Leptus sidorchukae,

Costa, Samuel Geremias Dos Santos, Klompen, Hans, Bernardi, Leopoldo Ferreira De Olivei- Ra, Gonçalves, Luciana Cardoso, Ribeiro, 2019, Multi-instar descriptions of cave dwelling Erythraeidae (Trombidiformes: Parasitengona) employing an integrative approach, Zootaxa 4717 (1), pp. 137-184: 159-168

publication ID

https://doi.org/10.11646/zootaxa.4717.1.10

publication LSID

lsid:zoobank.org:pub:D02BC715-6A77-4BD2-B452-51EAC10C6F99

persistent identifier

http://treatment.plazi.org/id/740587ED-FFC9-352C-FF30-FB1E49FB1371

treatment provided by

Plazi

scientific name

Leptus sidorchukae
status

sp. nov.

Leptus sidorchukae  sp. nov.

Diagnosis

Larva: Idiosoma bearing 114–118 (N= 5) dorsal setae, ventral surface with a shorter pair of barbed setae between coxae I, four setae between coxae II and nine setae between coxae II and III. Palp setal formula: 0-2B-2B-3B- 4B1N1ζ1ω. Gnathosoma conical, as barbed, long (40–46) and placed laterally; bs shorter (32–37) than as, thin and barbed; tibia and genu I each bearing one piriform microseta (κ1 and κ2). Deutonymph: center eyes 234–296 (N= 5) apart (O —O), dorsal setae 36–66 long, barbed and evenly distributed. Eyes cornea diameter (O) 17–23 (N= 7), eyes relatively small ( Fig. 10A and BView FIGURE 10) when compared with the correlated intersensillar distance ISD/O=10.61–12.76 (N= 7). Crista metopica 293–335 (N= 5) restricted to the anterior half of the idiosoma. Sensillar area with 3–4 short (30–46, N= 5) barbed setae, anterior to sensilla. Tibia and genu I each with one microseta (κ) placed at their distal end, shape similar to that in larva ( Fig. 10C and GView FIGURE 10). Female: O=24–28; O—O= 369–535 (N= 5). Eyes relatively small ( Fig. 11A and BView FIGURE 11) when compared with the intersensillar distance ISD/O= 14.39–15.2, N= 3. Crista metopica 417–490 (N= 5) restricted to the anterior half of idiosoma. Anterior sensillar area with 7–8 short (40–70, N= 5) barbed setae anterior to sensilla. Genital pore 270–302 (N= 5) with two pairs of oval, small, and overlapping genital acetabula, placed at the posterior half of the genital pore. Tibia and genu I each with one microseta (κ) placed at their distal end, shape similar to that in larva. Male: O—O=370–414 (N= 2), O=26–29 (N= 2); Eyes relatively small ( Fig. 13A, BView FIGURE 13 and 22AView FIGURE 22) when compared with the intersensillar distance ISD/O=14.17–14.23 (N= 2). Similar to females in most respects. Genital pore 198, with 25 setae on each genital epivalve (N= 1). Internally, operculum composed of two anteriorly articulated longitudinal sclerites of the ejaculatory complex with 11 eugenital setae on each side over protuberances (N= 1).

Type Material. Holotype: Larva UFMG AC 151093View Materials collected at 19°34’36.0”S, 44°01’13.0”W, in an unnamed limestone cave, Pedro Leopoldo municipality, Minas Gerais State, Brazil, between July 22 th and August 18 th of 2015. Larval paratypes: UFMG AC 150875View Materials, 151098, 151100 and 151510. Deutonymphal paratypes: UFMG AC 150321View Materials, 150323, 150326, 151101, 151206, 150710, 150711, 150717, 150729, 151208 and 150730. Female paratypes: UFMG AC 150693View Materials, 151245, 151107 and 151108. Male paratypes: UFMG AC 150853View Materials, 150725 and 150932. The specimens were collected in the entrance, penumbra and aphotic zone from Gruta do Salitre and other unnamed caves (See Table I for detailed collecting data).GoogleMaps 

Description

Larvae: Measurements summarized in Table II. Idiosoma oval. Dorsal scutum punctate, wider than long, with two pairs of scutella and two pairs of sensilla; anterior sensilla more barbed in distal half, posterior sensilla homogeneously barbed ( Fig. 8CView FIGURE 8). Idiosoma bearing 114–118 (N= 5) dorsal setae, ventral surface with a short pair of barbed setae between coxae I (1a), four setae between coxae II and nine setae between coxae II and III, followed by 31–35 barbed setae ( Fig. 8D, EView FIGURE 8).

