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Ceratophysella species from mushrooms in China (Collembola, Hypogastruridae)
expand article infoWanda Maria Weiner, Zhijing Xie§|, Yu Li, Xin Sun|#
‡ Institute of Systematics and Evolution of Animals, Polish Academy of Sciences, Kraków, Poland
§ University of Chinese Academy of Sciences, Beijing, China
| Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China
¶ Jilin Agricultural University, Changchun, China
# University of Göttingen, Göttingen, Germany
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Abstract

Four species of the genus Ceratophysella living on mushrooms are reported from China, including a new species, Ceratophysella skarzynskii Weiner & Sun, sp. n., which is described from alpine mushrooms. The new species belongs to the Ceratophysella group of species with a dorsal chaetotaxy of type B and differs from the other species in a combination of characters. Ceratophysella skarzynskii sp. n. is distinguished by its small body size (maximum length 1.09 mm), number of peg-like s-chaetae (30–32) in the ventral sensory file, the trilobed apical vesicle of antennal segment IV, five modified chaetae on dens, and serrated dorsal chaetae. A key to the Chinese species of the genus has been provided.

Keywords

Ceratophysella skarzynskii sp. n., key, new species, taxonomy

Introduction

The genus Ceratophysella Börner, 1932 is distributed worldwide, having more than 130 species (Bellinger et al. 1996–2018). The main diagnostic characters for the genus are the pigmented body, 8 + 8 ocelli, body chaetae mostly differentiated into micro- and macrochaetae, an eversible integumental sac usually present between antennal segments III and IV, the ventral side of antennal segment IV with a sensory file often well-developed of short, erect, curved, and flattened at tips s-chaetae, unguiculus with broad basal lamella, furca well developed, mucro usually boat-like with a spoon-like apex and distinct lamella, and anal spines usually long and curved.

Until now, fourteen species of the genus Ceratophysella have been reported from China (Zhao 1992, Shen 1993, Liu et al. 1998, Zhao et al. 1997, Jia et al. 2010). As a common group of Collembola living on mushrooms, species have often caused significant economic damage in China (Wei 2002; Zhu 2012). Within a large collection of the mushroom Collembola in China, three known species, C. communis (Folsom, 1898), C. denticulata (Bagnall, 1941), C. liguladorsi (Lee, 1974), and the new species described here, C. skarzynskii sp. n., are reported in the present paper.

Materials and methods

Specimens were collected by hand using a brush and stored in ethanol; they were then cleared in lactic acid and KOH, and mounted in Marc André II medium. Drawings and measurements were made using a phase contrast microscope LEICA DM2500 equipped with a camera lucida.

Mushroom species were determined by the third author, Yu Li.

Abbreviations used in the descriptions:

Abd. abdominal segments,

Ant. antennal segments,

av apical vesicle

AIIIO sensory organ of Ant. III,

l.p. lateral processus on labial palp,

ms s-microsetae (ms) (microsensillum),

or subapical organite

PAO postantennal organ,

S sensillum,

s-chaetae sensorial chaetae on Th. and Abd.

Th. thoracic segments,

VT ventral tube,

IGA-CAS Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences;

ISEA-PAS Institute of Systematics and Evolution of Animals, Polish Academy of Sciences.

Terminology for the descriptions follows that given in Fjellberg (1984, 1999), Babenko et al. (1994), and Thibaud et al. (2004).

Taxonomy

Ceratophysella skarzynskii Weiner & Sun, sp. n.

Figs 1, 2, 3, Table 1

Type material

Holotype : preadult male, China: Jilin: Changbai Mountains, alt. 2000 m, on Russula sp., leg. Xin Sun, 29 July 2015. Paratypes: 10 females and one juvenile, the same data as holotype. Type material: the holotype and 8 paratypes are housed in IGA-CAS, China, two paratypes in ISEA-PAS, Poland.

Diagnosis

Dorsal chaetotaxy of type B with serrated chaetae. Maximal length 1.09 mm. Antennal segment IV with bi- or trilobed apical vesicle and ventral sensory file with 30–32 peg-like s-chaetae. Dens with seven chaetae, five of them modified.

Description

Body length 0.9–1.09 mm (holotype: 1.07 mm). Body colour violet or blue in alive specimens, grey or grey-black in alcohol, ventrally pale. Granulation rather coarse, 10–14 granules between chaetae p1 on Abd. V (Yosii’s parameter).

