Notomicrus teramnus, 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: 266-267

publication ID

https://doi.org/10.11646/zootaxa.4629.2.8

publication LSID

lsid:zoobank.org:pub:11D8445F-84A7-4CB0-A609-538CA729FF82

persistent identifier

http://treatment.plazi.org/id/66254C30-1961-0D0C-FF61-58E8FF0846BD

treatment provided by

Plazi

scientific name

Notomicrus teramnus
status

sp. nov.

Notomicrus teramnus   sp. nov.

( Figs 2 View FIGURE 2 , 3b, 3 View FIGURE 3 e–f, 3i–j, 3l)

Type locality. Brazil, Minas Gerais State, Caparaó Municipality, Parque Nacional do Caparaó, Cachoeira do Rogério   .

Type material. Holotype ♂. “ BRAZIL, MINAS GERAIS STATE, Caparaó Municipality, Parque Nacional do Caparaó, Cachoeira do Rogério , 24.III.2012, Jardim G.A. leg.” ( DZRJ 6541)   . Paratype. Same data as holotype (1 ♀ / DZRJ 6543)   .

Diagnosis. Notomicrus teramnus   sp. nov. can be distinguished from other species in the genus by the following characteristics: antennae with antennomeres VI–IX shorter than wide ( Fig. 3b View FIGURE 3 ); maxillary and labial last palpomere emarginated at apex, with two large sensory fields ( Figs 3i –j View FIGURE 3 ); elytra with indiscernible setal punctures beside discal rows and along lateral margins ( Fig. 3l View FIGURE 3 ); male anterior protarsal claw substantially wider at base than posterior one ( Fig. 3e View FIGURE 3 ); median and right lateral lobes of aedeagus very distinctive ( Fig. 2 View FIGURE 2 b–l).

Description. Holotype. Body outline, in dorsal view ( Fig. 2a View FIGURE 2 ) slightly elongated oval, broader anteriorly and attenuated posteriorly (TL/MW = 2.00); in lateral view, dorsally weakly convex and ventrally flat.

Measurements. TL = 1.30 mm; MW = 0.65 mm; TL/MW = 2.00.

Color ( Fig. 2a View FIGURE 2 ). Head dorsally dark brown and ventrally yellowish. Antennae yellowish. Pronotum yellowish. Elytra dark brown. Metasternum, outer laminae of the metacoxae and base of abdomen dark brown. Remaining of ventral surface yellowish.

Head. Head with fine microreticulation consisting of elongate cells in transverse direction. Antennae with apical antennomere elongate, length lesser than total length of head, distally subserrate, antennomeres V – X expanded, antennomeres VI–IX shorter than wide ( Fig. 3b View FIGURE 3 ). Maxillary palp with apical palpomere elongate, length greater than half of total length of palp, distally attenuate, apex rounded, emarginated at apex, with two large sensory fields ( Fig. 3i View FIGURE 3 ). Labial palp with apical palpomere elongate, expanded, length greater than twice the combined length of basal palpomeres, emarginated at apex, with two large sensory fields ( Fig. 3j View FIGURE 3 ).

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; indiscernible setal punctures beside discal rows and along lateral margins ( Fig. 3l View FIGURE 3 ). 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. Protarsal claws equal in length and shorter than protarsomere V; in lateral view, anterior claw substantially wider at base than posterior one ( Fig. 3e View FIGURE 3 ). Mesotarsal claws equal in length and shorter than mesotarsomere V; in lateral view, anterior claw slightly wider at base than posterior one ( Fig. 3f View FIGURE 3 ).

Aedeagus ( Fig. 2 View FIGURE 2 b–f). Median lobe, in dorsal aspect ( Fig. 2c View FIGURE 2 ), with two hooks on base ( Fig. 2g View FIGURE 2 ): a smaller one, extending to right side, bending proximally, and a larger one, extending to left side, bending distally, both originating near left apodeme ( Fig. 2h View FIGURE 2 ) and closing against surface of lobe; in lateral aspect ( Figs 2b, 2d View FIGURE 2 ), with a dorsal projection ( Fig. 2j View FIGURE 2 ) distally truncate, originating from lobe midlength, and two short ridges, in addition to the medial spermathic ridge ( Fig. 2i View FIGURE 2 ), on left side ( Fig. 2d View FIGURE 2 ): a curved one ( Fig. 2l View FIGURE 2 ), extending from dorsal projection apex to three-fourths of lobe, and a straight one, arising from base to dorsal projection ( Fig. 2k View FIGURE 2 ); apical region of median lobe gradually sharpening and culminating in a rounded and twisted apex. Left lateral lobe ( Fig. 2e View FIGURE 2 ) broad and elongated, setate along dorsal margin, setae long. Right lateral lobe ( Fig. 2f View FIGURE 2 ) small and oval.

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

Variation. Measurements. TL = 1.30 mm; MW = 0.62 mm; TL/MW = 2.10.

Due to the scarceness of specimens available, it is not possible to assess intraspecific variation.

Comparative notes. Notomicrus teramnus   sp. nov. has a peculiar aedeagal morphology ( Fig. 2 View FIGURE 2 b–f) that distinguishes this species from any other known Notomicrus   . For the relative small size, the new species looks similar to N. brevicornis   and N. gracilipes   but is distinguished from these by the darker head, elytra ( Fig. 2a View FIGURE 2 ), metasternum, outer laminae of the metacoxae and base of abdomen; by the antennae with antennomeres VI–IX shorter than wide ( Fig. 3b View FIGURE 3 ); by the maxillary and labial apical palpomeres emarginated, with two large sensory fields ( Figs 3 View FIGURE 3 i–j); by the elytra with indiscernible setate punctures beside discal rows and along lateral margins ( Fig. 3l View FIGURE 3 ) and by the shape of male protarsal claws ( Fig. 3e View FIGURE 3 ). Notomicrus teramnus   sp. nov. can be distinguished from N. gracilipes   also by the smaller size (TL = 1.30 mm to N. gracilipes   : TL = 1.35–1.45 mm, Sharp 1882; Young 1978).

Biological note. As well as N. petrareptans Baca & Short, 2018   , N. teramnus   sp. nov. was collected in hygropetric habitat; however, as few specimens were obtained, it isn’t possible to verify that N. teramnus   sp. nov. is, as N. petrareptans   , strictly associated with these habitats. The specimens were collected in fillets of water on rocks, near the margin of a stream, along with specimens of Torridincolidae   .

Etymology. The specific name is the Greek adjective “ teramnus   ”, meaning tender. This is in reference to its smooth elytra and delicate appearance.

Geographic distribution. So far N. teramnus   sp. nov. is known only from the Brazilian state of Minas Gerais.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Noteridae

Genus

Notomicrus