Two new species of Megarthrus (Coleoptera, Staphylinidae, Proteininae) from Mexican Cloud Forests
Rodríguez, William David
Navarrete-Heredia, José L.
Arriaga-Varela, Emmanuel
Cuccodoro, Giulio
Zootaxa
2020
2020-05-15
4778
3
571
583
8Y69S
Rodriguez, Navarrete-Heredia & Arriaga-Varela
Rodriguez, Navarrete-Heredia & Arriaga-Varela
2020
[151,1027,1592,1620]
Insecta
Staphylinidae
Megarthrus
Animalia
Coleoptera
7
578
Arthropoda
species
cavianae
sp. nov.
( Figs 27-39) http://zoobank.org:act: F4814244-2EA7-493D-8086-01CC754585C0
Type material.( 3♂, 2♀). Holotype ♂: labeled “ MÉXICO: Veracruz, San Andrés Tlalnelhuayocan, Piedra Parada, 19°30’58.6’’N 97°00’34.4’’W, 1522 msnm, Fragmento de Bosque Mesófilo de Montañaripario, Cernido de Hojarasca húmeda, extraída en Winkler, 5.V.2013, F. Alvarado, E. Arriaga, R. Chaverocols”, in CZUG. Paratypes(4): labeled “ MÉXICO: Veracruz, Xico, Matlalapa, 19°26’24.8»N 97°02’37.2»W, 1532 msnm. Fragmento de Bosque Mesófilo de Montañaripario, Cernido de Hojarasca húmeda, extraída en embudo de Berlesse, 20.VI.2012. F. Escobar, F. Alvarado, R. Chaverocols”, 1♀in CZUG, 1♂in IEXA, and 1 ♂, 1♀in MHNG.
Description.Similar to M. chiapasfrom which it differs as follows: Habitus as in Fig. 29. Combined length of pronotum and elytra = 1.0 - 1.4 mm; maximal pronotal width = 0.7 - 1.1 mm. Antennae as in Fig. 36. Elytra with humeral callus strongly convex; disc with humeral callus strongly convex, two conspicuous swellings similar to humeral callus along anterior and posterior portions of suture, moderately depressed posteriorly along lateral edge. Male: Frontoclypeal area not modified. Protarsomere 1 lacking ventral patch of modified adhesive setae. Mesofemora ( Fig. 33) as long as metafemora. Mesotibiae ( Fig. 34) shorter than metatibiae ( Fig. 35), the latter slightly compressed subapically. Peg-like setae present only on mesotrochanters ( Fig. 33; arranged in a single row), on distal two thirds of mesotibiae ( Fig. 34; grouped in a field) and on distal half of metatibiae ( Fig. 35; grouped in a field). Apical segments of abdomen similar to those in Figs 10-15 & 18; tergite VIII as in Figs 38, with apex sinuate in dorsal view. Aedeagus as in Figs 32 & 37, with dorsal valve triangular. FIGURES 29–31. Megarthrus cavianae sp. nov., female: habitus in dorsal view (29); abdominal sternite VIII in ventral views (30); apical segments of abdomen in lateral view (31). Scale bars; vertical = 0.5 mm (29); 25–26. horizontal = 0.2 mm (30, 31). FIGURES 32–38. Megarthrus cavianae sp. nov., male: aedeagus in ventral (32) and lateral (37) views; mesofemur and mes- otrochanter (33); mesotibia (34); metatibia (35); antenna (36); abdominal tergite VIII in dorsal view (38). Scale bars = 0.2 mm: 32–35, 37, 38 (horizontal); 36 (vertical). Female: Abdominal tergite forming a medioapical projection, with dorsal outline subangulate subapically in lateral view VIII ( Fig. 31). Sternite VIII as in Fig. 30. Genital segments similar to those in Figs 19-21; gonocoxal plate without mediodorsal ridge. Comparisons and diagnostic notes. Megarthrus cavianaeRodríguez, Navarrete-Heredia & Arriaga-Varela sp. nov.is similar to M. chiapasCuccodoro sp. nov., from which it differs by its more pronounced elytral relief, as well as several other features detailed in Comparisons and diagnostic notesunder M. chiapas.
Distribution and natural history. Megarthrus cavianaeRodríguez, Navarrete-Heredia & Arriaga-Varela sp. nov.is apparently restricted to Mountain Cloud Forests in the south of the Transmexican Volcanic Belt ( Fig. 39). The specimens were collected from sifted leaf litter in riparian remnants of cloud forests at an elevation of approximately 1500 m.
Etymology.The specific name is a composite word in honor to Carmen Moreno Jiménez, Virginiade Jesús Rodríguez, Ana Cricelia Rodríguez, and Ana María Jiménez, in recognition of their unconditional support of the first author.
2620268301
2013-05-05
CZUG
F. Alvarado & E. Arriaga & R. Chavero
Mexico
19.516277
Winkler
1
-97.00955
Fragmento de Bosque Mesofilo de Montana
7
578
1
1
Veracruz de Ignacio de la Llave
holotype
2620268303
2012-06-20
F. Escobar & F. Alvarado & R. Chavero
Mexico
19.440222
Berlesse
1
-97.04366
Fragmento de Bosque Mesofilo de Montana
7
578
1
Veracruz de Ignacio de la Llave
paratype
2620268306
[550,700,1910,1936]
CZUG
Mexico
7
578
1
1
Veracruz de Ignacio de la Llave
paratype
2620268302
[711,852,1910,1937]
IEXA
Mexico
7
578
1
1
Veracruz de Ignacio de la Llave
paratype