Oxyopomyrmex magnus, Sebastian Salata & Lech Borowiec, 2015

Sebastian Salata & Lech Borowiec, 2015, A taxonomic revision of the genus Oxyopomyrmex André, 1881 (Hymenoptera: Formicidae), Zootaxa 4025 (1), pp. 1-66 : 25-31

Oxyopomyrmex magnus sp. nov.

( Figs. 22, 23, 24, 25, 26, 27, 28, 29, 30, 77)

Etymology. Named for the large size of this species (lat. magnus = large).

Type locality: Aranjuez n. Madrid, Spain .

Type material. Holotype worker (top on the pin): SPAIN | Aranjuez | 22.V. 77 | p. Acosta ( BMNH) ; 2 paratype workers: the same data as holotype ( BMNH) .; 3 paratype workers: Aranjuez (M.) | Ł- 27 ’ | 15 - 5-77 M- 977 | F. Acosta (coll) ( WML) ; 2 paratype workers: Aranjuez (M.) | 21 - 5-77 M- 1727 | F. Acosta ( DBET, SSC) ; 1 paratype gyne: Aranjuez (M.) | 21 - 5-77 M- 1727 | F. Acosta ( DBET) .

Other material examined. 1 male—SPAIN | Albacete | Sierra da Alcaraz | 11.IV. 1989 | X. Espadaler || BMNNH-041989 ( BMNH) ; 2 male—SPAIN | Albacete | Sierra da Alcaraz | 11.IV. 1989 | X. Espadaler ( BMNH) ; 4 workers—SPAIN | Albacete | Sierra da Alcaraz | 11.IV. 1989 | X. Espadaler ( BMNH) ; 2 gyne—SPAIN | Albacete | Sierra da Alcaraz | 11.IV. 1989 | X. Espadaler ( BMNH) .

Gyne. Description. Measurements (n= 3): HL: 0.825 ± 0.007 (0.816-0.832); HW: 0.866 ± 0.005 (0.86-0.872); SL: 0.534 ± 0.002 (0.531-0.536); EL: 0.296 ± 0.004 (0.291-0.302); EW: 0.168 ± 0.001 (0.167-0.17); ML: 1.385 ± 0.013 (1.367-1.396); MH: 0.867 ± 0.008 (0.86-0.879); PSL: 0.283 ± 0.009 (0.274-0.296); SDL: 0.188 ± 0.002 (0.184-0.19); PL: 0.492 ± 0.004 (0.486-0.497); PPL: 0.365 ± 0.04 (0.335-0.425); PH: 0.335 ± 0.016 (0313- 0.352); PPH: 0.343 ± 0.014 (0.324-0.358); PNW: 0.696 ± 0.021 (0.681-0.726); TL: 0.615; TW: 0.134; PW: 0.246-0.257; PPW: 0.366-0.38; HI: 105.0 ± 0.7 (104.0- 105.6); SI 1: 64.8 ± 0.6 (64.3-65.7); EI: 56.8 ± 1.3 (55.3-58.4); SI 2: 61.7 ± 0.6 (60.9-62.3); MI: 199.1 ± 5.1 (192.3-204.6); SPI: 150.5 ± 4.8 (144.2-155.8); PI 1: 147.0 ± 8.7 (138.1-158.8); PI 2: 35.4-36.1; PPI 1: 106.6 ± 12.2 (93.6-122.8); PPI 2: 52.3-53.7; HTI 1: 70.5; HTI 2: 21.8.

Head and thorax dark brown to brown. Abdomen brown. Antennal scapes brown to pale brown, funiculus pale brown. Mandibles dark brown to pale brown. Femora brown to pale brown, tibiae pale brown to yellowish brown, tarsi yellowish brown ( Figs. 22, 23, 24).

