Ectopsocus disjunctus, Aldrete & Manchola, 2022

Aldrete, Alfonso Neri García & Manchola, Oscar Fernando Saenz, 2022, A new species of Ectopsocus (Psocodea: Psocomorpha: Ectopsocidae), from the Baja California Peninsula and Oaxaca, Mexico, Zootaxa 5134 (4), pp. 593-596 : 593-596

Ectopsocus disjunctus n. sp.

( Figs 1–9 )

Diagnosis. Belonging in species group ornatus of Thornton & Wong (1968). It is close to E. obscurus García Aldrete (1991) from the coast of Jalisco, with which species it shares a similar hypandrium, but differs in the phallosome and radular sclerites. The new species has a diagonal line of sclerotized papillae on each side of the clunium over the area of the epiproct and paraprocts, and one central, rounded hyaline area. In contrast, E. obscurus has a field of sclerotized papillae on each postero-lateral corner of the clunium, and lacks a central rounded hyaline area. The subgenital plates and gonapophyses of both species are similar, but the spermapore sclerites are different.

Male. Color (in 80% ethanol). Body reddish brown. Compound eyes black, ocelli hyaline, with ochre centripetal crescents. Maxillary palps reddish brown. Antennae pale brown. Wings opaque, with a reddish brown hue. Abdomen pale reddish.

Morphology. Hypandrium broad, almost rectangular, setose; posterior border with a setose lobe on each side of the longitudinal midline ( Fig. 4 ). Phallosome ( Fig. 5 ), with side struts short, stout, joined posteriorly with external parameres, these slightly curved, with apices bent outward. Internal parameres forming an arch, posteriorly wide, concave, with postero-lateral corners directed latero-posteriorly. Endophallus without sclerites, with two well defined, mesal, pigmented irregular bodies, and one posterior, arched, spinose body. Male clunium, over the area of the epiproct and paraprocts, posteriorly with a comb of 33-35 short, blunt ended, strongly sclerotized teeth; a rounded, hyaline area in the center, a line of sclerotized papillae on each side, from each postero-lateral corner toward the central hyaline area, or a field of sclerotized papillae on each postero-lateral corner as described in the diagnosis above ( Fig. 6 ). Paraprocts ( Fig. 6 ) ovoid, with outer border sclerotized, bearing one cone and a row of setae, sensory fields with eight trichobothria issuing from basal rosettes, other setae as illustrated. Epiproct ( Fig. 6 ), broadly bell-shaped, setae as illustrated.

Measurements (in microns). FW: 1301, HW: 1062, F: 319, T: 494, t1: 173, t2: 80: ctt1: 10, Mx4: 91, f1: 141, f2: 63, f3: 65, f4: 65, f5: 53, IO: 354, D: 140, d: 76, IO/d: 4.65, PO: 0.54.

Female. Color (in 80% ethanol). Same as in the male.

Morphology. Subgenital plate ( Fig. 9 ) broad, pigmented area widely concave anteriorly, 13-15 macrosetae on posterior transverse row, posterior processes stout, broadly triangular, each with four macrosetae apically. Gonapophyses ( Fig. 7 ): dorsal valves cylindrical, slightly curved, each bearing a row of six macrosetae on outer border. Spermapore sclerite broad, almost straight posteriorly, with a curved “handle” anteriorly. Paraprocts ( Fig. 8 ) semi-elliptic, with half of outer border, next sensory fields, strongly sclerotized; a setal field distally, a transverse row of seven macrosetae, next each sensory field, these with eight trichobothria issuing from basal rosettes. Epiproct ( Fig. 8 ) sinuous anteriorly, with sides converging to a rounded apex, a hyaline, transverse area next posterior border, setae as illustrated.

Measurements (in microns). FW: 1482, HW: 1224, F: 342, T: 514, t1: 169, t2: 78, ctt1: 10, Mx4: 96, f1: 159, f2: 60, f3: 67, f4: 53, f5: 53, IO: 371, D: 138, d: 77, IO/d: 4.81, PO: 0.55.

Type specimens. Holotype male. MEXICO, Oaxaca, South Sierra, 34 km SW Oaxaca City, toward Puerto Escondido , 4.ii.1980, by beating dead hanging leaves of Agave sp. (A. N. García Aldrete) . Paratypes: 1 male, 5 females, same data as the holotype .

Records. MEXICO, Oaxaca, 8 km E La Ventosa junction, 23.viii.1973, 1 male from dead, hanging fronds of fan palm (A. N. García Aldrete). Baja California Sur, Santiago, La Zorra Canyon 200 m, 23.v.1998 1 male by beating dead leaves of Convolvulaceae (A. N. García Aldrete) . The Oaxacan records of E. obscurus , in García Aldrete (1991), in reality refer to E. disjunctus .

Etymology. The specific name refers to the disjunct distribution of this species.

Remarks. E. disjunctus is the first species of its genus known in the Baja California peninsula. The site, at the southern end of the peninsula, suggests that the species might have been there before what would become the Cape of Baja California separated from mainland Mexico, some 12-14 mya. Later on, the northern section of the peninsula separated from the mainland and moved northward, about 7-10 mya, collided with North America, about 6 mya, and about 1 mya the Cape region joined the peninsula, that was united as one landmass, forming the Gulf of California ( Mulcahy & Macey, 2009). Other records for this species are from the Pacific slope of Oaxaca.

Figures

FIGURES 1–6. Ectopsocus disjunctus n. sp. Male: (1) Forewing. (2) Hindwing. (3) Front view of head. (4) Hypandrium. (5) Phallosome. (6) Clunium, paraprocts and epiproct. Scales in mm.

FIGURES 7–9. Ectopsocus disjunctus n. sp. Female: (7) Ends of clunium, gonapophyses and ninth sternum. (8) Clunium, paraprocts and epiproct. (9) Subgenital plate. Scales in mm.