Garymunida namora, Macpherson & Rodríguez-Flores & Machordom, 2024

Macpherson, Enrique, Rodriguez-Flores, Paula C. & Machordom, Annie, 2024, DNA barcoding and morphology revealed the existence of seven new species of squat lobsters in the family Munididae (Decapoda, Galatheoidea) in the southwestern Pacific, ZooKeys 1188, pp. 91-123 : 91

Garymunida namora sp. nov.

Figs 1 , 2

Garymunida sp. 2: Machordom et al. 2022: table 2, fig. 3.

Material.

Holotype: New Caledonia. Spanbios Stn CP 5155, 5 July 2021, 20°05.9'S, 163°42.6'E, 573-575 m: male, 13.9 mm (MNHN-IU-2021-9330) . Paratype: Papua New Guinea. Biopapua Stn CP 3682, 27 September 2010, 04°37.820'S, 149°27.940'E, 515-812 m: 1 female, 16.0 mm (MNHN-IU- 2011-3173) .

Description.

Carapace: Approximately as long as wide, dorsally moderately convex. Transverse ridges usually microscopically granular, mostly interrupted, with dense, very short setae, and a few scattered long non-iridescent setae. Some granular scales on hepatic and anterior branchial regions. Main transverse striae on posterior part of carapace interrupted in cardiac region. Two strong epigastric, two protogastric behind epigastric and two parahepatic spines on gastric regions. One row of four or five strong branchiocardiac spines. Posterior margin with two median spines. Upper orbital margins slightly oblique; lower orbital margins visible dorsally, laterally with minute spine, mesially with low rounded process. Lateral margins moderately convex. Anterolateral spine strong, located at carapace anterolateral angle, reaching level of sinus between rostrum and supraocular spines. Second marginal spine before cervical groove well developed. Branchial margins feebly convex, with 4 spines. Rostrum spiniform, half as long as remaining carapace, slightly sinuous and nearly horizontal in lateral view. Supraocular spines exceeding midlength of rostrum and reaching or overreaching end of cornea, divergent, directed slightly upwards. Pterygostomian region unarmed ending anteriorly in rounded tip.

Thoracic sternum: 0.6 × as wide as long. Sternite III with median shallow notch. Sternite IV with anterior part as wide than sternite III, with some short striae. Sternites IV-VI with a few striae on lateral sides. Sternite III ~ 5 × as wide as long; sternite IV nearly 2.5 × as wide as long, and 2 × as wide as sternite III.

Pleon: Tergites II and III each with four spines on anterior margin; tergite IV with two median spines on anterior ridge and median spine on posterior ridge.

Eye: Large, cornea dilated, maximum corneal diameter ~ 0.4 distance between bases of anterolateral spines.

Antennule: Article 1 (distal spines excluded), ~ 1/4 carapace length, slightly overreaching cornea, with two distal spines, mesial spine longer than lateral spine; two spines on lateral margin, proximal one small, located at midlength of segment, distal one long, not overreaching distolateral spine.

Antenna: Article 1 with one short process on mesial margin, reaching end of article 2; article 2 with two distal spines, mesial spine shorter than lateral spine, reaching midlength of article 3; article 3 with distomesial spine; article 4 unarmed.

Mxp3: Ischium ~ 2 × length of merus measured along dorsal margin, distoventrally bearing strong spine. Merus with one strong median spine on flexor margin; extensor margin unarmed.

P1: 3.0 × carapace length, with scattered long plumose setae. Merus with row of mesial spines; a few small, scattered spines on dorsal side. Carpus 5 × as long as broad; with spines along mesial margin and a few minute spines on dorsal side. Palm 7.5 × as long as broad, with a few small dorsal spines; one or two spines along mesial and lateral margins. Fingers 0.8 × palm length.

P2-P4: Long and slender, with numerous long non-plumose and non-iridescent setae along extensor margin of articles. P2 3.0 × carapace length. Meri slightly shorter posteriorly (P2 merus as long as P3 merus; P3 merus 0.9 length of P4 merus); P2 merus 1.5 × carapace length, 13.0-13.5 × as long as broad, 1.4 × longer than P2 propodus; P3 merus 12.5 × as long as broad; P4 merus 11.5 × as long as broad. Extensor and flexor margins of P2-P4 meri with row of 9-11 and 6-10 spines, respectively, proximally diminishing spines; lateral sides unarmed, more squamate in P4. P2-P4 carpi with 2-4 spines on extensor margin; lateral surface with several granules sub-paralleling extensor margin; flexor margin with distal spine. Propodi 14.5-17.0 × as long as broad; extensor margin unarmed; flexor margin with 7-9 slender movable spines, distal end without fixed spine. Dactyli slender, length 0.4 that of propodi; flexor margin with 13-17 movable spinules, proximal and distal fourth unarmed, without a spinule at the base of the unguis; P2 dactylus 8.2 × as long as wide.

Genetic data.

COI, 16S.

Etymology.

" Namora " is a mythological woman participating in the creation of New Guinea. Used as noun in apposition.

Remarks.

The closest species to the new species is G. procera (Ahyong & Poore, 2004), from New Caledonia, Queensland, New South Wales and New Zealand, G. imitata (Macpherson, 2006), from French Polynesia, and G. soelae (Baba, 1986), from Kyushu-Palau Ridge, Taiwan, Indonesia, SW Australia, and Fiji. These species have the pleomere IV tergite armed with median spine on posterior transverse ridge, the article 1 of the antennal peduncle with moderate-sized process, not reaching article 4, and a pair of protogastric spines behind median pair of epigastric spines. However, the new species differ easily from the other three species in the following characters:

The cardiac region is unarmed in the new species, whereas there are some median spines in the other three species.

The posterior ridge of the carapace has two median spines in G. namora , whereas there are six spines in the other three species.

The divergences between G. namora and the morphologically or phylogenetically closest species are ~ 14% for COI (respect to G. imitata , G. procera or G. longipes ). These values drop to 6.1-8.6% when 16S is analysed and comparisons are made respect to G. simillima , G. imitata , G. laurentae , G. procera , or G. longipes .

Distribution.

Papua-New Guinea and New Caledonia, between 515 and 812 m.

Figures

Figure 1. Garymunida namora sp. nov., male holotype, 13.9 mm (MNHN-IU- 2021 - 9330), New Caledonia A carapace and pleon, dorsal view B sternal plastron C cephalic region, showing antennular and antennal peduncles, ventral view D right Mxp 3 ischium and merus, lateral view. Scale bars: 2.0 mm (A, B); 1.0 mm (C, D).

Figure 2. Garymunida namora sp. nov., male holotype, 13.9 mm (MNHN-IU- 2021 - 9330), New Caledonia A right P 1, merus and carpus, dorsal view B right P 1, palm and fingers, dorsal view C right P 2, merus and carpus, lateral view D right P 2, propodus and dactylus, lateral view E right P 3, merus and carpus, lateral view F right P 3, propodus and dactylus, lateral view G right P 4, merus and carpus, lateral view H right P 4, propodus and dactylus, lateral view. Scale bar: 10.0 mm.