Gnathosoma conical, as barbed, long (40–46; N= 5) and placed laterally; bs shorter (32–37) than as, thin and barbed. Short (16) and smooth galeala (cs) visible in only a few specimens. Palpal setal formula: 0-2B-2B-3B- 4B1N1ζ1ω. Palp tibial claw entire ( Fig. 8A, BView FIGURE 8).

Legs with seven segments each, all normal setae barbed ( Fig. 9View FIGURE 9). All tarsi bearing a pair of claws and a claw-like empodium; anterior claw with onychotrichs (tiny spine-like projections), posterior claw lacking a hook element and bearing ventral setules ( Fig. 9D, E, FView FIGURE 9). Tibia and genu I each bearing one distally enlarged, piriform, distal microseta ( Fig. 9AView FIGURE 9).

Leg setal formula:

Leg I: Ta—23B,1Cp, 2 ζ, 1 ω; Ti—15B, 1κ, 2 φ; Ge—8B, 1κ, 1σ; TFe—5B; BFe—3B; Tr—1B; Cx—1B.

Leg II: Ta—22B, 1 ω, 2 ζ; Ti—15B, 2 φ; Ge—8B, 1κ, 1σ; TFe—5B; BFe—3B; Tr—1B; Cx—1B.

Leg III: Ta—22B, 1 ζ; Ti—15B,1 φ; Ge—8B; TFe—5B; BFe—2B; Tr—1B; Cx—1B.

Deutonymph: Measurements summarized in Table III. Color in life unknown. Idiosoma oval ( Fig. 10AView FIGURE 10). Dorsal setae 36–66 (N= 5) long, barbed and homogeneous in shape, size and color ( Fig. 10BView FIGURE 10). Short (293–335) crista metopica restricted to anterior half of idiosoma, positioned between a pair of small eyes (O= 17–23, N= 7), eyes relatively distant from each other (center eyes 234–296 apart; N= 5) and 117–148 (N= 5) distant from the center of the crista metopica. To compare the eye development to other species, we introduce the ratio of intersensilar distance to eye cornea diameter, ISD/O=10.61–12.76 (N= 7). This ratio shows the reduction of the eyes in relation to the ISD. Crista with two pairs of filiform sensillary setae with faint setules and two to four short (30–46) barbed setae in anterior sensillar area, inserted anterior to sensilla ( Fig. 10BView FIGURE 10). Anal valves weakly developed, bearing 3–8 (N= 5) setae on each valve, asymmetrically distributed ( Fig. 10HView FIGURE 10).

Gnathosoma conical bearing two long and stylet-like chelicera ( Fig. 10AView FIGURE 10). Palps long, bearing numerous barbed setae, palp tibial claw entire; length similar to that of cylindrical palp tarsus, which carries numerous distal eupathidia ( Fig. 10D, EView FIGURE 10).

Relative legs lengths: IV>I> III>II. Leg scobalae, numerous, pointed and barbed ( Fig. 10C and GView FIGURE 10). Tibia and genu I each bearing one piriform microseta (κ1 and κ2); shape and position as in larva ( Fig. 10F, EView FIGURE 10).

Female: Measurements summarized in Table IV. Color in life unknown. Idiosoma oval ( Fig. 11AView FIGURE 11). Dorsal setae similar to deutonymph ( Fig. 10BView FIGURE 10, 11View FIGURE 11 A–B). Short crista metopica (417–490 N= 5) restricted to anterior half of idiosoma; positioned between a pair of small eyes, which are 369–535 (N= 5) apart. Crista carries two pairs of filiform sensillary setae with faint setules and 7–8 short (40–70, N= 5) barbed setae in anterior sensillar area, inserted anterior to sensilla ( Fig. 11BView FIGURE 11). Genital pore elongated, bearing two pairs of small genital acetabula (G. ac.), both with the same oval shape and inserted in posterior half of genital pore ( Fig. 12BView FIGURE 12).

