http://www.collembola.org/key/american.htm - Last updated on 2009.09.30 by Frans Janssens

Checklist of the Collembola: Key to the species of Americanura

This key is still under construction. Note that missing figures will be provided as soon as possible. Currently, the key is in the feasibility study phase to find out how to integrate in the checklist in a modular way a key that has been generated with DELTA.

José G. Palacios-Vargas, Ecología y Sistemática de Microartrópodos, Departamento de Ecología y Recursos Naturales, Facultad de Ciensas, UNAM, 04510 México D.F.
José C. Simón Benito, Unidad de Zoología, Facultad de Ciencias, Universidad Nacional Autónoma de Madrid, 28049, Canto Blanco, Madrid, España.
Jorge Paniagua Nucamendi, Ecología y Sistemática de Microartrópodos, Departamento de Ecología y Recursos Naturales, Facultad de Ciensas, UNAM, 04510 México D.F.
Frans Janssens, Department of Biology, University of Antwerp, Antwerp, B-2020, Belgium

Rationale

Key

1(0). Eyes 2 + 2 (fig.1).......................................... 2 Eyes absent.............................................. nova
Fig.1.
2(1). Cephalic seta "A" absent.................................... 3 Cephalic seta "A" present (fig.2)......................... 12
Fig.2.
3(2). Prethoracic dorso-external tubercle with 1 seta (fig.3a).... 4 Prethoracic dorso-external tubercle with 2 setae (fig.3b)... 9
Fig.3.
4(3). Body setae barbed (fig.4b) or palmate; cephalic dorso-external tubercle with 1 seta; ocular tubercle with less than 3 setae......................................... 5 Body setae smooth (fig.4a); cephalic dorso-external tubercle with 3 setae; ocular tubercle with 3 setae............. bara
Fig.4.
5(4). Ocular tubercle with 1 seta (fig.5a)....................... 6 Ocular tubercle with 2 setae (fig.5b)...................... 7
Fig.5.
6(5). Dorso-internal tubercle of fifth abdominal segment with 1 seta; body setae palmate; mesothoracic and metathoracic dorso-lateral tubercle with 1 seta............. guatemalteca Dorso-internal tubercle of fifth abdominal segment with 3 setae ???; body setae barbed (fig.6); mesothoracic and??? metathoracic dorso-lateral tubercle with 2 setae (fig.7).... ............................................... castagnorum
Fig.6.
Fig.7.
7(5). Dorso-external and dorso-lateral tubercle of first abdominal segment with 1 seta; body setae distinctly palmate or serrate................................................... 8 Dorso-external and dorso-lateral tubercle of first abdominal segment with 2 setae (fig.8); body setae weakly barbed (fig.9)............................................. basseti
Fig.8.
Fig.9.
8(7). Lateral tubercle of first abdominal segment to third abdominal segment with 2 setae; mesothoracic and metathoracic dorso-lateral tubercle with 1 seta; dorsal setae mostly palmate........................................ setafoliacea Lateral tubercle of first abdominal segment to third abdominal segment with 3 setae; mesothoracic and metathoracic dorso-lateral tubercle with 2 setae; dorsal setae mostly serrate......................................... sotanophila
9(3). Ocular tubercle with 3 setae (fig.10)............ sardinasensis Ocular tubercle with less than 3 setae..................... 10
Fig.10.
10(9). Ocular tubercle with 1 seta................................ 11 Ocular tubercle with 2 setae........................ medellini
11(10). Cephalic dorso-external tubercle with 1 seta; mesothoracic dorso-internal tubercle with 2 setae.............. izabalana Cephalic dorso-external tubercle with 3 setae; mesothoracic dorso-internal tubercle with 3 setae............. macgregori
12(2). Ocular tubercle with 2 setae............................... 13 Ocular tubercle with 3 setae............................... 16
13(12). Mesothoracic and metathoracic dorso-internal tubercle with 3 setae; prethoracic dorso-external tubercle with 2 setae..... ............................................... castillorum Mesothoracic and metathoracic dorso-internal tubercle with less than 3 setae; prethoracic dorso-external tubercle with 1 seta ???............................................... 14
14(13). Dorso-internal tubercle of second thoracic segment to third abdominal segment with 1 seta............................ 15 Dorso-internal tubercle of second thoracic segment to third abdominal segment with 2 setae (fig.11)............ janssensi
Fig.11.
15(14). Fourth abdominal segment with 3 tubercles; lateral tubercle of second abdominal segment and third abdominal segment with 2 setae 140b lateral tubercle of second abdominal segment and third abdominal segment with 2 setae........... interrogator Fourth abdominal segment with 4 tubercles; lateral tubercle of second abdominal segment and third abdominal segment with 2 setae 140a lateral tubercle of second abdominal segment and third abdominal segment with 2 setae................. banksi
16(12). Cephalic dorso-external tubercle with 2 setae; unguis with 1 large internal tooth.............................. unguimitl Cephalic dorso-external tubercle with 3 setae; unguis without internal tooth........................................... 17
17(16). Body setae all smooth; ocular setae smooth.............. prima Body setae mostly barbed; ocular setae at least 1 barbed... 18
18(17). Dorso-external tubercle of fourth abdominal segment with 2 setae; dorso-internal tubercle of fifth abdominal segment with 2 setae....................................... mexicana Dorso-external tubercle of fourth abdominal segment with 3 setae; dorso-internal tubercle of fifth abdominal segment with 4 setae............................................. 19
19(18). Tubercles of fourth abdominal segment and fifth abdominal segment fused...................................... imitator Tubercles of fourth abdominal segment and fifth abdominal segment not fused (fig.12)............................. iztac
Fig.12.