Head quadrate, wider than long, lateral surfaces below eyes straight gently rounded on the posterior edges ( Fig. 24). Anterior margin of the clypeus straight. Eyes longitudinal, strongly narrowing downward, reaching anteroventral margin of head, 0.4 times as long as length of the head. Ocelli large. Scape short, 0.6 times as long as width of the head, at base 0.4 times as wide as in apex then gradually widened without preapical constriction. Funiculus short, 1.6 times as long as scape, first segment elongate, triangular, 1.9 times as long as wide on apex, 3.25 times as long as second segment, length ratio of segments 100: 31: 35: 38: 38: 46: 52: 81: 77: 154, apical segments 1.6 times as wide as basal segments ( Figs. 23, 24). Surface of the scape with very fine microsculpture, shiny, covered with short, dense, semierect setae.

Mesosoma 1.7 times as long as head, relatively high and robust, flat with rounded pronotal corners in profile. Scutum 1.0 times as wide as long, posterior margin regularly semicircular. Propodeum located considerably lower than mesosomal plate, propodeal spines big, triangular rising obliquely upwards. Petiole sharply rounded with long peduncle, its anterior face concave, node sharply rounded on dorsal surface, posterior face slightly concave. Ventral margin of petiole straight without lobe. Postpetiole in profile regularly rounded. Postpetiole 0.9 times as long as wide in dorsal view, regularly widened from base to top, apical half with gently rounded sides ( Figs. 22, 23).

Mandibles rounded with distinct longitudinally striation, shiny, inner margin with 7-8 teeth, the apical tooth massive and long. Clypeus with longitudinal striae, shiny. Frontal carinae short, extending to 1 / 3 length of eye; antennal fossa deeply impressed, rugulose with striation, frontal lobes rugulose with thick longitudinal striae, shiny between rugosities. Frons shiny, all surface with thick longitudinal striae and rugulose. Area above eyes with striation and rugulose. Ventral surface of the head with striation and finely rugulose, gena shiny, with longitudinal striae ( Figs. 23, 24). Entire head bearing setae, posterior margin with dense, semierect to erect setae directed forward, lateral surfaces of the head with dense semierect setae directed toward anterior margin, frontal area with dense, semierect setae placed transversely, directed to the center of the head, ventral surface of the head with a prominent psammophore and appressed to erect long setae. Sides of the pronotum, anepisternum, katepisternum, metanepisternum and metakatepisternum microreticulate with distinct sparse longitudinal striae, shiny between striae. Scutum on anterior half rugose with smooth longitudinal stripe in central part, posterior part of the scutum with longitudinal striae, rugulose. Scutellum smooth, shiny microreticulate, only outer surface with a few longitudinal striae. Metanotum punctate to rugose and dull ( Figs. 22, 23). Propodeum with distinct longitudinal and transverse striation on lateral surfaces, shiny and smooth between striae, area between propodeal spines shiny and micropunctate. Dorsal suface of propodeum rugulose to transversely striate, between and below the spines smooth and shiny. Dorsal suface of mesosoma with dense, semierect to erect, long setae on anterior half, anterior propodeum with a few long setae ( Figs. 22, 23). Base of petiole and postpetiole on the entire surface punctate to rugulose, nodes of the petiole punctate on the top and lateral surfaces, postpetiole node rugulose, microrugulose with fine longitudinal striae on the top, shiny. Gaster shiny with sparse microreticulation, bearing dense, long, semierect to erect setae.

Legs short, hind femora 0.5 times as long as mesosoma length, hind tibia 0.9 times as long as hind femora, hind tarsi 1.6 times as long as hind femora. Dorsal surface of femora with short, sparse, semierect setae, inner margin with a row of dense, long, semierect setae, tibiae bearing long, semierect setae on the entire surface, inner margins with a row of semierect setae ( Fig. 23).

