Tetragnatha didorata, Castanheira & Baptista & Oliveira, 2022

Castanheira, Pedro de Souza, Baptista, Renner Luiz Cerqueira & Oliveira, Francisca Samia Martins, 2022, Five new species of the long-jawed orb-weaving spider genus Tetragnatha (Araneae, Tetragnathidae) in South America, with a key to the species from Argentina and Brazil, Evolutionary Systematics 6 (2), pp. 175-210 : 175

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Tetragnatha didorata

sp. nov.

Tetragnatha didorata sp. nov.

Figs 10 View Figure 10 , 19 View Figure 19


Holotype male, Torres (29°20'06.0"S, 49°43'37.0"W, Rio Grande do Sul, Brazil), 26.iii.2006, ELC da-Silva leg. (MCTP 43335). Paratypes: Brazil - Pará • 1 male, Belém, Reserva Mocambo, 01°26'28.7"S, 48°24'46.2"W, 05.v.2008, BVB Rodrigues leg. (MPEG.ARA 031362); Paraná • 1 male, Cambará, 23°02'45.0"S, 50°04'26.0"W, iv.2011, AM Giroti leg. (IBSP 167755); Santa Catarina • 1 male, Lebon Régis, 26°55'44.0"S, 50°41'42.0"W, 15.vii.2006, R. Lignau leg. (MCTP 19580).


Males of Tetragnatha didorata sp. nov. resembles T. tenuissima and T. amazonica sp. nov. considering the elongated slender abdomen; T. bogotensis considering cheliceral morphology as both share long and straight ‘t’, and T. renatoi sp. nov. considering their pedipalp morphology with large subquadrate paracymbium (Fig. 6A-C View Figure 6 , 10A-F, J, K View Figure 10 , Castanheira et al. 2019, figs 1C, E, F, 3C, Castanheira and Baptista 2020, figs 4I, 6F, 12A, B). Tetragnatha didorata sp. nov. differs from T. tenuissima and T. amazonica sp. nov. by the presence of a projection after the spinnerets (Figs 10B, C View Figure 10 ), from T. bogotensis by ‘a’ not slanted and carved on its lower portion, absence of AXu, the more elongated and sclerotized ‘t’, Gu and L2 smaller, absent AXl and much smaller teeth on lower row (Figs 10D-G View Figure 10 ), and from T. renatoi sp. nov. by the narrower translucent lobe, larger notch and larger knob (Fig. 10J, K View Figure 10 ).


Male (holotype MCTP 43335): Carapace elongated, slightly elevated anteriorly and with orange hue (Fig. 10A, B View Figure 10 ). Labium longer than wide and yellowish brown (Fig. 10C View Figure 10 ). Sternum oval and yellowish brown, with no marks or contour (Fig. 10C View Figure 10 ). Eyes with ALE and PLE almost touching (Fig. 10A View Figure 10 ). Legs very elongated, with yellowish hue, with legs I and II slightly darker (Fig. 10A-C View Figure 10 ). Chelicera paturon very elongated, approximately 4.95 × longer than wide and as long as carapace, slightly curved outwards, around 25° from body median line, moderately thick and yellowish brown (Fig. 10A, D-G View Figure 10 ). ‘a’ elongated, thin, straight distalward projected and constricted on inner margin of its tip, located close to fang groove on centre of paturon (Fig. 10D-G View Figure 10 ). AXu absent (Fig. 10D, E View Figure 10 ). ‘t’ bulky, sclerotized, pointed and straight, forming the letter “L” with the apophysis (Fig. 10D, E View Figure 10 ). Upper row with eight teeth (Fig. 10D, E View Figure 10 ): Gu small, sclerotized and slightly distalward projected, located on a dark ridge apart from fang groove by large gap; U2-U7 of similar size, pointed and straight, U2-U3 apart by a large gap and remaining teeth apart from one another by small gaps. AXl absent (Fig. 10E, F View Figure 10 ). Lower row with nine teeth distalward projected (Fig. 10E, F View Figure 10 ): Gl small, triangular, pointed and sclerotized, located on fang groove and apart from L2 by very large gap; L2-L4 pointed and decreasing in size, apart by large gaps; L5-L9 extremely reduced in size, L7-L9 reduced to denticles. Cheliceral fang not thick, uniformly tapering to its tip and closing between teeth rows (Fig. 10D-F View Figure 10 ). Abdomen slender, approximately 2.7 × longer than carapace, with a pointed end projection posterior to the spinnerets, pale yellow and completely covered by guanine crystals, with no lateral bands (Fig. 10A-C View Figure 10 ). Pedipalps with elongated cymbium, only around 1.2 × longer than long and rounded tibia, medially bending outwards, bearing wide basis and with no apical constriction (Fig. 10H, I View Figure 10 ); tegulum about 1.4 × wider than long and inflated (Fig. 10H View Figure 10 ); conductor elongated, distally projected and completely enfolding the embolus from its middle portion as a pouch, ending in rounded and twisted tip (Fig. 10H, I View Figure 10 ); embolus thick, filiform, sclerotized and twisted from mid-way, opening from below the conductor (Fig. 10H, I View Figure 10 ); paracymbium very long, around 3.3 × longer than wide, subquadrate, bearing transparent lobe that occupies around 50% of paracymbium width, notch carved and rounded, and knob enlarged and mushroom-like (Fig. 10J, K View Figure 10 ).

Measurements. Total length 9.0. Carapace 2.5 long, 1.4 wide. Abdomen 6.6 long, 1.0 wide. Left chelicera 2.4 long, 0.6 wide. Leg formula I-II-IV-III. Leg I: femur 7.1, patella 0.9, tibia 6.8, metatarsus 7.5 and tarsus 1.6. Leg II: patella + tibia 4.4. Leg III: patella + tibia 1.7. Leg IV: patella + tibia 4.9.

Female. Unknown.


The specific epithet " Tetragnatha didorata " is the compound latinized form of the Greek words: “di” meaning “two” and "dory, dorata" meaning “spear”, referring to the spear-like shape of the thin and long apophysis and the elongated and pointed ‘t’ at the upper side of the male chelicerae.


Males (n = 3): total length, 7.0 - 9.0. Little variation in colour pattern.


This species is mainly found at Paraná, Santa Catarina and Rio Grande do Sul, in the South region, but it was also collected in Pará state, in the North region, all in Brazil (Fig. 19 View Figure 19 ).

Life history and habitat preferences.

All specimens of T. didorata sp. nov. were collected during the autumn (late March, April and May) and the beginning of winter (July). No information on habitat preferences was given on the original labels of this species.