Notomicrus meizon, Guimarães & Ferreira-Jr, 2019

Guimarães, Bruno A. C. & Ferreira-Jr, Nelson, 2019, Two new species and new records of Notomicrus Sharp, 1882 (Coleoptera: Noteridae) from Brazil, Zootaxa 4629 (2), pp. 263-270 : 264-265

Notomicrus meizon sp. nov.

( Figs 1 , 3a, 3 c–d, 3g–h, 3k)

Type locality. Brazil, Amazonas State , Jutaí Municipality , Rio Solimões, Lago do Bosco, 02º41’19.2” S 66º52’31.0” W .

Type material. Holotype ♂. “ BRAZIL, AMAZONAS STATE, Jutaí Municipality, Rio Solimões , Lago do Bosco , 02º41’19.2” S 66º52’31.0” W, black light, 06.IX.2003, Hamada N. & Nessimian J.L. leg.” ( INPA) . Paratypes. “ BRAZIL, AMAZONAS STATE, same data as holotype (22 ♂♂ 30 ♀♀ / INPA) ; “ Codajás Municipality, Urucuriz- inho, Lago Cuxuará , 03º58’16.4” S 61º57’38.3” W, black light, 15.IX.2003, Hamada N. & Nessimian J.L. leg.” (1 ♂ / DZRJ 6414 ) ; “ Fonte Boa Municipality, Rio Fonte Boa , Lago Ressaca Grande, black light, 02º28’26.4” S 66º09’17.1” W, 08.IX.2003, Hamada N. & Nessimian J.L. leg.” (81 ♂♂ 77 ♀♀ / DZRJ 7470 ) ; “ Manaus Municipal- ity, Arquipélago das Anavilhanas, Rio Negro , 19.IX.1981, Nessimian J.L. leg.” (1 ♂ / DZRJ 499 ) ; “ Santo Antônio do Içá Municipality, Rio Solimões , Vila Presidente Getúlio Vargas, Lago do Espanhol , 03º07’22.5” S 67º58’23.6” W, black light, 04.IX.2003, Hamada N. & Nessimian J.L. leg.” (8 ♂♂ 15 ♀♀ / DZRJ 6051 ) ; “ Tefé Municipality, Rio Solimões , São Francisco da Boca da Capivara , Barra do Solimões , 03º16’56.2” S 64º37’18.1” W, black light, 09.IX.2003, Hamada N. & Nessimian J.L. leg.” (9 ♂♂ 6 ♀♀ / DZRJ 6053 ) ; “ Rio Solimões, São Francisco da Boca da Capivara , igarapé, 03º21’39.6” S 64º40’44.9” W, 09.IX.2003, Hamada N. & Nessimian J.L. leg.” (4 ♂♂ 6 ♀♀ / DZRJ 6066 ) ; “ Rio Solimões , São Francisco da Boca da Capivara , Lago Botão, lake, 03º15’55.4” S 64º37’38.8” W, 09.IX.2003, Hamada N. & Nessimian J.L. leg.” (1 ♂ / DZRJ 6411 ) ; “ Rio Solimões , São João do Catuaí, Lago da Piranha, lake, 03º37’30.9” S 64º11’22.9” W, 11.IX.2003, Hamada N. & Nessimian J.L. leg.” (2 ♀♀ / DZRJ 6063 ).

Diagnosis. Notomicrus meizon sp. nov. can be distinguished from other species in the genus by the large size (TL = 1.60 –1.70 mm) and the characters of aedeagus ( Fig. 1b, d ).

Description. Holotype. Body outline, in dorsal view ( Fig. 1a ) elongated oval, broader anteriorly and attenuated posteriorly (TL/MW = 2.10); in lateral view, dorsally weakly convex and ventrally flat.

Measurements. TL = 1.60 mm; MW = 0.75 mm; TL/MW = 2.10.

Color ( Fig. 1a ). Head dorsally light brown and ventrally yellowish. Antennae yellowish. Pronotum yellowish. Elytra light brown with anterior margin near suture black. Metasternum and outer laminae of the metacoxae dark brown. Remaining of ventral surface yellowish.

