Entomobrya jubata Katz & Soto-Adames

Katz, Aron D., Giordano, Rosanna & Soto-Adames, Felipe, 2015, Taxonomic review and phylogenetic analysis of fifteen North American Entomobrya (Collembola, Entomobryidae), including four new species, ZooKeys 525, pp. 1-75 : 33-37

Taxon classification Animalia Collembola Entomobryidae

Entomobrya jubata Katz & Soto-Adames sp. n. Figs 16B, 23, 24, 39

Etymology.

The word jubatus is Latin for maned, or crested, and refers to the abundance of dorsal macrosetae on the thoracic segments.

Type material.

Holotype, ♀, USA: Alabama, Covington County, Conecuh National Forest (31.07900,-86.61203), under bark, 2.i.12 (A. Katz & M. DuBray), AK12-9 & AK12-6.

Paratypes, USA: 7 on slides, 20 in vials, Alabama, Covington Co., Conecuh National Forest (31.07900,-86.61203), under bark, 2.i.12 (A. Katz & M. DuBray), AK12-9 & AK12-6.

Description.

Body shape and color pattern. Body cylindrical, slightly dorso-ventrally flattened. Length up to 2 mm. Color pattern monomorphic (Fig. 23): light brown background with black pigment forming dark transverse bands across the posterior margins of Abd. 4, Abd. 5, and Abd. 6; dark pigment present along lateral margins of Th. 2 through Abd. 2, forming two lateral stripes. Two patches of dark pigment usually present medially on Abd. 4 and may appear to form an incomplete irregular transverse band; Th. 2 entirely white except for black pigment lining anterior and lateral margins; legs range in color from white to light brown to purple near the apex.

Head. Apical bulb of 4th antennal segment usually simple, rarely bilobed. Long differentiated smooth seta on ventral side of 1st antennal segment 3 × as long as short setae. Prelabral setae ciliate. Distal margin of the labral papillae with 2-3 seta or spine-like projections. Labial papilla E with lateral appendage almost straight, reaching tip of papilla. Dorsal head chaetotaxy as in Figure 24A: macrosetae An’ 0, A3a2, A3a3, M3i, S6, Ps3, and Ps5 always absent; Pi1 and Pm1i present or absent; S’ 0 always present. Eyes G and H small and subequal. Eye patch with 5 setae.

Thorax. Thoracic chaetotaxy well-developed (Fig. 24B). Th. 2 with all described macrosetae present, except m4i3. Th. 3 macrosetae a5e3, m4, m5p, and a7 absent (Fig. 24C). Zone Pm with many supplemental macrosetae present in both thoracic segments.

Legs. Trochanteral organ with triangular setal pattern and up to 25 setae. Unguis with 4 inner teeth; basal teeth located approximately middle of inner claw length (Fig. 16B).

Abdomen. Abdominal chaetotaxy abundantly developed. Abd. 1 with 12 macrosetae (Fig. 24D). Abd. 2 macrosetae variable: a2, a3, m3, m3ep, m3e, m3ei, m3ea, and m5 always present; m3ep2 and m3eai sometimes present (Fig. 24E). Abd. 3 macrosetae a2, a3, m3, am6, pm6, and p6 present; a1 always absent (Fig. 24F). Abd. 4 chaetotaxy stable, with 7 inner macrosetae (Fig. 24G). Mucronal teeth subequal.

Remarks.

Entomobrya jubata sp. n. can be easily distinguished by the unique color pattern described above combined with the absence of head macroseta Ps5, the presence of head macroseta S’ 0 and Th. 2 macrosetae m2 and m5 (see Table 2 for additional diagnostic characters). This species is closely related to Entomobrya clitellaria and both share similar chaetotaxy. However, these species can be easily separated by color pattern alone; Entomobrya jubata sp. n. does not have dark pigment on Th. 3 through Abd. 3. The presence of head macrosetae S’ 0 and the absence of head macrosetae Ps5 also separate Entomobrya jubata sp. n. from Entomobrya clitellaria . The color pattern and chaetotaxy exhibited by this species have not been reported in the literature.

Distribution.

Endemic to North America. Entomobrya jubata sp. n. was collected from a single locality in Covington County, Alabama (Suppl. material 2: H).