Oreo, PLATNICK, 2002

PLATNICK, NORMAN I., 2002, A Revision Of The Australasian Ground Spiders Of The Families Ammoxenidae, Cithaeronidae, Gallieniellidae, And Trochanteriidae (Araneae: Gnaphosoidea), Bulletin of the American Museum of Natural History 2002 (271), pp. 1-1 : 1-

Oreo , new genus

TYPE SPECIES: Oreo renmark , new species.

ETYMOLOGY: The generic name is taken from that of a black and white cookie, refers to the black and white abdominal coloration pattern found in the type species and many

other gallieniellids, and is considered masculine in gender.

DIAGNOSIS: Males differ from those of Meedo by having some leg spines, from those of Peeto by lacking cheliceral teeth, and from those of Neato by having a distally thin embolus, the tip of which rests in a heavily sclerotized conductor (figs. 121, 125); females can be recognized by the small, rectangular anterior epigynal atrium and by the bipartite spermathecae (figs. 123, 124).

DESCRIPTION: Small spiders, total length of males and females 2.9–3.4. Carapace rugose, without tubercles, with sparsely scattered, short, erect, dark setae and longer, erect setae on clypeus; thoracic groove long, longitudinal, not expanded anteriorly. Eight eyes in two rows, anterior medians smallest, circular, dark, posterior medians irregularly rectangular, flattened, laterals subequal in size, oval; from above, anterior row almost straight, posterior row straight, from front, both rows procurved; anterior medians separated by about their radius, about as far from anterior laterals; posterior medians separated by much more than their diameter, separated by more than their diameter from posterior laterals; anterior and posterior laterals separated by about their diameter; median ocular quadrangle wider in back than in front and than long. Chelicerae porrect, anterior surface with few scattered, strong setae; chilum unipartite, triangular, fused to clypeus, accompanied by second, elongated, posterior chilum (extremely narrow, I­shaped sclerite separating bases of chelicerae posteriorly); chelicerae with distinct lateral boss, promargin with series of short setae originating in line along base of fang plus one longer seta originating near base of fang, extending far from base before bending toward midline; promargin and retromargin of fang furrow toothless. Labium wide, very short, extending only about one­fourth length of endites, bipartite, posterior portion short, flat, anterior portion steeply inclined; posterolateral corners heavily sclerotized, anterior margin invaginated at middle. Endites with weak oblique depression, without median groove, serrula present, apex bearing narrow patch of long, stiff, dark setae. Sternum flat, with weak lateral margins, not expanded anteri­ orly, with slight extensions between coxae I– III; surface smooth, with few long setae. One weakly sclerotized epimeric sclerite on each side, with heavily sclerotized triangles above coxae I–III but not extending between them, not fused to carapace. Pedicel composed of two narrow dorsal sclerites and weak, inverted v­shaped ventral sclerite, reaching almost to posterior tip of sternum.

Abdomen without dorsal scutum; cuticle with weak, recumbent setae; epigastric scutum weakly sclerotized, that of males with posteriorly produced margin at middle, with very narrow spiracles at sides, without postepigastric sclerites; colulus represented by setae; posterior spiracle wide, anterior of colular setae. Anterior lateral spinnerets small, widely separated at base, with two articles; posterior median spinnerets of males cylindrical, of females triangular, posterior portion with about three large cylindrical gland spigots; posterior lateral spinnerets with two articles, those of females with at least one large cylindrical gland spigot.

Leg formula 4123; leg spination greatly reduced, typical leg spination pattern (only surface bearing spines listed): tibiae III, IV p0­0­1, v2­2­0, r0­1­1; metatarsi III p0­1­1, v2­0­1p, r0­1­1; IV p1­1­0, v1p­0­1p, r1­2­ 0; most surfaces with normal, long setae; coxae and trochanters without dorsal tubercles; anterior coxae without protuberant posterolateral corners; trochanters unnotched, relatively long; metatarsi and tarsi I, II with weak, undivided scopulae; posterior metatarsi without distal preening brushes; tarsi with two basally dentate claws, no claw tufts; tarsi I–IV of both sexes sometimes with cuticular cracks at about two­thirds of their length, cracking occupying more of segment on tarsi III, IV; trichobothria present, in two rows on tarsi and tibiae, single row on metatarsi. Female palpal tibia with weak dorsal spines; female palpal tarsus with thick dentate claw and ventral brush of long, stiff setae.

Male palp with one or two pronglike retrolateral tibial apophyses; cymbial surface excavated at base, opposite tibial apophysis; tegulum rounded, with retrolaterally originating, threadlike embolus, prolaterally situated, elaborate conductor, median apophysis membranous. External epigynum with narrow, anteriorly situated atrium; spermathecae compact, crenulate, with lobate anterolateral extensions.