Two new species of Americanura (Collembola: Neanuridae) from Belize, Central America Author Palacios-Vargas, José G. Universidad Nacional Autónoma de México, Facultad de Ciencias, Depto. Ecología y Recursos Naturales, Laboratorio de Ecología y Sistemática de Microartrópodos, Ciudad de México, Coyoacán 04510, México D. F.; E-mail: troglolaphysa @ hotmail. com (J. G. P. - V.), bemrecam @ gmail. com (B. E. M. - R.) troglolaphysa@hotmail.com Author Mejia-Recamier, Blanca E. Universidad Nacional Autónoma de México, Facultad de Ciencias, Depto. Ecología y Recursos Naturales, Laboratorio de Ecología y Sistemática de Microartrópodos, Ciudad de México, Coyoacán 04510, México D. F.; E-mail: troglolaphysa @ hotmail. com (J. G. P. - V.), bemrecam @ gmail. com (B. E. M. - R.) troglolaphysa@hotmail.com Author Vázquez, M. Magdalena University of Quintana Roo, División de Ciencias e Ingenierías, Chetumal, Quintana Roo, México; E-mail: marvazqu 94 @ gmail. com (M. M. V.) marvazqu94@gmail.com text Florida Entomologist 2017 2017-06-30 100 2 310 310 http://www.bioone.org/doi/10.1653/024.100.0228 journal article 299641 10.1653/024.100.0228 4ba55962-3f6a-4ebc-91b4-4b4a7746000c 1938-5102 12171275 Americanura denisi sp. nov. ( Figs. 4–6 ) TYPE MATERIAL HOLOTYPE female : 4 paratype females , 1 paratype male . All the type material will be kept at senior authors’ institution. Type Locality: BELIZE , Chikibul National Park , ex litter, 12 Nov 1998 , ex litter, col. M. Vázquez , H. Klompen , C. Chargoy . DESCRIPTION Length 1.2 mm (range 1.3–1.6 mm ; n = 3). Color white in alcohol. Granulations fine, about half size of 1 eye. Tubercles well developed, cephalic tubercles B not coalesce, and those of Abd IV , De, DL, and L fused. Head seta F short (93 µ m). Four kinds of body setae, relatively short and slightly barbulated macrosetae ( BM on Di tubercle / Th II , III ; Abd I and IV ) 119, 111; 111 and 128 µ m, short barbulated mesosetae (bme) 83 µ m (range 67–86 µm), and M 122 µ m (range 109–130 µm) nearly smooth with few barbulations, microsetae 38 µm (range 33–45 µm) besides sensorial seta (ss) around 100 µm ( Fig. 5 ). Ant I with 7 setae, 3 are dorsal BM , Ant II with 11 setae, 4 dorsal weakly barbulated. Ant III sensorial organ with 2 globular sensilla in a cuticular fold, and 2 guard sensilla. Sgd slightly curved and as long as Sgv, 1 microsensillum ventro-external. Ant IV typical for genus ( Fig. 4 ) with sensilla S7 hypertrofied and S1 and S2 subequal to others. Eyes 2 + 2 with dark pigment. Setae Ocm and Ocp short (99 µm). Mandibles with 3 teeth, maxillae styliform. Head with tubercles well developed, chaetotaxy in Fig. 2 and Table 3 . Tibiotarsi I, II and III without tenent hairs, with 18, 18, and 17 setae, respectively. Thoraxic and abdominal chaetotaxy in Figs. 5 and 6 . The total chaetotaxy is shown in Tables 3 and 4 . Ventral tube with 4 + 4 setae, the 2 distal setae subequal in size. Female genital plate with 3 + 3 pregenital seate, 20 to 23 circumgenital, 2 eugenital setae. Furcal vestige without microsetae. ETYMOLOGY Species is named afer Dr. Edouard Denis, for his contributions to the Collembola of Central America. Table 2. Chaetotaxy of Americanura belicensis sp. nov. by demitergite. +/- indicates presence/absence.

Body part	Demitergite	Di	De	DL	L
Thorax	I	—	BM, bme	BM	—
II	BM, 2bme	BM, bme + ss	BM, 2bme + ss	2BM, bme
III	BM, 2bme	BM, bme + ss	BM, 2bme + ss	BM, 2bme
Abdomen	I	BM, bme	BM, bme + ss	BM, bme	BM, bm, m
II	BM, bme	BM, bme + ss	BM, bme	BM, bm, m
III	BM, bme	BM, bme + ss	BM, bme	BM, bm, bme
IV	BM, m	2BM, bme + ss	2BM, M, bme
V	BM	ss + 2BM
VI	7

Figs. 4–6. Americanura denisi sp. nov. 4, antennal dorsal chaetotaxy; 5, head and thorax chaetotaxy; 6, abdominal chaetotaxy. Table 3. Demi head chaetotaxy of Americanura denisi sp. nov. +/- indicates presence/absence.

Head setae group	Tubercles	Number of setae	Kind of setae	Setae
Cl	—	2	BM, m	FG
Af	—	2	BM	AB
Oc	—	2	BM	Ocm, Ocp
Di	+	1	BM	Di1
De	+	1	BM	De1
DL + L + So	1	6	2BM, M, 3m	6
Total	3	14

Table 4. Chaetotaxy of Americanura denisi sp. nov. by demitergite. +/- indicates presence/absence.

Body part	Demitergite	Di	De	DL	L
Thorax	I	—	BM	BM	—
II	BM	BM + ss	2BM, me + ss	3BM
III	BM	BM + ss	2BM + ss	2BM, m
Abdomen	I	BM	BM + ss	BM	BM, m
II	BM	BM + ss	BM	BM, m
III	BM	BM + ss	BM	2BM, m
IV	BM	2BM + ss	BM, m
V	BM	BM + ss
VI	7

REMARKS Americanura denisi sp. nov. has short and not heavily barbulated setae, Di setae formula 011/1111, presents cephalic setae “A”, has 2 ocular setae and there is not any fusion of DL and L tubercles on Abd III and IV . In addition, it has 2 setae between the ss of Abd V . Americaura denisi sp. nov. is very closely related to one group of species that share a similar reduced chaetotaxy of the thorax and abdomen: A. banksi ( Denis, 1933 ) , A. bara ( Christiansen and Bellinger, 1980 ) , A. castagnorum Palacios-Vargas, Simón Benito, Paniagua Nuncamendi, 2009, A. interrogator ( Cassagnau and Palacios-Vargas, 1983 ) , A. setafoliacea ( Cassagnau and Palacios-Vargas, 1983 ) , and A. sotanophila ( Cassagnau and Palacios-Vargas, 1983 ) . It differs very clearly from A. setafoliacea from Los Tuxtlas, Veracruz ( Mexico ), which has palmate setae on head and thorax, and from A. sotanophila from Querétaro ( Mexico ), which is much smaller ( 0.9 mm ) and has only 1 + 1 seta between the ss on Abd V . Americaura denisi sp. nov. differs from A. castagnorum from Panama in having a more abundant cephalic chaetotaxy (with head seta A and Ocp). Head tubercles Di, De and L are not well developed and are fused. Differences among these new species and the most similar taxa are shown in Table 5 . Variation: The presence of 2 abdominal bifurcate setae in 1 specimen was the most outstanding variation observed.