Campylothorax dominicanus, Felipe N. Soto-Adames, 2016

Felipe N. Soto-Adames, 2016, Chaetotaxy of first-instar Campylothorax sabanus (Wray), and description of three new Campylothorax species from Hispaniola (Collembola, Paronellidae), Journal of Natural History 50 (25), pp. 1583-1612 : 1602-1605

Campylothorax dominicanus sp. nov.

Figures 10 – 11

Etymology

The epithet refers to the apparent widespread distribution of the species in the northeastern section of the Dominican Republic.

Material examined

Holotype, slide-mounted, Dominican Republic, La Vega, Cordillera Central, Loma Casabito, 15.8 km NW, Bonao, 19°2'11.976''N, 70°31'8.0034''W, 1455 m elevation, evergreen cloud forest, yellow pan trap, 28 May 2003, sample DR21262, J. Rawlins, C. Young, R. Davidson, C. Núñez, P. Acevedo; one paratype in preparation and one juvenile in alcohol same collection data as holotype; two indviduals in alcohol, Duarte, Reserva Loma Quita Espuela, Canelo, 13.2 km NNE San Francisco de Macoris, 19°24'46.044''N, 70°9'52.02''W, edge of broadleaf forest, yellow pan trap, 6 April 2006, sample DR11263, C. Young, R. Davidson, J. Rawlins; two individuals in alcohol, poor condition, Cordillera Central, Reserva Valle Nuevo, La Nevera, 15.1 km SE Valle Nuevo, 18°41'47.04''N, 70°35'30.0114''W, 2252 m elevation, montane meadow in cloud pine forest, yellow pan trap, 3 June 2003, sample DR24462, R. Davidson, C. Young, C. Núñez, J. Rawlins, P. Acevedo, M. de la Cruz.

Size. Up to 2.2 mm.

Colour pattern. Background colour white ( Figure 10 A); dark purple pigment evenly distributed on basal two-thirds of antennae, head, body, legs and manubrium; most intense on posterior three-quarters of Abd. 4; anterior margin of Abd. 4 with short, irregular, white or light blue longitudinal stripes ( Figure 10 B).

Head. Dorsal head chaetotaxy as in C. sabanus ( Figure 1 B) with eight Mc along antennal margin and four other Mc along inner eye patch margin; with one unpaired (A0) and seven paired anterior (A2, A3, A5, S2, S3, S4, S5), and one posterior (Pa5) Mc. Pre-labral chaetae smooth. Maxilla lamella 1 and 2 as in C. notidanus sp. nov. Lateral appendage of labial papilla E long, reaching tip of papilla. Number of chaeta along cephalic groove unclear, apparently six.

Body. Body Mc as 74/0241+7+0+5. Th. 2 dorsally flat; Th. 3 rounded, relatively short, partially covering central section of Abd. 1. Th. 2 with seven Mc in p3 complex; Th. 3 with four Mc in p2 – 3 complex. Abd. 3 with 3 + 2 lateral mesochaetae as in C. notidanus sp. nov. Inner section of Abd. 4 with anterior triangle formed by paired A1 and medial unpaired Mc; inner posterior Mc 6 + 6 organised as in Figure 11 A; Mc A3 inserted posterior to pseudopore. Lateral section of Abd. 4 with five large Mc (E2, E3, E4, F1, F2) and three other, smaller latero-posterior Mc; E4 inserted anterior to D2; F3 absent; posterior chaetae 16 + 16.

Legs. Trochanteral organ with up to 26 chaetae. All tenent hairs spatulate, relatively short, reaching down to level of paired inner ungual teeth ( Figure 11 B). All claws with two inner teeth and two outer teeth: inner teeth subequal, inserted on basal half of all legs; lateral teeth short, often obscured, inserted on basal quarter of outer edge; dorsal tooth absent. Unguiculus of all legs truncate, with one inner tooth; unguiculus on fore and middle legs shorter than on hind legs.

Furcula. Mucro typical for genus, 2.3 – 2.4 times as long as inner edge of hind claw.

Remarks

Campylothorax dominicanus sp. nov. is the only member of the genus with the combination of an evenly pigmented purple body and Abd. 4 with short anterior white stripes, Abd. 4 lateral Mc F3 absent, unguis with two inner teeth and tenent hair reaching only to the level of inner ungual teeth. Dark specimens of C. sabanus , C. cubanus Gruia, 1983 and C. mitrai are similar to C. dominicanus sp. nov., but the absence of Mc F2 and presence of only two inner ungual teeth distinguishes the new species. The pattern of white stripes on Abd. 4 is similar to that of C. longicornis Schött, 1893 but the Cameroonian species has antero-medial multiplets (brow) on Abd. 4.

This seems to be the most common species on the northeastern section of the Dominican Republic, and the only one found at low elevations.

Figures

Figure 1. Campylothtorax sabanus dorsal chaetotaxy. (A) Head, first instar. (B) Head, adult. (C) Thorax, first instar. (D) Thorax, adult. (E) First abdominal segment, first instar; arrow points at spurious chaeta present on one side of one specimen. (F) First abdominal segment, adult. In all figures, open circles represent Mc and closed circles microchaetae, circles with cross lines are pseudopores.

Figure 10. Campylothtorax dominicanus sp. nov. (A) Habitus. (B) Detail of fourth abdominal pattern.

Figure 11. Campylothtorax dominicanus sp. nov. (A) Latero-posterior chaetotaxy of fourth abdominal segment. (B) Hind claw complex.