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Keys and Bibliography to the Collembola

Sub-Order Symphypleona Börner, 1901

Sub-Order Symphypleona Börner, 1901

Family Actaletidae Wahlgren, 1909

This sub-family contains only the one genus, Actaletes Giard, 1889 (486).

Family Neelidae Folsom, 1896

Megalothoracidae Börner, 1900

Key to the Genera of the Neelidae
1. Ant. IV with four short olfactory setae; thoracic sensorial areas rudimentary, without setiferous tubercles or marginal setae; abdominal sensorial areas absent; anterior surface of dens II with one basal decurrent seta and three sub-apical setae; posterior face with three external spines, one central seta, and three sub-apical setae Neelides Caroli, 1912 (208)
Ant. IV with single large sensilla; well-developed sensorial areas, with setiferous tubercles and marginal setae present on thorax and abdomen; anterior face of Dens II with three plate-like spines (fanerae) in a transverse sub-apical row 2
2. Ventral tube with posterior lobe; posterior face of Dens II with three external denticules, one central seta, and two internal denticules; anterior face with one median seta and a strong terminal spiniform process to each side Neelus Folsom, 1896 (436)
Ventral tube without posterior lobe; posterior face of Dens II with two external spines, one central seta, and two internal spines; anterior face with three denticles in a transverse sub-apical row Megalothorax Willem, 1900 (1133)
=Amerus Collinge and Shoebotham, 1909 (262)

Family Sminthuridae Lubbock, 1870
Sub-Family Sminthuridinae Börner, 1906
Tribe Sminthuridini Börner, 1913

page 29

Genus Sminthurides Börner, 1900 (135)

Prosminthurus Willem, 1900 (1159)

Key to the Sub-Genera of the Genus Sminthurides
1. Tibiotarsal organ, consisting of two sacs and a large spine, present on hind pair of legs 2
Tibiotarsal organ absent 3
2. Mucronal edges lamellate, the inner lamella toothed and ribbed; mucro usually broad Sminthurtdes Börner, 1900 (135)
Mucronal edges without true lamellae, the dorsal inner edge toothed only; mucro slender and narrowing in the apical third Stenacidia Börner, 1906 (147)
3. Lateral basal mucronal bristle present Denisiella Folsom & Mills, 1938 (470)
Lateral basal mucronal bristle absent Sphaeridia Linnaniemi, 1912 (690)

Tribe Katiannini Börner, 1913

Key to the Genera of the Katiannini
1. Clavate tenent hairs generally present 2
Clavate tenent hairs absent; Ant IV subdivided; ocelli, eight to each side or reduced in number; dens posteriorly and laterally with short spines or spine-tike setae Arrhopolites Börner, 1906 (147)
2. Ant. IV subdivided; Ant III with sensory organ which may be peg-like or wart-like in form 3
Ant. IV not subdivided; sense organ. Ant III, wart-like 9
3. With spine-like setae on top of head; Ant. III with long, strong setae 4
Without spine-like setae on top of head; setae of Ant III normal 5
4. Spine-like setae on head serrated; setae of body and appendages long and serrated; Ant. III without peg-like organ; Abd. V with a long sensory hair to each side Novokatianna Salmon, 1944 (917)
Spine-like setae on head simple; setae of body and appendages long but simple; Ant III with peg-like organ; Abd. V with a short sensory seta to each side Katianna Börner, 1906 (147)
5. With short dagger-like spines on dorsum 6
Without such spines; normal setae on dorsum 7
6. With large protuberances on flanks of larger part of body Longkingia Salmon, 1946 (920)
Without such protuberances Parakatianna Womersley, 1932 (1163)
7. With bothriotrichia on larger part of body 8
Without bothriotrichia on larger part of body Metakatianna Denis, 1933 (374)
8. With the trichobothria of genital segment greatly enlarged and protruding; sparsely clothed on body, with short, usually curved, simple setae Pseudokatianna Salmon, 1944 (917)
Trichobothria of genital segment normal; clothing uniform of moderately long, simple setae Polykatianna Salmon, 1946 (920)
9. Filaments of ventral tube smooth; claw without tunica * Sminthurinus Börner, 1901 (140)
=Smynthurella Houlbert, 1924 (597)
Filaments of ventral tube with warted walls; claw with tunica Neosminthurus Mills, 1934 (764)