Male. Description. Measurements (n= 3): HL: 0.518 ± 0.003 (0.514-0.52); HW: 0.499 ± 0.007 (0.492-0.508); SL: 0.317 ± 0.005 (0.313-0.324); EL: 0.212-0.223; EW: 0.173-0.179; ML: 1.23 ± 0.016 (1.213-1.252); MH: 0.781 ± 0.023 (0.761-0.813);PSL: 0.158 ± 0.007 (0.151-0.168); SDL: 0.165 ± 0.009 (0.156-0.178); PL: 0.374 ± 0.02 (0.357-0.402); PPL: 0.261 ± 0.019 (0.235-0.279); PH: 0.19-0.218; PPH: 0.205 ± 0.014 (0.19-0.223); PNW: 0.769 ± 0.019 (0.748-0.793); TL: 0.674 ± 0.005 (0.67-0.681); TW: 0.089 ± 0.00 (0.089 - 0.089); PW: 0.207-0.212; PPW: 0.291-0.302; HI: 96.3 ± 1.3 (94.6-97.7); SI 1: 61.1 ± 0.9 (60.2-62.3); EI: 77.6-84.4; SI 2: 63.5 ± 1.8 (61.6-65.9); MI: 160.1 ± 4.0 (154.6-163.7); SPI: 95.8 ± 1.0 (94.4-96.8); PI 1: 184.4-191.1; PI 2: 26.7-27.1; PPI 1: 127.7 ± 10.0 (116.9 -141.0); PPI 2: 36.7-39.5; HTI 1: 135.0 ± 0.9 (134.1-136.2); HTI 2: 13.2 ± 0.1 (13.1-13.3).

Head and thorax dark brown to brown. Abdomen brown. Antennal scapes brown to pale brown, funiculus pale brown to yellowish brown. Mandibles dark brown to pale brown. Femora brown to pale brown, tibiae pale brown to yellowish brown, tarsi yellowish brown ( Figs. 25, 26, 27).

Head oval, longer than wide, lateral surfaces below eyes straight, rounded on the posterior edges ( Fig. 27). Anterior margin of the clypeus straight. Eyes oval, 0.4 times as long as length of the head. Ocelli large. Antenna with 12 segments. Scape short, 12 segmented, 0.6 times as long as width of the head, at base 0.8 times as wide as in apex then gradually widened without preapical constriction. Funiculus short, 3.2 times as long as scape, first segment elongate, triangular, 0.7 times as long as wide on apex, 1.3 times as long as second segment, length ratio of segments 100: 75: 63: 63: 69: 69: 75: 88: 113: 113: 238, apical segments 1.5 times as wide as basal segments ( Figs. 26, 27). Surface of the scape with a very fine microsculpture, shiny, covered with long, dense, erect setae.

Mesosoma 2.4 times as long as head, relatively high and robust, very feeble convex with rounded pronotal corners in profile view. Scutum 1.0 times as wide as long, posterior margin regularly semicircular. Propodeum located considerably lower than mesosomal plate, propodeal spines absent or form minute nodes. Petiole slightly rounded with long peduncle, its anterior face straight, node slightly rounded on dorsal surface, posterior face straight. Ventral margin of petiole straight without lobe. Postpetiole regularly rounded in profile. Postpetiole 1.2 times as long as wide in dorsal view, regularly widened from base to top, apical half with gently rounded sides ( Figs. 25, 26).

Mandibles rounded with distinct longitudinal striae, shiny, inner margin with 4-5 teeth, the apical tooth massive and long. Clypeus rugulose, shiny. Frontal carinae curved outward to merge with the rugae surrounding antennal sockets; antennal fossa deeply impressed, shiny with striation, frontal lobes rugulose with longitudinal striae, shiny between rugosities. Frons and area above the eyes shiny, all surface rugulose with longitudinal striae. Ventral surface of the head with striation and finely rugulose, gena shiny, rugulose ( Fig. 27). Entire head bearing setae, posterior margin with dense, very long semierect to erect setae directed forward, lateral surfaces of the head with dense, long, semierect setae directed toward anterior margin, frontal area with dense, semierect to erect setae placed transversely, directed to the center of the head, ventral surface of the head with a prominent psammophore and appressed to erect long setae. Sides of the pronotum rugulose with thin longitudinal striae, anepisternum smooth and shiny with rugosity and striation at the apical edge, katepisternum smooth with microreticulation at the central part, the side and apical edges rugulose with longitudinal striae, metanepisternum and metakatepisternum rugulose with longitudinal distinct striation. Scutum rugose with longitudinal striae except three longitudinal stripes located at the centre and outer edges of the scutum which are smooth and shiny with a few longitudinal striae. Scutellum smooth, shiny at the centre, outer surface rugulose to punctate. Metanotum punctate to rugose and dull ( Figs. 25, 26). Propodeum punctate with longitudinal striae on lateral surfaces, shiny and smooth between striae, area between propodeal spines shiny and smooth and shiny. Dorsal suface of propodeum punctate, smooth and shiny between and below the spines. Dorsal suface of mesosoma with dense, long, erect setae on anterior half, anterior propodeum without setae ( Figs. 25, 26). Base of petiole and postpetiole on the entire surface punctate, nodes of the petiole punctate on lateral surfaces, dorsal surface of the petiole node punctate with a few longitudinal striae, postpetiole node rugulose, micropunctaeon the top, shiny. Gaster shiny with microreticulation, bearing dense, long, semierect to erect setae.

