Serianus galapagoensis Beier, 1978

Mahnert, Volker, 2014, Pseudoscorpions (Arachnida: Pseudoscorpiones) from the Galapagos Islands (Ecuador), Revue suisse de Zoologie 121 (2), pp. 135-210 : 168-171

publication ID

https://doi.org/ 10.5281/zenodo.6119794

publication LSID

lsid:zoobank.org:pub:7F3D846E-2842-41B4-9D37-18C86AE01259

persistent identifier

https://treatment.plazi.org/id/03B1AE75-205B-1D7B-FF48-FC4DDE6D2031

treatment provided by

Carolina

scientific name

Serianus galapagoensis Beier, 1978
status

 

Serianus galapagoensis Beier, 1978 Fig. 43

Serianus galapagoensis Beier, 1978: 536-538 , fig. 3 (type locality: Santa Fé, Landebucht, Vegetation über dem Strand ).

Serianus pusillimus (not Beier, 1959): Beier, 1978: 536 - misidentification.

SPECIMENS STUDIED: Champion NE Floreana: 1♀ 1P; arid zone, litter sifting, cactus, 22.IV.1992, leg. S. Peck (92-136). – Espanola: 39329; 3♀; “ 100 m Hill”, 90 m, under lava slabs in lava sand, Bursera-Cordia-Prosopis-Lantana assoc., 8.II.1977, leg. W. G. Reeder. – 39303; 13 2♀ 1T; Punta Cevallos camp beach berm, 2 km W of Punta Cevallos, screened from litter of Prosopis and Vallesia, 8.II.1977, leg. W. G. Reeder. – 39325; 13; Punta Cevallos area, radar site, 100 m, screened from old finch nest in dead Prosopia, 9.II.1977, leg. W. G. Reeder. – RBINS; 13; Punto Cevallos, zone côtière, 0-5 m, 3.III.1988, leg. L. Baert, J.-L. Maelfait & K. Desender (B.88/358). – 39300; 13; 3 km from Punta Cevallos, 30 m, single Bursera View in CoL on rock outcrop, with Lantana and Prosopis, from Bursera View in CoL litter, 11.II.1977, leg. W. G. Reeder. – 39434; 1♀; 3 km N of Punta Cevallos, 25 m, screening of old finch nest in Opuntia, Lantana, Prosopis View in CoL , 11.II.1977, leg. W. G. Reeder. – 1♀; Bahia Manzanillo, Prosopis grove behind beach, dung trap, 8.-10.V.1985, leg. S. & J. Peck (85-184). – 1T; same locality, carrion traps, 5.-10.VI.1985, leg. S. & J. Peck (85-185). – 1♀; Bahia Manzanillo, 5 m, arid zone, FIT, 23.IV.-2.V.1992, leg. S. Peck (92-146). – 123 12♀ 3T 4D 3P; Punta Suarez, 10 m, litter under bushes in seabird rookery, 10.VI.1985, leg. S. & J. Peck (85-187). – 2♀ 2P; Punta Suarez, near Blow Hole, littoral zone, under Sesuvium edmonstonei View in CoL , well decayed leaf litter, dry to moist and salty, 7.IV.1985, leg. H. & I. Schatz (85-350). – 1♀ 1T; Punta Suarez, 30 m, shrub litter, 29.IV.1992, leg. S. Peck (92-144). – 23 2♀; ridge crest, 125 m, tortoise droppings, 30.IV.1992, leg. S. Peck (92-151); – 1♀ 1D; Punta Suarez, 10 m, Cordia-Cryptocarpus litter, 2.V.1992, leg. S. Peck (92-152). – Fernandina: TNSC 39337; 13; W slope, 500 m, above base camp crater, under bark of downed Zanthoxylum View in CoL in Psychotria shrub; 17.VIII.1977, leg. W. G. Reeder. – MHNG; 2♀; Cabo Hammond, cormorant nests. 29.V.1996, leg. S. Peck (96-208). – Floreana: TNSC 39244; 1♀; Loberia, south of Black Beach, screening litter, 18.II.1979, leg. W. G. Reeder. – RBINS/MHNG; 33 1♀; Black Beach, Cryptocarpus litter, 24.III.1989, leg. S. Peck (89-149). – MHNG; 13 2♀; 1 km S Black Beach, crevice, litter supralittoral, 23.III.1989, leg. S. Peck (89-157). – 1D; Punta Cormoran, 5 m, leaf litter under Waltheria ovata View in CoL , dry zone, 6.IV.1985, leg. H. & I. Schatz (85- 327). – Gardner at Espanola: TNSC 39315; 13; 20 m, under rocks in shade of Opuntia View in CoL , Bursera-Croton-Cordia community, litter thin, very dry, 13.II.1977, leg. W. G. Reeder. – 39323; 23 2♀ 1T; 20 m, litter of large Opuntia View in CoL , Bursera-Croton-Cordia community, 13.II.1977, leg. W. G. Reeder. – RBINS; 2♀; littoral zone between Sesuvium, 24.III.2000, leg. L. Baert, J.