Tomocerus nabanensis Yu, Yang and Liu 2018
Creators: name: Yu, Daoyuan
name: Zhang, Yating
name: Wang, Ziqiang
name: Hu, Feng
name: Liu, Manqiang
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Collembola
Entomobryomorpha
Tomoceridae
Tomocerus
Tomocerus nabanensis

description: Tomocerus nabanensis
Specimens examined. 17BN1TJ (1–8), vii.2017, leg. Shengjie Liu.
Head: First instar (Fig. 5A). The pattern is identical to that of T. tropicus.
Second instar (Fig. 5B). The chaetal transformation is identical to that of T. tropicus. The neochaetosis is also similar, with the exception that the secondary chaeta An1a appears instead of An1a0 and A2a0.
Third instar (Fig. 5C). Macrochaetae Pm1, Pp1, and Pe2 become mesochaetae. Pp3 becomes distinctly smaller. Secondary chaetae An1p, An3a2, An3i, A2a0, and Pe3i appear.
Fourth instar (Fig. 5D). Pm1, Pp1, Pp3, and Pe2 become microchaetae. Additional micro- and mesochaetae appear only in row An and along the postoccipital collar.
Adult macrochaetotaxy (Fig. 10B). The pattern is very similar to that of T. tropicus, but Pp3 is a microchaeta.
Th. II: First instar (Fig. 6A). The patterns of ordinary chaetae, s-microchaetae, and pseudopores are identical to that of T. tropicus. About 10–13 normal s-chaetae are present.
Second instar (Fig. 6B). Primary chaetae m1, m2, and p3 become macrochaetae; m6 becomes a bothriotrichum; ap5 becomes a mesochaeta; m4, am5, and p1 become microchaetae. Chaetal movement and neochaetosis of macro- and mesochaetae are similar to those of T. tropicus, but a4 is devoid of associated secondary chaetae at this stage. About 10 microchaetae appear in a scattered manner. The number of s-chaetae remains unchanged.
Third instar (Fig. 7A). The changes are very similar to those in T. tropicus, except that about five additional microchaetae appear.
Fourth instar (Fig. 7B). The changes are very similar to those in T. tropicus, including the transformation of a6 into a bothriotrichum.
Adult macrochaetotaxy (Fig. 11B). Collar and aa’ series of macrochaetae are well developed. Chaetae a2–5, m1–3, and p2–4 are macrochaetae; a6 and m6 are bothriotricha.
Th. III, Abd. I, and II: The first instar (Fig. 6A), postembryonic development (Figs 6B, 7), and adult macrochaetotaxy are almost identical to those of T. tropicus, except for minor differences in the transformation and addition of microchaetae.
Abd. III: First instar (Fig. 6A). The pattern is almost identical to that of T. tropicus, with minor difference in some chaetal positions.
Postembryonic development (Figs 6B, 7). The changes are very similar to those in T. tropicus, except that the transformation of p6 and addition of microchaetae occur later.
Adult macrochaetotaxy. The pattern is identical to that of T. tropicus.
Abd. IV: First instar (Fig. 6A). The patterns of ordinary chaetae, bothriotricha, and pseudopores are identical to those of T. tropicus. A total of 21–25 normal and 12–13 long s-chaetae are present. The five most posterior long s-chaetae are the longest (subequal to the length of Abd. V), and are each associated with a mesochaeta in row p (p1–5). The other long s-chaetae are subequal in length.
Postembryonic development (Figs 6B, 7). The changes are very similar to those in T. tropicus, except for minor and apparently random differences in microchaetae and lateral mesochaetae.
Adult macrochaetotaxy. The pattern is identical to that of T. tropicus.
Abd. V: First instar (Fig. 6A). The pattern of ordinary chaetae is almost identical to that of T. tropicus, except that in one case p4 is absent. Six normal s-chaetae are present, with two in front of row a, two between row a and m, one posterior to p6, and one beside el. Occasionally, the s-chaeta posterior to a3 is absent and an extra s-chaeta is present posterior to p6.
Postembryonic development (Figs 6B, 7). The changes are almost identical to those in T. tropicus, except that some mesochaetae become microchaetae in different instars.
Adult macrochaetotaxy. The pattern is identical to that of T. tropicus.
Abd. VI: The chaetotaxy at the first two instars (Fig. 6) is identical to that of T. tropicus.
Status in the later instars and adult is not observed.
S-chaetotaxy from Th. II to Abd. V
Normal s-chaetae: 10–13/6/5/5/5/21–25 * 12–13 (long)/6
S-microchaetae: 1/1/0/0/1/0/0.
description: Published as part of Yu, Daoyuan, Zhang, Yating, Wang, Ziqiang, Hu, Feng & Liu, Manqiang, 2024, Unravelling the obscure homology: postembryonic development of chaetotaxic traits in a basal hexapod taxon (Collembola: Tomoceridae), pp. 1-20 in Zoological Journal of the Linnean Society 202 (3) on pages 9-12, DOI: 10.1093/zoolinnean/zlae020, http://zenodo.org/record/14276780