Fore wing mostly infuscated; hind coxa entirely pale; mesoscutum entirely melanic; scutellar sulcus with one median longitudinal carina; anterior transverse carina of propodeum reaching the lateral margin; median tergites mostly pale with posterior terga black; median syntergite 2+3 1.4 times longer than wide.

Holotype: female. Body length 7.1 mm. Fore wing length 6.4 mm. Fore wing mostly infuscated. Scutellar sulcus with one median longitudinal carina. Median areola of propodeum with well-defined margins. Anterior transverse carina of propodeum reaching the lateral margin. Lateral longitudinal carinae of median tergite 1 well-defined. Median syntergite 2+3 1.4 times longer than wide. Ovipositor slightly longer than body.

Similar to holotype.

Lytopylus gahyunae is named in honor of Gahyun Park, wife of the first author.

Reared 43 times from six species of Antaeotricha (40) and Stenoma (2) (Depressariidae) feeding on mature leaves of 3 species of Guarea and 1 of Trichilia (Meliaceae) in ACG rain forest at 380 to 620 m elevation.

Holotype♀: Costa Rica, Alajuela, Sector San Cristobal, Rio Areno, Area de Conservaciόn Guanacaste 10.91407N -85.38174W 460m., Osvaldo Espinoza coll., food plant: Meliaceae Guarea bullata, host caterpillar: Depressariidae, Stenomatinae, Antaeotricha Janzen09, coll. date: 6/4/2009, parasitoid eclosion date: 6/26/2009, DHJPAR0035229. Paratypes: [the following have the same data as the holotype except as indicated] 2♀, coll. date: 6/4/2009, parasitoid eclosion date: 6/22/2009, DHJPAR0035298, DHJPAR0035294. ♀, parasitoid eclosion date: 6/23/2009, DHJPAR0036371. ♀, Elda Araya coll., food plant: Guarea rhopalocarpa, coll. date: 5/4/2009, parasitoid eclosion date: 6/21/2009, DHJPAR0035231. DHJPAR0035294. pes: [the following have the same data as the holotype except as indicated] 2odeum with well-defined ma8/27/2009, DHJPAR0036721. [same as previous except coll. date and eclosion date] ♀, coll. date: 9/13/2009, parasitoid eclosion date: 10/2/2009, DHJPAR0036686. ♂, Puente Palma, 10.9163N -85.37869W 460m., Carolina Cano coll., food plant: Guarea kegelii, coll. date: 11/10/2011, parasitoid eclosion date: 11/26/2011, DHJPAR0046956. ♀, Puente Palma, 10.9163N -85.37869W 460m., Gloria Sihezar coll., host caterpillar: Antaeotricha Janzen12, coll. date: 11/24/2012, parasitoid eclosion date: 12/27/2012, DHJPAR0051365. ♂, Tajo Angeles, 10.86472N -85.41531W 540m., Gloria Sihezar coll., food plant: Guarea kegelii, host caterpillar: Depressariinae, Antaeotricha Janzen07, coll. date: 9/24/2011, parasitoid eclosion date: 10/14/2011, DHJPAR0045788. [same as previous except coll. date and eclosion date] ♀, host caterpillar: Stenomatinae, coll. date: 11/6/2011, parasitoid eclosion date: 11/24/2011, DHJPAR0046745. ♀, host caterpillar: Stenomatinae, Antaeotricha Janzen09, coll. date: 11/22/2011, parasitoid eclosion date: 12/13/2011, DHJPAR0046744. ♀, Sendero Huerta, 10.9305N -85.37223W 527m., Gloria Sihezar coll., coll. date: 7/2/2012, parasitoid eclosion date: 7/27/2012, DHJPAR0049943. [same as previous except coll. date and eclosion date] ♀, 12/2/2012 12/24/2012, DHJPAR0051374. [same as previous except food plant, coll. date and eclosion date] 1♀, 1♂, food plant: Guarea kegelii, coll. date: 12/8/2012, parasitoid eclosion date: 1/1/2013, DHJPAR0051349, coll. date: 12/8/2012, parasitoid eclosion date: 12/31/2012, DHJPAR0051370. ♀, Elda Araya coll., host caterpillar: Stenoma Janzen144, coll. date: 7/21/2012, parasitoid eclosion date: 8/14/2012, DHJPAR0049649. [same as previous except food plant, coll. date and eclosion date] 2♀, food plant: Guarea kegelii, coll. date:12/23/2012, parasitoid