Research Article |
Corresponding author: Jana Christophoryová ( christophoryova@gmail.com ) Academic editor: Facundo Martín Labarque
© 2020 Jana Christophoryová, Katarína Krajčovičová.
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.
Citation:
Christophoryová J, Krajčovičová K (2020) The first species of the pseudoscorpion genus Lechytia Balzan, 1892 (Pseudoscorpiones, Chthoniidae) from New Zealand. ZooKeys 1000: 19-29. https://doi.org/10.3897/zookeys.1000.56313
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The subfamily Lechytiinae is reported from New Zealand for the first time. A new species, Lechytia novaezealandiae sp. nov., is described and illustrated from Lake Waikare in Waikato District, North Island. In addition, a key to species in the genus Lechytia from Asia, Australia, and New Zealand is included.
description, Lechytia novaezealandiae, Pacific Ocean, taxonomy
Lechytiines were first recognised as a tribe of the Chthoniidae by
Lechytiines occur in most regions of the world but particularly in tropical and subtropical zones. Most of them have restricted distributions, being only known from a few locations (
Lechytiines are often corticolous, living under or between the bark of trees and in tree hollows (e.g.
We have received two Lechytia specimens and discovered that they represent the first record of the subfamily Lechytiinae in New Zealand. The new discovery led us to provide a description of the new species, here called Lechytia novaezealandiae.
Both specimens of Lechytia novaezealandiae sp. nov. examined for this study had been preserved in 75% ethanol. They were studied as temporary slide mounts, prepared by immersing of the specimens in lactic acid for clearing. After the study, they were rinsed in water and returned to 75% ethanol, with the dissected portions being placed in microvials.
Morphological and morphometric analyses were performed using a Leica DM1000 compound microscope with an ICC50 Camera Module (LAS EZ application, 1.8.0). Measurements were taken from digital images (photographed using a Leica DM2500 compound microscope with a Canon EOS 70D camera) using the AxioVision 40LE application. Reference points for measurements follow
The terminology follows
The types of the new species are deposited in the zoological collection of the Museum of New Zealand Te Papa Tongarewa, New Zealand.
Family Chthoniidae Daday, 1889
Subfamily Lechytiinae Chamberlin, 1929
Roncus chthoniiformis Balzan, 1887, by original designation.
For the members of Lechytiinae, the most peculiar diagnostic feature is the arrangement of the trichobothria eb and esb on the chelal hand dorsum (in all other chthoniids, these trichobothria are situated at the base of the fixed chelal finger) (
Holotype : New Zealand • ♂; North Island, Waikato District, near Lake Waikare [-37.456, 175.189]; 5 m a.s.l.; 25 Jul. 1980; Galina Fedorovna Kurcheva leg.; moss; AF.000964. Paratype: • ♀; same data as holotype; AF.000965.
The new species belongs to the “arborea” group and is characterised by the following combination of characteristics: trichobothria b and sb situated less than 1 areolar diameter apart; palpal chela 3.17–3.30× and palpal hand 1.58–1.60× longer than broad; palpal femur 0.21–0.24 mm, palpal hand 0.16–0.19 mm and chelal moveable finger 0.19–0.22 mm long.
Adults (Figs
Lechytia novaezealandiae sp. nov., adults, dorsal A carapace (female) B right chelicera (male) C coxae (male) D right chela, showing trichobothrial pattern (male) E detail of structure on palpal hand F chaetotaxy of genital area (sternites II–III) (male) G Right leg I (female). Abbreviations: moveable chelal finger: t–terminal, b–basal, sb–subbasal, st–subterminal; fixed chelal finger: dx–duplex trichobothria, et–exterior terminal, it–interior terminal, est–exterior subterminal, ist–interior subterminal, esb–exterior subbasal, eb–exterior basal, isb–interior subbasal, ib–interior basal. Scale bars: 0.1 mm.
(length/width or, in the case of the legs, length/depth) in mm. Body length 0.78 (♂), 0.97 (♀). Pedipalp: trochanter 0.11/0.07 (♂), 0.12/0.07 (♀); femur 0.21/0.07 (♂), 0.24/0.08 (♀); patella 0.12/0.07 (♂), 0.15/0.09 (♀); chela 0.33/0.10 (♂), 0.38/0.12 (♀); hand 0.16/0.10 (♂), 0.19/0.12 (♀); moveable finger 0.19 (♂), 0.22 (♀). Chelicera 0.15/0.10 (♂), 0.20/0.12 (♀); moveable finger 0.09 (♂), 0.10 (♀). Carapace 0.28/0.26 (♂), 0.30/0.32 (♀). Leg I: trochanter 0.07/0.05 (♂, ♀); femur 0.11/0.03 (♂), 0.13/0.04 (♀); patella 0.06/0.04 (♂), 0.07/0.04 (♀); tibia 0.06/0.03 (♂), 0.07/0.03 (♀); tarsus 0.11/0.02 (♂), 0.14/0.03 (♀). Leg IV: trochanter 0.07/0.06 (♂), 0.08/0.07 (♀); femoropatella 0.21/0.11 (♂), 0.23/0.13 (♀); tibia 0.13/0.05 (♂), 0.15/0.05 (♀); metatarsus 0.08/0.04 (♂, ♀); tarsus 0.11/0.02 (♂), 0.13/0.03 (♀).
