 28 (A, E)), with short setae. Velutinous spots arranged on each elytron as follows: inconspicuous lateral point on the anterior half, behind the humeral tubercle; median spot near the suture; two or three spots in the distal third; one or two spots medially and in front of the distal callus; and another irregular spot near the distal edge, behind the callus. Thoracic venter: Mesepimeron: Ocellate-punctate and occasionally rugose, barely visible dorsally. Metaventrite: Slightly punctate centrally, ocellate-punctate laterally, with whitish velutinous spots. Legs: Mesotibia shorter than metatibia, both dorsally flattened and differently punctate, ventrally differently punctate, with two pairs of apical teeth and one proximal tooth. A superficially rugose concavity is present between the proximal tooth and one of the apical pairs; two apical spurs ( Figure 28 (D)); with short setae. Abdomen: Ventrites ocellate-punctate and slightly punctate; fifth ventrite concave anteriorly, virtually sunken ( Figures 28 (B)). Aedeagus: Parameres curved, wide until thin at the apex, with a large central membranous portion ( Figure 28 (G, H)).

Sexual dimorphism

Males with a concave abdomen, distinctly seen on the first four ventrites.

Geographical distribution

Quititinus parvulus is known from Brazil, in the biogeographical provinces of Araucaria Forest, Atlantic Forest, and Paraná ( Figure 30 ).

Natural history

Collected on the trunk under Vriesea sp. ( Bromeliaceae ). The pupal chamber is made by faeces of the larva itself ( Figure 28 (I)). One specimen was captured during the afternoon hours, flying at low altitude and inside the jungle ( Martínez 1992).

Remarks

In the original description, the total length is 9 mm.

Type specimens examined (n = 2)

Holotype of Genuchinus parvulus : ( Figure 31 (F, I)) Labels [1: printed text on yellow label] ‘Hansa Humboldt Sta. Catharina Brasillen Reitter’/[2: handwritten and printed text on white label] ‘ Genuchinus parvulus sp.n. J. Krikken ms 1980 hOLOTYPE’/[3: printed text on red label] ‘Type’/[4: printed text on white label] ‘RMNH.INS 1486073’ (1 ♀ at RMNH).

Holotype of Genuchinus moroni : ( Figure 31 (G, J)) Labels [1: handwritten text on white label] ‘ Brasil, E° de Minas Gerais, Caratinga, Alvarenga y Martínez , Coll Martínez Dic. [1] 980’/[2: handwritten text on red label] ‘HOLITIPO’/[3: handwritten text on red label] ‘ Genuchinus ♀ moroni sp. nov. A.Martínez Det. 1980’/[4: printed text on white label] ‘MACN-En 1311’ (1 ♀ at MACN).

Non-type specimens examined (n = 9)

BRAZIL (9): Rio de Janeiro: Parque Nac . [National Park] Itatiaia , 700 m, 5–25 .xii .1974, H. S. and M.A. Monné (1 ♀ CEMT 0192404 ); Nova Friburgo , − 22.281°S, − 42.512°W, 1050 m, xii .2014– i .2015, P .C . Grossi leg . (1 CERPE 000008 ); Nova Friburgo , − 22.281°S, − 42.512°W, 1050 m, ix .2017, P. Grossi and D . Parizotto (1 ♀ CERPE); Rio de Janeiro, Corcovado, 1 . x .1953, D. Zajciw (1 ♂ CEMT 00192403 ) . São Paulo: Salesópolis, EstaÇão Biológica Boracéia , Tronco embaixo de Vriesea sp . 26.xi .2008 , Grossi and Parizotto (1 CEMT 00192405 , 2 ♂ 2 ♀ CERPE).

Figures

Figure 28. Quititinus parvulus (Krikken, 1981) comb. n. Male at CERPE (Brazil, São Paulo, Salesópolis). (A) Habitus, dorsal view. (B) Habitus, ventral view. (C) Pronotum, dorsal view. (D) Protibia, dorsal view. (E) Habitus, dorsolateral view. (F) Habitus, lateral view. (G) Aedeagus, lateral view. (H) Parameres, dorsal view. (I) Pupal chamber. Scale bars = 1 mm.

Figure 30. Geographical distribution map of Quititinus parvulus (Krikken, 1981) comb. n. and Quititinus sulcippenis (Westwood, 1874) comb. n. ‘?’ indicates the exact locality is not known.

Figure 31. (A) Habitus of holotype of Cyclidinus velutinus Westwood, 1874 at MNHN. (B) Habitus and labels of holotype of Cyclidinus lugubris Westwood, 1874 at MNHN. (C) Habitus of holotype of Genuchinus muzo Krikken, 1981 at MNHN. (D) Labels of holotype of Cyclidinus velutinus. (E) Labels of holotype of Genuchinus muzo. (F) Habitus of holotype of Genuchinus parvulus Krikken, 1881 at RMNH. (G) Habitus of holotype of Genuchinus Moroni Martínez, 1992 at MACN. (H) Habitus of holotype of Genuchinus sulcipennis Westwood, 1874 at MNHN. (I) Labels of holotype of Genuchinus parvulus. (J) Labels of holotype of Genuchinus moroni. (K) Labels of holotype of Genuchinus sulcipennis.