Tomocerus (Plutomurus) grahami n.sp. is described from Terrero Cave, Terrero, Santa Fe Co., New Mexico. It is the fourth species of the subgenus recorded from North America

Christiansen, K. A.

English

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A New Nearctic Species of the Genus Tomocerus (Collembola: Entomobryidae).

University of Northern Iowa

Proceedings of the Iowa Academy of Science Volume 87 Number Article 3 1980 A New Nearctic Species of the Genus Tomocerus (Collembola: Entomobryidae). K. A. Christiansen Grinnell College Copyright ©1980 Iowa Academy of Science, Inc. Follow this and additional works at: https://scholarworks.uni.edu/pias Recommended Citation Christiansen, K. A. (1980) "A New Nearctic Species of the Genus Tomocerus (Collembola: Entomobryidae).," Proceedings of the Iowa Academy of Science, 87(4), 121-123. Available at: https://scholarworks.uni.edu/pias/vol87/iss4/3 This Research is brought to you for free and open access by the Iowa Academy of Science at UNI ScholarWorks. It has been accepted for inclusion in Proceedings of the Iowa Academy of Science by an authorized editor of UNI ScholarWorks. For more information, please contact scholarworks@uni.edu. Proc. IowaAcad. Sci. 87(4):121-123. 1980 A New Nearctic Species of the Genus Tomocerus (Collembola: Entomobryidae). K.A. CHRISTIANSEN Department of Biology, Grinnell College, Grinnell, Iowa 50112 Tomocerus (Plutomurus) grahami n.sp. is described from Terrero Cave, Terrero, Santa Fe Co., New Mexico. It is the fourth species of the subgenus recorded from North America. INDEX DESCRIPTORS: Collembola, Tomocerus (Plutomurus) grahami, North America, speleology. Many new species of Collembola were discovered in the course of preparing a monograph on the Collembola of North America. One of these was a southwestern cave form belonging to the genus Tomocerus, subgenus Plutomurus. The subgenus is widespread in Asia but does not oc:cur east of the great plains in North America. The new species represents the easternmost cave record of the subgenus. DESCRIPTION Tomocerus (Plutomurus) grahami n.sp. Color white with suffusion of blue grey pigment overtergites of body and dorsum of head. Antenna normal for genus, about 3 times as long as cephalic diagonal. Corneas absent but eye regions may have pair of small patches of blue pigment ( 1 specimen) where eyes normally occur. Labrum with anterior marginal setae short stout and curved upward. Prelabial setae 3 + 3. Feet with pseudonychia well developed, 1/3 to 5/9 as long as inner unguis. Unguis with 3, rarely 4, inner teeth. Tenent hairs weakly to moderately clavate. Unguiculus with 2-3 minute inner seta-like teeth. Prothoracic and mesothoracic tibiotarsi without spine-like setae. Metathoracic tibiotarus with a single heavy inner spine-like seta. Trochanteral organ well developed on hind leg with 14-23 setae on trochanter and 25-49 on femur. All parts of ventral tube heavily setace-ous. Tenaculum with 4 teeth and single heavy seta on corpus. Manub-rium without spine-like setae. Dental formula 2-4, 1-2, 1-2, 1, l-3, 1, 2, 1. Dental spines simple not striate. Inner dental scale absent. Outer margins of dens with 2 heavy spine-like setae. Base <'ff den with 2 teeth, both on dorsal surface and equipped with small lamella. One or 2 intermediate teeth without lamellae, varying in position. Mucro with l seta projecting prominently beyond apex. Dorsal body with 2-3 anterior macrochaetae and l posterior microchaeta, frequently the anterior setae are knocked off or absent. Bothriotrichia with an anterior band of 5 microchaetae. Other organs as illustrated. Table 1. Measurements of Type Specimens of Tomocerus (P.) Grahami. * Holotype Paratype Para type Para type Paratype Para type Paratype male male 1 female 2 female 3 female 4 male 5 female 6 Cephalic diagonal .56 .728 .714 .840 .672 .700 .570 Thorax 2 .509 .560 .605 .580 .637 .616 .448 Thorax 3 .371 .336 .381 .336 .325 Abdomen 1 .224 .185 .235 .280 .224 Abdomen 2 .336 .392 .381 .392 .347 .319 Abdomen 3 .515 .549 .616 .504 .515 .471 Abdomen 4 .381 .392 .448 .476 .476 .347 Abdomen 5 .179 .235 .224 .224 .146 Abdomen 6 .101 . l 15 . l 12 .123 .123 .101 Hind femur .403 .459 .464 .449 .504 .450 392 Hind tibiotarsus .627 .717 .717 . 