Differential diagnoses

banksi
Cephalic seta "A" present (fig.2). Dorso-internal tubercle of second thoracic segment to third abdominal segment with 1 seta. Eyes 2 + 2 (fig.1). Fourth abdominal segment with 4 tubercles. Lateral tubercle of second abdominal segment and third abdominal segment with 2 setae 140a lateral tubercle of second abdominal segment and third abdominal segment with 2 setae. Mesothoracic and metathoracic dorso-internal tubercle with less than 3 setae. Ocular tubercle with 2 setae. Prethoracic dorso-external tubercle with 1 seta ???.

bara
Body setae smooth (fig.4a). Cephalic dorso-external tubercle with 3 setae. Cephalic seta "A" absent. Eyes 2 + 2 (fig.1). Ocular tubercle with 3 setae. Prethoracic dorso-external tubercle with 1 seta (fig.3a).

basseti
Body setae weakly barbed (fig.9). Body setae barbed (fig.4b) or palmate. Cephalic dorso-external tubercle with 1 seta. Cephalic seta "A" absent. Dorso-external and dorso-lateral tubercle of first abdominal segment with 2 setae (fig.8). Eyes 2 + 2 (fig.1). Ocular tubercle with less than 3 setae. Ocular tubercle with 2 setae (fig.5b). Prethoracic dorso-external tubercle with 1 seta (fig.3a).

castagnorum
Body setae barbed (fig.6). Body setae barbed (fig.4b) or palmate. Cephalic dorso-external tubercle with 1 seta. Cephalic seta "A" absent. Dorso-internal tubercle of fifth abdominal segment with 3 setae ???. Eyes 2 + 2 (fig.1). Mesothoracic and??? metathoracic dorso-lateral tubercle with 2 setae (fig.7). Ocular tubercle with less than 3 setae. Ocular tubercle with 1 seta (fig.5a). Prethoracic dorso-external tubercle with 1 seta (fig.3a).

castillorum
Cephalic seta "A" present (fig.2). Eyes 2 + 2 (fig.1). Mesothoracic and metathoracic dorso-internal tubercle with 3 setae. Ocular tubercle with 2 setae. Prethoracic dorso-external tubercle with 2 setae.

guatemalteca
Body setae palmate. Body setae barbed (fig.4b) or palmate. Cephalic dorso-external tubercle with 1 seta. Cephalic seta "A" absent. Dorso-internal tubercle of fifth abdominal segment with 1 seta. Eyes 2 + 2 (fig.1). Mesothoracic and metathoracic dorso-lateral tubercle with 1 seta. Ocular tubercle with less than 3 setae. Ocular tubercle with 1 seta (fig.5a). Prethoracic dorso-external tubercle with 1 seta (fig.3a).

imitator
Body setae mostly barbed. Cephalic dorso-external tubercle with 3 setae. Cephalic seta "A" present (fig.2). Dorso-external tubercle of fourth abdominal segment with 3 setae. Dorso-internal tubercle of fifth abdominal segment with 4 setae. Eyes 2 + 2 (fig.1). Ocular setae at least 1 barbed. Ocular tubercle with 3 setae. Tubercles of fourth abdominal segment and fifth abdominal segment fused. Unguis without internal tooth.

interrogator
Cephalic seta "A" present (fig.2). Dorso-internal tubercle of second thoracic segment to third abdominal segment with 1 seta. Eyes 2 + 2 (fig.1). Fourth abdominal segment with 3 tubercles. Lateral tubercle of second abdominal segment and third abdominal segment with 2 setae 140b lateral tubercle of second abdominal segment and third abdominal segment with 2 setae. Mesothoracic and metathoracic dorso-internal tubercle with less than 3 setae. Ocular tubercle with 2 setae. Prethoracic dorso-external tubercle with 1 seta ???.