-P. Maelfait & K. Desender (B00/059). – 1♀; “summit”, dry zone with Cordia lutea View in CoL , Croton scouleri View in CoL , Bursera graveolens, Lantana View in CoL peduncularis; grass and leaf litter on red soil, sifted, 30 m; 14.III.1987, leg. H. Schatz (87-H294). – Gardner at Floreana: 13 2♀ 1T 2D; arid zone, litter, 2.V.1992, leg. S. Peck (92-148). – Genovesa: 39327; 23; Bahia Darwin, 15 m, screened from litter of Cordia lutea View in CoL and Croton View in CoL , also beneath small lava rocks in litter (also Opuntia View in CoL , Bursera View in CoL ), 22.XII.1975, leg. W. G. Reeder. – 39333, 39347; 23 3♀; southern rim crater, 65 m, sifting of dry litter of Bursera View in CoL and Croton View in CoL , with Lantana, dry rocky substrate, 23.X.1975, leg. W. G. Reeder. – 83 2♀ 1T 1D; Bahia Darwin, 1 m, back-beach, litter washing, 27.III.1992, leg. J. Cook & S. Peck (92-62). – 13; Bahia Darwin, 1 m, arid zone, dung trap, 10-25.III.1992, leg. S. Peck (92-11). – 1♀; inner of island, in Chamaesyce, sifted from dry litter, 14.II.1985, leg. H. & I. Schatz (85-H11). – Isabela: 13; Punta Garcia, W Volcan Darwin, in Aa lava flow at coast awashed spray area, littoral zone, 0 m; in mangrove belt, under Rhizophora mangle; algae from rocks, 21.II.1987, leg. H. Schatz (87-698). – 1♀; Punta Garcia, west of Volcan Darwin, in Aaflow at coast, awashed spray area, 0 m, in mangrove belt, under Laguncularia racemosa, algae from rocks and pumice, 21.II.1987, leg. H. Schatz (87-699). – Marchena: RBINS; 1♀; near fumaroles, 21.II.1974, leg. S. Jacquemart (97). – RBINS; 1♀; Playa Negra, dry arid zone, 21.II.1974, leg. S. Jacquemart (99). – RBINS; 1D; Playa Negra, border of the sea, 25.II.1974, leg. S. Jacquemart (107). – 39305; 43 2♀ 2T; SW slope beach camp area, screening of Waltheria litter, damp, with lava sand substrate, 25.I.1977, leg. W. G. Reeder. – 39296; 23; Cabo Espejo, SW slope above beach camp, removed from damp rotten Bursera View in CoL wood, Bursera-Croton community, 27.I.1977, leg. W. G. Reeder. – North Plazas: 39318; 2♀; 5 m, sweeping in Maytenus and Castela, Opuntia-Castela-Scutia association, 20.X.1975, leg. W. G. Reeder. – Pinta: RBINS; 2♀; transect to top, dry pampa zone, 25 m, 27.II.1974, leg. S. Jacquemart (109). – RBINS; 13; Eastern transect, Pisonia litter, 27.II.1974, leg. S. Jacquemart (117). – 39335; 13; near South Playa, 20 m, screening of very dry litter of Cordia View in CoL and Bursera View in CoL , substrate dry red lava sand, 22.IV.1977, leg. W. G. Reeder. – Pinzon: RBINS; 13; beach with Sesuvium, 20.I.1974, leg. S. Jacquemart (31B; 24965). – 1T; southern slope, Fern Sedge zone, 300 m, under Croton scouleri, Althernathera View in CoL echinocephala, Prosopis juliflora, Acacia macracnatha, Courmelina diffusa , Pteridium aquilinum View in CoL ; fern litter and roots with soil, 3.II.1987, leg. H. Schatz (87-601). – San Cristobal: 39367; 1♀; Cerro Felado, 450 m, from litter and moss-fern growth, base of lava blocks, soil well-drained, litter thin, Scalesia-Psychotria-Chiococca-Zanthoxylum comm., 17.II.1978, leg. W. G. Reeder. – 1T; Baquerizo, 10 m, arid zone FIT, 11.-23.II.1989, leg. S. Peck (89-48). – 53 15♀ 1P; Baquerizo, 3 km SE, littoral zone, litter under beach plants, 11.II.1989, leg. S. Peck (89-49). – 13 1♀; Baquerizo, 3 km SE, beachdrift, 12.II.1989, leg. S. Peck (89-54). – 1D; lake El Junco, 670 m, Miconia zone, fern litter under Miconia robinsoniana and Pteridium aquilinum View in CoL , 28.III.1985, leg. H. & I. Schatz (85-298). – RBINS; 13; Caleta Sapho, Puerto Grande, 2 m, 24.III.2009, leg. L. Baert, F. Hendrickx & W. Dekoninck (B.09/026). – Santa Cruz: 39272; 13 1P; transect from Caseta south to coast, 70 m, Quadrat A-2, 23.VIII.1970, leg. W. G. Reeder. – 39290; 