Checklist of the Collembola: Key to the superfamilies of Poduromorpha

http://www.collembola.org/key/podurpha.htm - Last updated on 2024.08.31 by Frans Janssens

Checklist of the Collembola: Key to the superfamilies of Poduromorpha

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.

Kenneth A. Christiansen, Department of Biology, Grinnell College, PO Box V3, Grinnell, IA 50112-0806, USA
Frans Janssens, Department of Biology, University of Antwerp, Antwerp, B-2020, Belgium

Rationale

The rationale for taxa used and not used as well as subtaxonomic classification for some taxa is to be provided.

Key

Note that no distinction between subtaxa and taxa is made in the key.

1(0). Dentes absent or vestigial or when present relatively short and not ringed (fig.1b)................................... 2 Dentes more than 3 times as long as manubrium, with distal rings of granules (fig.1a)....................... Poduroidea

Fig.1.

2(1). Apical organ of fourth antennal segment absent or without many blunt projections......................................... 3 Apical organ of fourth antennal segment with many blunt projections (fig.2)......................... Gulgastruroidea

Fig.2.

3(2). Sense organ of third antennal segment complex with at least six elements, 4-5 outer papillae and 1-3 inner sense structures (fig.3a)....................................... 4 Sense organ of third antennal segment with at most two or three protective papillae and two inner sensory structures (fig.3b), or with the organ divided into a dorsal and ventral section, each bearing more than 2 structures...... 6

Fig.3.

4(3). Abdomen with lateral projections (fig.4)..................... .......................................... Hypogastruroidea ² Abdomen without lateral projections......................... 5

Fig.4.

5(4). Postantennal organ absent.................... Hypogastruroidea ¹ Postantennal organ present...................... Onychiuroidea ⁵

6(3). Pseudocelli absent or visible only under scanning electron microscope................................................ 7 Pseudocelli present, at least on antennal base (fig.5) and/or or dorsum of fifth abdominal segment.......... Onychiuroidea ⁶

Fig.5.

7(6). Prothoracic tergum with papillae but no setae (fig.6)......... ............................................. Onychiuroidea ⁷ Prothoracic tergum with setae but no papillae............... 8

Fig.6.

8(7). Mandible absent or if present then without molar plate (fig.7b&c)................................................ 9 Mandible present and with molar plate (fig.7a)............. 10

Fig.7.

9(8). Mucro never trilamellate; between stipe and fulcrum of maxilla there is an individualized cardo (fig.7b). Neanuroidea ² Mucro often trilamellate (fig.8); between stipe and fulcrum of maxilla there is no individualized cardo (fig.7c)........... ............................................. Onychiuroidea ⁸

Fig.8.

10(8). Position of anus subterminal.................................. ............. Neanuroidea:Gomphiocephalidae:Gomphiocephalus ³ Position of anus terminal or ventral....................... 11

11(10). Clothing paucichaetomic; anal spines never 3; setae collophore at most 4 + 4; sixth abdominal segment seta a0 absent....... .......................................... Hypogastruroidea Clothing plurichaetomic; anal spines 3: bilateral pair and extra middorsal terminal spine; setae collophore 7-10 + 7-10; sixth abdominal segment seta a0 present............... .............. Onychiuroidea:Triacanthellidae:Triacanthella ⁴

Endnotes

¹ ad partem. Acherongia will key out here.

² ad partem. Pachytullbergiidae.

³ Monogenic family Gomphiocephalidae nom. nov. (type genus =Gomphiocephalus) with tentative status which is the most basic plesiomorph family of the Neanuroidea (infered from Greenslade & al., 2011).

⁴ Monogenic family Triacanthellidae nom. nov. (type genus =Triacanthella) with tentative status of the superfamily Onychiuroidea (= Triacanthellidae+(Odontellidae+(Isotogastruridae+(Tullbergiidae+Onychiuridae)))) which is the most basic plesiomorph superfamily of the Poduromorpha (infered from D'Haese, 2002, 2003; Greenslade & al., 2011).

⁵ ad partem. Onychiuridae.

⁶ ad partem. Tullbergiidae.

⁷ ad partem. Isotogastruridae.

⁸ ad partem. Odontellidae.


1(0). Dentes absent or vestigial or when present relatively short and not ringed (fig.1b)................................... 2 Dentes more than 3 times as long as manubrium, with distal rings of granules (fig.1a)....................... Poduroidea
Fig.1.
2(1). Apical organ of fourth antennal segment absent or without many blunt projections......................................... 3 Apical organ of fourth antennal segment with many blunt projections (fig.2)......................... Gulgastruroidea
Fig.2.
3(2). Sense organ of third antennal segment complex with at least six elements, 4-5 outer papillae and 1-3 inner sense structures (fig.3a)....................................... 4 Sense organ of third antennal segment with at most two or three protective papillae and two inner sensory structures (fig.3b), or with the organ divided into a dorsal and ventral section, each bearing more than 2 structures...... 6
Fig.3.
4(3). Abdomen with lateral projections (fig.4)..................... .......................................... Hypogastruroidea ² Abdomen without lateral projections......................... 5
Fig.4.
5(4). Postantennal organ absent.................... Hypogastruroidea ¹ Postantennal organ present...................... Onychiuroidea ⁵
6(3). Pseudocelli absent or visible only under scanning electron microscope................................................ 7 Pseudocelli present, at least on antennal base (fig.5) and/or or dorsum of fifth abdominal segment.......... Onychiuroidea ⁶
Fig.5.
7(6). Prothoracic tergum with papillae but no setae (fig.6)......... ............................................. Onychiuroidea ⁷ Prothoracic tergum with setae but no papillae............... 8
Fig.6.
8(7). Mandible absent or if present then without molar plate (fig.7b&c)................................................ 9 Mandible present and with molar plate (fig.7a)............. 10
Fig.7.
9(8). Mucro never trilamellate; between stipe and fulcrum of maxilla there is an individualized cardo (fig.7b). Neanuroidea ² Mucro often trilamellate (fig.8); between stipe and fulcrum of maxilla there is no individualized cardo (fig.7c)........... ............................................. Onychiuroidea ⁸
Fig.8.
10(8). Position of anus subterminal.................................. ............. Neanuroidea:Gomphiocephalidae:Gomphiocephalus ³ Position of anus terminal or ventral....................... 11
11(10). Clothing paucichaetomic; anal spines never 3; setae collophore at most 4 + 4; sixth abdominal segment seta a0 absent....... .......................................... Hypogastruroidea Clothing plurichaetomic; anal spines 3: bilateral pair and extra middorsal terminal spine; setae collophore 7-10 + 7-10; sixth abdominal segment seta a0 present............... .............. Onychiuroidea:Triacanthellidae:Triacanthella ⁴

http://www.collembola.org/key/podurpha.htm - Last updated on 2024.08.31 by Frans Janssens

Rationale

Key

References