Two overlooked elusive crakes (Aves, Rallidae): first country record of Ocellated Crake Micropygia schomburgkii in Ecuador and Rufous-faced Crake Laterallus xenopterus in Peru

Figures & data

Figure 1. Spectrograms comparing vocalizations of Russet-crowned Crake, Anurolimnas viridis, and Ocellated Crake, Micropygia schomburgkii. The top three spectrograms show trills of Anurolimnas viridis and Micropygia schomburgkii. The three bottom spectrograms in solid-line boxes belong to zoomed-in insets of the corresponding top spectrograms. The pink circle with white dot corresponds to the first country record of Micropygia schomburgkii for Ecuador (originally identified by the recordist as Russet-crowned Crake, Anurolimnas viridis). Note duet trill of Anurolimnas viridis, in contrast to solo trills of Micropygia schomburgkii followed by diagnostic prrrxzzz “crying” notes. See Appendix 1 for recordings supporting information

Figure 2. Spectrograms comparing vocalizations of Grey-breasted Crake, Laterallus exilis, and Rufous-faced Crake, Laterallus xenopterus. The top three spectrograms show duet trills of Laterallus exilis and Laterallus xenopterus. The bottom three spectrograms with solid lines belong to zoomed-in insets of the corresponding top spectrograms. The blue square with white dot corresponds to the first country record of Laterallus xenopterus for Peru (originally identified by the recordist as Grey-breasted Crake, Laterallus exilis). Note longer note duration, more tonal notes, and diagnostic isolated final note (diagonal arrows) of Laterallus xenopterus in comparison to harsh notes that rapidly descend in pitch in Laterallus exilis. See Appendix A for recordings supporting information

Figure 3. Map showing localities of Rufous-faced Crake, Laterallus xenopterus, and Ocellated Crake, Micropygia schomburgkii, in central west South America (data from [6]). New country records of Micropygia schomburgkii for Ecuador, and Laterallus xenopterus for Peru, are shown in symbols with a white dot

Table

Species	Catalog number	Date	Country	State, province, or department	Locality	Latitude (degrees)	Longitude (degrees)	Recorder	Channels	Sample rate (KHz)	Bit depth	Microphone	Recordist
Anurolimnas viridis	ML247884591	21 April 2017	Ecuador	Zamora Chinchipe	El Chorro – La Chonta road	−4.93775	−79.10046	MARANTZ PMD 661	Dual Mono	48	24 bits	Sennheiser ME 67	Emiliano A. Depino
Laterallus exilis	ML247888971	17 April 2017	Ecuador	Napo	Tena	−1.05962	−77.60128	MARANTZ PMD 661	Dual Mono	48	24 bits	Sennheiser ME 67	Emiliano A. Depino
Laterallus xenopterus	ML247887531	4 October 2016	Paraguay	Canindeyú	RNBM, Aguará Ñú	−24.17680	−55.29483	MARANTZ PMD 661	Mono	48	24 bits	Sennheiser ME 62 on Telinga Universal Parabola	Emiliano A. Depino
Laterallus xenopterus	ML44076	15 August 1988	Peru	Madre de Dios	Pampas del Heath	−13.0	−69.0	Nagra 4.2	Mono	44.1	16 bits	Electro-Voice DL42	Theodore A. Parker III
Micropygia schomburgkii	XC476512	23 May 2019	Brazil	São Paulo	Franco da Rocha, Parque Estadual do Juquery	−23.3449	−46.6903	-	Mono	48	32 bits	-	Marcelo J. Feliti
Micropygia schomburgkii	XC251040/ML246349	23 October 2004	Ecuador	Zamora Chinchipe	El Chorro – La Chonta road	−4.936	−79.105	Sony TCM 5000	Mono	44.1	16 bits	Sennheiser ME 67	Niels K. Krabbe

Depino EA. Filogenia, biogeografía e historia natural de los “burritos trinadores” (Aves: Laterallus) [PhD dissertation]. San Miguel de Tucumán (Tucumán): Universidad Nacional de Tucumán; 2020.

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