1♀; transect from Caseta south to coast, 70 m, Quadrat A-4, 23.VIII.1970, leg. W. G. Reeder. – 39292; 1♀; transect from Caseta south to coast, 60 m, Quadrat B-3, 23.VIII.1970, leg. W. G. Reeder. – 34100; 2♀ 1D; transect from Caseta south to coast, 60 m, Quadrat B-3, 23.III.1970, leg. W. G. Reeder. – 39285; 1♀; transect from Caseta south to coast, 60 m, Quadrat A-4, 23.VIII.1970, leg. W. G. Reeder. – 34101; 1♀; transect from Caseta south to coast, 40 m, Quadrat A-2, 24.VIII.1970, leg. W. G. Reeder. – 39282; 1♀; transect from Caseta south to coast, 40 m, Quadrat D-3, 24.VIII.1970, leg. W. G. Reeder. – 34098; 13; transect from Caseta south to coast, 30 m, Quadrat C-4, 24.VIII.1970, leg. W. G. Reeder. – 39270; 1T; transect from Caseta south to coast, 30 m, Quadrat D-3, 24.VIII.1970, leg. W. G. Reeder. – 39275; 1♀; transect from Caseta south to coast, 30 m, Quadrat A-4, 24.VIII.1970, leg. W. G. Reeder. – 39288; 1♀ 1T; transect from Caseta south to coast, Quadrat E-2, 24.VIII.1970, leg. W. G. Reeder. – RBINS; 3♀; CerroColorado, 25.V.1975, leg. H. Franz (SA-292). – 1P; near Puntudo, 730 m, underfernsinlitter, 7.II.1985, leg. H. & I. Schatz (85-55). – 1P; CerroCrocker, 860 m, Fern Sedge zone, under Pteridium aquilinum ssp. arachnoideum View in CoL , fern litter and pieces of wood, 7.II.1985, leg. H. & I. Schatz (85-113). – 13; LosGemelos, 3 kmNSantaRosa, 570 m, Scalesia View in CoL forestlitter, 13.VI.1985, leg. S. & J. Peck (85-188a). – 13; northside, 1 kmECal. TortugaNegra, soilwashing, upperbeach, 2.IV.1989, leg. S. Peck (89-189). – 1P; PuertoAyora, TortugaBay, brackishlitterundermanchineel, 0.5 m, 29.VI.1991, leg. S. Peck (91-258). – 43 3♀ 3T 1D; south-east, PuntaRocafuerte, aridcoast, Cordia View in CoL litter, 7.V.1992, leg. S. Peck (92-161). – RBINS; 2♀; CDRS, littoralzone, Sesuvium, 1-2 m, 28.II.1982, leg. L. Baert & J.-P. Maelfait (B28.2.2). – RBINS; 1♀; roadtoItabaca, bush, 23.I.2010, leg. F. Hendrickx & W. Dekoninck (FH10/019). – Santa Fé: 39263; 23 13; 400 m SSW of Camp Bay, 40-50 m, screened from litter of Scalesia helleri View in CoL and Cordia lutea View in CoL , blocky talus, base first barranco, 23.I.1979, leg. W. G. Reeder. – 39273; 1♀; rock outcrops of second barranco, 1 km SSW of Camp Bay, 100 m, litter of Cordia View in CoL and Croton View in CoL , sheltered but very dry, 24.I.1979, leg. W. G. Reeder. – 39260; 1♀; 1.75 km SSW of Camp Bay, 130 m, from Oryzomys nest of Opuntia View in CoL fibers underdowned Opuntia View in CoL trunk, Bursera View in CoL area, 25.I.1979, leg. W. G. Reeder. – MHNG/RBINS; 13 1D; littoralsoilwashunder Cryptocarpus, 5.IV.1989, leg. S. Peck (89-203). – RBINS; 1♀ 1D; alt. 30 m, Scalesia View in CoL litter, 5.IV.1989, leg. S. Peck (89-209). – CDRS; 1♀; sectortouristico, bajo rocas, XI.1990, leg. S. Abedrabbo. – Santiago: RBINS; 13 1♀; highland, 800 m, 6.III.1986, leg. L. Baert, J.-P. Maelfait & K. Desender (B086/063). – Seymour: MHNG/RBINS; 1♀ 2T; 15 m, litterunderbushesinfrigatebirdrookery, 23.I.1989, leg. S. Peck (89-18). – RBINS/ MHNG; 13 5T 1D; SWend, litterunderlittoralshrubs, 1 m, 23.I.1989, leg. S. Peck (89-20). – SouthPlazas: 39271; 13; undersurfacelava, 4.III.1970, leg. W. G. Reeder. – 39365; 1T; alt. 2-3 m, under lava stones just above high tide line, below Sesuvium, west end of island, heavy use by sea lions; 28.V.1975, leg. W. G. Reeder. – 39262; 33 3♀; 10-12 m, screening of damp litter under Opuntia View in CoL pad and rotting Opuntia View in CoL stump base, 19.III.1975, leg. W. G. Reeder. – 39278; 13; 12-15 m, understonesoflavagravel-sandsubstrate, nolitter, 19.III.1975, leg. W. G. Reeder. – MHNG; 93 3♀ 1T 1D 1P; arid shrubs and succulent litter, 6.V.1992, leg. S. Peck (92-162).

