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Corresponding author: Elton Orlandin ( orlandinelton@gmail.com ) Academic editor: Andreas Zwick
© 2023 Elton Orlandin, Mônica Piovesan, Daniel Herbin, Eduardo Carneiro.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Apatelodidae is a family of Neotropical bombycoids that still needs to be studied in several aspects, as many groups of species have not yet undergone a careful systematic revision. On the other hand, recent studies showed that some species known to be widely distributed in fact form species complexes. Until now, Olceclostera bifenestrata Schaus, 1912, described from Costa Rica, supposedly has a wide distribution, reaching the south of Brazil. We reviewed specimens from South America identified as O. bifenestrata. Using morphological data and DNA barcodes, we discovered that South American specimens belong to four new species: Olceclostera jairana sp. nov., Olceclostera quilombola sp. nov., Olceclostera xeta sp. nov. and Olceclostera wayana sp. nov. The four species can be distinguished mainly by characters of genitalia, mostly in aedeagus structures. However, wing characters (number of hyaline spots) and abdomen characters (number of patches of larger scales) may be useful for classifying species groups in Olceclostera. Additionally, we illustrate and describe for the first time all the life stages of an Olceclostera species, including its chaetotaxy and life history, and provide the first SEM images of the egg of an Apatelodidae species. We present a discussion about the morphological characters of adults and immatures and their relevance to the systematics of Apatelodidae.
American silkworm moth, Olceclostera jairana sp. nov., Olceclostera quilombola sp. nov., Olceclostera wayana sp. nov., Olceclostera xeta sp. nov., systematics, taxonomy
Apatelodidae is a family of Neotropical bombycoids (Lepidoptera: Bombycoidea) that lacks conspicuous colors or economic or medical importance. As a consequence, the group has been largely neglected in biodiversity studies, especially if compared to other large-sized Bombycoidea (e. g. Saturniidae and Sphingidae) (
The genus Olceclostera Butler, 1879, was described in Notodontidae, based on Olceclostera irrorata Butler, 1879 and subsequently transferred to Lasiocampidae as a synonym of Parathyris Hübner 1819 (
The immature stages of Olceclostera species are also poorly known. Only the larvae of two North American species have been described (
Aiming to test if the specimens from South America recognized as O. bifenestrata belong to this species, the morphology of males and females, including genitalia, was studied. To confirm if this morphological similarity reflects a close relationship, we perform a molecular analysis based on COX1 (barcode region, 658pb). Additionally, we describe in detail all immature stages from one of these new species adding a discussion of its relevance to the systematics of Apatelodidae.
About 200 specimens, including all Olceclostera types, were examined directly or indirectly from the following collections (abbreviations used throughout the text):
CDH – Personal collection of Daniel Herbin; Garidech, France.
In addition, we accessed all original descriptions of Olceclostera species (