The specific epithet refers to the island country of New Zealand, on which this species occurs.
Lechytia novaezealandiae sp. nov. Is at present known only from the type locality near Lake Waikare, Waikato District, North Island, New Zealand at an altitude of 5 m. The specimens were collected in moss in July.
Lechytia species have rarely been studied in recent years, and little is known about the relationships between the named species (
The “hoffi” group is presently known to include only two species – Lechytia hoffi Muchmore, 1975 from the United States and L. yulongensis Zhang & Zhang, 2014 from China (
Lechytia novaezealandiae sp. nov. also belongs to the “arborea” group and differs from all above-mentioned species from the “arborea” group by its smaller palpal dimensions (e.g. L. arborea femur 0.31–0.32, chela 0.50–0.52, moveable finger 0.27–0.28 mm; L. sini femur 0.25–0.30, chela 0.38–0.47, moveable finger 0.23–0.27 mm; L. chthoniiformis femur 0.30–0.32, chela 0.46, moveable finger 0.25–0.27 mm; L. sakagamii femur 0.27–0.30, chela 0.41–0.45, moveable finger 0.24–0.26 mm; L. libita femur 0.27–0.32, chela 0.40–0.46, moveable finger 0.24–0.28 mm; but L. novaezealandiae sp. nov. femur 0.21–0.24, chela 0.33–0.38, moveable finger 0.19–0.22 mm) (
The new species differs from L. indica Murthy & Ananthakrishnan, 1977, L. madrasica Sivaraman, 1980 (both from India), and from L. cavicola Muchmore, 1973 (Mexico) by the presence of eyes on the carapace and smaller palpal femur and chela (
From known African species, L. novaezealandiae sp. nov. differs by smaller palpal hand and finger, as well as by the position of trichobothria sb and b on moveable chelal finger (in L. leleupi Beier, 1959, L. dentata Mahnert, 1978, and L. natalensis (Tullgren, 1907) trichobothria sb and b are situated close together; in L. serrulata Beier, 1955 and L. maxima Beier, 1955, trichobothria sb and b are situated more than one areolar diameter apart) (
The situation is similar for other known species from the Americas, Asia, and Turkey; L. novaezealandiae sp. nov. differs by smaller palpal segments (L. delamarei Vitali-di Castri, 1984 femur 0.32, finger 0.28 mm; L. chilensis Beier, 1964 hand 0.24, finger 0.33 mm; L. trinitatis Beier, 1970 femur 0.30, hand 0.23–0.24, finger 0.25–0.26 mm; L. martiniquensis Vitali-di Castri, 1984 femur 0.32, finger 0.29 mm; L. kuscheli Beier, 1957 hand 0.25–0.29, finger 0.33–0.39 mm; L. himalayana Beier, 1974 femur 0.50, hand 0.27, finger 0.34 mm; L. asiatica Redikorzev, 1938 femur 0.30, hand 0.20 mm; L. anatolica Beier, 1965 hand 0.24, finger 0.28 mm) (
1 | Eyes or eyes spots absent | 2 |
– | Eyes or eyes spots present | 3 |
2 | Pedipalps slender; palpal femur 3.05–3.10 times longer than broad; palpal chela 4.20–4.30 times longer than broad | L. madrasica |
– | Pedipalps robust; palpal femur 2.20–2.30 times longer than broad; palpal chela 3.80–3.90 times longer than broad | L. indica |
3 | Trichobothria b and sb on moveable chelal finger situated less than 1 areolar diameter or even less apart | 4 |
– | Trichobothria b and sb on moveable chelal finger situated 1 or more than 1 areolar diameter apart | 6 |
4 | Palpal femur shorter, 0.21–0.24 mm long | L. novaezealandiae sp. nov. |
– | Palpal femur longer, 0.27–0.30 mm long | 5 |
5 | Trichobothria b and sb on moveable chelal finger situated about half an areolar diameter apart; moveable chelal finger 0.24–0.26 mm long | L. sakagamii |
– | Trichobothria b and sb on moveable chelal finger contiguous; moveable chelal finger 0.22 mm long | L. asiatica |
6 | Trichobothria b and sb on moveable chelal finger situated 2 areolas diameter apart | L. himalayana |
– | Trichobothria b and sb on moveable chelal finger situated 1 areolar diameter apart | 7 |
7 | Distal seta on palpal coxa bifurcate; chelal teeth strongly reduced; tergite XI with chaetotaxy 1T2T1; male galea reduced (representative of “arborea” species-group) | L. libita |
– | Distal seta on palpal coxa simple; chelal teeth well-developed; tergite XI with chaetotaxy T2T; male galea nearly as well developed as in female (representative of “hoffi” species-group) | L. yulongensis |
Special thanks to Galina Fedorovna Kurcheva, who collected the pseudoscorpions, and to Aleksandr Vladimirovich Matyukhin, who accredited us and sent the old, deposited material for identification. We are very thankful to our friend Erika Igondová for technical assistance with the map and to the reviewers, Mark Stephen Harvey and Catalina Romero-Ortiz, for valuable and constructive comments which improved the quality of the paper. The research was financially supported by VEGA grant 1/0704/20 and by the Slovak Research and Development Agency under the contract no. APVV-19-0076.
Jana Christophoryová would like to dedicate this article to my late mother who always supported me so vigorously in all my achievements. I wish she could have shared this one with me.