Phylladiorhynchus talaus Rodríguez-Flores &amp; Macpherson &amp; Machordom 2021, n. sp.
Creators: name: Rodríguez-Flores, Paula C.
name: Macpherson, Enrique
name: Machordom, Annie
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Galatheidae
Phylladiorhynchus
Phylladiorhynchus talaus

description: <i>Phylladiorhynchus talaus</i> n. sp. (Figs. 50J, 51) <b>Type material.</b> <i>Holotype.</i> Western Australia, Montilivet Island, Stn 117/K12, 14.2883°S, 125.2255°E, 0–11 m, 25 October 2012: 1 ov. F 1.9 mm (WAM C51399). <i>Paratypes.</i> Western Australia. Adele Island Stn 01/K09-adhoc, 15.5234°S, 123.2053°E, 0–20 m, 13 October 2009: 1 ov. F 2.4 mm (WAM C43997).— Stn 02/K09-adhoc, 15.5192°S, 123.1957°E, 0–14 m, 14 October 2009: 1 ov. F 1.8 mm (WAM C43826).— Ningaloo Reef. 22.7581°S, 113.6491°E, 13 m, 1 May 2009: 1 F 1.8 mm (UF 217029).— 22.6083°S 113.6249°E, 10 m, 1 May 2009: 1 M 2.1 mm (UF22293). <b>Other material</b>. Indonesia. Rumphius Exp. II. 1975, NE coast Marsegu Is., on coral. 18 January 1975: 1 M 2.7 mm (MNHN-IU-2014-23832 (Ga-1154)). Papua New Guinea. PAPUA NIUGINI Stn PB 39, 05.2650°S, 145.7850°E, 18–27 m, 6 December 2012: 1 M 2.1 mm (MNHN-IU-2019-2637).—KAVIENG Stn KB 36, 02.6466°S, 150.6400°E, 3–8 m, 13 June 2014: 1 M 2.3 mm, 1 F 2.2 mm (MNHN-IU-2014-13664).— Stn KB 58, 02.5683°S, 150.6250°E, 12 m, 22 June 2014: 1 F 2.5 mm (MNHN-IU-2016-5858).— Stn KB 60, 02.5416°S, 150.5883°E, 20 m, 23 June 2014: 1 F 1.8 mm (MNHN-IU-2016- 476). <b>Etymology.</b> From the name <i>Talaus</i>, an Argonaut, son of Bias and Pero. The name is considered a substantive in apposition. <b>Description.</b> <i>Carapace:</i> As long as or slightly longer than broad; transverse ridges with dense short setae and few scattered long and thick iridescent setae. Gastric region slightly convex with 4 transverse ridges: epigastric ridge distinct with 2 median spines and some lateral short scales; anterior protogastric ridge not medially interrupted, nearly extending laterally to carapace margin; anterior mesogastric ridge not medially interrupted, laterally continuing to first branchial spine; anterior metagastric scale-like or medially and laterally minutely interrupted, sometimes followed by short scales. Mid-transverse ridge not interrupted, medially slightly depressed, cervical groove indistinct, followed by 2 not interrupted or minutely interrupted ridges, interspersed with 2 short lateral ridges and few short scales. Lateral margins convex slightly convex, with 7 distinct spines: first anterolateral spine welldeveloped, reaching anteriorly to level of lateral orbital spine, second spine (hepatic) small, slightly dorsomesially from lateral margin, and followed by 5 branchial spines (3 anterior and 2 posterior). Rostrum leaf-like, horizontal, dorsally convex, [1.2]–1.3 × as long as broad, length [0.3]–0.4 and breadth 0.3 that of carapace; lateral margins smooth or minutely serrated and convex, with well-developed supraocular basal spines and small subapical spines (tridentiform). Pterygostomian flap with anterior spine, upper margin smooth. <i>Thoracic sternum</i>:As wide as long. Sternite 3 quadrangular, 1.5–[1.7] × as wide as long, anterior margin convex, anterolaterally rounded. Sternite 4 widely contiguous to sternite 3; anterolaterally serrated, surface depressed in midline, smooth; greatest width [2.5]–3.3 × that of sternite 3, 3.3–[3.5] × as wide as long. <i>Pleon</i>: Elevated ridges with short setae and a few scattered long setae. Tergite 2 with anterior and posterior transverse elevated ridges; tergite 3–4 with anterior transverse ridge, posterior transverse ridge absent; tergites 5–6 smooth. <i>Eye:</i> Eyestalk length about 0.9–[1.1] × broader than long, peduncle distally setose, not distinctly expanded proximally; cornea