SHORT DESCRIPTION: Chaetotaxy of carapace and tergites as indicated by Beier (1978), without variation. Sternites of 3: VI with 4-6 median glandular setae (more or lessinsemi-circulararrangement), VII 4-5 (semi-circulararrangement), VIII 2-3. Chelicera: rallum with 4 setae, distal one dentate on anterior margin, serrula exterior with 16-18 lamellae (1♀ with 20, only left chelicerae studied). Pedipalps of 3 (♀): femur 2.9-3.2 (2.8-3.4) times, patella 2.2-2.5 (2.1-2.6) times, handwithpedicel 1.8-2.1 (1.7-2.1) times, chelawithpedicel 3.1-3.6 (3.1-3.4) times, withoutpedicel 2.8-3.3 (2.8- 3.1) times longer than broad, finger in 3♀ 1.2-1.4 times longer than hand with pedicel. Fixed finger (3♀) with 24-30 teeth, movable finger (3♀) with 18-23 teeth; venom ducts very short. Trichobothria: st of movable finger normally above sb, in one 3 on left side distinctly distal of sb; trichobothrial pattern of 3, trito- and deutonymph as in Fig. 43 a-d. LegI: telotarsus 1.4-1.8 (frequently 1.5-1.6) timeslongerthanbasitarsus; legIVof 3 (♀): femur+patella 2.4-2.7 (2.6-3.1) times, tibia 3.1-3.6 (2.9-4.0) times, basitarsus 1.6-1.8 (1.6-2.2) times, telotarsus 2.4-2.7 (2.2-3.0) timeslongerthandeep; chaetotaxy of basitarsus: TS+1/1/1 (paired). Arolia divided in distal half, much longer than claws.

