Nediphya Marusik &amp; Omelko 2017, gen. n.
Creators: name: Marusik, Y. M.
name: Omelko, M. M.
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Tetragnathidae
Nediphya

description: <i>Nediphya</i> gen. n. urn:lsid:zoobank.org:act: 55D4DFDB-361F-4E62-AD8F-BB81FDD1FC12 T y p e s p e c i e s. <i>Nediphya lehtineni</i> <b>sp. n</b>. Diagnosis. The new genus differs from all Tetragnathidae by having eyes arranged in 3 rows (figs 12–17). <i>Nediphya</i> gen. n. is most similar to <i>Diphya</i> (figs 9–11) by having heterogeneous eyes, a prolateral row of stiff setae on the tibia-tarsus of legs I–II, and a strong, large dorsal claw-like branch of the paracymbium. New genus can be distinguished by small anterior lateral eyes, not spaced with posterior eyes, low clypeus (less than diameter of AME), <i>vs</i>. ALE equal in size to PLE and PME, lateral eyes widely spaced, clypeus higher than diameter of AME in <i>Diphya</i>. In addition, the cephalic part of the carapace in <i>Nediphya</i> gen. n. is unmodified (fig. 12) (slanted in <i>Diphya</i> (fig. 11)). The two genera can also be distinguished by the shape of the epiandrous plate and the number of fusules (only 2 pairs of fusules located in 2 pits in <i>Nediphya</i> gen. n. (fig. 25) <i>vs</i>. about 2 dozen arranged in a transverse row in <i>Diphya</i> (cf. Marusik &amp; Omelko, 2017)). Males of <i>Nediphya</i> gen. n. can be recognized by having a strongly reduced ventral branch of the paracymbium (large and bilobed in <i>Diphya</i>, fig. 33) and the presence of a cymbial lobe (lacking in <i>Diphya</i> (figs 32– 33)), a filamentous and gradually rounded embolus (broad and twisted in <i>Diphya</i>). Females of two genera can be easily distinguished by the epigyne weakly sclerotized in new genus and well sclerotized in <i>Diphya</i>). D e s c r i p t i o n. Small, male 2.50, females 2.42–3.10; carapace 1.14 long in male, 1.05–1.23 in females. Carapace pear-shaped, rather high (figs 1–2, 6–8, 12–13,15), with pattern composed of lateral or sublateral dark bands. Eyes in 3 rows (figs 12–17), AME in first row, ALE and PME in second, and PLE in third. ALE and AME subequal in size, ALE 1.5–2 times smaller than PME, clypeus small, less than 1 diameter of AME. Sternum shield like (figs 3, 19) with slightly darkened margins. Chelicerae not enlarged, with 3 prolateral and 2–3 retrolateral teeth; distal teeth (<i>Dt</i>) large (fig. 21). Legs with annulations, tibia-tarsus of legs I and II with rows of stiff subdecumbent setae (fig. 18) forming a kind of “catching basket” (figs 6–8). Few macrosetae, 0–5 on each segment. Tarsi pseudosegmented (fig. 24). Coxae IV in male unmodified, lacking stridulatory teeth or ridges. Female palp with straight, untoothed claw (fig. 12). Abdomen patterned, pattern partly composed of white guanine spots in 2 species. Book lung opercula unmodified, lacking stridulatory ridges. Male spinnerets as in fig. 23. Colulus well developed with 4 setae (fig. 23). Epiandrous plate with 2 pits, each pit with pair of fusules. Copulatory organs. Male palp with long femur (6 times longer than wide and about 1.4 times longer than patella + tibia); patella and tibia unmodified; cymbium almost round with retrolateral hollow (<i>Rh</i>), small antero-retrolateral lobe (<i>Cl</i>) connected by shallow fold (<i>Cf</i>) to paracymbium; paracymbium composed of small lateral branch (<i>Pl</i>) and large dorsal claw-like branch (<i>Pd</i>); bulb round in ventral view, hemispherical in lateral view, ventral side of bulb flat, almost entirely covered with broad ribbon-like semitransparent conductor (<i>Co</i>); tip of conductor with 3 processes (rounded retrolateral (<i>Cr</i>), sharply pointed prolateral (<i>Cp</i>) and weakly sclerotized median (<i>Cm</i>)); dorso-anterior part of conductor with furrow (<i>Fc</i>); embolus (<i>Em</i>) very long, filamentous, making 1.5 loops (<i>ca</i> 540°), and entirely enclosed by the conductors fold. Epigyne weakly sclerotized, with distinct median plate (<i>Mp</i>), copulatory opening indistinct; copulatory ducts (<i>Cd</i>) visible through integument, subparallel; 1–3 pairs of weakly sclerotized receptacles. R e l a t i o n s h i p s. Although the modified eyes, spination of legs I and II with peculiar stiff setae forming a catching basket, lack of sexual dimorphism, small size and unmodified chelicera in <i>Nediphya</i> gen. n. are similar to these in <i>Diphya</i>, the morphology of the copulatory organs is significantly different between the two genera. Highly heterogeneous eyes are also known in <i>Pinkfloydia</i> Dimitrov et Hormiga, 2011, but in that genus only the PME are strongly enlarged and larger than the lateral eyes. The epiandrous plate in <i>Nediphya</i> (fig. 25) is similar to that in <i>Nanometa</i> (cf. fig. 87E in Álvarez-Padilla &amp; Hormiga (2011)) and <i>Dolichognatha pentagona</i> (Hentz, 1850 (cf. fig. 31G in Álvarez-Padilla &amp; Hormiga (2011)) with 2 isolated