Antennae. Ant. IV with bilobed or trilobed apical vesicle (av), subapical organite (or), dorso-lateral microsensillum (ms), seven cylindrical, subequal sensilla (dorsal S0, S1–4, dorsolateral S7–8), ca. 30 small, peg-like sensilla and one subcylindrical sensillum in ventral sensory file (sensory rasp) (Fig. 2A, B). Ant. III-organ with two long (external) and two short (internal) curved sensilla (Fig. 2A). Microsensillum on ant. III present. Eversible sac between Ant. III–IV present (Fig. 2B). Ant. I with seven chaetae, Ant. II with 13 chaetae.

Head. Ocelli 8 + 8. Postantennal organ 1.5 times as large as single ocellus with four lobes of which the anterior pair is larger than the posterior pair (Fig. 2C). Accessory boss present (Fig. 2C).

Labrum with 5, 5, 4 chaetae, four prelabrals present. Head of maxilla of the C. armatatype. Maxillary outer lobe with two sublobal hairs. Labium of the C. armata type, with five papillae (A–E) and six proximal chaetae. Guard chaetae a1, b1–2, d2, e2 and lateral processus (l.p.) as accessory papillae with short terminal sensillum. Guards b3–4, d3–4, and e1–6 with long sensilla. Dorsal guards b3–4, d3–4, and e3 distally expanded and flattened.

Chaetotaxy. Differentiation of dorsal chaetae into micro-/meso- and macrochaetae quite distinct (Figs 1A, 1B, 2D, 3C). Arrangement of chaetae on head typical for the genus, spine-like chaetae absent. Cephalic chaetae d2, 4, v2, p3,4, g1, 5, l01, l11 as macrochaetae. Dorsal chaetotaxy of B type (sensu Gisin 1947, Bourgeois and Cassagnau 1972, and Babenko et al. 1994) (Fig. 1B). Chaetae of medium length, pointed and serrated. Th. I with macrochaetae p4, without p2. Th. II–III with macrochaetae p2 (shifted forward), p5, 6, m5, chaetae m4 and m5 (Th. II with m4’and microsensillum ms), chaetae p4 m6 as sensorial chaetae s, chaetae a2 as long as a3. Abd. I–III with macrochaetae p2,6, sensorial chaetae s = p5. Abd. IV with macrochaetae p1, 3, 6, s-chaetae as p4. Abd. V with macrochaetae p1, 5, 4 + 4 a-chaetae inside two macrochaetae p5 (a2, 2’ absent, chaeta a5 straight above p5) (Figs 1B, 3C). Body s-chaetae relatively long, but shorter than macrochaetae, only on Abd. V as long as macrochaetae p1, 5 (Figs 1A, B, 3C).

Figure 1. 

Ceratophysella skarzynskii sp. n. A Chaetotaxy of head and Th. I–III B Chaetotaxy of Abd. I–VI. Scale bars: 0.1 mm.

Figure 2. 

Ceratophysella skarzynskii sp. n. A ant. III and IV dorsal B ant. III and IV dorsal C PAO and eyes D macro-, microchaetae and s-chaeta. Scale bars: 0.01 mm.

Figure 3. 

Ceratophysella skarzynskii sp. n. A tibiotarsus and claw III B dens and mucro C abd. V and VI D set of dens chaetae. Scale bars: 0.01 mm.

Tibiotarsi I, II, III with 19, 19, 18 chaetae respectively, including one acuminate tenent hair A1 each, femora with 13, 13, 12 chaetae, trochanters with 7, 7, 7 chaetae, coxae with 3, 7, 8 chaetae, subcoxae II with 0, 3, 3 chaetae, subcoxaeI with 1, 2, 3 chaetae. Claws with inner tooth and two pairs of lateral teeth. Empodial appendage with broad basal lamella and apical filament reaching slightly below inner tooth (ratio empodial filament: inner edge of claw = 0.47) (Fig. 3A). Ventral tube with 4 + 4 chaetae.

Retinaculum with 4 + 4 teeth. Furca well developed. Ratio dens + mucro: inner edge of claw III = 2.11: 1, ratio dens: mucro = 1.79: 1. Cuticular skeleton of furca well visible. Dens with uniform granulation and seven dorsal chaetae of which five are modified, two strongly thickened and three moderately so; basal macrochaeta longer than others chaetae, shorter than dens (3/5 of its length). Mucro boat-like with clear outer lamella (Fig. 3B, D).

Anal spines as long as inner edge of claw III slightly curved, situated on basal papillae, colourless (Figs 1B, 3C).