Immature. The first instar was illustrated with and without the long setae that ornamented the body. These setae were carefully removed using tweezers to allow the visualization of its insertions and other structures present along the body. Images of the eggs were taken using scanning electron microscopy (SEM-JEOL JSM 6360-LV). Images of the egg 1st, and 2nd instars, and pupa were taken using an optical stereomicroscope adapted with focus stacking (Leica Application Suite Version 4.12.0 [Build 86]), and subsequent instars were recorded with a Sony DSC-HX100V digital camera. We used ImageJ Software (
Adults. For the description of adults, the head, palpi, legs, and abdomen were detached, soaked in hot 10% potassium hydroxide solution (KOH) for approximately 3 min, washed in water, examined, illustrated, and then stored in glass vials containing glycerin. Images were taken using an optical stereomicroscope adapted with focus stacking (Leica Application Suite Version 4.12.0 [Build 86]) and a Sony DSCHX100V digital camera. The terminology follows
A female was collected using a reflective sheet placed adjacent to light during sampling at Nova Petrópolis, Joaçaba, Santa Catarina, Southern Brazil (27°06'02″S, 51°36'32″W) on 21–31 December 2019. The female was placed in a plastic container for oviposition. After hatching from the eggs, a set of hostplant species, including Allophylus sp. (Sapindaceae), Duranta erecta L. (Verbenaceae), Handroanthus sp. (Bignoniaceae), Ilex paraguariensis A. St.-Hil. (Aquifoliaceae), Persea americana Mill. (Lauraceae), Psidium cattleyanum Sabine (Myrtaceae) and Schinus terebinthifolia Raddi (Anacardiaceae) were offered to the larvae. These hostplant species were chosen based on previous records of Apatelodidae host plants (
A series of 30 Apatelodidae specimens were selected for DNA sequencing. A leg was removed and sent for sequencing of the COX1 (barcode region, 658pb) at the Canadian Center for DNA Barcoding (CCDB) (
Alignment was then performed with MAFFT (
Genetic distances of the “O. bifenestrata group” were calculated by the Tamura-Nei distance model (
The “Olceclostera bifenestrata group” comprises eight species, namely: Olceclostera angelica (Grote, 1864), Olceclostera bifenestrata, Olceclostera indistincta (Edwards, 1886), Olceclostera jairana sp. nov., Olceclostera quilombola sp. nov., Olceclostera seraphica Dyar, 1906, Olceclostera wayana sp. nov. and Olceclostera xeta sp. nov.
This group of species is easily distinguished from other species of Olceclostera by the following combination of characters: forewings grayish, with sinuous brownish lines, two subapical hyaline spots, and one pair of large patches of broader scales laterally on the abdomen. The South American species are reliably separated from the North American species O. angelica, O. indistincta and O. seraphica by their larger size, less grayish coloring (the North American species are light grey) (see
Pairwise genetic distances (%) for COX1 gene (barcode region, 658pb) sequences among Olceclostera bifenestrata group and the new species of Olceclostera.
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | ||
1 | PLABO847-19 – O. bifenestrata | ||||||||||||||||||||
2 | MIAPD354-10 – O. bifenestrata | 0,000 | |||||||||||||||||||
3 | CNCLB1187-14 – O. angelica | 0,043 | 0,043 | ||||||||||||||||||
4 | CNCLB1186-14 – O. angelica | 0,041 | 0,041 | 0,002 | |||||||||||||||||
5 | HKONS703-08 – O. indistincta | 0,045 | 0,045 | 0,002 | 0,003 | ||||||||||||||||
6 | HKONS704-08 – O. indistincta | 0,045 | 0,045 | 0,002 | 0,003 | 0,000 | |||||||||||||||
7 | HKONB247-09 – O. seraphica | 0,046 | 0,048 | 0,046 | 0,048 | 0,048 | 0,048 | ||||||||||||||
8 | HKONB248-09 – O. seraphica | 0,044 | 0,046 | 0,045 | 0,047 | 0,047 | 0,047 | 0,005 | |||||||||||||