711 .794 .728 .588 Hind inner unguis .090 .095 .096 .095 .098 .095 .078 Hind unguiculus .050 .055 .058 .050 .053 .051 .045 Hind tenent hair .039 .045 .045 .045 .050 .042 .037 Manubrium .448 .418 .560 .504 .570 .561 .437 Dens .706 .773 .895 .773 .773 .806 .644 Mucro .146 .146 .157 .152 .151 .146 .128 *All measurements in mm; segmental measurements taken along mid-line. 1Christiansen: A New Nearctic Species of the Genus Tomocerus (Collembola: EntomoPublished by UNI ScholarWorks, 1980122 PROC. IOWA ACAD. SCI. 87 (1980) D F G 2Proceedings of the Iowa Academy of Science, Vol. 87 [1980], No. 4, Art. 3https://scholarworks.uni.edu/pias/vol87/iss4/3NEW NEARCTIC SPECIES 123 \ L Figure 2. Tomocerus (P) grahami n. sp. I) Ventral tube showing frontal setae, paratype 5; J) Ventral tube showing distal and posterior setae, paratype l; K) Labrum as seen from above, paratype 6; L) Microchaetae surrounding bothriotrichium and macrochaeta of 4th abdominal segment, holotype. Type Locality: Terrero Cave, Terrero, Santa Fe Co., New Mexico, 8-11-1975, N. Welboum collector. Holotype male, 1st paratype male, and 2nd and 3rd paratype females deposited in the Museum of Com-parative Zoology, Cambridge, Massachusetts; 4th paratype female deposited in the U.S. National Museum of Natural History, Washing-ton, D.C.; 5th paratype male and 6th paratype female in the author's collection. DISCUSSION This is the fourth species of the subgenus Plutomurus known from North America. The new species bears some similarity to the Asiatic species described by Yosii (1967) and Martinova (1969); however, its closest relative is clearly Tomocerus (P.) calif ornicus Folsom. It can readily be distinguished from this species by the small number of intermediate mucronal teeth. In addition, californicus has lateral man-ubrial spines (see Christiansen 1964) which are absent in grahami. There are additional differences in the chaetotaxy of the body and foot structure. The tenaculum, anterior labral margin, and mucro of this species resemble those of Tomocerus (P.) carpaticus (Rusek and Weiner); however, it differs in most other characteristics. The chaetotaxy of the 7 specimens was not clearly seen so that there is some question about its distribution, particularly on the thoracic region. This new species is named in honor of my colleague Benjamin Graham. REFERENCES CHRISTIANSEN, K.A. 1964. A revision of the nearctic members of the genus Tomocerus. Rev. Ecol. Biol. Sol J: 639-678. MARTYNOV A, E. 1969. Springtails of the family Tomoceriae from the fauna of the U.S.S.R. Rev. Entomol. U.S.S.R. 68: 299-315. RUSEK, T., and W. WEINER. 1977. Plutomurus carpaticus sp.n. from the Carpathian Mts. Bull. Polish Acad. Sci. 25: 741-747. YOSll, R. 1967. Studies of the collembolan family Tomoceridae with special reference to Japanese forms. Contrib. Biol. Lab., Kyoto University, No. 20: 54 pp. Figure 1. Tomocerus (P.) grahami n. sp. A) Habitus, with distribution of dorsal macrochaetae and bothriotrichia, composite drawing; B) Mucro, paratype 5; C) Right maxilla, paratype 5; D) Basal outer dental spine right side, paratype l; E) Base of dentes seen from one side and above, paratype 6; F) Hind tibiotarsus as seen from side, showing marginal setae, paratype 4; G) Trochanteral organ of hind leg, paratype 2; H) "forefoo\ 1:.om~\c"Y.., ~\\tatype 6. 3Christiansen: A New Nearctic Species of the Genus Tomocerus (Collembola: EntomoPublished by UNI ScholarWorks, 1980

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A New Nearctic Species of the Genus Tomocerus (Collembola: Entomobryidae).

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