Pagurixus tweediei P
Creators: name: Komai, Tomoyuki
name: Rahayu, Dwi Listyo
name: Fujita, Yoshihisa
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Paguridae
Pagurixus
Pagurixus tweediei

description: <i>Pagurixus tweediei</i> (Forest, 1956) (Fig. 12A) <i>Eupagurus</i> (<i>Pagurixus</i>) <i>tweediei</i> Forest, 1956: 50, pl. 4 [type locality: Cocos (Keeling) Islands]. <i>Pagurus</i> (<i>Pagurixus</i>) <i>tweediei</i> – Dechancé, 1964: 38; Ball &amp; Haig, 1972: 103; Lewinsohn, 1982: 58. <i>Pagurixus tweediei</i> – Komai &amp; Osawa, 2006: 25, figs. 8–11, 44B, 47; Osawa et al., 2013: 357, fig. 2D. <b>Material examined.</b> CHRISTMAS ISLAND. QM W29572, 1 male (sl 3.4 mm), CI-D03-2010, Coconut Point, 10°24.741′S, 105°41.868′E, 27 January 2010; ZRC 2021.0640, 1 male (sl 3.6 mm; photo), CI-D05-2011, West White Cave, off West White Beach, 1–12.3 m, 10°27.733′S, 105°35.054′E, 25 March 2011; ZRC 2021.0641, 1 male (sl 2.0 mm), Thunderdome Cave, Christmas Island, 10°27.906′S, 105°36.465′E, 3–16.6 m, 30 March 2011. COCOS (KEELING) ISLANDS. ZRC 2021.0642, 1 ovigerous female (sl 3.5 mm; photo), CK18, the Rip, SW of Direction Island, 12°05.675′E, 96°53.175′E, 5.7 m, 22 March 2011. <b>Distribution.</b> Previously known with certainty from Cocos (Keeling) Islands (type locality); Japan (Ogasawara Islands and Ryukyu Islands), Mariana Islands (Guam), and French Polynesia (Society Islands) in the western Pacific Ocean; intertidal to 91.3 m (Komai &amp; Osawa, 2006; Osawa et al., 2013). Newly recorded from Christmas Island, at depths of 1–16.6 m. <b>Remarks.</b> <i>Pagurixus tweediei</i> was originally described on the basis of material from Cocos (Keeling) Islands (Forest, 1956). Komai &amp; Osawa (2006) reexamined the two syntypes, and clarified that <i>P.</i> cf. <i>tweediei</i> of McLaughlin &amp; Haig (1984) might actually represent <i>P. carinimaus</i> instead. The present specimens, including the topotypic specimen from Cocos (Keeling) Islands, differ from specimens from the Ryukyu Islands (Japan) and Society Islands (French Polynesia), referred to as <i>P. tweediei</i> by Komai &amp; Osawa (2006) and Osawa et al. (2013), in the lack of proximal and distal white rings on the propodi of the ambulatory legs (Fig. 12A versus Komai &amp; Osawa, 2006: fig. 44B; Osawa et al., 2013: fig. 2D), although they are morphologically similar to one another. In this colour pattern of the ambulatory legs, the present specimens are rather similar to <i>P. formosus</i> Komai, 2010 (cf. Osawa et al., 2013: fig. 2B, C), but seem to differ from the latter taxon in the possession of distinct spines on the dorsolateral and dorsomesial margins of the left cheliped carpus (in <i>P. formosus</i>, there are only rows of small tubercles or granules there; Komai, 2010; Osawa et al., 2013). Molecular genetic analyses would be advisable to fully clarify the status of the western Pacific populations referred to as <i>P. tweediei</i> and of <i>P. formosus</i>. Morgan (1992) recorded <i>P. tweediei</i> from Christmas and Cocos (Keeling) Islands, but his identification seems to have been based on McLaughlin &amp; Haig’s (1984) account. Komai &amp; Osawa (2006) argued that Morgan’s specimens did not represent the true <i>P. tweediei</i>, although the identity was not established.
description: Published as part of <i>Komai, Tomoyuki, Rahayu, Dwi Listyo &amp; Fujita, Yoshihisa, 2021, Hermit crabs of the family Paguridae (Crustacea: Decapoda: Anomura) from Christmas and Cocos (Keeling) Islands, Indian Ocean Territory of Australia, with descriptions of three new species and reappraisal of the genus Kumepagurus Komai &amp; Osawa, 2012, pp. 378-402 in Raffles Bulletin of Zoology 69</i> on page 398, DOI: 10.26107/RBZ-2021-0059, http://zenodo.org/record/7174998
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