Legs short, hind femora 0.7 times as long as mesosoma length, hind tibia 0.9 times as long as hind femora, hind tarsi 1.6 times as long as hind femora. Dorsal surface of femora with several, short, semierect setae, inner margin with a row of the sparse, long, semierect setae, tibiae covered with long, semierect setae on the entire surface, inner margins with a row of semierect setae ( Fig. 26).

Worker. Description. Measurements (n= 12): HL: 0.719 ± 0.032 (0.682-0.788); HW: 0.736 ± 0.034 (0.693- 0.802); SL: 0.507 ± 0.017 (0.475-0.536); EL: 0.254 ± 0.004 (0.246-0.257); EW: 0.136 ± 0.004 (0.131-0.145); ML: 0.901 ± 0.045 (0.844-0.988); PSL: 0.192 ± 0.013 (0.179-0.218); SDL: 0.125 ± 0.007 (0.112-0.14); PL: 0.349 ± 0.02 (0.318-0.38); PPL: 0.254 ± 0.022 (0.229-0.291); PH: 0.25 ± 0.015 (0.235-0.279); PPH: 0.234 ± 0.002 (0.201- 0.265); PNW: 0.482 ± 0.025 (0.441-0.525); TL: 0.517 ± 0.014 (0.497-0.536); TW: 0.115 ± 0.008 (0.101-0.123); PW: 0.192 ± 0.017 (0.165-0.223); PPW: 0.261 ± 0.02 (0.234-0.296); HI: 101.9 ± 1.2 (100.4-104.6); SI 1: 70.5 ± 2.0 (66.7 -73.0); EI: 53.6 ± 1.6 (51.0- 56.4); SI 2: 69.3 ± 2.2 (65.5-72.5); MI: 188.4 ± 2.2 (185.7-191.5); SPI: 153.2 ± 6.4 (145.5-163.4); PI 1: 140.0 ± 6.1 (134.6-149.6); PI 2: 39.8 ± 1.7 (37.4-42.5); PPI 1: 108.7 ± 7.3 (99.2 -117.0); PPI 2: 54.3 ± 3.8 (49.0- 60.9); HTI 1: 70.9 ± 1.1 (69.5 -73.0); HTI 2: 22.2 ± 1.5 (19.6-24.5).

Head, thorax and abdomen from dark brown to brown. Antennal scapes pale brown, apex of the scapes and funiculus yellowish-brown. Mandibles dark brown to pale brown. Femora pale brown, tibiae and tarsi brown to yellowish brown ( Figs. 28, 29, 30).

Head rectangular, wider than long, lateral surfaces below eyes straight, gently rounded on the posterior edges ( Fig. 30). Anterior margin of the clypeus smooth and straight. Eyes longitudinal, strongly narrowing downward, reaching anteroventral margin of head, 0.4 times as long as length of the head. Scape short, 0.7 times as long as width of the head, at base 0.4 times as wide as in apex, gradually widened, slightly bent downward. Funiculus short, 1.5 times as long as scape, first segment elongate, triangular, 1.9 times as long as wide on apex, 2.6 times as long as second segment, length ratio of segments 100: 38: 33: 33: 42 :: 42: 54: 75: 83: 166, apical segments 1.8 times as wide as basal segments ( Figs. 29, 30). Surface of the scape with very fine microsculpture, shiny, covered with short, dense and semierect setae.