9 | OR094868 – O. jairana sp. nov. | 0,100 | 0,099 | 0,091 | 0,088 | 0,093 | 0,093 | 0,098 | 0,100 | ||||||||||||
10 | OR094867 – O. jairana sp. nov. | 0,100 | 0,099 | 0,091 | 0,088 | 0,093 | 0,093 | 0,098 | 0,100 | 0,000 | |||||||||||
11 | OR094854 – O. jairana sp. nov. | 0,100 | 0,099 | 0,091 | 0,088 | 0,093 | 0,093 | 0,098 | 0,100 | 0,000 | 0,000 | ||||||||||
12 | OR094855 – O. jairana sp. nov. | 0,102 | 0,101 | 0,095 | 0,092 | 0,097 | 0,097 | 0,098 | 0,100 | 0,000 | 0,000 | 0,000 | |||||||||
13 | OR094853 – O. jairana sp. nov. | 0,092 | 0,091 | 0,090 | 0,088 | 0,093 | 0,093 | 0,090 | 0,096 | 0,009 | 0,009 | 0,009 | 0,010 | ||||||||
14 | OR094852 – O. jairana sp. nov. | 0,096 | 0,095 | 0,090 | 0,088 | 0,093 | 0,093 | 0,095 | 0,100 | 0,016 | 0,016 | 0,016 | 0,016 | 0,009 | |||||||
15 | OR094851 – O. jairana sp. nov. | 0,095 | 0,095 | 0,091 | 0,088 | 0,093 | 0,093 | 0,092 | 0,097 | 0,017 | 0,017 | 0,017 | 0,018 | 0,011 | 0,017 | ||||||
16 | OR094850 – O. quilombola sp. nov. | 0,090 | 0,090 | 0,083 | 0,081 | 0,085 | 0,085 | 0,086 | 0,090 | 0,063 | 0,063 | 0,063 | 0,062 | 0,058 | 0,058 | 0,060 | |||||
17 | OR094849 – O. quilombola sp. nov. | 0,090 | 0,089 | 0,087 | 0,085 | 0,089 | 0,089 | 0,090 | 0,094 | 0,067 | 0,067 | 0,067 | 0,066 | 0,062 | 0,058 | 0,063 | 0,003 | ||||
18 | OR094856 – O. xeta sp. nov. | 0,105 | 0,104 | 0,111 | 0,108 | 0,114 | 0,114 | 0,099 | 0,103 | 0,092 | 0,092 | 0,092 | 0,092 | 0,081 | 0,088 | 0,087 | 0,068 | 0,071 | |||
19 | OR094897 – O. xeta sp. nov. | 0,106 | 0,105 | 0,098 | 0,101 | 0,101 | 0,101 | 0,097 | 0,101 | 0,095 | 0,095 | 0,095 | 0,095 | 0,089 | 0,096 | 0,091 | 0,074 | 0,078 | 0,009 | ||
20 | OR094898 – O. xeta sp. nov. | 0,106 | 0,105 | 0,103 | 0,105 | 0,105 | 0,105 | 0,097 | 0,101 | 0,095 | 0,095 | 0,095 | 0,095 | 0,089 | 0,096 | 0,091 | 0,074 | 0,078 | 0,005 | 0,003 | |
21 | OR094899 – O. wayana sp. nov. | 0,116 | 0,115 | 0,115 | 0,118 | 0,118 | 0,118 | 0,107 | 0,110 | 0,102 | 0,102 | 0,102 | 0,102 | 0,096 | 0,099 | 0,098 | 0,079 | 0,080 | 0,035 | 0,038 | 0,034 |
Adult male of Olceclostera species: Olceclostera bifenestrata from Costa Rica. A dorsal view; B ventral view. Olceclostera jairana sp. nov. Holotype male from Parque Estadual do Guartelá, Tibagi, Paraná, Brazil. C dorsal view; D ventral view. Olceclostera quilombola sp. nov. Holotype male from Parque Estadual das Lauráceas, Adrianópolis, Paraná, Brazil. E dorsal view; F ventral view. Olceclostera xeta sp. nov. Holotype male from RPPN Fazenda da Mata, Querência do Norte, Paraná, Brazil. G dorsal view; H ventral view. Olceclostera wayana sp. nov. Holotype male from French Guiana. I dorsal view; J ventral view.
Parque Estadual do Guartelá, Tibagi Municipality, Paraná State, Brazil.
Olceclostera jairana sp. nov. differs from O. quilombola sp. nov. by external and genitalia characters: on the forewing of O. jairana sp. nov., the two subapical hyaline spots between M1 and M3 are rounded, with the one between M2–M3 smaller and almost unnoticeable in some cases. Otherwise, these spots are rectangular and always visible in O. quilombola sp. nov. In the dorsal forewing, posterior to the hyaline spots, O. jairana sp. nov. has a sinuous band of light gray scales, absent in O. quilombola sp. nov. (Fig.
Externally, O. jairana sp. nov. is very similar to O. xeta sp. nov. and O. wayana sp. nov., but O. jairana sp. nov. has all tibias with a band of long scales with light brown apex while O. xeta sp. nov. and O. wayana sp. nov. present these scales with grayish brown apex (Fig.
