Probolomyrmex lamellatus, Oliveira & Feitosa, 2019

Oliveira, Aline M. & Feitosa, Rodrigo M., 2019, Taxonomic revision of the genus Probolomyrmex Mayr, 1901 (Hymenoptera: Formicidae: Proceratiinae) for the Neotropical Region, Zootaxa 4614 (1), pp. 61-94: 86-88

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Probolomyrmex lamellatus

New species

Probolomyrmex lamellatus   New species

( Figs. 24 View FIGURE 24 , 25 View FIGURE 25 )

Holotype: BRAZIL: Pará: Terra Santa, FLONA, Saracá-Taquera, Base Patauá , 1°51’27.23”S 56°27’48.4”W, 70m, 25–29.viii.2016, R.M. Feitosa, E.Z. Albuquerque, R. Silva col, Winkler (worker) [ DZUP, unique specimen identifier DZUP 549767 View Materials ]. GoogleMaps  

Diagnosis: Propodeum and petiole entirely emarginated posteriorly by a conspicuous lamella, without teeth. Postero-ventral lobe of petiole short and subquadrate. Subpetiolar process weakly developed. Prora weekly developed and dorsal protuberance on the posterior region of the first gastral tergite weakly developed.

Worker measurements: (n=1) HL 0.50; HW 0.30; SL 0.30; WL 0.59; PL 0.30; PW 0.24; PH 0.20; TL 2.11; CI 59.3; SI 59.3; PI 78.5.

Worker description: Frontoclypeal shelflike projection micropunctate; mandibles foveated; external surface of mandibular basal margin large and imbricated ( Fig. 24B View FIGURE 24 – esm). Antennal funiculi with pits; tip of apical segment of antennae bearing different sized pits ( Fig. 24C View FIGURE 24 – Ap). Mesopleuron foveate and micropunctate; metapleuron alveolate and foveated; lateral faces of propodeum foveated and micropunctate; alveoli denser just above metapleural gland orifice; opening of metapleural gland large, with smooth anterior region, surrounded by rows of hairs ( Fig. 24D View FIGURE 24 ). Petiolar node and postero-ventral lobe of petiole with incomplete foveae and micropunctures; latero-ventral region of petiole and subpetiolar process alveolate ( Fig. 24E View FIGURE 24 ). Posterior region of second gastral tergite with transversal rows of deep rounded pits.

Space between mesosomal foveae covered by dense pubescence.

Head 1.8 times longer than wide ( Fig. 25B View FIGURE 25 ). Hypostomal margin curved ( Fig. 24B View FIGURE 24 – he). Antennal scapes extend to head midlength, distance from scape apex to of head more than two times pedicel length (SI 59.3). Propodeum and petiole entirely emarginated posteriorly by a dark lamella, without teeth ( Fig. 25A View FIGURE 25 ); Petiole 1.5 times longer than high (PI 78.5) posterior face short, straight, and smooth; postero-ventral lobe short and subquadrate; subpetiolar process weakly developed ( Fig. 24E View FIGURE 24 ). First gastral segment with weakly developed prora and dorsal protuberance on posterior region of tergite weakly developed ( Figs. 24A View FIGURE 24 , 25A View FIGURE 25 ).

Etymology: The epithet refers to the posterior lamella of the propodeum and petiole, an exclusive characteristic of this species.

Distribution ( Fig. 29 View FIGURE 29 ): Brazil (PA).

Comments: Probolomyrmex lamellatus   is similar to P. cegua   , but the head is comparatively longer, the propodeum and petiole are unarmed and completely emarginated by a dark lamella, and the postero-ventral lobe of petiole is subquadrate. The single known specimen came from a leaf-litter sample collected at in mature lowland Amazon forest.


Universidade Federal do Parana, Colecao de Entomologia Pe. Jesus Santiago Moure