eclosion date: 1/10/2012, DHJPAR0051360, coll. date: 12/23/2012, parasitoid eclosion date: 1/7/2013, DHJPAR0051371. ♀, Sendero Perdido, 10.8794N -85.38607W 620m., Carolina Cano coll., food plant: Guarea kegelii, coll. date: 10/9/2013, parasitoid eclosion date: 10/29/2013, DHJPAR0053649. [same as previous except coll. date and eclosion date] 2♂, 10/11/2013 10/26/2013, DHJPAR0053652, coll. date: 10/11/2013, parasitoid eclosion date: 10/29/2013, DHJPAR0053655. [same as previous except food plant, coll. date and eclosion date] ♀, food plant: Trichilia adolfi, coll. date: 10/9/2013, parasitoid eclosion date: 10/30/2013, DHJPAR0053654. ♂, Sendero Perdido, 10.8794N -85.38607W 620m., Gloria Sihezar coll., food plant: Guarea kegelii, 9/24/2013 10/9/2013, DHJPAR0053658. [same as previous except caterpillar, coll. date and eclosion date] ♂, host caterpillar: Antaeotricha Janzen07, 10/25/2013 11/22/2013, DHJPAR0054538. ♂, Sendero Perdido, 10.8794N -85.38607W 620m., Elda Araya coll., food plant: Guarea kegelii, coll. date: 1/9/2014, parasitoid eclosion date: 1/23/2014, DHJPAR0054515. [same as previous except coll. date and eclosion date] ♂, 1/9/2014 1/25/2014, DHJPAR0054517. ♀, Sendero Perdido, 10.8794N -85.38607W 620m., Elda Araya coll., food plant: Guarea rhopalocarpa, coll. date: 11/29/2013, parasitoid eclosion date: 12/29/2013, DHJPAR0054539. [same as previous except caterpillar and eclosion date] ♀, host caterpillar: Antaeotricha thapsinopa, parasitoid eclosion date: 12/31/2013, DHJPAR0054532. ♀, Sendero Perdido, 10.8794N -85.38607W 620m., Elda Araya coll., food plant: Trichilia adolfi, host caterpillar: Antaeotricha Janzen07, 2/1/2010 2/14/2010, DHJPAR0038910. ♀, Finca San Gabriel, 10.87766N -85.39343W 645m., Carolina Cano coll., food plant: Guarea kegelii, host caterpillar: Antaeotricha Janzen07, coll. date: 10/18/2013, parasitoid eclosion date: 11/2/2013, DHJPAR0054519. ♂, Finca San Gabriel, 10.87766N -85.39343W 645m., Carolina Cano coll., food plant: Guarea rhopalocarpa, host caterpillar: Stenoma Janzen144, coll. date: 8/11/2013, parasitoid eclosion date: 8/29/2013, DHJPAR0053645. ♀, Finca San Gabriel, 10.87766N -85.39343W 645m., Elda Araya coll., food plant: Guarea kegelii, coll. date: 1/6/2014, parasitoid eclosion date: 1/24/2014, DHJPAR0054511. ♂, Sendero Palo Alto, 10.88186N -85.38221W 570m., Carolina Cano coll., food plant: Guarea rhopalocarpa, coll. date: 9/12/2013, parasitoid eclosion date: 9/29/2013, DHJPAR0053618. [same as previous except eclosion date] ♂, parasitoid eclosion date: 10/2/2013, DHJPAR0053621. ♀, Cementerio Viejo, 10.88111N -85.38889W 570m., Carolina Cano coll., food plant: Guarea kegelii, coll. date: 9/10/2013, parasitoid eclosion date: 10/1/2013, DHJPAR0053611. [same as previous except eclosion date] ♂, parasitoid eclosion date: 9/30/2013, DHJPAR0053619. [same as previous except caterpillar, coll. date and eclosion date] ♀, host caterpillar: Antaeotricha ribbei 12/3/2013 12/21/2013, DHJPAR0054520. [same as previous except coll. date and eclosion date] ♀, 12/3/2013 12/21/2013, DHJPAR0054534. ♂, Sendero Corredor, 10.87868N -85.38963W 620m., Carolina Cano coll., food plant: Trichilia adolfi, host caterpillar: Depressariinae, Antaeotricha Janzen09, coll. date: 1/3/2014, parasitoid eclosion date: 1/25/2014, DHJPAR0054518. ♀, Rio Blanco Abajo, 10.90037N -85.37254W 500m., Elda Araya coll., coll. date: 8/11/2009, parasitoid eclosion date: 8/27/2009, DHJPAR0036722. ♂, Guanacaste, Sector Del Oro, Margarita, 11.03234N -85.43954W 380m., Lucia Ríos coll., host caterpillar: Antaeotricha thapsinopa, coll. date: 1/15/2005, parasitoid eclosion date: 2/1/2005, DHJPAR0015317.