Etymology

The species is cordially dedicated to our colleague and friend Dr Dariusz Skarżyński, a prominent Polish specialist in Hypogastruridae, Collembola.

Remarks

The new species belongs to the armata-group of species, group B (Abd. tergum IV with p1 as macrochaeta) and subgroup B2 (Abd. tergum IV without chaeta p3) (Bourgeois and Cassagnau 1972). Among the species which could belong to this subgroup,C. skarzynskii is most similar to four species: C. denisana (Yosii, 1956), C. empodialis Babenko, 1994 (in Babenko et al. 1994), C. longispina (Tullberg, 1876), and C. scotica (Carpenter & Evans, 1899), due to the absence of transformed into spines, spine-like chaetae or spine-like integumentary protuberance on the head or Abd. V. They differ in the shape of the apical vesicle, the number of modified chaetae on the dens, the number of peg-like chaetae in the ventral sensory file on Ant. IV, length of empodial appendage,in the type of dorsal chaetae (serrated or smooth), and in the number of sublobal hairs on maxillary palp (one or two). A comparison of these species is presented in Table 1.

Morphological characters for C. skarzynski sp. nov. and similar species: C. denisana Yosii, 1954 (Yosii 1956), C. empodialis Babenko, 1994, C. longispina (Tullberg, 1876) and C. scotica (Carpenter & Evans, 1899) after authors and Babenko et al. (1994).

Species/characters C. denisana C. skarzynskii C. empodialis C. longispina C. scotica
Maximal body size (mm) 1.20 1.09 1.80 2.00 2.00
Yosii’ parameter 14–16 (20) 10–14 8–13 12–16 13–15
Ant.IV: apical vesicle trilobed trilobed simple/slightly bilobed simple/slightly bilobed simple
Ant.IV: number of peg-like chaetae in ventral file >50 30–32 20 max. 15 15–20
Maxillar palp: number of sublobal hairs 2 2 2 2 1
Dorsal chaetae smooth serrated rather smooth serrated rather smooth
Th.II–III: length of chaetae s = p4/p3 p4 >p3 p4 >p3 p4 >p3 p4≈p3 p4≈p3
Abd. V: chaetae s = p3/p1 p3≈p1 p3≈p1 p3<p1 p3≈p1 p3<p1
Tibiotarsial tenent hair ? pointed pointed ? pointed
Empodial appendage : inner edge of claw ±½ ±½ ±1¼ ±½ ±1
Empodial basal lamella : inner edge of claw 1/4 1/5 1/5 ? 1/5
Lateral teeth of claw basal 3 pairs 2 pairs 2 pairs 2 pairs 2 pairs
Chaetae on dens: total number/numer of modified chaetae 7/5 7/5 7/2 7(8)/2 7/2

Ceratophysella communis (Folsom, 1898)

Acorutes communis Folsom, 1898: 52.

Syn: Hypogastrura yuasai Yosii, 1954: Yosii 1960.

Studied material

China: Henan: Zhengzhou, on Pleurotus ostreatus, 7 specimens on slides and 20 in alcohol, leg. Xin Sun, 05 Dec 2014; China: Henan: Zhumadian, on Pleurotus ostreatus, 9 specimens on slides and 50 in alcohol, leg. ZhijingXie, 10 Nov 2017; China: Zhejiang: Pinghu, on Pleurotus ostreatus, 13 specimens on slides and 100 in alcohol, leg. Xin Sun, 07 Dec 2014; China: Sichuan: Qingchuan, on Morchella esculenta, 4 specimens on slides and 30 in alcohol, leg. Zhijing Xie, 19 Mar 2017.

Ceratophysella denticulata (Bagnall, 1941)

Achorutes denticulatus Bagnall, 1941: 218.

Syn: Achorutes armata var. nov. cuspidate Axelson, 1905: Thibaud et al. 2004.

Achorutes distinguendus Bagnall, 1941: Thibaud et al. 2004.

Hypogastrura (Ceratophysella) exilis Yosii, 1956: Yosii 1965.

Hypogastrura (Ceratophysella) afghanistanensis Stach, 1963: Thibaud et al. 2004.

Studied material

China: Tibet: Lasa, on Ganoderma sp., 9 specimens on slides, leg. Weiping Xiong, 27 Mar 2015.

Ceratophysella liguladorsi (Lee, 1974)

Hypogastrura liguladorsi Lee, 1974: 95.

Studied material

China: Zhejiang: Wuyi, on Lentinus sp., 11 specimens on slides and 80 in alcohol, leg. Xin Sun, 09 Dec 2014.

