Zootaxa

**Comparative phylogeographic patterns in three pan-Amazonian antwren lineages (Aves: Passeriformes: Thamnophilidae: Myrmotherula and Isleria)**

R. TERRY CHESSER — 2025-11-18

We examined DNA sequences of 328 individuals of three lineages (species or species complexes) of Amazonian antwrens to evaluate their degree of geographical and historical concordance. All lineages (Myrmotherula longipennis, M. menetriesii, and the Isleria guttata-hauxwelli species complex) consist of small insectivorous birds that occupy understory or midstory of terra firme forest and are widely distributed across the Amazon Basin. Individuals of each of the three lineages grouped into genetic clades mainly separated by the Amazon and some major tributaries, although members of different clades of both M. menetriesii and I. hauxwelli were documented in the Madeira-Tapajós interfluvium. Branching patterns differed among taxa, but all taxa were highly differentiated across the lower or upper Amazon. Despite the morphological, ecological, and phylogenetic similarities among lineages, and despite the fact that nearly all taxa are bounded by rivers, the effect of the other major rivers as biogeographic barriers was highly variable. The Marañón, Ucayali, Madeira, Tapajós, Xingu, Napo, Negro, and Branco all separated main clades in one or two lineages but not in the others. Levels of genetic differentiation along the Teles Pires were substantially higher than those across the Tapajós in M. menetriesii and I. hauxwelli, consistent with a proposed historical change of river course for the Tapajós. Genetic units in this study were comparable for the most part to taxonomic units delineated by analyses of vocal and morphological variation, and identical, with one exception, to units defined solely by vocal variation in a companion paper (Isler et al. 2025). These results, in conjunction with those of Isler et al. (2025), provide additional instances of the variability of responses to the historical dynamism of Amazonia, in this case in closely related and ecologically similar species; highlight the consistency of genetic differentiation with vocal differentiation in additional species of Neotropical suboscine birds; support the importance of Amazonian rivers in creating conditions that result in the differentiation of independent evolutionary lineages; and demonstrate that species richness in two of the lineages studied (M. longipennis and M. menetriesii) was previously underestimated.

**Systematics of three pan-Amazonian antwren lineages (Aves: Passeriformes: Thamnophilidae: Myrmotherula and Isleria)**

MORTON L. ISLER — 2025-11-18

Working within the framework of a companion phylogenetic analysis, we reexamined species limits within three lineages of antwrens (two species and one species complex) widely distributed across the Amazon Basin. Diagnostic differences in vocal and plumage characters provided the basis for the following taxonomic revisions. Myrmotherula longipennis is found to comprise three species: (1) M. longipennis (sensu stricto), which is confined to the region north of the Amazon; (2) M. garbei, which is elevated from subspecies status and includes the subspecies zimmeri; and (3) M. paraensis, which is also elevated from subspecies status and includes subspecies transitiva and ochrogyna. Myrmotherula menetriesii also comprises three species: (1) M. menetriesii (sensu stricto), which occurs in the southwest quadrant of Amazonia and includes the subspecies berlepschi; (2) M. cinereiventris, which is elevated from subspecies status and includes the subspecies pallida; and (3) M. omissa, which is monotypic and is also elevated from subspecies status. We maintain two species in the Isleria complex, I. guttata and I. hauxwelli. Isleria guttata remains monotypic, but the subspecies of I. hauxwelli are revised. Isleria h. hellmayri is preserved as currently defined, but I. h. suffusa is synonymized with the nominate form, the geographic range of which is restricted to western Amazonia. A fourth subspecies, I. h. clarior, is resurrected; this subspecies occupies the major part of the range previously assigned to I. h. hauxwelli.

**A new species of Psephenops Grouvelle, 1898, with new distribution data and habitat notes of the psephenine water-penny beetles from Mexico (Coleoptera: Psephenidae: Psepheninae)**

ERICK A. CHACÓN-HARTLEVEN — 2025-11-18

A new species of Psephenops is described based on specimens from Chiapas, Mexico. The new species may be separated from known Psephenops species by a combination of traits, mainly by uniformly widened parameres in dorsal view, elongated, with apex rounded, with internal margins fused at the base. First records of Belicinus rhomboideus Arce-Pérez & Shepard, 2012 and Psephenops shepardi Arce-Pérez, 2013 in Mexico are presented, while new state records of Psephenus palpalis Champion, 1913 and Psephenopalpus browni Arce-Pérez, 2004 within the country are also presented, with notes on habitat for each species; males of the latter three species are reported as collected entirely submerged utilizing a Surber sampler. An identification key for species of Psephenops of the New World is included. The number of valid species of Psephenops now totals 16, with three species occurring in Mexico. The number of species of psephenins (Psephenidae: Psepheninae) known from Mexico increases from 10 to 13.