expanded distally, maximum corneal diameter [1.1]–1.2 × rostrum width, as wide as eyestalk. <i>Antennule</i>: Article 1 slightly longer than wide, with 5 distal spines: distomesial spine well-developed; proximal lateral spine small, always present. <i>Antenna:</i> Article 1 with prominent mesial process, distally falling short or overreaching lateral antennular spine. Article 2 with well-developed distomesial and distolateral spines. Articles 3 with small distomesial spine. Article 4 unarmed. <i>Mxp3:</i> Ischium with distinct distal spines on flexor and extensor margins. Merus 0.7–[0.8]× length of ischium, with well-developed distal spine on extensor and flexor margins. <i>P1</i>: 2.3 (males), [2.0]–2.5 (females) × carapace length; subcylindrical, spiny and with long stiff setae; merus, carpus and palm with spines along mesial, dorsal and lateral surfaces, distal and mesial spines usually stronger than others. Merus [0.8]0.6–0.9 length of carapace, [1.9]1.6–2.1 × as long as carpus. Carpus [1.6]1.5–1.9 × as long as wide. Palm [1.1]–1.3 × carpus length, [1.5]–2.3 × as long as broad. Fingers unarmed, 0.7–[1.1] × palm length. <i>P2–4</i> (P3 lost in holotype): Setose and spinose. Meri successively shorter posteriorly: P3 merus 0.8–0.9 × length of P2 merus, P4 merus 0.7–0.9 × length of P3 merus. P2 merus, [0.5]–0.6 × carapace length, [3.5]–4.5 × as long as broad, [1.1]–1.3 × as long as P2 propodus; P3 merus 3.5–4.0 × as long as broad, 0.9 × as long as P3 propodus; P4 merus 3.0–[3.3] × as long as broad, 0.9–[1.1] × as long as P4 propodus; extensor margin of P2 and P3 with row of spines, proximally diminishing, with prominent distal spine; P4 extensor margin irregular, unarmed; flexor margin irregular, with distal spine on P2–4. Carpi with 4 spines on extensor margin on P2–3, unarmed on P4; distal spine prominent on P2–3, absent on P4; granules below extensor margin on lateral surface of P2–4; flexor margin unarmed. Propodi stout, [4.3–4.7]5.0–5.8 × as long as broad; extensor margin irregular, armed with 3 spines; flexor margin with 3–4 slender movable spines in addition to distal pair. Dactyli [0.7–0.8]0.6–0.8 × length of propodi, ending in incurved, strong, sharp spine; flexor margin with 5–6 movable spines. <i>Eggs</i>: Ov. F carried approximately 15– 40 eggs of 0.4–0.5 mm diameter. <b>Live colour.</b> Unknown. <b>Genetic data.</b> COI and 16S, Table 1. <b>Distribution.</b> Indonesia, Marsegu Island (Seram Island), Papua New Guinea, and Western Australia, from 0 to 27 m. <b>Remarks.</b> <i>Phylladiorhynchus talaus</i> belongs to the group of species having 2 epigastric spines, 1 hepatic spine and 3 spines on anterior branchial margin. The closest species is <i>P. triginta</i> Schnabel &amp; Ahyong, 2019 from Tasman Sea and Norfolk Island, but they are easily differentiated by several characters (see the differences under the Remarks of this species). The two sequences of <i>P. talaus</i> from Western Australia and Papua New Guinea diverged by 2.3% (COI) and 0.2% (16S), respectively. The specimens of <i>P. talaus</i> range from 1.8 to 2.7 mm postorbital carapace length.
description: Published as part of <i>Rodríguez-Flores, Paula C., Macpherson, Enrique &amp; Machordom, Annie, 2021, Revision of the squat lobsters of the genus Phylladiorhynchus Baba, 1969 (Crustacea, Decapoda, Galatheidae) with the description of 41 new species, pp. 1-159 in Zootaxa 5008 (1)</i> on pages 134-136, DOI: 10.11646/zootaxa.5008.1.1, http://zenodo.org/record/5157455
description: {"references": ["Schnabel, K. E. &amp; Ahyong, S. T. (2019) The squat lobster genus Phylladiorhynchus Baba, 1969 in New Zealand and eastern Australia, with description of six new species. Zootaxa, 4688 (3), 301 - 347. https: // doi. org / 10.11646 / zootaxa. 4688.3.1"]}