Head. MALE. Vertex and frons pinkish beige; compound eyes naked; antenna approximately 1/3 the length of the costal margin of the anterior wing, bipectinate from the base to apex, ventrally naked, dorsally covered by pearl scales; labial palpus dorsally covered by brown scales, ventrally covered by a compact block of pinkish beige scales (Fig.
Eggs
(Fig.
First instar
(Fig.
Second instar
(Fig.
Third instar
(Fig.
Fourth instar
(Fig.
Fifth instar
(Fig.
Average duration: 58–60 days (n = 10); length 21–22 mm (n = 2), obtect, stout, heavily sclerotized, all appendages concealed to the body; antennae broad at the base, tapering rapidly to the apex, reaching two thirds the length of the wings; eyes small; proboscis not visible, wings short with truncated apex; margin of segments A1–A6 notched; spiracles narrowly elliptical; without cremaster or anal hooks. The first imagos emerged 60 days after pupation.
After being collected, the female was placed in a plastic container where it oviposited 110 eggs on the container wall. After about 15 days, the larvae hatched from the egg by cutting a small semicircular opening on the dorsal surface of the chorion. The larvae preferred to feed on Handroanthus sp. (Bignoniaceae). During the first and second instars, larvae fed by scraping both the adaxial and abaxial surfaces of the leaf; from the third on, larvae ate the entire leaf.
During the first and second instars, the larvae were very active all day and night, and when threatened, they released themselves from the host plant to the ground by a silk strand. From the third instar on, the larvae were less active during the day, spending this period resting on the branches of the host plant. In the last instar, when threatened, the larvae bristled the dorsal setae of the thoracic segments, making visible the arrangement of the red setae located in this region.
When larvae reached the prepupa, they left the host plant and walked on the soil of the container, burying in it after a few hours to pupate. The underground chamber was not found. After pupating, the earlier imagos emerged in about 60 days, while the latter in about 120 days. There was no difference between the emergence time of females and males. When both emerged on the same night, they immediately mated. An unmated female oviposited about 130 eggs, while a female that had copulated oviposited about 270 eggs.
Based on museum records, the species is present in the Argentina state of Entre Ríos and the Brazilian states of Espírito Santo, Minas Gerais, Paraná, Rio de Janeiro, Santa Catarina, and São Paulo (Fig.
This species is named in honor of the parents of the first author, who always encouraged the first and second authors to persist in their studies; the specific epithet is a combination of their first names, Jair and Ana.
Holotype
. (Fig.
Adult female of Olceclostera species: Olceclostera jairana sp. nov., from Nova Petrópolis, Santa Catarina, Brazil. A dorsal view; B ventral view. Olceclostera quilombola sp. nov., from São Luís do Paraitinga, São Paulo, Brazil. C dorsal view; D ventral view. Olceclostera xeta sp. nov., from Estancia Dimas, Alto Paraná, Paraguay. E dorsal view; F ventral view.
Immature stages of Olceclostera jairana sp. nov. A first instar, dorsal view; B first instar, lateral view; C second instar, dorsal view; D second instar, lateral view; E third instar, dorsal view; F third instar, lateral view; G fourth instar, dorsal view; H fourth instar, lateral view; I fifth instar, dorsal view; J fifth instar, lateral view.
We found at the same locality specimens with one, two, or three spines at the apex of the aedeagus. However, specimens with a different number of spines present a molecular difference of less than 2% (Table
Parque Estadual das Lauráceas, Adrianópolis Municipality, Paraná State, Brazil.
Olceclostera quilombola sp. nov. differs from O. jairana sp. nov. by the following characters: on the forewing of O. quilombola sp. nov. the two subapical hyaline spots between M1 and M3 are rectangular and always visible, while these spots are rounded, with the one between M2–M3 almost unnoticeable in some cases in O. jairana sp. nov. (Figs
Olceclostera quilombola sp. nov. differs from O. xeta sp. nov. and O. wayana sp. nov. by external and genitalia characters: on the forewing of O. quilombola sp. nov., the two subapical hyaline spots, between M1 and M3, are rectangular and always visible, while in O. xeta sp. nov. and O. wayana sp. nov., these spots are rounded and shorter. Olceclostera quilombola sp. nov. has all tibias with a band of long scales with dark brown apex, while O. xeta sp. nov. and O. wayana sp. nov. present these scales with grayish brown apex (Fig.
