Hymenaphorura urbana, Weiner & Fiera, 2020

Weiner, Wanda Maria & Fiera, Cristina, 2020, Two new species of Hymenaphorura Bagnall, 1948 (Collembola, Onychiuridae) from Romania and an updated key to the genus, ZooKeys 960, pp. 17-38 : 17

Hymenaphorura urbana sp. nov. Figures 3A-H , 4A-F , Table 2

Hymenaphorura nova - Fiera 2009: 871

Material examined.

Holotype: female (RO-Hym4-IBB): Romania, Bucharest, Cişmigiu park, soil under Thuja orientalis L., 44.4365N, 26.0901E, 72 m a.s.l., 05.XII.2013, coll. C. Fiera. Paratypes: 3 females (2 in IBB: RO-Hym5,6-IBB and one in ISEA: RO-13-1), 2 males preadults (one in IBB: RO-Hym7-IBB and one in ISEA: RO-13-2), 2 juveniles (one in IBB: RO-Hym8-IBB and one in ISEA:RO-13-3), Bucharest, Cişmigiu park, same data as holotype.

Other material.

one male preadult and one female (IBB: RO-Hym9,10-IBB), Bucharest, Unirea park, 44,427980N, 26,101367E, 72 m a.s.l., 05.XII.2013, coll. C. Fiera.

Diagnosis.

Body with distinct areas of coarser granules. Dorsal pso formula as 10/011/11112, ventral pso absent. PAO with 13-15 simple vesicles, parallel or oblique in relation to the long axis of this organ (Fig. 3B ) and one border seta. Abd. terga I-III with subequal setae p2 and p3. Abd. tergum V granular area with 3+3 distinct, long macrosetae. Distal tibiotarsal whorl with 11 setae.

Description.

Measurements (in mm). Holotype female length 1.82, length of paratypes males: preadult 1.34-1.47, paratypes females: 1.50-1.88, females juvenile: 1.26-1.34.

Body. Body elongate, cylindrical (Fig. 3C ). Colour in alcohol white. Distinctive areas of granulation on dorsal side of the body of c2 type (sensu Arbea and Jordana 1994). Usually 9-11 grains around each pseudocellus (Fig. 3B ).

Antennae and head. Antennae almost as long as head. Antennal segment I with 8 setae, antennal segment II with 16 setae. AIIIO consisting of four guard setae, five papillae, two smooth sensory rods, two granulated sense clubs: ribbed and bent, ventro-lateral microsensillum present. Second external papilla in AIIIO not forked. Antennal segment IV without distinct sensilla, small subapical organite in deep, narrow pit and latero-external microsensillum last posterior row of setae (Fig. 3A ).

PAO with 13-15 simple vesicles, parallel or oblique in relation to the long axis of this organ, PAO groove border with one seta (Fig. 2B ). Labral formula of setae: 4/3,2,2. Maxillary palp simple with two sublobal sensory hairs. Labial type A (sensu Fjellberg 1999) with four papillae, papilla E absent (Fig. 3E ). Small guards a1, b1-2, d2. Five other guards as long as terminal sensilla of papillae.

Pseudocellar , Parapseudocellar , Pseudopores Formulae. Pseudocellar formula per half tergum dorsally: 10/011/11112 (Fig. 3C ), ventrally and on subcoxae 1 absent. Parapseudocelli (psx) not always visible, their formula per half segment: 01/111/1111 dorsally and 111111m ventrally. Subcoxae 1. with 2 psx each, each femur with one psx. Pseudopores 11/1111 dorsally. Abdominal sterna II-IV with one medial pseudoporus each: abdominal sternum II with pseudoporus between two rows of setae, abdominal sternum III with pseudoporus in posterior row, abdominal sternum IV with pseudoporus placed behind margin of manubrial area (below row p).

Dorsal chaetotaxy. Dorsal chaetotaxy, always with some asymmetry, as in Figs 3C , 4A-F with macro- and meso/microsetae of different length. Seta d0 on the head absent, Sensory setae s very slightly marked, well differentiated on abdominal tergum V. Thoracic terga II and III with lateral microsensilla (ms). Thoracic tergum I with 8-12+8-12 setae (holotype: 8+10). Thoracic terga II-III with 7+7 fairly strong and subequal short macrosetae. Abdominal terga I-IV with 3+3 macrosetae, abdominal terga I-III with subequal p2 and p3. Abdominal tergum V with three long macrosetae (a4, p3 and p6). One macroseta in the set of setae on subcoxae 1 and abdominal pleura I-IV and 2 macrosetae on abdominal pleurum V. Abdominal tergum VI with medial setae a0, m0 and p0. Anal spines as long as inner edge of claw and 3 times as long as their basal diameter. Basal papillae low.

