Pogonognathellus heterochros Wang & Yu & Zhang 2013, sp. nov.
Creators: name: Wang, Tianle
name: Yu, Daoyuan
name: Zhang, Feng
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Collembola
Entomobryomorpha
Tomoceridae
Pogonognathellus
Pogonognathellus heterochros

description: Pogonognathellus heterochros sp. nov.
(Figures 1A, 2–4)
Description
Body length. Up to 6.9 mm.
Body colour. Scales brown. Ground colour white. Ant. III, head, Th. II, base of front and mid legs dark purple. Pigment on Ant. III darker at the base and gradually lighter towards tip. Eye patches black. Unpigmented spots on Th. II forming an irregular but relatively stable pattern. Anterior part of Th. III and femora of hind legs with diffuse purple pigment (Figure 1A).
Head. Antennae about 0.75 times body length, antennal length ratio as I: II: III + IV = 1.0: 1.4: 7.1–10.0, Ant. I, II and base of Ant. III scaled. Ommatidia 6 + 6. Labral setae four / five, five, four, all smooth, four setae of the third row thicker than others, labral margin with four spiny papillae, medial two curved and thinner, lateral two straight and stronger (Figure 2A). Left and right mandible respectively with four and five apical teeth, a strong tapered tooth present distally on left molar plate and a hollow present in place on opposite side (Figure 2B). Maxillary lamella 5 with long basal teeth, no distinct beard-like appendix observed (Figure 2C). Papilla of maxillary outer lobe with four setae, one basal, one apical and two median, the apical one much stronger; sublobal plate with four guard setae (Figure 2D). Labial palp A–E (Fjellberg 1998) with zero, five, zero, four, seven guard setae, hypostomal setae H rod-like, h 1 thicker and longer than h 2 (Figure 2E). Proximal, basomedian and basolateral area of labium each with about 40 setae.
Dorsal chaetotaxy. Macrochaetotaxy as in Figures 2F and 3A. Dorsal head with two, four anterior and two posterior macrochaetae; 4 + 4 posterior marginal setae arranged in a loose row (Figure 2F). Macrochaetae on each tergum with one to six guard microchaetae and bothriotricha without those accessory setae around it. Abd. IV without anterior macrochaeta (Figure 3A).
Legs. Trochanteral organ reduced to one, one slender spiny seta; some shorter smooth spiny setae present over a distance around trochanteral organ, sockets of them rounded and big as those of setae on trochanteral organ (Figure 3B). Tibiotarsus with zero, zero, two blunt spiny inner setae (Figure 3C). Tenent hair apically spatulate, much shorter than inner side of unguis. Unguis relatively straight, curved only at tips, with four, four, four inner teeth and a pair of pseudonychia. Unguiculus about two-thirds the length of unguis and with one inner tooth (Figure 4A).
Abdominal appendages. Ventral tube covered by scales and setae both anteriorly and posteriorly; each side of anterior face with about 40 setae in different sizes, three of which larger than others. Tenaculum with 4 + 4 teeth, corpus unscaled and with one seta shorter than rami (Figure 4B). Furcula ratio as 4.3–5.0: 5.3–6.6: 1.0 from manubrium to mucro. Manubrium with lateral row of 11–13 large blunt setae, both dorsal and ventral face scaled and no distinct “principal setae” appearing on dorsal face. Inner bases of dentes bearing a pair of large pointed scales with a few striate sculptures on surface. Dental spine formula as II / 7–10, II. Spines all simple, with irregular longitudinal streaks, basal pair on medial dental parts distinctly smaller than others (Figure 4C). Mucro elongate, basal two teeth close to each other, distance from base of mucro to inner basal tooth about 1 / 12 length of mucro, apical and subapical teeth subequal, dorsal lamella with 6–11 intermittent teeth. Apical mucronal setae much larger than others (Figure 4D).
Types
Female holotype and two female paratypes on slides and five in alcohol in NJU. Location: Erdaobaihe Town, Antu County, Yanbian Korean Autonomous Prefecture, Jilin Province, China. In forest litter. Collected by CHEN Jianxiu, MA Yitong and YU Daoyuan.
Etymology
Named for its unique cuticular colour. Greek word hetero for different, chros for pigmentation.
Remarks
Pogonognathellus heterochros sp. nov. is similar to P. flavescens in details, such as unguis, dental spines and mucro, but it lacks the long beard-like appendix at the base of maxillary lamella 5, which is a significant character in P. flavescens (Yosii 1967; Fjellberg; 2007; Felderhoff et al. 2010). This new species can be easily recognized by the unique body colour in alcohol.
description: Published as part of Wang, Tianle, Yu, Daoyuan & Zhang, Feng, 2013, Two new species of Pogonognathellus (Collembola: Tomoceridae) from China, with a discussion of East Asian species, pp. 1243-1255 in Journal of Natural History (J. Nat. Hist.) (J. Nat. Hist.) 47 (17 - 18) on pages 1244-1249, DOI: 10.1080/00222933.2012.752541, http://zenodo.org/record/4631135