izabalana
Cephalic dorso-external tubercle with 1 seta. Cephalic seta "A" absent. Eyes 2 + 2 (fig.1). Mesothoracic dorso-internal tubercle with 2 setae. Ocular tubercle with less than 3 setae. Ocular tubercle with 1 seta. Prethoracic dorso-external tubercle with 2 setae (fig.3b).

iztac
Body setae mostly barbed. Cephalic dorso-external tubercle with 3 setae. Cephalic seta "A" present (fig.2). Dorso-external tubercle of fourth abdominal segment with 3 setae. Dorso-internal tubercle of fifth abdominal segment with 4 setae. Eyes 2 + 2 (fig.1). Ocular setae at least 1 barbed. Ocular tubercle with 3 setae. Tubercles of fourth abdominal segment and fifth abdominal segment not fused (fig.12). Unguis without internal tooth.

janssensi
Cephalic seta "A" present (fig.2). Dorso-internal tubercle of second thoracic segment to third abdominal segment with 2 setae (fig.11). Eyes 2 + 2 (fig.1). Mesothoracic and metathoracic dorso-internal tubercle with less than 3 setae. Ocular tubercle with 2 setae. Prethoracic dorso-external tubercle with 1 seta ???.

macgregori
Cephalic dorso-external tubercle with 3 setae. Cephalic seta "A" absent. Eyes 2 + 2 (fig.1). Mesothoracic dorso-internal tubercle with 3 setae. Ocular tubercle with less than 3 setae. Ocular tubercle with 1 seta. Prethoracic dorso-external tubercle with 2 setae (fig.3b).

medellini
Cephalic seta "A" absent. Eyes 2 + 2 (fig.1). Ocular tubercle with less than 3 setae. Ocular tubercle with 2 setae. Prethoracic dorso-external tubercle with 2 setae (fig.3b).

mexicana
Body setae mostly barbed. Cephalic dorso-external tubercle with 3 setae. Cephalic seta "A" present (fig.2). Dorso-external tubercle of fourth abdominal segment with 2 setae. Dorso-internal tubercle of fifth abdominal segment with 2 setae. Eyes 2 + 2 (fig.1). Ocular setae at least 1 barbed. Ocular tubercle with 3 setae. Unguis without internal tooth.

nova
Eyes absent.

prima
Body setae all smooth. Cephalic dorso-external tubercle with 3 setae. Cephalic seta "A" present (fig.2). Eyes 2 + 2 (fig.1). Ocular setae smooth. Ocular tubercle with 3 setae. Unguis without internal tooth.

sardinasensis
Cephalic seta "A" absent. Eyes 2 + 2 (fig.1). Ocular tubercle with 3 setae (fig.10). Prethoracic dorso-external tubercle with fig.10 setae (fig.3b).

setafoliacea
Body setae distinctly palmate or serrate. Body setae barbed (fig.4b) or palmate. Cephalic dorso-external tubercle with 1 seta. Cephalic seta "A" absent. Dorsal setae mostly palmate. Dorso-external and dorso-lateral tubercle of first abdominal segment with 1 seta. Eyes 2 + 2 (fig.1). Lateral tubercle of first abdominal segment to third abdominal segment with 2 setae. Mesothoracic and metathoracic dorso-lateral tubercle with 1 seta. Ocular tubercle with less than 3 setae. Ocular tubercle with 2 setae (fig.5b). Prethoracic dorso-external tubercle with 1 seta (fig.3a).

sotanophila
Body setae distinctly palmate or serrate. Body setae barbed (fig.4b) or palmate. Cephalic dorso-external tubercle with 1 seta. Cephalic seta "A" absent. Dorsal setae mostly serrate. Dorso-external and dorso-lateral tubercle of first abdominal segment with 1 seta. Eyes 2 + 2 (fig.1). Lateral tubercle of first abdominal segment to third abdominal segment with 3 setae. Mesothoracic and metathoracic dorso-lateral tubercle with 2 setae. Ocular tubercle with less than 3 setae. Ocular tubercle with 2 setae (fig.5b). Prethoracic dorso-external tubercle with 1 seta (fig.3a).

unguimitl
Cephalic dorso-external tubercle with 2 setae. Cephalic seta "A" present (fig.2). Eyes 2 + 2 (fig.1). Ocular tubercle with 3 setae. Unguis with 1 large internal tooth.

References