Gnathosoma conical ( Fig 11AView FIGURE 11), bearing two stylet-like cheliceral blades. Palps bearing numerous barbed setae of the same shape; palp tibial claw entire, similar in length to the cylindrical palp tarsus ( Fig. 11C, DView FIGURE 11); palp tarsus with numerous distal eupathidia ( Fig. 12CView FIGURE 12).

Relative legs lengths: I>IV>III>II. Leg scobalae, numerous, pointed and barbed ( Fig. 12A, DView FIGURE 12). Tibia and genu I each bearing one piriform microseta (κ1 and κ2, Fig. 12A, DView FIGURE 12).

Male: Measurements are summarized in Table V. Color in life unknown, somatic characters similar to females. Dorsal setae barbed ( Fig. 13A, BView FIGURE 13). Short (474–560 N= 3) crista metopica positioned between a pair of small eyes and restricted to anterior half of idiosoma. Crista with two pairs of filiform sensillary setae with faint setules and 6–8 short (40–70 N= 3) and barbed setae in anterior sensillar area, inserted anterior to sensilla ( Fig. 13BView FIGURE 13). Anal pore positioned ventrally near genital pore ( Fig. 13CView FIGURE 13).

Genital pore elongated, bearing 25 setae on each side of the external border. Internally, the operculum is composed of two, anteriorly articulated, longitudinal sclerites of the ejaculatory complex each of which has 11 eugenital setae over protuberances on each side (black arrow on Fig. 13CView FIGURE 13). Tips of proximal arms of ejaculatory complex distinguishable and indicated on Fig. 13CView FIGURE 13.

Gnathosoma conical ( Fig 13E, FView FIGURE 13), bearing two stylet-like cheliceral blades. Palps bearing numerous barbed setae with the same shape, palp tibial claw entire; length similar to that of the cylindrical palp tarsus ( Fig 13E, FView FIGURE 13); tarsus with numerous distal eupathidia ( Fig. 13HView FIGURE 13).

Relative legs lengths: I>IV>III>II. Leg scobalae, numerous, pointed and barbed. Tibia and genu I each bearing one piriform microseta (κ1 and κ2, Fig. 13D, GView FIGURE 13).

TABLE V. Metric data for the males of Leptus sidorchukae sp. nov. and Charletonia rocciai Treat & Flechtmann, 1979. Some of the metric characters are not applicable for all species and are marked by (NA).

Character Mean (n=3) Le. sidorchukae  sp. nov. Range   C. rocciai Value  (n=1)
IL 1431.0 1322.0 1540.0 1845.0
Overall length 1775.0 1685.0 1865.0 2037.0
IW 1020.5 793.0 1248.0 1337.0
Sba 20.7 19.0 22.0 18.9
Sbp 24.0 22.0 25.0 19.1
Asens 110.5 109.0 112.0 85.0
Psens 127.0 97.0 157.0 117.0
ISD 402.7 370.0 427.0 375.6
Crista`s common setae 55.3 47.0 74.0 76.7–161.4
pDS I 43.7 34.0 54.0 54 –123
pDS II NA NA NA 28–46
pVS I 39.0 25.0 45.0 89–146
pVS II NA NA NA 30–38
ASAW 52.0 49.0 58.0 104.3
PSAW 48.0 45.0 50.0 61.7
CML 526.0 474.0 560.0 581.0
O 27.5 26.0 29.0 55.1
OL 38.0 38.0 38.0 76.4
O—O 392.0 370.0 414.0 489.7
OASns 221.5 212.0 231.0 277.0
Cx I 198.3 188.0 211.0 403.0
Tr I 128.0 118.0 137.0 245.6
BFe I 354.0 305.0 411.0 454.0
TFe I 447.0 408.0 492.0 655.1
Ge I 484.3 451.0 537.0 574.6
Ti I 486.7 449.0 536.0 622.1
Ta I (L) (with claw) 383.0 366.0 414.0 464.2
Ta I (W) 87.3 82.0 95.0 193.1
Leg I (without Cx) 2283.0 2097.0 2519.0 3084.8
Cx II 286.3 265.0 302.0 407.7
Tr II 121.0 111.0 133.0 189.6
Bfe II 159.0 143.0 168.0 154.3

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UFMG

Universidade Federal de Minas Gerais

AC

Amherst College, Beneski Museum of Natural History