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The life cycle, morphology, and bionomy of Photinus extensus Gorham, 1881, an endemic species of Mexico, are described. Redescriptions of adults (male and female) are also presented. Larvae were reared to the adult stage from eggs laid by females collected at the El Pedregal de San Ángel Ecological Reserve, south of Mexico City. The activity period of adults of P. extensus begins at the end of July and finishes by the end of August. Females lay between 3 and 198 eggs. Larvae hatch from the eggs after a period of 11 to 71 days, undergo 6 larval instars and a pupal stage in an annual cycle. Morphological characters of the sixth larval instar of P. extensus are compared with those of several other genera assigned to the tribe Photinini. Knowledge of the natural history of firefly larvae is relevant since most species do not feed as adults and therefore depend on resources acquired during the larval stage.

Genus Microphotus LeConte, 1866. NAR: BC, SO, CH; MTZ: SC, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 300, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269, {"references":["LeConte, J. L. (1866) New species of North American Coleoptera. Prepared for the Smithsonian Institution. Part I. Smithsonian Miscellaneous Collections, 6 (167), 87 - 168."]}

Photinus danieli Zaragoza-Caballero, 2017 MEXICO: OA Endemic, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 302, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269

Pleotomus pallens LeConte, 1866 USA; MEXICO: DG, JC, MI, NA, NL, OA, PU, SI, SL, TM, VE = Pleotomus davisii LeConte, 1881, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 305, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269, {"references":["LeConte, J. L. (1866) New species of North American Coleoptera. Prepared for the Smithsonian Institution. Part I. Smithsonian Miscellaneous Collections, 6 (167), 87 - 168.","LeConte, J. L. (1881) Synopsis of the Lampyridae of the United States. Transactions of the American Entomological Society, 9, 15 - 72. https: // doi. org / 10.2307 / 25076399"]}

Photinus paracongruus Zaragoza-Caballero, 1996 MEXICO: VE Endemic, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 303, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269, {"references":["Zaragoza-Caballero, S. (1996 a) Especies nuevas de Cratomorphus (Coleoptera: Lampyridae, Photinini) de Mexico. Anales del Instituto de Biologia de la Universidad Nacional Autonoma de Mexico, Serie Zoologia, 67 (2), 319 - 329."]}

Photinus hymenodrilus Zaragoza-Caballero & Guti��rrez-Carranza, 2020. MEXICO: PU Endemic, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 302, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269

Pyractomena angulata (Say, 1825) Canada; USA; MEXICO: MO, NL, PU, SL, TM, VE = Lampyris angulata Say, 1825 = Pyractomena flavocincta LeConte, 1852, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 300, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269, {"references":["Say, T. (1825) Descriptions of new species of coleopterous insects inhabiting the United States. Journal of the Academy of Natural Sciences of Philadelphia, 5 (1), 160 - 204. https: // doi. org / 10.2307 / 1005051"]}

Photinus ruficollis Gorham, 1880 MEXICO: GR, MO; Guatemala, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 303, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269, {"references":["Gorham, H. S. (1880) I. Materials for a revision of Lampyridae. Transactions of the Entomological Society of London, 28 (1), 1 - 36. https: // doi. org / 10.1111 / j. 1365 - 2311.1880. tb 02016. x"]}

Photinus andresi Zaragoza-Caballero & L��pez-P��rez, 2020. MEXICO: PU Endemic, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 301, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269

Photinus flohri Gorham, 1884 MEXICO Endemic, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 302, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269

Phaenolis atripes Pic, 1937 MEXICO Endemic, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 304, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269, {"references":["Pic, M. (1937) Malacodermes exotiques. L'Echange, Revue Linnenne, 53, 142."]}

Aspisoma yucatanum Olivier, 1908 MEXICO: CM, YU Endemic, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 299, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269, {"references":["Olivier, E. (1908) Lampyrides nouveaux du Musee de Geneve. Annales de la Societe Entomologique de France, 52, 262 - 263. https: // doi. org / 10.5962 / bhl. part. 5006"]}

Bicellonycha mexicana (Gorham, 1880) MEXICO: MO, PU, VE Endemic = Photuris mexicana Gorham, 1880, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 305, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269, {"references":["Gorham, H. S. (1880) I. Materials for a revision of Lampyridae. Transactions of the Entomological Society of London, 28 (1), 1 - 36. https: // doi. org / 10.1111 / j. 1365 - 2311.1880. tb 02016. x"]}

Photinus cempoalli Zaragoza-Caballero & Zurita-García, 2020. MEXICO: EM Endemic

Photinus productus Gorham, 1881 MEXICO: CS, CX, OA, PU, VE Endemic = Macrolampis producta (Gorham, 1881), Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 303, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269