Key to the Chinese species of Ceratophysella

In 2007 Wu and Yin proposed a key to the six species of the genus Ceratophysella known from China. Jia et al. (2010) proposed a list of 14 Chinese species of Ceratophysella. The present key includes 15 species. Some of the species are not sufficiently described, but the available characters given in the descriptions are sufficient to include them in the key. The characters for C. adexilis have been verified on type material, and for C. communis on fresh material from the type locality (Tokyo).

1 Abd. IV with p1 chaeta shorter than p2 chaeta (A-type) 2
Abd. IV with p1 chaeta longer than p2 chaeta (B-type) 9
2 Dens with 6 chaetae 3
Dens with 7chaetae 5
3 Unguiculus as long as 1/2–1 of internal edge of claw 4
Unguiculus very short, as long as 1/3, claw without teeth C. zhangi (Zhao, 1998)1
4 Labial palp with 4 papillae (papilla C absent), macrochaetae rather short, Th. II with p4 = s longer thanmacrochaeta p5 C. succinea (Gisin, 1949)
Labial palp with 5 papillae (papillae A–E present), macrochaetae long, Th. II with p4 =shorter than macrochaeta p5 C. taiguensis Jia, Skarżyński & Li, 2010
5 Body chaetae smooth 6
Body chaetae serrated 8
6 Dens with thickened chaetae 7
Dens without thickened chaetae C. yinae (Yue & Fu, 2000)
7 Four internal chaetae on dens thickened, Ant. IV with 8 dorsal sensilla C. baichengensis Wu & Yin, 2007
Two internal chaetae on dens thickened, Ant. IV with 7 dorsal sensilla C. adexilis Stach, 1964
8 Abd. V tergum with chaeta a2’ present, Ant. IV with simple apical vesicle, Abd. IV tergum with p5=s equal to ½ macrochaetae C. denticulata (Bagnall, 1941)
Abd. V tergum without chaeta a2, Ant. IV with bi- or trilobed apical vesicle, Abd IV with chaeta p5=s equal to ¾ macrochaetae C. communis (Folsom, 1898)
9 Abd. V tergum with cuticular projection or medial spines 10
Abd. V tergum without such projection or spines 11
10 Abd. V tergum with medial cuticular projection, dens with 7 normal chaetae, ventral sensory file (sensory rasp) with ca. 40 peg-like sensilla C. liguladorsi (Lee, 1974)
Abd. V tergum with chaetae p1 modified in spines, dens with 7 chaetae among which two modified, central sensory file (sensory rasp) with ca. 25–35 peg-like sensilla C. duplicispinosa (Yosii, 1954)
11 Head with chaetae d5 and sd5 modified into spines 12
Head without chaetae modified into spines 13
12 Length of unguiculus as 1/3 of inner edge of claw, tibiotarsi with A1 (tenent hair) short (= ½ of inner edge of claw) C. xiaoi (Tamura, 1998) (in: Tamura and Zhao 1998)
Length of unguiculus as 1/2 of inner edge of claw, tibiotarsi with A1 (tenent hair) long (= length of inner edge of claw) C. anshanensis (Wu & Xie, 2007)
13 Head without a pair of cornea-like convexity 14
Head with a pair of cornea-like convexity C. sinensis Stach, 1964
14 Dens with thickened chaetae, tibiotarsi with prolonged chaeta A1 as pointed tenent hair, claws with one internal tooth and two pairs of lateral teeth C. skarzynskii sp. n.
Dens without thickened chaetae, tibiotarsi without prolonged chaeta A1, claws without internal and lateral teeth C. flectochaeta Lin & Xia, 1983

Acknowledgements

We would like to express our thanks to Dariusz Skarżyński, Anatoly Babenko, and Louis Deharveng for their valuable and helpful advice. We are also grateful to Taizo Nakamori for collecting C. communis specimens in the type locality. The present study was mainly supported by funding from the National Basic Research Program of China (No. 2016YFA0602303-1), the National Natural Science Foundation of China (No.: 41571052, 41430857, 41811530086), the Science and Technology Development Plan Project of Jilin Province (No. 20160520051JH), the Postdoctoral Science Foundation of China (No. 2015M570281), the funding provided by the Alexander von Humboldt Foundation, the Youth Innovation Promotion Association, CAS, and the academic exchange program between Chinese and Polish Academies of Sciences.

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1following the description in Tamura and Zhao 2008