* On page 157 of his "Thysanoures, Dermapteres, et Orthopteres de France et de la Faune Européene," Houlbert states that he considers it unreasonable to continue to classify the genus Sminthurinus Börner in a sub-family other than that to which it has given its name, and proposes, accordingly, that the genus Sminthurinus Börner be known henceforth as Smynthurella Houlbert Such an arbitrary change of name, however, cannot be allowed under the Rules of Zoological Nomenclature, and the name Smynthurella becomes a synonym of Sminthurinus.

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Sub-Family Dicyrtominae Börner, 1906

Key to the Genera of the Dicyrtominae
1. With a distinct tunica to the claw; Ant. III and Ant. IV not subdivided or annulated but generally with warts or tuberculate out-growths; with or without serrated setae on the dens Dicyrtomina Börner, 1903 (144)
Without a tunica to the claw 2
2. Ant III and Ant. IV not subdivided but with indistinct annulations; antennae generally with warts or tuberculate outgrowths; with or without serrated setae on the dens Dicyrtoma Bourlet, 1842 (161)
=Papirius Lubbock, 1862 (705)
Ant III or Ant. III and Ant. IV distinctly subdivided; with serrated setae on the dens 3
3. With a club-like prominence on the dorsal surface; serrated setae of the dens only obscurely serrated near base of each seta Papiriodes Folsom, 1924 (463)
Without dorsal prominence; setae of dens distinctly serrated Ptenothrix Börner, 1906 (147)

Sub-Family Sminthurinae Börner, 1906

Tribe Bourletiellini Börner, 1913

Key to the Genera of the Bourletiellini
1. With a clasping organ consisting of hooks or curved bristles on the genital segment of the male; body globular, rounded dorso-longitudinally Bourletiella Banks, 1899 (90)
Without clasping organ; body more elongate, flattened dorso-longitudinally 2
2. With swellings or protuberances on dorsal surface of body 3
Without swellings or protuberances on dorsal surface of body 4
3. Unguiculus filiform; male with large dome-like swellings on top of head Bovicornia Delamare-Deboutteville, 1947 (319)
Unguiculus replaced by accessory clavate hair; dorsal surface of body with swellings or protuberances Corynephoria Absolon, 1907 (19)
4. With group of strong spines (rastral organ) on hind tibiotarsus 5
Without rastral organ 6
5. Spines of rastral organ simple or serrate and arranged in rows Rastriopes Börner, 1906 (147)
Spines of rastral organ simple and not arranged in rows Prorastriopes Delamare-Deboutteville, 1947 (319)
6. Claw with tunica Eusminthurus Börner, 1900 (135)
Claw without tunica Deuterosminthurus Börner, 1901 (140)
=Deuterosminturus Börner, 1901 (140)

Tribe Sminthurini Börner, 1913

Key to the Genera of the Sminthurini
1. With 4–5 long, strong setae, much longer and stronger than the rest on the basal half of Ant III 2
Without long, strong setae; the setae of Ant III approximately equal; claw without tenent hairs 3page 31
2. Dorsal edges of mucro equal; mucro with or without bristle; dorsal glands absent from furcal segment * Sminthurus Latreille, 1804 (661)
Dorsal edges of mucro unequal; mucro with bristle; furcal segment with two round fine-pored glandular openings on dorsal surface Allacma Börner, 1906 (147)
3. Claw with tunica 4
Claw without tunica Parrhopalites Bonet and Teller, 1947 (134)
4. Genital segment with two bothriotrichia Sphyrotheca Börner, 1906 (147)
Genital segment without bothriotrichia Lipothrix Börner, 1906 (147)

* The original spelling of this generic name as given by Latreille in 1804, when he founded the genus was Smynthurus It would appear to have been derived from the Greek words Sminthos (meaning a mouse) and oura (a tail), in which case the amendment which has been made by most authors to the spelling Sminthurus is grammatically correct and allowable under the International Rules of Zoological Nomenclature.