Genus Prolutacea Cicero, 2006 NTR: PL, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 300, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269, {"references":["Cicero, J. M. (2006) Two new genera and one new species of firefly (Coleoptera: Lampyridae: Lampyrinae: Lampyrini), with notes on their biology. The Pan-Pacific Entomologist, 82 (2), 200 - 207."]}

Photinus advenus Olivier, 1907 MEXICO: MI, OA, SL, VE Endemic = Photinus consanguineus Gorham, 1881, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 301, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269, {"references":["Olivier, E. (1907) Coleoptera, Lampyridae. Genera Insectorum, 53, 1 - 74."]}

Photinus paulinae Zaragoza-Caballero, 2015 MEXICO: SO Endemic, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 303, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269, {"references":["Zaragoza-Caballero, S. (2015) Nuevas especies de Photinus (Coleoptera: Lampyridae: Photinini) del bosque tropical caducifolio del Pacifico mexicano. Revista Mexicana de Biodiversidad, 8, 638 - 651. https: // doi. org / 10.1016 / j. rmb. 2015.08.001"]}

Photinus temazcalli Zaragoza-Caballero & Gonz��lez-Ram��rez, 2020. MEXICO: EM Endemic, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 304, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269

Aspisoma laterale (Fabricius, 1801) MEXICO; Costa Rica; Nicaragua; Panama; Colombia = Lampyris lateralis Fabricius, 1801 = Aspisoma berbicensis Voet, 1804, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 299, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269, {"references":["Fabricius, J. C. (1801) Systema Eleutheratorum secundum ordines, genera, species: adiectis synonymis, locis, observationibus, descriptionibus. Tomus II. Kiliae: Bibliopoli academmici novi, 687 pp.","Voet. J. E. (1804) Catalogus systematicus coleopterorum. A la Haye: Chez G. Bakhusen, 482 pp."]}

Lucidota purulana (Gorham, 1884) MEXICO; Guatemala = Photinus purulanus Gorham, 1884, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 300, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269

Bicellonycha gorhami Zaragoza-Caballero, 1989 MEXICO: GR, JC, MO, VE; Guatemala, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 305, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269, {"references":["Zaragoza-Caballero, S. (1989) Trece especies nuevas de Bicellonycha Motschulsky, 1852 (Coleoptera: Lampyridae: Photurinae) de America. Anales del Instituto de Biologia de la Universidad Nacional Autonoma de Mexico, Serie Zoologia, 59 (2), 253 - 296."]}

Pyractomena dorsalis Motschulsky, 1854 MEXICO Endemic, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 300, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269, {"references":["Motschulsky, V. (1854 a) Lampyrides. Etudes Entomologiques, 2, 1 - 14. https: // doi. org / 10.5962 / bhl. title. 124602"]}

Genus Paracratomorphus Zaragoza-Caballero, 2013 MTZ: SO, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 300, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269, {"references":["Zaragoza-Caballero, S. (2013) Paracratomorphus nuevo genero (Coleoptera: Lampyridae: Cratomorphinni) de Mexico. Dugesiana, 20 (2), 145 - 148. https: // doi. org / 10.32870 / dugesiana. v 20 i 2.4112"]}

Chespirito ballantyneae Ferreira, Keller and Branham, 2020. MEXICO: PU Endemic, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 298, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269, {"references":["Ferreira, V. S., Keller, O. & Branham, M. A. (2020) Multilocus phylogeny support the nonbioluminescent firefly Chespirito as a new subfamily in the Lampyridae (Coleoptera: Elateroidea). Insect Systematics and Diversity, 4 (6), 1 - 13. https: // doi. org / 10.1093 / isd / ixaa 014"]}

Aspisomoides costatum (Gorham, 1880) MEXICO: CS, DG, GR, OA, TB, VE; Belize; Costa Rica Guatemala; Honduras; Nicaragua; Panama = Aspidosoma costatum Gorham, 1880, Published as part of P��rez-Hern��ndez, Cisteil X., Zaragoza-Caballero, Santiago & Romo-Galicia, Alberto, 2022, Updated checklist of the fireflies (Coleoptera: Lampyridae) of Mexico, pp. 291-317 in Zootaxa 5092 (3) on page 299, DOI: 10.11646/zootaxa.5092.3.3, http://zenodo.org/record/5881269, {"references":["Gorham, H. S. (1880) I. Materials for a revision of Lampyridae. Transactions of the Entomological Society of London, 28 (1), 1 - 36. https: // doi. org / 10.1111 / j. 1365 - 2311.1880. tb 02016. x"]}