pit each bearing 4 fusules. To date, prolateral rows of stiff setae on tibia-metatarsi of legs I and II are well documented in tetragnathids only in <i>Diphya</i> (Tanikawa, 1995; Marusik, 2017, Marusik et al., 2017), but can also be found in <i>Metellina orientalis</i> (Spassky, 1932) and <i>M. kirgisica</i> (Bakhvalov, 1974) (personal data) and in an unidentified genus and species from Papua New Guinea (figs 52–54). The bulb in <i>Nediphya</i> is very similar to those illustrated of “ <i>Orsinome</i> ” <i>sarasini</i> Berland, 1924, Nanometinae sp. and <i>Nanometa</i> sp. illustrated by (Álvarez-Padilla &amp; Hormiga (2011), as well as “ <i>Orsinome</i> ” <i>lagenifera</i> (Urquhart, 1888). Those species are from either Australia, New Zealand or Tasmania and all have a broad conductor hiding the tegulum as in <i>Nediphya lehtineni</i> and a filamentous embolus hidden partly or entirely by the fold of the conductor. In addition, those taxa all possess an anterolateral lobe of the cymbium (= CEMP or cymbial ectomedian process <i>sensu</i> Álvarez- Padilla and Hormiga (2011)) and a cymbial fold between the lobe and the dorsal branch of the paracymbium (= CEBP or cymbial ectobasal process <i>sensu</i> Álvarez-Padilla and Hormiga (2011)). In addition to the similar bulb and cymbium morphology in the four species, they each have a well-developed ventral branch of the paracymbium bearing few setae; in <i>Nediphya lehtineni</i> sp. n. the ventral branch of paracymbium is strongly reduced and lacks setae (figs 35–39). None of these four species has a modified eye pattern. Females of “ <i>Orsinome</i> ” <i>sarasini</i> and <i>Nanometa</i> sp. illustrated by Álvarez- Padilla and Hormiga (2011) have epigynes rather similar to that of <i>Nediphya lehtineni</i> sp. n. The complicated morphology of the copulatory organs reflects the phylogenetic relationships between taxa much better than does somatic morphology and thus we consider that <i>Nediphya</i> gen. n. belongs to Nanometinae Forster &amp; Forster, 1999 sensu Álvarez-Padilla &amp; Hormiga (2011). Nanometinae is currently composed of the monotypic genera <i>Nanometa</i> Simon, 1908 (known from the female only (WSC 2017)) and <i>Pinkfloydia</i> Dimitrov et Hormiga, 2011 (Álvarez-Padilla &amp; Hormiga (2011). Status of <b>Nanometinae</b> Forster &amp; Forster, 1999 Forster &amp; Forster (1999) considered Nanometinae to be composed of <i>Nanometa</i>, <i>Orsiella lagenifera</i> (Urquhart, 1888) (<i>Orsiella</i> is a <i>nomen nudum</i> and currently species misplaced in <i>Orsinome</i>) and <i>Eryciniolia</i> Strand, 1912. Álvarez-Padilla &amp; Hormiga’s (2011) concept of Nanometinae included only <i>Nanometa</i>, <i>Pinkfloydia</i>, misplaced “ <i>Orsinome</i> ” <i>sarasini</i>, and a single unplaced “ Nanometinae sp.” It is unclear how Álvarez-Padilla &amp; Hormiga (2011) recognized “ <i>Nanometa</i> sp. ” or “ Nanometinae sp.” without studying the type species, <i>N. gentilis</i> Simon, 1908. The type species is known only by the verbal description of Simon (1908) from Western Australia and figures in Dalmas (1917) of the eye region and epigyne of a New Zealand specimen (WSC 2017). Dalmas (1917) studied Simon’s type and mentioned some differences between specimens from New Zealand and Australia. It is worth noting that Roewer (1942: 1013) erroneously indicated that <i>Nanometa gentilis</i> was described based on the female and known only from Western Australia, although Simon (1908) described both sexes and Dalmas (1917) reported specimens from New Zealand. These errors are repeated in Platnick (2000 –2014) and the World Spider Catalog (2017) which are based on Roewer’s incorrect data. The morphology of the copulatory organs of <i>Pinkfloydia</i>, <i>Eryciniolia</i>, and two misplaced <i>Orsinome</i> species differ considerably from <i>Nanometa</i> sensu Álvarez-Padilla &amp; Hormiga (2011) and, to our mind, cannot be considered in Nanometinae. Distinguishing species of <i>Nediphya</i> gen. n. Some species can be recognized by carapace pattern (figs 2, 4, 6–8, 12–15). All species differ by spination and shape of epigyne (see diagnoses of the individual species). Composition: <i>Nediphya lehtineni</i> sp. n. (&amp;male;, &amp;female;), <i>N. hippai</i> sp. n. (&amp;female;), <i>N. lyleae</i> sp. n., and <i>N. padillai</i> sp. n. (&amp;female;), all from Papua New Guinea. Etymology. The genus name is a combination of two letters from terra typica Papua New Guinea with <i>Diphya</i> and, in most Slavic languages, meaning “not <i>Diphya</i> ”. The gender is feminine.
description: Published as part of <i>Marusik, Y. M. &amp; Omelko, M. M., 2017, A New Genus Of Tetragnathid Spiders From Papua New Guinea (Aranei, Tetragnathidae), pp. 203-214 in Vestnik Zoologii (Vestn. Zool.) (Vestn. Zool.) 51 (3)</i> on pages 204-206, DOI: 10.1515/vzoo-2017-0027, http://zenodo.org/record/6454189
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