Megarthrus cavianae Rodríguez, Navarrete-Heredia & Arriaga-Varela

Rodríguez, William David, Navarrete-Heredia, José L., Arriaga-Varela, Emmanuel & Cuccodoro, Giulio, 2020, Two new species of Megarthrus (Coleoptera, Staphylinidae, Proteininae) from Mexican Cloud Forests, Zootaxa 4778 (3), pp. 571-583: 578-581

publication ID

https://doi.org/10.11646/zootaxa.4778.3.8

publication LSID

lsid:zoobank.org:pub:330A0F91-1F61-4DD7-948A-78955F8455D4

DOI

http://doi.org/10.5281/zenodo.3848002

persistent identifier

http://treatment.plazi.org/id/03E5ED0A-FF98-D562-2B99-6A19FEF9FDD1

treatment provided by

Plazi

scientific name

Megarthrus cavianae Rodríguez, Navarrete-Heredia & Arriaga-Varela
status

sp. nov.

Megarthrus cavianae Rodríguez, Navarrete-Heredia & Arriaga-Varela  sp. nov.

( Figs 27-39View FIGURES 25–28View FIGURES 29–31View FIGURES 32–38View FIGURE 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 Montaña ripario, Cernido de Hojarasca húmeda, extraída en Winkler , 5.V.2013, F. Alvarado, E. Arriaga, R. Chavero cols”, in CZUGGoogleMaps  . Paratypes (4): labeled “ MÉXICO: Veracruz, Xico, Matlalapa, 19°26’24.8»N 97°02’37.2»W, 1532 msnm. Fragmento de Bosque Mesófilo de Montaña ripario, Cernido de Hojarasca húmeda, extraída en embudo de Berlesse , 20.VI.2012. F. Escobar, F. Alvarado, R. Chavero cols”GoogleMaps  , 1♀ in CZUG  , 1♂ in IEXA  , and 1 ♂, 1♀ in MHNG.

Description. Similar to M. chiapas  from which it differs as follows: Habitus as in Fig. 29View FIGURES 29–31. Combined length of pronotum and elytra = 1.0 - 1.4 mm; maximal pronotal width = 0.7 - 1.1 mm. Antennae as in Fig. 36View FIGURES 32–38. 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. 33View FIGURES 32–38) as long as metafemora. Mesotibiae ( Fig. 34View FIGURES 32–38) shorter than metatibiae ( Fig. 35View FIGURES 32–38), the latter slightly compressed subapically. Peg-like setae present only on mesotrochanters ( Fig. 33View FIGURES 32–38; arranged in a single row), on distal two thirds of mesotibiae ( Fig. 34View FIGURES 32–38; grouped in a field) and on distal half of metatibiae ( Fig. 35View FIGURES 32–38; grouped in a field). Apical segments of abdomen similar to those in Figs 10-15 & 18View FIGURES 10–18; tergite VIII as in Figs 38View FIGURES 32–38, with apex sinuate in dorsal view. Aedeagus as in Figs 32 & 37View FIGURES 32–38, with dorsal valve triangular.

Female: Abdominal tergite forming a medioapical projection, with dorsal outline subangulate subapically in lateral view VIII ( Fig. 31View FIGURES 29–31). Sternite VIII as in Fig. 30View FIGURES 29–31. Genital segments similar to those in Figs 19-21View FIGURES 19–24; gonocoxal plate without mediodorsal ridge.

Comparisons and diagnostic notes. Megarthrus cavianae Rodríguez, Navarrete-Heredia & Arriaga-Varela  sp. nov. is similar to M. chiapas Cuccodoro  sp. nov., from which it differs by its more pronounced elytral relief, as well as several other features detailed in Comparisons and diagnostic notes under M. chiapas  .

Distribution and natural history. Megarthrus cavianae Rodríguez, Navarrete-Heredia & Arriaga-Varela  sp. nov. is apparently restricted to Mountain Cloud Forests in the south of the Transmexican Volcanic Belt ( Fig. 39View FIGURE 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, Virginia de Jesús Rodríguez, Ana Cricelia Rodríguez, and Ana María Jiménez, in recognition of their unconditional support of the first author.

CZUG

Universidad de Guadalajara,Centro de Estudios en Zoologia, Entomologia