Promesonotum 1.1 times as long as wide, slightly convex in profile. Promesonotal suture distinct, border between dorsal and posterior surfaces of the promesonotum gently curved in profile view. Propodeum quadrate, 0.9 times as long as wide, propodeal spines massive, triangular, rising obliquely upwards ( Fig. 29). Petiole rounded with short peduncle, its anterior face straight, node flat on dorsal surface in profile. Posterior face slightly domed. Ventral margin of petiole with ventral lobe ( Fig. 29). Postpetiole regularly rounded in profile. Postpetiole 0.9 times as long as wide in dorsal view, regularly widened from base to top, apical half with gently rounded sides ( Fig. 29).

Mandibles rounded, with outer and dorsal edges straight and smooth, inner margin with 7-8 teeth, the apical tooth massive and long. Clypeus smooth and shiny on entire surface. Frontal carinae short, extending to upper edge of antennal fossa; antennal fossa deeply impressed with rounded striation, frontal lobes with thick longitudinal striae, area between striation shiny. Frons shiny, all surface with thick longitudinal striae and rugulose in central part to rugulose toward eyes. Area above eyes shiny, rugulose with thinner longitudinal striae. Ventral surface of the head with distinct striation and rugulose, gena shiny with longitudinal striae and rugosity ( Figs. 29, 30). Entire head bearing semierect setae, posterior margin with sparse erect setae directed forward, lateral surfaces of the head with setae directed toward anterior margin, frontal area with dense semierect setae placed transversely, directed to the center of the head, ventral surface of the head with a prominent psammophore and appressed to erect long setae. Pronotum shiny, rugose with longitudinal striae, lateral surfaces finely rugulose with longitudinal striae. Dorsal suface of pronotum rugose, area between rugae shiny, lateral surfaces with longitudinal striae and finely rugulose, shiny. Mesonotum rugose and shiny on the top, lateral surfaces rugose with longitudinal striae, dorsal surface of propodeum with longitudinal striae or rugose, punctate with longitudinal striae and rugose below spiracles ( Figs. 28, 29). Dorsal suface of mesosoma with at least 5 erect setae and several short appressed setae on anterior half, mesonotum and anterior propodeum with a few setae. Base of petiole and postpetiole on the entire surface punctate, nodes punctate, sparse punctation or micropunctae on the top, shiny. Sides punctate with fine longitudinal striae, covered with several setae. Gaster shiny with microreticulation, bearing dense, erect setae.

Legs short, hind femora 0.8 times as long as mesosoma length, hind tibia 0.7 times as long as hind femora, hind tarsi 1.3 times as long as hind femora. Dorsal surface of femora with short, sparse, semierect setae, inner margin with a row of the sparse, long, semierect setae, tibiae bearing long, semierect setae on the entire surface, inner margins with a row of semierect setae ( Fig. 29).

Biological data. Nothing is known about the biology of this species.

Distribution. Spain: mainland.

Differential diagnosis. Gyne. Oxyopomyrmex magnus is the only species with SI> 100 and with the surface between striae on the dorsal and lateral surfaces of the propodeum smooth and shiny, without punctation.

Male. Oxyopomyrmex magnus is distinguished from O. oculatus by the occurrence of the longitudinal striae on dorsal surface of the scutum; from O. insularis by the occurrence of the longitudinal striae at its frons and the vertical striation on dorsal surface of the head; from O. nigripes and O. emeryi by the occurrence of the rugosity between longitudinal striae at the scutellum; from O. saulcyi and O. krueperi by the lack of distinct propodeal spines which in the O. magnus males are nodular or absent.

Worker. Oxyopomyrmex magnus belongs to a species group with HI> 100. In this group, O. magnus is clearly distinguished from O. emeryi by lack of punctation on dorsal surface of the pronotum and with striae covering entire surface of the head; from O. nitidior by the distinct longitudinal striae covering the surface of the head and by the lack of smooth sculpture on the center of the frons.