Head. Male. As in O. jairana sp. nov. Female. Similar to the male, slightly smaller than the male’s head; antenna, pecten shorter than the male’s pecten; palpus, thinner and shorter than the male’s palpus. — Thorax. Male and Female. As in O. jairana sp. nov. — Legs. As in O. jairana sp. nov., but all tibias with a band of long scales with dark brown apex projecting towards the posterior region (Fig.
Based on museum records, the species is present in the Brazilian states of Brasília, Espírito Santo, Minas Gerais, Paraná, Rio de Janeiro, and São Paulo (Fig.
This species is named in honor of the quilombola communities that inhabit the region of the “Parque Estadual das Lauráceas” the type locality of this species.
Holotype
. (Fig.
RPPN Fazenda da Mata, Querência do Norte Municipality, Paraná State, Brazil.
Externally, O. xeta sp. nov. can be distinguished from O. jairana sp. nov. by all tibias with a band of long scales with grayish brown apex, while O. jairana sp. nov. presents these scales with light brown apex (Fig.
Olceclostera xeta sp. nov. differs from O. quilombola sp. nov. by external and genitalia characters: on the forewing of O. xeta sp. nov. the two subapical hyaline spots, between M1 and M3, are rounded and smaller. Otherwise, these spots are rectangular in O. quilombola sp. nov. Dorsally, the abdomen of O. xeta sp. nov. has a grayish color, while O. quilombola sp. nov. has a copper color (Fig.
Olceclostera xeta sp. nov. is similar to O. wayana sp. nov., but slightly darker gray and smaller in size (17 mm forewing length). The subapical hyaline spots are slightly larger. In the genitalia, O. xeta sp. nov. differs from O. wayana sp. nov. by the presence of a protrusion on the apex of the aedeagus.
Head. Male. As in O. jairana sp. nov. Female. Antenna, pecten shorter than the male’s pecten. — Thorax. Male and Female. As in O. jairana sp. nov. — Legs. All tibias with a band of long scales with grayish-brown apex projecting towards the posterior region (Fig.
Based on museum records, the species is present in the Brazilian states of Paraná and the Paraguayan provinces of Alto Paraná, Canindeyú, Concepción, Cordillera, Hayes, and Paraguarí (Fig.
This species is named after the Xetá indigenous people. The Xetá were original inhabitants of the northwestern Paraná and the last ethnic group in the state to come into contact with white colonizers (in 1954) who invaded their territory and decimated the Xetá population.
Holotype
. (Fig.
Piste Patagai-Counamama, French Guiana.
Externally, O. wayana sp. nov. is similar to O. xeta sp. nov., slightly lighter grey and larger (21 mm forewing length). The two subapical hyaline spots between M1 and M3 are tiny. In the genitalia, O. wayana sp. nov. differs from O. xeta sp. nov. by the absence of a protrusion on the apex of the aedeagus and vesica with a plate with minute teeth.
Head. Male. As in O. xeta sp. nov. Female. Unknown. — Thorax.—As in O. xeta sp. nov. — Legs. As in O. xeta sp. nov. — Wings shape and venation. As in O. jairana sp. nov. (Fig.
French Guiana.
This species is named after the Wayana indigenous people, inhabiting along the Maroni River, at the border between French Guiana and Suriname.
Holotype
. (Fig.
Based on sequences of the mitochondrial COX1 gene (barcode region, 658pb), our reconstructed tree recovers O. jairana sp. nov. and O. quilombola sp. nov. as a sister group to O. xeta sp. nov. and O. wayana sp. nov., although this relationship is not well supported. This clade is sister to a cluster that includes the Central American O. bifenestrata and the North American O. angelica, O. indistincta, and O. seraphica (Fig.
