Phelister arcuatus, Caterino & Tishechkin, 2020

Caterino, Michael S. & Tishechkin, Alexey K., 2020, Recognition and revision of the Phelister blairi group (Histeridae, Histerinae, Exosternini), ZooKeys 1001, pp. 1-154 : 1

36. Phelister arcuatus sp. nov. Figs 21E-H , 22G, H , Map 13

Type material.

Holotype male: "Cuyaba [-15.6, -56.1] M. Grossa Brazil " / "CNHM Colln. (ex. Colln. C. A. Ballou)" / " Brachylister " ( Discoscelis ) Phelister amazoniae Lewis" / "Caterino/Tishechkin Exosternini Voucher EXO-03000" (FMNH); Paratypes (19): Brazil: Mato Grosso, Mpio. Claudia (-11.2416, -55.325), 10/17/10-10/27/10, FIT, A.F. Oliveira, EXO-02999 (CEMT, 1ex.); Mato Grosso, Mpio. Querencia, Fazenda São Luiz (-12.597, -52.3749), July 2008, FIT, R. Andrade, (CEMT, 2ex.); Mato Grosso, Mpio. Querencia, Fazenda São Luiz (-12.597, -52.3749), February 2009, FIT, R. Andrade (CEMT, 11ex.); Mato Grosso, Mpio. Tangara da Serra (-14.3175, -57.7317), 640 m, 1/22/09-1/29/09, FIT, R.S. Silva, EXO-02996 (CEMT, 1ex.); Pará, Belém, Utinga (IPEAN) (-1.45, -48.4333), December 1984, FIT (CHND, 2ex.); Pará, Belém, Utinga (IPEAN) (-1.45, -48.4333), October, 1986, FIT, N. Degallier, EXO-00004 (CHND, 1ex.); Pará, Tucuruí (-3.75, -49.667), 12/5/87-12/17/87, FIT, EXO-00825 (CHND, 1ex.).

Diagnostic description.

Length: 2.36-2.99 mm (avg. 2.77 mm); width: 2.01-2.80 mm (avg. 2.55 mm). This species is very similar and closely related to the preceding, and is only described here to the extent that they differ. Body smaller; pronotal discal punctures distinctly ‘doubled’ (two sizes of punctures intermingled); elytral striae slightly crowded laterad, with the 4th stria distinctly outwardly arcuate; inner subhumeral and 1st through 4th dorsal striae more distinctly carinate; pygidium lacking marginal stria. Male genitalic morphology generally very similar to the preceding species, but aedeagus narrower and slightly flatter than that of P. amazoniae , with the basal wide portion accounting for more of the overall tegmen length, basal piece shorter.

Etymology.

This species’ name refers to the strongly outwardly bowed 4th (and other) elytral striae.

Distribution.

This species is known from Pará and Mato Grosso states, Brazil.

Remarks.

This species is broadly sympatric with the preceding, but the differences are consistent across this range, particularly the lack in the present species of a marginal pygidial stria. Both species are known from males and females, precluding the possibility that their differences represent sexual dimorphism.

Figures

Map 13. Collecting records for Phelister amazoniae (white circles), P. arcuatus (black squares), and P. praecisus (stars).

Figure 21. A, B Phelister notandus: A dorsal habitus B ventral habitus C, D Phelister amazoniae: C dorsal habitus D ventral habitus E-H P. arcuatus: E dorsal habitus F ventral habitus G mesothoracic leg H posterior view showing carinate elytral striae.

Figure 22. Male genitalia A-F Phelister amazoniae: A tergite 8 B sternite 8 C tergites 9 & 10 D sternite 9 E aedeagus, dorsal F aedeagus, lateral G, H P. arcuatus (outlines only, to contrast with E and F): G aedeagus, dorsal H tegmen, lateral.