**A review of the genus Epiphanops Reitter, 1895 (Coleoptera: Curculionidae: Entiminae)**

GENRIK E. DAVIDIAN — 2025-11-18

A review of the Palaearctic genus Epiphanops Reitter, 1895 (Coleoptera: Curculionidae: Entiminae) is presented. Epiphanops dohrni (Faust, 1886) is resurrected from synonymy with E. persicus (Chevrolat, 1879). A new subspecies E. dohrni margaritae Davidian & Gültekin L. ssp. nov. is described from the Arax River basin in Azerbaijan and Turkey. The male of E. talamellii Białooki, 2008 is described herein for the first time. Morphological taxonomic characters are digitally illustrated, a key to the species and new distributional data are presented.

**Morphogenesis of small springtails species from the genus Megalothorax (Collembola: Neelidae)**

KSENIA PANINA — 2025-11-18

In this work, we describe for the first time the complete sequence of chaetotaxy development for Megalothorax bokovae and the second stage chaetotaxy for Megalothorax perspicillum. The chaetotaxy development of the body is similar in these two species: at the juvenile stages, the chaetotaxy of the first segment of the thorax and the last segments of the abdomen is more developed, while the chaetotaxy of the two last segments of the thorax and the first segments of the abdomen is not developed. In addition to the increase in the number of chaetae, during the process of Megalothorax morphogenesis, the size and shape of the sensillar apparatus changes. All this suggests that the genus Megalothorax is characterized by such evolutionary strategies as neochaetosis and heterochaetosis. This study will promote the future use of chaetotaxic traits in the taxonomic and phylogenetic studies of Megalothorax, and will potentially illuminate the early evolution of Neelipleona.

**New fossil genus and species from the subfamily Sigalphinae (Hymenoptera: Braconidae) in Eocene Baltic amber with remarks on the genus Acampsohelcon Tobias, 1987**

SERGEY A. BELOKOBYLSKIJ — 2025-11-18

The new peculiar genus and species, Balticampsis Belokobylskij, gen. nov. and B. inopinatus Belokobylskij, sp. nov., from the tribe Sigalphini (Acampsina) of the subfamily Sigalphinae are described and illustrated from late Eocene Baltic amber. This is the first reliable record of a fossil member of the Sigalphinae. A discussion about the taxonomic position of the genus Acampsohelcon Tobias, 1987 is provided: it was initially included in the subfamily Sigalphinae as the tribe Acampsohelconini. The other genera of the former Acampsohelconinae are separated in the subfamily Afrocampsinae status nov. with the tribes Afrocampsini (with Afrocampsis van Achterberg & Quicke) and Urosigalphini (with Canalicephalus Gibson and Urosigalphus Ashmead).

First record of the family Eriopisidae (Crustacea, Malacostraca, Amphipoda) from Southern Sea, Korea with description of one new species

JAE HONG CHOI — 2025-11-18

This study aims to discover and document amphipods from Korea, contributing to the clarification of the taxonomy of Korean amphipod species. As part of this effort, a new species belonging to the family Eriopisidae Lowry & Myers, 2013 was collected from sublittoral waters of the Southern Sea, Korea. This study reports the first record of this family from Korean waters. Monotypic genus Cephalopisella G. Karaman, 1984 consists of the species Cephalopisella propagatio (Imbach, 1967), which has been previously documented in the Northern Yellow Sea and Southeast Asian waters. The new species, Cephalopisella namhaensis sp. nov., is morphologically similar to C. propagatio in having a notch on the anteroventral corner of the cephalic lobe and in lacking sexual dimorphism in gnathopod 2. However, the new species can be distinguished by a relatively short cephalic lobe, the presence of simple setae on article 3 of mandibular palp, and a posteroventrally produced epimeron 3. This study provides a detailed description and illustration of Cephalopisella namhaensis sp. nov., expanding the known distribution and diversity of the family Eriopisidae.

**Catalog of the genus Schmidtiana Podaný 1971 (Coleoptera: Cerambycinae) in the Philippines with notes on species variation and key to the species**

MILTON NORMAN MEDINA — 2025-11-18

This paper presents a catalog of Philippine species of the genus Schmidtiana Podaný, 1971, with updated distributional records from the Eastern Mindanao Biodiversity Corridor. It also provides information on species-level variation, high-definition images of type materials and reference collections, and an identification key to the Philippine species of Schmidtiana. A neotype of S. palawana (Schultze, 1922) is also designated and deposited in the Philippine National Museum.