Head. With fine microreticulation consisting of elongate cells in transverse direction. Antennae with apical antennomere elongate, length greater than total length of head, distally subserrate, antennomeres V–X expanded, antennomeres VI–IX longer than wide ( Fig. 3a ). Maxillary palp with apical palpomere elongate, length greater than half of total length of palp, distally attenuate, apex rounded, emarginated at apex, with two small sensory fields ( Fig. 3g ). Labial palp with apical palpomere elongate, expanded, length greater than twice the combined length of basal palpomeres, emarginated at apex, with two small sensory fields ( Fig. 3h ).

Thorax. Pronotum with fine microreticulation consisting of isodiametric cells, except along anterior margin, which are elongate. Elytra with fine weakly impressed microreticulation consisting of isodiametric cells, increasingly elongate posteriorly; distal half and lateral margins evenly covered with scattered setate punctures ( Fig. 3k ). Metasternum and noterid platform with impressed microreticulation consisting of oblong cells, increasingly elongate along suture. Noterid platform with lateral outline divergent posteriorly, with posterior margins oblique, apical lobes acutely rounded. Anterior protarsal claw longer than posterior one and longer than protarsomere V; in lateral view, wider at base than posterior one ( Fig. 3c ). Anterior mesotarsal claw slightly longer than posterior one and longer than mesotarsomere V; in lateral view, slightly wider at base than posterior one ( Fig. 3d ).

Aedeagus ( Fig. 1b – f ). Median lobe, in lateral aspect, slightly curved, sharply bent before apex, with small expansion on dorsal margin, apex truncate, expanded. Left lateral lobe broad and elongated, with short setae along dorsal margin. Right lateral lobe wide, subquadrate.

Female. Protarsal and mesotarsal claws similar, without any meaningful modification.

Variation. Measurements. TL = 1.60–1.70 mm, ♂ = 1.60–1.65 mm, ♀ = 1.60–1.70 mm; MW = 0.75–0.80 mm; TL/MW = 2.00–2.25.

Some specimens present lighter colored head, elytra, metasternum and outer laminae of the metacoxae.

Comparative notes. For the relative large size, Notomicrus meizon sp. nov. is comparable with N. traili and N. reticulatus Zimmermann, 1921 , known from Argentina and Uruguay, although N. meizon sp. nov. is even larger (TL = 1.60 –1.70 mm to both N. traili and N. reticulatus TL = 1.50 –1.60 mm, Sharp 1882; Young 1978; Zimmermann 1921). Externally, N. meizon sp. nov. can be distinguished from N. traili by the lighter colored head, elytra ( Fig. 1a ), metasternum and outer laminae of metacoxae and from N. reticulatus by the less impressed microreticulation on pronotum and elytra ( Young 1978). Internally, N. meizon sp. nov. can be distinguished from N. traili (Fig. 44 of Manuel 2015) by the shape of median lobe of aedeagus ( Fig. 1b, d ), whereas genitals of N. reticulatus are currently unknown.

Etymology. The specific name is the Greek adjective “ meizon ”, meaning larger. This is in reference to its generally larger size than that of the other Notomicrus species.

Geographic distribution. So far N. meizon sp. nov. is known only from the Brazilian state of Amazonas.

Figures

FIGURE 1. Notomicrus meizon sp. nov. a) dorsal view, b) median lobe of aedeagus, right lateral aspect, c) same, dorsal aspect, d) same, left lateral aspect, e) right lateral lobe of aedeagus, f) left lateral lobe of aedeagus.

FIGURE 3. Notomicrus appendages and dorsal view. a–b) left antenna; c, e) male left protarsal claw, anterior aspect; d, f) male left mesotarsal claw, anterior aspect; g, i) left maxillary palp, ventral aspect; h, j) left labial palp, ventral aspect; k–l) dorsal view, depicting distribution of setate punctuation; m) dorsal view. a, c–d, g–h, k) Notomicrus meizon sp. nov., b, e–f, i–j, l) Notomicrus teramnus sp. nov., m) Notomicrus traili, specimen from Amazonas.