Marcelonemobius mutum, Cadena-Castañeda & Rodríguez & Navarrete-Heredia, 2019

Cadena-Castañeda, Oscar J., Rodríguez, William David & Navarrete-Heredia, José L., 2019, Orthoptera (Ensifera & Caelifera) collected using carrion traps in a Quercus forest in Jalisco, Mexico, with description of a new genus and a new species (Trigonidiidae: Nemobiinae), Zootaxa 4550 (3), pp. 401-415 : 407-408

Marcelonemobius mutum n. sp.

( Figs. 4–5 )

Holotype: 1 male. Mexico, Jalisco, around Chapala Lake , 20 ° 17'50.80 "N, 103 ° 12'31.48" O. 1630 m. Cadena- Castañeda, O. J. 29 March 2016 ( CAUD)

Paratypes: 1 male and 1 female from the same data as holotype ( CAUD) . 44 Females Collected on Cerro García 8 ( CAUD) and 36 (CZUG).

Description. Male. Coloration: Body dark brown with several spots brown and yellowish, head brown without prominent spots and without dorsal stripes (common in many nemobiinae species); antenomeres dark brown, maxillary palpi with the same coloration as the head. Pronotal disc yellowish brown with small black spots, as on the legs and ventral surface of the body; tegminae dark brown; abdomen mostly dark brown with few yellowish brown spots ( Figs. 4 A–B.). Head: ovoid in frontal view, wider than high, without bristles on frons and with many bristles on fastigial area and vertex, inter-antennal space broad, almost two and half the width of scapus; eyes large and prominent occupying much of the cephalic capsule in lateral view, without a pigmented band; three ocelli present round and similar in size, fifth article of maxillary palpi elongated and dilated at the apex. Thorax: pronotum with many short bristles, anterior and posterior margins of pronotal disc straight, lateral lobes with the lower margin slightly concave and the posterior edge ( Fig. 4B ). Tegmina ovoid and without stridulatory mechanism, lateral field of the tegmina with five veins not connected by transverse veins, dorsal field with six parallel veins connected with very few and small transverse veins at the apex, first basal half without transverse veins; hind wings absent ( Figs. 4 C–D). Meso- and metanotum without specialized glands, first and second abdominal tegite smooth and without bristles or specializations, the other tergites with many short bristles. Legs: Fore tibiae without auditory tympana, three ventral spines and two apical spurs present, the internal longer than the external; hind tibiae with four internal and external dorsal spurs, three apical spurs present on each side, the superior the longest on the inner side and the median the longest on the outer side( Figs. 4 E–F). Phallic complex: Pseudepiphallus elongated, apical portion with a pair of lateral, incurved sharp projections (these projections longer than found in Kevanemobius ) and with additional basal prolongation smaller and rounded in dorsal view; pseudepiphallic apodeme poorly developed, ectophallic fold divided at the apex and not reaching the posterior margin of the pseudoepiphallic lobe; endophallic sclerites membranous and with two lateral sections elongate; endophallic apodeme divided into three plates, the main W-shaped and two lateral ovoid and connected to the ectophallic apodemes ( Figs. 4 G–H).

Female. Similar to male in coloration (with the brown regions darker than the male), slightly longer and with short tegmina ( Fig. 5A ), mesonotum with a tubercle on each side ( Fig. 5B ). Ovipositor flattened laterally, apical valves with very minute serrulations ( Fig. 5C ); subgenital plate rectangular, wider than long and with bilobate apex ( Fig. 5D ).

Etymology: Named with reference to the absence of morphological structures for sound emission.

Measurements (mm) male/female: Body: 10–11.5/11.5–12.5, Pronotum length: 2–2.3/2.4–3, Pronotum wide: 2.5–2.8/2.5–3, Hind femur: 6.4–6.8/7–7.2, Hind tibia: 6.3–6.8/6.8–7.2. Tegmen: 2.8–3.2/3–3.4, Ovipositor: 5.6– 6.1.

Comments: They were collected in January, May, June and July.

Figures

FIGURE 4. Marcelonemobius mutum n. sp. (male). A–B. Habitus lateral and dorsal respectively. C–D. Forewings right and left. E–D. Hind leg outer and inner side. F–G. Genitalia in dorsal and ventral view respectively.

FIGURE 5. Marcelonemobius mutum n. sp. (female). A. Habitus lateral and dorsal. B. Head, pronotum, mesonotum and metanotum in dorsal view. C–D. Terminalia in lateral and ventral view respectively.