MEASUREMENTS of 163 (11♀)(specimens from most of the islands): Total length 2.16-2.84 (2.33-3.98). Carapace 0.53-0.68 (sclerotizedpart)/0.34-0.42 (0.59- 0.82/0.35-0.45). Pedipalps: femur 0.41-0.51/0.14-0.16 (0.48-0.62/0.16-0.20), patella 0.41-0.51/0.18-0.23 (0.48-0.61/0.20-0.26), hand with pedicel 0.44-0.56/0.22-0.29 (0.52-0.67/0.28-0.33), lengthoffinger 0.34-0.43 (0.40-0.47), ofchelawithpedicel 0.77-0.93 (0.89-1.12). LegIV: femur+patella 0.41-0.49/0.16-0.19 (0.47-0.63/0.17- 0.23), tibia 0.29-0.36/0.08-0.11 (0.33-0.43/0.10-0.15), basitarsus 0.09-0.10/0.05-0.06 (0.10-0.14/0.06-0.07), telotarsus 0.12-0.13/0.04-0.05 (0.12-0.16/0.05-0.06).

REMARKS: The specimens from the island of Pinta (NHMW 22819, 13 1♀ examined), identified by Beier (1978) as S. pusillimus , belong without doubt to S. galapagoensis ; Beier's statements on their tergal chaetotaxy (tergite I and II with 4 setae, III-IX with 6 marginal setae) are due to a mistake: chaetotaxy of tergites I-VI of both specimens is 4-4-4-4-4-6. Serianus galapagoensis is one of the most common species on the archipelago, being present on most of the sampled islands. It occurs from the littoral zone up to an altitude of 860 m, in moist to arid habitats, mostly in litter, but was also collected in flying insect traps and in nests of various bird species which probably facilitate its dispersal within the archipelago.

Nymphal stages of Serianus galapagoensis (and other Serianus species) and of the widely distributed Galapagodinus franzi may be differenciated as follows: tritonymphs are separated by presence/absence of trichobothrium est; deutonymphs are clearly separated by the trichobothrial pattern (6+2 trichobothria on chelal fingers in S. galapagoensis , 5+ 1 in G. franzi ), and also in the shape of the galea (apical fork and lateral branch much longer in G. franzi than in S. galapagoensis ); protonymphs can be separated by the shape of the galea.

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Pseudoscorpiones

Family

Chernetidae

Genus

Serianus

Loc

Serianus galapagoensis Beier, 1978

Mahnert, Volker 2014
2014
Loc

Serianus galapagoensis

BEIER, M. 1978: 538
1978
Loc

Serianus pusillimus

BEIER, M. 1978: 536
1978
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