Maximum likelihood phylogenetic tree, inferred with IQ-TREE, based on cytochrome c oxidase subunit I (COX1, barcode region, 658pb) showing the relationship among new species of Olceclostera, twenty other species of Olceclostera, and representatives of ten genera of Apatelodidae as outgroups. Numbers indicate ML ≥ 70, and * indicates maximum support of 100. Low support values were not shown. The scale bar represents the expected number of nucleotide substitutions per site.
Olceclostera jairana sp. nov., O. quilombola sp. nov., O. xeta sp. nov. and O. wayana sp.nov. are morphologically similar to the North American species O. angelica, O. indistincta, and O. seraphica (see
The configuration of the hyaline spots and the number of patches of broader scales laterally on the abdomen can be used to distinguish groups of species of Olceclostera. For example, some species have only a yellowish hyaline spot on their forewings and one pair of large patches of broader scales laterally on each abdominal segment (e. g. Olceclostera guanduna Drautd, 1929, Olceclostera indentata Schaus, 1910, O. irrorata, Olceclostera leticiensis Herbin, 2021, Olceclostera microps (Walker, 1855) and Olceclostera reperta (Walker, 1865)), while others have only a whitish hyaline spot on their forewings and two pairs of large patches of broader scales laterally on the proximal abdominal segments (e. g. Olceclostera amoria Druce, 1890, Olceclostera azteca Schaus, 1894, Olceclostera magniplaga Schaus, 1910 and Olceclostera porioni Herbin and Mielke, 2018). Although the patches of larger scales on the abdomen call us attention, these patches are mentioned in the descriptions of only seven species (O. angelica, O. irrorata, O. azteca, O. magniplaga, O. reperta, O. indentata, O. microps). However, these spots are not present in all the species of the genus. Therefore the phylogenetic significance of this character requires further studies.
Knowledge about immature traits is essential to understanding the Lepidoptera evolution (
The chaetotaxy of O. jairana sp. nov. is very similar to the chaetotaxy of other Apatelodidae species, which were described in detail (
The available information on the immature stages of Olceclostera allows us to make some comparisons between the species of the genus. In the last larval instars, O. jairana sp. nov. is very similar to O. bifenestrata and O. seraphica, differing from them by the more brownish color, by the dorsal region of the body with smaller yellow spots (larger in O. bifenestrata) and by the absence of orange spots on the dorsal region of the body (present in O. seraphica) (
Olceclostera jairana sp. nov. pupates in the soil like other known Apatelodidae species. This trait appears to be shared by most species in the family, as, so far, only Prothysana is known to make cocoons (
Apatelodidae, like most moth groups, has been neglected in worldwide collections, although they belong to one of the most collectible moth groups in the world, the Bombycoidea (e. g. Saturniidae, Sphingidae, Brahmaeidae). As for these groups, detailed investigation on male genitalia showed that some old recognized wide-spread species comprise a set of cryptic species whose geographic distribution is much more restricted than previously thought. This is the case of South American specimens formerly identified as O. bifenestrata, that currently are the type series of O. jairana sp. nov., O. quilombola sp. nov., O. xeta sp. nov., and O. wayana sp. nov., whose differences in genitalia morphology are corroborated by great genetic distances in COX1 (barcode region, 658pb) sequences. The accumulated knowledge, especially in recent years, shows that there is still much to be studied to understand the evolutionary relationships between Apatelodidae lineages.
The authors have declared that no competing interests exist.
We are grateful to Dr Mirna Martins Casagrande, from Laboratório de Estudos de Lepidoptera Neotropical (UFPR), for making available the stereomicroscope used to illustrate the specimens. To Dr Sharon de Toledo Martins from the Center of Electronic Microscopy (CME) of the Universidade Federal do Paraná (UFPR) for the SEM images. To Dr Vitor Osmar Becker (VOB) and Dr Diego Dolibaina (DD) for loan specimens of Apatelodidae. To Dr Thamara Zacca (
Table S1
Data type: .xlsx
Explanation note: GenBank and BOLD Systems accession numbers of Olceclostera specimens used in the Maximum likelihood phylogenetic tree, based on cytochrome c oxidase subunit 1 (COX1) (DNA barcode).