Ventral chaetotaxy, furcal rudiment. Thoracic sterna II and III with 1-2 +1-2 setae respectively. Ventral tube with 8-12+8-12 setae (in holotype as 8+10). MVO in preadult males absent (adult males unknown).

Furcal rudiment with sternum with three irregular rows poorly distinguished comparing with other part of sternum. Setulae only sometimes distinguished (Fig. 3F ). Basal papillae small as a half of width of spines. Each of even anal valves with 3 setae in row a (a1-a0-a1) and five setae in b-row (b2-b1-b0-b1-b2); upper valve with one seta in a-row (a0), four setae in b-row (b2-b1-b1-b2) and with three subequal setae in row c (c2-c0-c2) (Fig. 3H ).

Legs. Chaetotaxy of legs I, II and III as follows: subcoxae 1 with 4, 5(6), 5(6) setae, subcoxae 2. with 1, 5(4), 5(4) setae, coxae with 4, 11(10), 11(14) setae, trochanters with 11 (10), 11(10), 10 setae, femora with 17 (16), 16, and 14(15) setae, tibiotarsi with 3 whorls of setae: 20 (1,8,11), 20 (1,8,11), 19 (1,7,11) setae respectively. Seta M present. Claw without internal denticle, with pair of lateral teeth. Empodial appendage with small, narrow basal lamella, length of empodium is about ⅔ of inner edge of claw (Fig. 3D ).

Ecology.

This species lives in the urban habitats of Bucharest.

Etymology.

The species name refers to the urban area where it was sampled (Latin, urbanus).

Remarks.

Hymenaphorura urbana sp. nov. belongs to the group of Hymenaphorura species with one seta in the PAO groove border, p2 seta subequal to p3 on abdominal terga I-III, and three macrosetae on the granulated area of abdominal tergum V. The new species shares these characters (Table 2 ) with H. alticola (Bagnall, 1935), H. arantiana Weiner & Stomp, 2001, H. improvisa Pomorski & Skarżyński, 2000, H. nearctica Pomorski, 2001, H. nicol ae Barra, 1998, H. nova Pomorski, 1990, H. polonica Pomorski, 1990, H. similis (Folsom, 1917), and yoshii Paśnik & Weiner, 2018 (Table 2 ).

Hymenaphorura urbana sp. nov. differs of H. nearctica and H. yoshii by the presence of one seta on border of PAO groove vs two setae; it differs of H. yoshii and H. improvisa by the pseudocelar formula (10/011/11112 vs 10/111/11112), of H. improvisa and H. similis by the number of setae in the tibiotarsal distal whorl (11 in the new species vs 9 in H. improvisa and similis ). The new species differs of H. nova by the labial type (A vs 0 in nova ) as well as by the number of vesicles in PAO (13-15 vs 9-11). Setae p2 and p3 are subequal in the new species and p3 is longer than p2 in H. alticola and H. nicolae . Hymenaphorura urbana sp. nov. differs of arantiana by length of empodial appendage, which length is equal with the inner edge of claw III and size (1.39-1.92 mm for urbana vs 0.77-1.0 mm for arantiana ). The new species is most similar to polonica , but H. polonica has only 10 vesicles in PAO and urbana has 13-15, and the granulation of Abd. tergum V is very coarse and presents cauliflower-like areas in H. polonica .

Figures

Figure 2. Hymenaphorura kalindera sp. nov.: dorsal chaetotaxy. A head B thoracic tergum I C thoracic tergum II D abdominal tergum II E abdominal tergum III F abdominal tergum IV G abdominal tergum V H abdominal tergum VI.

Figure 3. Hymenaphorura urbana sp. nov. A antennal segment III and IV B postantennal sensory organ and anterior cephalic pseudocellus C habitus and dorsal chaetotaxy D leg III: tibiotarsal chaetotaxy and claw E labial palp F abdominal sternum IV with furcal rudiment G abdominal terga V and VI H abdominal sternum VI: anal valves. Scale bars: 0.05 mm (A, B, D-H); 0.1 mm (C).

Figure 4. Hymenaphorura urbana sp. nov.: dorsal chaetotaxy. A head B thoracic tergum II C abdominal tergum II D abdominal tergum IV E abdominal tergum V F abdominal tergum VI.