Abstract

FERNANDEZ-AZUARA, Geovany J. et al. Microcentrum tecactli, a new species of Phaneropteridae (Orthoptera: Tettigonioidea) from Northeastern Mexico. Acta Zool. Mex [online]. 2018, vol.34, e3412133.  Epub Nov 13, 2018. ISSN 2448-8445.  https://doi.org/10.21829/azm.2018.3412133.

Microcentrum tecactli n. sp., Barrientos-Lozano, Fernández-Azuara & Rocha-Sánchez, 2018, is described from specimens collected in the Huasteca region in the State of Hidalgo Mexico. Microcentrum tecactli exhibits affinities with Microcentrum rhombifolium (Saussure, 1859). However, it differs in morphological and acoustic characters. In males the length of the stridulatory file is 4.2 mm with ca. 62 teeth vs. 4 mm ca. 55 teeth in M. rhombifolium; the subgenital plate is distally more produced, the styles are shorter and diverging; the cerci are distally narrower, and the internal genitalia is different. Lone males produce two types of acoustic signals: i) a calling song that consists of a regular buzz made up of a single syllable (one Pulse Train Group), average duration 155±38 ms (78-212 ms) (3 males; n=29 samples one min each), with inter-syllable interval (Major Interval=MaI) of 1483±364 ms (115-2394 ms). Frequency spectrum is between 4 to >30 kHz, peak frequency (fi) is at 6-16 kHz. Syllables repetition rate is 48±4.36/min (43-55; n=10 samples one min each). ii) Sequence of ticks made up of two paired-phrases with an average duration of 7.53±0.16 s (3 males; n=5 paired-sequences of ticks); phrases 1 and 2 average duration is similar in each sequence, 2.3±0 s. The number of pulses per phrase is also the same in both phrases: 29 ±0 each. Major interval duration between sequences of ticks of two paired-phrases is 5.37±2.75 s. Minor interval duration between phrases 1 and 2 is 1.42±0.12 s (1.27-1.51). Frequency range is between 4 to >30 kHz, after 30 kHz the amount of energy is minimal. Dominant frequency spectrum ranges from 4 to 22 kHz and peak frequency (fi) is at 6-16 kHz. Repetition rate of tick-paired sequences is 0.1/s (6/min); in four paired-sequences of ticks the repetition rate of pulses/ticks in phrases 1 and 2 was the same, 12.6/s each one.

Keywords : Biodiversity; Ensifera; Bioacoustics; Phaneropterinae.

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